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Journal articles on the topic 'Sintering of bauxite'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Abikenova, G. K., D. D. Dauletov, S. A. Tverdokhlebov, and I. S. Danchenko. "Investigation of the possibility of using depleted bauxite in alumina production at the Pavlodar aluminum plant." Kompleksnoe Ispolzovanie Mineralnogo Syra = Complex Use of Mineral Resources 333, no. 2 (2024): 80–88. http://dx.doi.org/10.31643/2025/6445.20.

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The topic of processing low-grade or low-quality bauxite is highly relevant in modern conditions due to the gradual depletion of high-quality bauxite reserves. Consequently, there is an increasing need to explore alternative sources of raw materials for aluminum production and its derivatives. Processing low-quality bauxite ores can become an effective solution, reducing dependence on limited high-quality resources and ensuring production stability in the long term. Such research has significant potential for developing technologies capable of optimizing aluminum production processes and enhan

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2

Xiao, Li Biao, Xiao Qing Hua, and Qun Hu Xue. "Effect of Calcined-Bauxite Quality and Secondary Mullitization Reaction on Firing and Properties of Ceramic Plates." Materials Science Forum 960 (June 2019): 207–13. http://dx.doi.org/10.4028/www.scientific.net/msf.960.207.

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Addition of different types of calcined bauxites to the ceramic plate formulation was performed to study effects on the firing and properties of the resulting ceramic plates. The physical and chemical characteristics, high-temperature reaction degree, thermochemical behavior, mineral composition, and microstructure of the calcined bauxites were analyzed. The results showed that lightly calcined bauxite could minimize the linear shrinkage rate. However, incomplete high-temperature secondary mullitization reaction could inhibit completion of product sintering and result in a loose microstructure

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3

Yang, Huan Ying, Yong Li, Shu Long Liu, Chang He Gao, Shu Long Ma, and Lin Jun Wang. "Sintering Characters Analysis of the Al₂O₃-86 Homogenized Bauxite." Advanced Materials Research 690-693 (May 2013): 35–39. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.35.

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The present explains sintering characters of the Al2O3-86 homogenized bauxite under wet processes homogenization, which includes classified bauxite mine, wet grinding, vacuum extrusion, sintering in tunnel kiln,etc. DSC and TG reveal an evident peak of absorption heat at 531°C, resulting from the dehydroxylation of bauxite. Green samples held at 550°C*6hrs were heated up to different temperatures, and the properties of weight loss, linear change, bulk density and apparent porosity were measured. The data show that liquid-phase emerge and sintering process goes slowly above 1100°C. At 1500°C, l

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4

Yu, Hai Yan, Xiao Lin Pan, Kai Wei Dong, Wu Zhang, and Shi Wen Bi. "The Sintering and Leaching of Low-Grade Diasporic Bauxite by the Improved Lime-Sintering Process." Advanced Materials Research 616-618 (December 2012): 1051–54. http://dx.doi.org/10.4028/www.scientific.net/amr.616-618.1051.

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An improved lime-sintering process was developed to produce alumina from low-grade diasporic bauxite in this paper. Both clinkers sintered by the real bauxite and simulated bauxite at 1350 °C when the molar ratio of CaO to Al2O3decreased to 1.4 were produced, the alumina leaching rates of which reached over 90% in sodium carbonate liquor. The main phases in the clinkers after sintering are 12CaO•7Al2O3, γ-2CaO•SiO2and 2CaO•Fe2O3. Addition of alkali can decrease the C/A ratio and get a high alumina leaching rate of clinker.

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5

Yang, Zhong Zheng, Zhen Xian Xing, Zhan Fang Gai, and Huan Qiang Liu. "Preparation of Bauxite-Based Homogenized Mullite Grogs with Bauxite and Coal Gangue." Advanced Materials Research 199-200 (February 2011): 1940–44. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.1940.

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The sintering behavior, physical properties and heat processing changes of bauxite-based homogenized grogs prepared by homogenization process and high temperature sintering using bauxite as starting material were investigated. Results show that the bauxite-based mullite can be synthesized by the method, sintering temperature with and without MgO/CeO2sintering aids are 1600°C and 1700°C separately, the mullite with apparent porosity of＜1.0% and 2.5%, bulk density of ≥2.87g•cm-3and 2.75g•cm-3, Refracteriness-Under-Load(RUL) 1600°C and 1620С; changes in the heat processing is divided into three s

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6

Chen, Jun Hong, Bin Li, Hua Sheng Zhan, Jin Dong Su, Ming Wei Yan та Xiao Ping Li. "Action Mechanism of β-Si3N4 in Bauxite Sintering". Applied Mechanics and Materials 543-547 (березень 2014): 3834–38. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.3834.

