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Journal articles on the topic 'Leaching kinetics'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Sequeira, César A. C. "Application of Mixed Potential Theory to Leaching of Mineral Phases." Reactions 3, no. 2 (2022): 312–28. http://dx.doi.org/10.3390/reactions3020023.

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Leaching is a central unit operation in the hydrometallurgical processing of minerals, which often occurs by means of electrochemical reactions. Application of mixed potential theory to explain the kinetics of oxidative and reductive leaching processes is a useful concept in explaining observed results. Native metals, selected oxides, and most base metal sulfides are electron-conducting phases. For these minerals, leaching may take place by normal corrosion, passivation or galvanic couple mechanisms, which provide individual electrode kinetics enabling the calculation of mixed potentials and o

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2

Mudruk, N. V., A. A. Antonov, A. I. Nikolaev, and O. V. Rybalkina. "Research on the acid decomposition kinetics of non-conventional titanium raw materials of the Arctic Zone of the Russian Federation." Arctic: Ecology and Economy 13, no. 1 (2023): 58–71. http://dx.doi.org/10.25283/2223-4594-2023-1-58-71.

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Acid leaching kinetics of loparite, perovskite, and titanite concentrates by hydrochloric and nitric acids has been studied. Kinetic parameters of acid leaching have been calculated and fitted to several kinetic models. Deeply kinetic study gives us the knowledge of acid leaching of titanium-containing minerals, and parameters obtained allow us to choose the optimal conditions of the mineral processing.

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3

Zheng, Fuqiang, Yufeng Guo, Feng Chen, et al. "Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH4+]-[F−] Solution." Metals 11, no. 8 (2021): 1176. http://dx.doi.org/10.3390/met11081176.

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The effects of F− concentration, leaching temperature, and time on the Ti leaching from Ti-bearing electric furnace slag (TEFS) by [NH4+]-[F−] solution leaching process was investigated to reveal the leaching mechanism and kinetics of titanium. The results indicated that the Ti leaching rate obviously increased with the increase of leaching temperature and F− concentration. The kinetic equation of Ti leaching was obtained, and the activation energy was 52.30 kJ/mol. The fitting results of kinetic equations and calculated values of activation energy both indicated that the leaching rate of TEFS

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4

Li, Jin, Jing Hua Pang, Cong Deng, Peng Zhao, and Shu Zhen Hou. "Kinetics on the Leaching of Polysaccharide from Arctium lappal Root." Advanced Materials Research 531 (June 2012): 334–37. http://dx.doi.org/10.4028/www.scientific.net/amr.531.334.

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To explore the kinetics parameters in the leaching of polysaccharide from Arctium lappal root. According to Fick’s second law of diffusion, the kinetic equation for polysaccharide leaching process was established with ball model. According to Fick’s second law of diffusion, leaching process was analysed. The results can provide the valuable theory basis for the technical design and further research of polysaccharide leaching process.

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5

Li, Jin, Peng Zhao, Mei Wang, Lu Wang, and Cong Deng. "Kinetics on the Leaching of Total Flavonoids from Arctium lappal Root." Advanced Materials Research 1021 (August 2014): 56–59. http://dx.doi.org/10.4028/www.scientific.net/amr.1021.56.

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To explore the kinetics parameters in the leaching of total flavonoids from Arctium lappal root. According to Fick’s second law of diffusion, the kinetic equation for total flavonoids leaching process was established with ball model. According to Fick’s second law of diffusion, leaching process was analysed. The results can provide the valuable theory basis for the technical design and further research of polysaccharide leaching process.

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6

Li, Jin, Chong Deng, Peng Zhao, Na Wang, and Lu Wang. "Kinetics on the Leaching of Polyphenol from Arctium lappal Root." Advanced Materials Research 586 (November 2012): 235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.586.235.

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The kinetics parameters in the leaching of polyphenol from Arctium lappal root was studyed in this paper. According to second Fick’s law of diffusion, the kinetic equation for polyphenol leaching process was established with ball model. The results can provide the valuable theory basis for the technical design and further research of polyphenol from Arctium lappal root leaching process.

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7

Kontsevoy, A., and S. Kontsevoi. "LEACHING KINETICS OF PLATE-SHAPED PARTICLES." SCIENTIFIC-DISCUSSION, no. 93 (October 13, 2024): 5–7. https://doi.org/10.5281/zenodo.13926612.