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In this paper, we added silicon nitride in the samples of common bauxite and the bauxite with high potassium and sodium oxide content, treated them at the high temperature of 1,400°Cand 1,500°C, and then conducted analysis with XRD, SEM and EDS. The results are as follows: After adding β-Si3N4 in sintered bauxite, the partial pressure of oxygen in the composite materials will be reduced, the decomposition and volatilization of compounds with high partial pressure of oxygen (such as potassium oxide and sodium oxide) will be promoted, the content of these compounds in the bauxite will be lowered

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7

Loginova, I. V., A. V. Kyrchikov, L. I. Chaikin, and Yu A. Napolskikh. "Low-temperature sintering of bauxite raw material with alkali as an alternative to the parallel Bayer sintering process." iPolytech Journal 27, no. 4 (2024): 790–99. http://dx.doi.org/10.21285/1814-3520-2023-4-790-799.

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The aim is to develop an alternative technology of bauxite raw material processing based on low-temperature sintering of bauxite with caustic alkali, as well as to solve the issue of carbon footprint control at alumina refineries in the Urals. Laboratory tests were carried out by sintering artificial bemite and hematite with chemically pure caustic alkali at temperatures of 300, 500 and 700°C and their further leaching in weakly alkaline solutions. To study the phase, chemical, and particle size distribution of red muds after leaching, various physical and chemical methods of analysis were use

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8

Fan, Wan, Dong Zou, Jingrui Xu, Xianfu Chen, Minghui Qiu, and Yiqun Fan. "Enhanced Performance of Fly Ash-Based Supports for Low-Cost Ceramic Membranes with the Addition of Bauxite." Membranes 11, no. 9 (2021): 711. http://dx.doi.org/10.3390/membranes11090711.

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Support is a necessary foundation for ceramic membranes to achieve high performance. Finding the optimum balance between high performance and low cost is still a significant challenge in the fabrication of ceramic supports. In this study, low-cost fly ash-based ceramic supports with enhanced performance were prepared by the addition of bauxite. The pore structure, mechanical strength, and shrinkage of fly ash/bauxite supports could be tuned by optimizing the bauxite content and sintering temperature. When the sintering temperature and bauxite content were controlled at 1300 °C and 40 wt%, resp

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9

An, Jian Cheng, Lin Jun Wang, and Yun Sheng Feng. "Industrial Production and Application in LCCs of Bauxite-Based Homogenized Grogs." Advanced Materials Research 287-290 (July 2011): 1079–83. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1079.

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The Bauxite-based Homogenized Grog (BHG) was industrial producted using bauxite with about 70 wt.% Al2O3 as starting materials and its properties were tested. Through comparing with high-grade bauxite clinker, the applications in LCCs of BHG and bauxite clinker were discussed. The results showed that the BHG with mullite as chief phase, with consistent components and structure and properties using middle or low grade bauxite as starting materials can been prepared industrially by homogenization process, vacuum-extrusion moulding and high-temperature sintering method. It also resulted that the

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10

Liu, Da Cheng, Shi Zhe Liu, Bin Hao, and Yue Li. "Preparation of Porous Catalyst Support with Gangue of Bauxite Tailing." Advanced Materials Research 284-286 (July 2011): 1358–61. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.1358.

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Porous catalyst support was prepared using gangue of bauxite tailing which was a solid waste material. It was found that the mass ratio of gangue of bauxite and knar clay was 4: 1. The masses of cellulose and water were individually 1 wt% and 25 wt% of the total mass of gangue of bauxite tailing and knar clay. The pore forming agent M was optimum among the selected pore forming agents. The pore forming agent M didn’t residue in support after sintering so that the support wasn’t polluted. The appropriate addition of the pore forming agent M was 4%, and the catalyst support with the porosity of

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11

Zhang, Jiguang, Li Zhang, Zhongqing Yang, Yunfei Yan, Yandong Mao, and Jicheng Bi. "Effect of bauxite additives on ash sintering characteristics during the K2CO3-catalyzed steam gasification of lignite." RSC Advances 5, no. 9 (2015): 6720–27. http://dx.doi.org/10.1039/c4ra14060e.

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12

Tam, Panias, and Vassiliadou. "Sintering Optimisation and Recovery of Aluminum and Sodium from Greek Bauxite Residue." Minerals 9, no. 10 (2019): 571. http://dx.doi.org/10.3390/min9100571.

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Bauxite residue is treated for the recovery of aluminum and sodium by sintering with the addition of soda, metallurgical coke and other reagents such as CaO, MgO and BaO. A thorough thermodynamic analysis using Factsage 7.0™ software was completed together with XRD mineralogy of sinters with different fluxes and reagents additions. Through both thermodynamic interpretation and mineralogical confirmations, it was observed that the type of desilication product in bauxite residue influences the total aluminum recovery through the sintering process and formation of sodium aluminum silicate exists

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13

Tian, Yue Chao, Xi Liu, Hui Tang, et al. "Improvement of Thermal Shock Resistance Performance of High Alumina Ceramic Filter Support." Advanced Materials Research 750-752 (August 2013): 525–28. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.525.

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Mullite-corundum multiphase ceramic materials were prepared at 1400°C for 2h with bauxite chamotte and clay clinker as raw material (size<74 μm), molded at pressure of 50 MPa. Effect of raw materials composition on sintering and themal shock resistance of composite were researched by measurements of apparent porosity, bending strength，thermal shock resistance and thermal expansion rates, and analysed by XRD and SEM. The results showed that the best weigh percentage of raw materials with better sintering and themal shock resistance are bauxite chamotte 50 wt%, clay clinker 50wt% for mullite-

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14

Mohamad Esham, Mohamad Izrin, Mohd Hafiz Dzarfan Othman, Ahmad Fauzi Ismail, Mukhlis A Rahman, Juhana Jaafar, and Nurul Jannah Ismail. "Effect of sintering temperature of bauxite hollow fiber membrane on flexural strength and water permeability." Malaysian Journal of Fundamental and Applied Sciences 15, no. 2 (2019): 190–93. http://dx.doi.org/10.11113/mjfas.v15n2.1219.

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With abundant Malaysian bauxite minerals as the selected materials, hollow fiber ceramic membrane was fabricated for efficient production of high quality water from oil field oily wastewater. Effect of sintering temperature between 1250°C and 1450°C on membrane porosity, size of membrane pore, hydrophilicity, mechanical strength and water permeation were examined and the results were analyzed to determine the most suitable hollow fiber membrane for the application. Based on obtained findings, the most suitable sintering temperature was 1350°C. The acceptable strength and morphological behavior

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15

Li, Xianjun, and Jianying Hao. "Optimization design of low-density and high-strength ceramic proppants by orthogonal experiment." Advanced Composites Letters 29 (January 1, 2020): 2633366X2095487. http://dx.doi.org/10.1177/2633366x20954875.

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This study mainly focused on an orthogonal optimization design of low-density and high-strength ceramic proppants prepared by low-grade bauxite and feldspar that met the standard requirements. The orthogonal experimental design of L25 (53) was employed to study the significance sequence of three factors, including milling time of bauxite, milling time of feldspar, and sintering temperature. The results show that the particle size of feldspar is the most important factor for the performance of the proppants. The longer the milling time of feldspar is, the finer the particle size of feldspar is,

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16

Wu, Jian Feng, Hao Cheng, Xiao Hong Xu, and Teng Fei Deng. "Effect of Sintering Aids on the Densification of Andalusite Ceramics." Advanced Materials Research 842 (November 2013): 78–82. http://dx.doi.org/10.4028/www.scientific.net/amr.842.78.

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The ceramics with large bulk density and high bending strength were fabricated via semi-dry pressing and pressureless sintering in the air. Andalusite and calcined bauxite were used as the raw materials, sintering aids such as potassium feldspar, albite, talc, spodumene and borax were added to promote the densification and decrease the sintering temperature of the samples. The best physical properties were obtained on a sample of optimal composition (the addition of sintering aid was talc) sintered at 1500 °C for 3 h, i.e. a bending strength of 138.52 MPa and bulk density of 2.61gcm-3, the sin

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17

Li, Jin Hong, Hong Wen Ma, Ling Xin Tong, and Xiao Qian Jiang. "Reaction Sintering Kinetics of Mullite Ceramics Prepared from High Aluminum Fly Ash." Materials Science Forum 654-656 (June 2010): 2010–13. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2010.

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This research presented the kinetics of mullite formation in fly ash-bauxite reactants couples. Experiment on isothermal conversion of fly ash-bauxite at 1100°C, 1300°C, 1500°C has been carried out. XRD was used to quantitatively measure the content of mullite specimens sintered at different temperatures and times. The kinetics curve of conversion ratio versus time has been drawn. The results obtained showed that the full transformation of fly ash-bauxite to mullite takes place between 1300 °C and 1500 °C. The activation energy of secondary mullite formation is deduced to be 151 kJ/mol in the

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18

Matyukhin, V. I., A. V. Matyukhina, and I. V. Plesakin. "Valuation of process efficiency of bauxite charge sintering furnace." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 10 (November 25, 2022): 21–25. http://dx.doi.org/10.17073/1683-4518-2022-10-21-25.

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PPeculiarities of change of its thermal operation using experimental data of thermal engineering studies are considered for evaluation of technological efficiency of rotary sintering furnace. It was found that the main material flows in the rotary sintering furnace are pulp consumption (47,65 %), as well as gaseous flows of air (48,90 %) and fuel combustion waste products (51,17 %) with process gases (18,01 %) and removal of physical moisture in the form of steam (12,34 %). Efficiency of solid charge components participation in the process is characterized by sinter (21,46 %), dust removal fro

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19

Chen, Fuhang, Guanghua Wen, Haoyan Yang, Ping Tang, and Zibing Hou. "Formation of nepheline in the heating process of mould fluxes and its effect on sintering behaviour." Ironmaking & Steelmaking: Processes, Products and Applications 51, no. 4 (2024): 380–93. http://dx.doi.org/10.1177/03019233241242253.