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The type of the leaching kinetics equation depends on the area of the process - diffusion or kinetic, the nature of the solid material and solution, and the size and shape of the particles. The authors considered the course of leaching in the kinetic region for a solid polydisperse material in the form of a square plate, while neglecting the surface of the side faces of the plate. The distribution function of the number of particles N by their size r is taken in the form N=a∙r<sup>b</sup> , where a and b are constants. This distribution was used for the mathematical justification of the value

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8

Rogozhnikov, D. A., and B. V. Kolmachikhin. "Polymetallic Ore Concentration Middlings Nitric Acid Leaching Kinetics." Solid State Phenomena 265 (September 2017): 1065–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.1065.

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The purpose of this work is the kinetic evaluation of reactions occurring during nitric acid leaching of pollymetallic sulfide middlings, for the most complete translation of copper, zinc and sulfur in solution and concentration of precious metals in residue. Methodology is pollymetallic sulfide middlings nitric acid leaching kinetics were studied using mathematical methods such as the experimental data numerical differentiation. Relevance/value is the main sulfide minerals kinetic characteristics were obtained for the studied materials, including the rate of the process, order of reaction, th

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9

Xu, Jingyuan, Shuchen Qin, Chaozhen Zheng, et al. "Study on Column Leaching Behavior of Low-Grade High Calcium and Magnesium Copper Ore." Minerals 14, no. 8 (2024): 822. http://dx.doi.org/10.3390/min14080822.

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This paper studies the process mineralogy, mechanism, and kinetics of column leaching behavior of low-grade high-calcium–magnesium copper ore. The effect of sulfuric acid concentration, leach solution spraying intensity, and material particle size on column leaching kinetics is discussed. The kinetic analysis of column leaching of copper indicates that sulfuric acid concentration has a significant impact. As sulfuric acid concentration increases, the limiting step of reaction shifts from chemical reaction control to a combination of chemical reaction and diffusion mixing control. Spraying inte

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10

Liu, Kui, and Xi Liu. "Kinetics of Atmospheric Acid Leaching of a Limonitic Laterite." Applied Mechanics and Materials 319 (May 2013): 14–18. http://dx.doi.org/10.4028/www.scientific.net/amm.319.14.

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A limonitic nickel laterite was leached by sulfuric acid at atmospheric pressure. Kinetics of leaching within the temperature range of 75-100°C was studied. The leaching kinetics followed the shrinking core model. The diffusion through the liquid film could be negligible under the agitation speed of 600rpm or above. Surface chemical reaction was the rate-controlling step. The semi-empirical kinetic equation was determined and the activation energy was 52.843kJ/mol.

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11

Li, Jinhui, Yang Yang, Yaoru Wen, et al. "Leaching Kinetics and Mechanism of Laterite with NH4Cl-HCl Solution." Minerals 10, no. 9 (2020): 754. http://dx.doi.org/10.3390/min10090754.

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Following the growing demand for Ni and Co and the dwindling supplies of sulfide nickel ore, attention has turned toward the more efficient exploitation and utilization of laterite ore. Using ammonium chloride acid solution to leach is an effective method. Our research concerned investigations on the leaching mechanism and leaching kinetics of laterite. XRD was used to demonstrate the leaching mechanism through analysis of the pattern of the leaching residue and raw ore, showing that acid concentration affects the leaching process more significantly than other factors, and that valuable metals

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12

Künkül, Asım, Abdulvahap Gülezgin, and Nizamettin Demirkiran. "Investigation of the use of ammonium acetate as an alternative lixiviant in the leaching of malachite ore." Chemical Industry and Chemical Engineering Quarterly 19, no. 1 (2013): 25–34. http://dx.doi.org/10.2298/ciceq120113039k.

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The solutions containing ammonia allow for selective leaching of the copper from a copper ore. In this study, the leaching and kinetics of malachite ore were examined using ammonium acetate solutions as an alternative lixiviant. The effects of some experimental parameters on the leaching of malachite ore were investigated. A kinetic model to represent the effects of these parameters on the leaching rate was developed. It was determined that the leaching rate increased with increasing solution concentration, temperature and stirring speed, and decreasing particle size and solid-to-liquid ratio.

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13

Targanov, I. E., M. A. Solodovnikov, and I. D. Troshkina. "Oxidative leaching of rhenium from grinding waste of rhenium-containing superalloys." Izvestiya. Non-Ferrous Metallurgy 29, no. 5 (2023): 25–33. http://dx.doi.org/10.17073/0021-3438-2023-5-25-33.