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This study explores the formation mechanism of nepheline (NaAlSiO4) in the 500–900 °C heating process of mould flux and the influence of Al-containing materials on the nepheline formation using thermogravimetric-differential scanning calorimetry, scanning electron microscope and X-ray diffraction. The results show that the formation behaviour of nepheline depends on the type of Al2O3-containing materials. At 500 °C, flint clay (Al2SiO5) forms nepheline by solid-state reaction with sodium carbonate (Na2CO3). During the solid-state reaction process, F− improves the kinetic conditions by promotin

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20

Gao, Chang He, Jia Lin Sun, Yong Li, Jun Jie Zhang, Ji Li Zhang, and Shu Long Liu. "Investigation on the Sintering Properties of Mullite Al₂O₃-70%." Advanced Materials Research 941-944 (June 2014): 2620–25. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.2620.

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This paper takes Al2O3-70% natural mullite raw bauxite ore (Referred to 70-ore) and Al2O3-70% bauxite based homogenized grogs green adobe (Referred to 70-grog), produced by Beijing Tongda Refractory Technologies Co.,Ltd.through wet homogenization and vacuum pug process, as raw materials. 70-ore and 70-grog are fired respectively at 1100°C, 1300°C, 1400°C, 1600°C for 4 hours. Research on the influence of sintering temperature on the phase compositin, microstructure and bulk density. Analysis on the phase reaction during the sintering process. The results show that: Phase distribution of 70-ore

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21

Matyukhin, V. I., A. V. Matyukhina, and I. V. Plesakin. "Improvement of sintering conversion technology of bauxite processing using solid fuel additives." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 11 (May 30, 2023): 13–16. http://dx.doi.org/10.17073/1683-4518-2022-11-13-16.

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In order to increase the technical and economic parameters of the process of sintering bauxite charges in a rotary furnace, it is the use of additives of finely divided solid fuel in them, which, without significantly deteriorating the value of the initial components, make it possible to intensify the development of internal crystal chemical transformations in the resulting specks due to changing the intensity of heat and mass exchange processes. Laboratory studies of thermal transformations in bauxite charge sinter showed that the use of solid fuel additives intensifies the development of int

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22

Wang, Li Ren, Rong Lin Wang, Yi Cui, and Jing Long Bu. "Effects of Recycling Ladle Lining Materials on Sintering Performance of Al₂O₃-SiC-C Castable for Iron Runner." Advanced Materials Research 652-654 (January 2013): 1619–23. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.1619.

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In this experiment, preparation of samples were based on original ratio of bauxite matrix Al2O3-SiC-C castable for iron runner, and partial bauxites of size 8-5 mm, 5-3 mm, 3-1 mm and 2O3-MgO-C materials from spent ladle bricks, respectively. Effects of particle size and content of the recycled materials on sintering performance of the castable were investigated. The sintering performance was analyzed by measuring apparent porosity, room temperature flexural strength, room temperature pressure strength and high temperature flexural strength. The results showed that the apparent porosity of the

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23

Hernández, María, María Herrera, Ricardo Anaya, et al. "High macroscopic neutron capture cross section ceramics based on bauxite and Gd2O3." Science of Sintering 52, no. 4 (2020): 387–403. http://dx.doi.org/10.2298/sos2004387h.

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The effect of the addition of Gadolinium oxide (Gd2O3) up to 10 wt.% in bauxite was studied and its thermal behavior compared with pure bauxite. The incorporation of Gd2O3 is of technological interest for the design of smart traceable ceramic proppants used for unconventional gas and oil well stimulation. These high macroscopic neutron capture cross section proppants are used to obtain relevant information, such as the location and height of the created hydraulic fractures, through a neutron based detection technology. The study comprised a set of thermal and sintering behavior analyses up to

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24

Kar, Manish Kumar, and Jafar Safarian. "Characteristics of Bauxite Residue–Limestone Pellets as Feedstock for Fe and Al2O3 Recovery." Processes 11, no. 1 (2023): 137. http://dx.doi.org/10.3390/pr11010137.

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Experimental research was carried out to produce pellets from bauxite residue for the further extraction of iron and alumina. Bauxite residue and limestone with three different mixture compositions were pelletized experimentally via agglomeration followed by drying and sintering at elevated temperatures. X-Ray diffraction (XRD) and scanning electron microscopy (SEM) were used for the phase and microstructural analysis, respectively. Tumble, abrasion, and breaking load tests were applied to determine the strength of the pellets. For measurement of porosity and surface area, mercury porosimetry

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25

Fang, Bin Zheng, Hui Li, Jian Wei Cao, Jian Feng Wu, Xiao hong Xu, and Xi Dong Wang. "Study and Analysis on the High Temperature Performance of Calcined Bauxite." Advanced Materials Research 960-961 (June 2014): 7–10. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.7.

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In order to further broaden the application field of calcined bauxite, using XRF and other testing technology to study and analysis on the high temperature performance of calcined bauxite in this paper. The results showed that the sintering temperature range was 1300 ~ 1650°C, the firing line shrinkage, bulk density, bending strength, heat capacity and thermal conductivity was increased gradually, the water absorption and porosity was decreased, the water absorption, volume density and flexural strength of the sample fired at 1650°C were 0.93%, 3.20 g·cm-3 and 182.23 MPa, the specific heat and

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26

Hariswijaya, Dali, and Jafar Safarian. "Studying the Sintering Behavior of H2-Reduced Bauxite Residue Pellets Using High-Temperature Thermal Analysis." Materials 18, no. 10 (2025): 2378. https://doi.org/10.3390/ma18102378.

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Treating bauxite residue as an alternative source of metals for iron and aluminum industry is an approach to promote circular economy in metal industries. Reduction of metal oxides with a H2-based process is an important step for the decarbonization of metal industry. In this study, bauxite residue (BR) pellets were prepared and were reduced with different H2-H2O gas compositions at different temperatures, which yielded with various degrees of reduction. The bauxite residue pellets were made from a mixture of bauxite residue and Ca(OH)2 powders and sintered at 1150 °C. Hydrogen reduction was c

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27

Yu-Ming, T., Z. Peng-Fei, K. Xiang-Chen, et al. "The effect of sintering temperature on the structure and properties of corundum/mullite ceramics." Science of Sintering 47, no. 3 (2015): 273–78. http://dx.doi.org/10.2298/sos1503273y.

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In this work, samples are prepared by adding secondary raw bauxite and some suitable amount pure silica. After dry pressing molding, using solid phase sintering method sinter them at 1380?C,1410?C,1440?C,1410?C,1500?C,1530?C, respectively. A performance of the material is characterized by using SEM and XRD, such as microscopic morphology, phase composition and the compressive strength, etc. Combining results of experiments, explore the mechanism of sintering temperature on the properties of ceramic materials.

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Chen, Yuxin, Baowei Li, Yu Shi, and Shunli Ouyang. "Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites." Materials 12, no. 9 (2019): 1456. http://dx.doi.org/10.3390/ma12091456.

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Fe-Al2O3 composites were prepared by pressureless sintering, using Bayan Obo iron concentrate and bauxite as the main raw materials, activated carbon was added as the reducing agent. The effects of different bauxite additions on the phase composition, microstructures, mechanical properties, and the corrosion-resistance were investigated. The results show that the average grain size of alumina decreased as the bauxite content increased. In addition, bauxite contains TiO2, CaO, and MgO, that can form a liquid phase at high temperature, causing the heat capacity of the micro-zone around the metal

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A., Basumajumdar, Basu Santanu, and Kumar Maiti Prabir. "Role of MgO additive in reaction sintering of bauxite and titania." Journal of Indian Chemical Society Vol. 81, Nov 2004 (2004): 988–90. https://doi.org/10.5281/zenodo.5833692.

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Department of Chemical Technology, Calcutta University, 92, Acharya Prafulla Chandra Road, Kolkata-700 009, India <em>E-mail </em>: a_basumajumdar@vsnl.net                <em> Fax: </em>91-33-23519755 <em>Manuscript received 23 July 2003. revised 20 May 2004, accepted 11 June 2004</em> Raw bauxite and titania with molar ratio of Al<sub>2</sub>O<sub>3</sub> : TiO<sub>2</sub> as 1.2 : 1 were wet milled with varying amount of MgO. The milled powder after drying was pressed into briquettes, which were then sintered at various temperatures from 1400 to 1

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30

Yang, Zhong Zheng, Ke Liang Li, Wen Xuan Zhao, and Yue Zhang. "Preparation of Corundum/Mullite Composites by Sintering." Applied Mechanics and Materials 84-85 (August 2011): 64–68. http://dx.doi.org/10.4028/www.scientific.net/amm.84-85.64.

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Mullite/corundum composites synthetized by sintering with bauxite as raw material was researched. The sintering temperature, main crystal phase, microstructure and fracture mode of the composites synthetized by sintering are different with change of ratio of Al2O3 and SiO2 and content of Al2O3: (1) If the ratio of Al2O3 and SiO2 and content of Al2O3 is low, sintering temperature of the composites is high, the main crystal phase is mullite, microstructure shows interlocking network structure formed by columnar mullite, the fracture mode of composites shows that mullite appears in the pulled out

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31

Manivasakan, P., V. Rajendran, P. R. Rauta, B. B. Sahu, and B. K. Panda. "Direct Synthesis of Nano Alumina from Natural Bauxite." Advanced Materials Research 67 (April 2009): 143–48. http://dx.doi.org/10.4028/www.scientific.net/amr.67.143.

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The nano alumina have been synthesised employing a novel eco-friendly route from natural bauxite ore. The synthesis of alumina powder from natural bauxite is of great interest owing to the fact that it enables mass production without the use of expensive chemical resources and processing techniques. Employing the Bayer process, synthesis of nano alumina has been made from natural bauxite followed by sol-gel route. The ultra fine alumina powder with high surface area is obtained through the digestion of gel followed by sintering. The size of the particle and its morphology was controlled by cal

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32

Kar, Manish Kumar, and Jafar Safarian. "Characteristics of Bauxite Residue–Limestone Pellets as Feedstock for Fe and Al2O3 Recovery." Processes 11, no. 1 (2023): 137. https://doi.org/10.3390/pr11010137.

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Experimental research was carried out to produce pellets from bauxite residue for the further extraction of iron and alumina. Bauxite residue and limestone with three different mixture compositions were pelletized experimentally via agglomeration followed by drying and sintering at elevated temperatures. X-Ray diffraction (XRD) and scanning electron microscopy (SEM) were used for the phase and microstructural analysis, respectively. Tumble, abrasion, and breaking load tests were applied to determine the strength of the pellets. For measurement of porosity and surface area, mercury porosimetry

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Zhunussova, A., P. Bykov, A. Zhunusov, and A. Kenzhebekova. "Research of the production of iron ore sinter from bauxite processing waste." Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 329, no. 2 (2023): 73–81. http://dx.doi.org/10.31643/2024/6445.18.

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This article presents the results of a study of the agglomeration of waste alumina ferrous sands and the use of sinter as a substitute for metal charge in steelmaking. At this time, in the process of processing bauxite, JSC "Aluminium of Kazakhstan" produces a large number of fines, which is of great interest to ferrous metallurgy. Wastes from alumina production include a variety of waste sludge, including red, gray sludge, and ferrous sands. According to the chemical composition, ferrous sands can be attributed to iron ore material with a high content of alumina. Most of these problems are el

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Gladyshev, Sergey, Symbat Dyussenova, Yerkezhan Abikak, Nazym Akhmadiyeva, Leila Imangaliyeva, and Arina Bakhshyan. "Selective Processing of the Kaolinite Fraction of High-Silicon Bauxite." Processes 12, no. 11 (2024): 2323. http://dx.doi.org/10.3390/pr12112323.

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When processing low-quality gibbsite–kaolinite bauxites, technologies that involve different methods of mechanical and chemical enrichment with the separation of a difficult-to-utilize fine kaolinite fraction for disposal are used. Before production, problems related to waste storage and disposal arise. To solve the problem of utilization, it is necessary to develop an effective technology for the selective processing of the kaolinite fraction. The efficiency of the technology will depend on the quality of pretreatment of raw materials prior to processing for Al2O3 extraction. Preliminary prep

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Zeng, Chun Yan, Zhao Hui Huang, Ming Hao Fang, and Yan Gai Liu. "Synthesis of Mullite Using Low-Grade Bauxite and Coal Gangue." Key Engineering Materials 602-603 (March 2014): 331–34. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.331.

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The total bauxite reserves of China are about 3.7 billion tons, however the principal and the first-class bauxite reserves account for only about 20%. A large number of coal gangue was accumulated on the surface of earth, which not only encroaches land but also pollutes the environment. In this study, low-grade bauxite with alumina content of 53.18 wt.% originating from Shanxi Yangquan and coal gangue with alumina content of 38.07 wt.% originating from Shanxi Datong were used to synthesize mullite materials. Bauxite and gangue were mixed by the ratio of 1 to 1. The ingredients were prepared ac

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Nan, L. I., and Wang Jun. "Sintering and composition of a powder mixture of fine Al2O3 and beta-sialon composite made from bauxite." Science of Sintering 34, no. 3 (2002): 215–21. http://dx.doi.org/10.2298/sos0203215n.

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The sintering and composition of samples made of powder mixtures consisting of fine a-AI2O3 powder and beta-Sialon composite powder which was made from bauxite by carbonthermal reduction and nitridation were studied. The proportion of fine a-AI2O3 to beta'-Sialon composite powder in the powder mixture and soaking time give influences on porosity and relative density of the samples sintered at 1600eC. AI2O3, 15R and MgO which was added in 2 wt.% to improve sintering of the sample disappeared in the samples made of single P'-Sialon composite powder. They solubilize into beta-Sialon. In the sampl

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Wang, Li Ren, Rong Lin Wang, Dong Mei Zhao, Yi Cui, and Jing Long Bu. "Research on Appropriate Additives of Recycling Ladle Lining Materials for Al₂O₃-SiC-C Iron Runner Castable." Advanced Materials Research 750-752 (August 2013): 1184–87. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.1184.

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In this experiment, preparation of samples were based on original ratio of bauxite matrix Al2O3-SiC-C castable for iron runner, and partial bauxites of size 8-5 mm, 5-3 mm, 3-0 mm and <0.074 mm were replaced by the same size granular recycling Al2O3-MgO-C materials from spent ladle bricks, respectively. Si3N4 and B4C were introduced as appropriate additives. Effects of their amount on the performance of Al2O3-SiC-C castable for iron runner were investigated by testing on physical properties and erosion resistance of the samples after sintering. The results showed that the introduction of Si

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Shoppert, Andrei, Irina Loginova, Denis Rogozhnikov, Kirill Karimov, and Leonid Chaikin. "Increased As Adsorption on Maghemite-Containing Red Mud Prepared by the Alkali Fusion-Leaching Method." Minerals 9, no. 1 (2019): 60. http://dx.doi.org/10.3390/min9010060.

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This study investigates the use of red muds as adsorbents for As (V) removal. Red mud is a waste that contains a large amount of iron oxides and hydroxides, which are excellent adsorbents of arsenic, especially those possessing magnetic properties and a large specific surface area. The purpose of the experiments was to study the possibility of obtaining an effective adsorbent by the direct extraction of alumina from bauxite using the caustic alkali fusion method and to compare the arsenic removal effectiveness and other properties of these red muds with industrial samples. Red muds were descri

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A., Basumajumdar, Chandra Jana Dulal, and Kumar Maiti Prabir. "Effect of ZrO2 additive in reaction sintering of bauxite and titania." Journal of India Chemical Society Vol 81, Jun 2004 (2004): 528–30. https://doi.org/10.5281/zenodo.5833566.

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Department of Chemical Technology, Calcutta University 92, Acharya Prafulla Chandra Road, Kolkata-700 009, India <em>E-mail </em>: a_basumajumdar@yahoo.co.in      <em>Fax</em> : 91-33-23519755 <em>Manuscript received 4 July 2003. revised 20 November 2003. accepted 14 January 2004</em> Raw bauxite and titania with molar ratio of Al<sub>2</sub>O<sub>3</sub> : AI<sub>2</sub>O<sub>3</sub> as 1 : 1 were wet milled with varying amount of ZrO<sub>2</sub>. The milled powder, after drying, was pressed into compacts, which were then sintered at various temperatures from 1400<sup>o</sup>&n

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Wang, Kaiyue, Huijun Wang, Yi Zhou, et al. "Preparation and characterization of low-cost high-performance mullite-quartz ceramic proppants for coal bed methane wells." Science and Engineering of Composite Materials 25, no. 5 (2018): 957–61. http://dx.doi.org/10.1515/secm-2017-0142.

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AbstractIn this study, the mullite-quartz-based proppants were successfully prepared by using the coal gangue as the raw materials. Then, the effects of the additive and the sintering temperature on the composition, microstructure, and properties of the proppants were investigated. Results showed that the proppants sintered at 1250°C with the 10 wt% bauxite additive presented the best performance, which was very close to that of the quartz-proppant, and met the operational requirements of the 52 MPa coal bed methane wells. The viscous flow mechanism of the liquid phase formed during the sinter

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Gao, Chang-he, Peng Jiang, Yong Li, Jia-lin Sun, Jun-jie Zhang, and Huan-ying Yang. "One step sintering of homogenized bauxite raw material and kinetic study." International Journal of Minerals, Metallurgy, and Materials 23, no. 10 (2016): 1231–38. http://dx.doi.org/10.1007/s12613-016-1343-8.

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A., Basumajumdar, Nandi Aparna, Kumar Maiti Prabir, and Gangopadhyay Ananya. "Effect of SiC additive in reaction sintering of bauxite and titania." Journal of Indian Chemical Society Vol. 80, Mar 2003 (2003): 166–68. https://doi.org/10.5281/zenodo.5837617.

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Department of Chemical Technology, University of Calcutta, 92, Acharya Prafulla Chandra Road Kolkata-700 009, India <em>E-mail :</em> a_basumajumdar@yahoo.co.in Fax: 91-033-23519755 <em>Manuscript received 26 June 2002, revised 15 December 2002, accepted 12 December 2002</em> Raw bauxite and titania with molar ratio of Al<sub>2</sub>O<sub>3</sub> : TiO<sub>2</sub> as 1.2 : 1 were mixed with varying amounts of SiC. The compacted powder was sintered at different temperatures in the range 1400-1500°. Magnitude of sintering and properties of the sintered compacted mass were found to be in

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Gralik, G., A. L. Chinelattot, and A. S. A. Chinelatto. "Effect of different sources of alumina on the microstructure and mechanical properties of the triaxial porcelain." Cerâmica 60, no. 356 (2014): 471–81. http://dx.doi.org/10.1590/s0366-69132014000400004.

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Porcelains composed of kaolin-quartz-feldspar are called triaxial porcelains. The use of alumina as a substitute for quartz in porcelains has been developed for some time. The results show a significant improvement in their mechanical properties, but alumina has a high cost. The possibility of using alternative materials as a source of alumina with lower cost was investigated. In this work, alternative raw materials were used as a source of alumina: refractory bauxite, primary aluminum hydroxide, reprecipitated aluminum hydroxide. Compositions with commercial alumina and quartz were also formu

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Rai, Suchita, KL Wasewar, and A. Agnihotri. "Treatment of alumina refinery waste (red mud) through neutralization techniques: A review." Waste Management & Research: The Journal for a Sustainable Circular Economy 35, no. 6 (2017): 563–80. http://dx.doi.org/10.1177/0734242x17696147.

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In the Bayer process of extraction of alumina from bauxite, the insoluble product generated after bauxite digestion with sodium hydroxide at elevated temperature and pressure is known as ‘red mud’ or ‘bauxite residue’. This alumina refinery waste is highly alkaline in nature with a pH of 10.5–12.5 and is conventionally disposed of in mostly clay-lined land-based impoundments. The alkaline constituents in the red mud impose severe and alarming environmental problems, such as soil and air pollution. Keeping in view sustainable re-vegetation and residue management, neutralization/treatment of red

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Li, Ping, Xing Yong Gu, Ting Luo, and Yun Xia Chen. "Effect of Different Sintering Temperature on the Performance of Mullite-Corundum Refractory Materials." Advanced Materials Research 750-752 (August 2013): 521–24. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.521.

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Al (OH)3, Suzhou kaolin, AlF3 and V2O5 were premixed and pelleted to form the precursor for fabricating the mullite whisker, and then the precursor was added into the calcined bauxite and Suzhou kaolin mixture according to a certain mass percent. The mullite-corundum refractory materials with well-dispersed needle-like mullite formed in-situ were prepared. Through studying the effect of different sintering temperatures on the performances of the as-fabricated mullite-corundum refractory materials, it was concluded that the appropriate sintering temperature was 1450 °C. X-ray diffraction (XRD),

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Sun, Yue, Aifang Pan, Yuzhao Ma, and Jie Chang. "Extraction of alumina and silica from high-silica bauxite by sintering with sodium carbonate followed by two-step leaching with water and sulfuric acid." RSC Advances 13, no. 33 (2023): 23254–66. http://dx.doi.org/10.1039/d3ra03362g.

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Alkan, Gözde, Peter Mechnich, and Johannes Pernpeintner. "Improved Performance of Ceramic Solar Absorber Particles Coated with Black Oxide Pigment Deposited by Resonant Acoustic Mixing and Reaction Sintering." Coatings 12, no. 6 (2022): 757. http://dx.doi.org/10.3390/coatings12060757.

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Spherical particles based on bauxite-type raw materials, commonly referred to as proppants, are state-of-the-art for particle receivers of concentrated solar power plants. Particles are heated in a fluidized reactor by focused sunlight and are transported to a heat-exchanger or a storage tank. Therefore, key properties for absorber particles are high solar absorptance and mechanical endurance. Due to their relatively poor content of color-giving transition-metal cations, bauxite-derived proppants show limited solar absorptance, which is even deteriorating by long-term heat exposure. A deep-bla

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Kar, Manish Kumar, Ahmad Hassanzadeh, Casper van der Eijk, and Jafar Safarian. "Comparative Study of Hydrogen Reduction of Bauxite Residue-Calcium Sintered and Self-Hardened Pellets Followed by Magnetic Separation for Iron Recovery." Mining, Metallurgy & Exploration 40, no. 6 (2023): 2037–50. https://doi.org/10.1007/s42461-023-00882-3.

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To minimize the carbon footprint in the industrial valourization of bauxite residue, hydrogen was used as a reducing agent. The current study experimentally investigated hydrogen reduction of bauxite residue-CaO sintered and self-hardened pellets at 1000 °C, along with magnetic separation of these reduced pellets for iron recovery. Calcium was introduced to bauxite residue to form leachable calcium aluminate phases with the existing alumina in bauxite residue. This involved the addition of either CaCO3 or a mixture of CaO and CaCO3 while maintaining the fixed Ca content during pelletizatio

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Wang, Qi, Minghao Fang, Xin Min, et al. "Preparation and Performance of Ferric-Rich Bauxite-Tailing-Based Thermal Storage Ceramics." Materials 16, no. 21 (2023): 6900. http://dx.doi.org/10.3390/ma16216900.

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In recent years, regenerative thermal oxidizer (RTO) has been widely used in the petroleum industry, chemical industry, etc. The massive storage required by solid waste has become a serious problem. Due to their chemical composition, bauxite tailings as raw materials for high-temperature thermal storage ceramics show enormous potential in the fields of research and application. In this study, we propose a method for preparing ferric-rich and high specific storage capacity by adding Fe2O3 powder to bauxite tailings. Based on a 7:3 mass ratio of bauxite tailings to lepidolite, Fe2O3 powder with

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Vakalova, T. V., N. P. Sergeev, D. T. Tolegenov, D. Zh Tolegenova, and N. A. Mitina. "Red mud in high-strength ceramics production." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture 26, no. 2 (2024): 171–84. http://dx.doi.org/10.31675/1607-1859-2024-26-2-171-184.

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The work is devoted to the creation of high-strength ceramic materials with technogenic waste fillers.Purpose: Investigation of the ceramic and composite production based on chemical and metallurgical wastes to create new types of high quality constructional ceramics.Methodology/approach: The use of refractory clay with the addition of high-iron bauxite sludge as the main raw material. Bauxite sludge functions in compositions with aluminosilicate raw materials at burning at 1100 to 1200 °С, reduce to sintering due to its melting at 1150 °С.Research findings: Refractory clay compositions with r

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