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The study investigated the feasibility of oxidative leaching rhenium in the presence of hydrochloric acid from machining waste (grinding waste) derived from products made of ZhS-32VI, a nickel-based heat-resistant alloy containing rhenium. This was achieved through agitation leaching process. The grinding waste fraction size of –0.071 mm, which accounted for the highest yield (49.2 wt.%), was utilized in the experiments. The rhenium leaching process was conducted in two variations: in the first option, grinding waste was mixed with a hydrochloric acid solution at ~100 °C, followed by the addit

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14

Shen, Biao, Xuexin Chen, and Baijun Yan. "Hydrothermal Leaching Kinetics of Vanadium from an Iron Vanadate Mineral Using Oxalic Acid." Metals 13, no. 9 (2023): 1629. http://dx.doi.org/10.3390/met13091629.

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Hydrothermal leaching vanadium using oxalic acid is a novel method reported recently to overcome the serious environmental problems caused by traditional extracting processes. In view of its promising application potential, the hydrothermal leaching kinetics of vanadium from a concentrate mainly composed of Fe3−xVxO4 mineral via oxalic acid were investigated in this study. Firstly, the effects of the temperature and concentration of oxalic acid on the leaching behavior of vanadium were studied by measuring the leaching efficiency of vanadium at various times. Then, by fitting the measured leac

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15

Yang, Liang, Chaoyang Li, Caifang Cao, Xiang Xue, Dandan Gong, and Linsheng Wan. "Kinetics of Low-Grade Scheelite Leaching with a Mixture of Sodium Phosphate and Sodium Fluoride." Metals 12, no. 10 (2022): 1759. http://dx.doi.org/10.3390/met12101759.

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The current technology of leaching low-grade scheelite with sodium hydroxide or sodium carbonate has the disadvantages of large leaching reagent dosage and low leaching efficiency of tungsten. In order to extract scheelite efficiently, the kinetics of low-grade scheelite leaching with a mixture of sodium phosphate and sodium fluoride was investigated. In this study, the effects of temperature, phosphate concentration, and fluoride ion concentration on the leaching rate of tungsten were investigated. Our results showed that the leaching rate of tungsten was greatly influenced by the temperature

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16

Xu, Hong Sheng, Chang Wei, Cun Xiong Li, Yan Song, Zhi Gan Deng, and Gang Fan. "Kinetics of Pressure Acid Leaching of Zinc from Zinc Silicate Ore." Advanced Materials Research 402 (November 2011): 266–71. http://dx.doi.org/10.4028/www.scientific.net/amr.402.266.

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The present work is concerned with the kinetic study of pressure leaching of zinc silicate ore in sulfuric acid solutions. The effects of leaching temperature, particle size, sulfuric acid concentration and agitation speed on the zinc extraction were evaluated. The results obtained show that the zinc extraction increases with increasing sulfuric acid concentration and leaching temperature. The leaching kinetics was analyzed by using a shrinking core model with diffusion control given by: 1-2/3x-(1-x)2/3=Kt, which represented well the experimental data. The apparent activation energy was determ

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17

Li, Yaohong, Shuming Wen, Jing Cao, Dandan Wu, and Yijie Wang. "Leaching Kinetics of Hemimorphite with 5-Sulfosalicylic Acid." Metals 13, no. 7 (2023): 1249. http://dx.doi.org/10.3390/met13071249.

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The kinetics of leaching zinc from hemimorphite was investigated. The factors that influence hemimorphite leaching were also evaluated, and a kinetic model was built. In addition, scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) was used to investigate the changes of surface morphology before and after leaching. By decreasing particle size and increasing temperature, 5-sulfosalicylic acid concentration, and stirring speed, the leaching rate of hemimorphite can be enhanced. The shrinkage nucleus model describes the surface chemistry of leaching. The activation energy of hem

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18

Hao, Juanjuan, Xiaolu Wang, Yishu Wang, Fu Guo, and Yufeng Wu. "Optimization, Kinetic Studies of Tin Leaching from Waste Printed Circuit Boards and Selective Tin Recovery from Its Pregnant Solution." Metals 12, no. 6 (2022): 954. http://dx.doi.org/10.3390/met12060954.

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To protect natural resources and avoid environmental pollution, an effective method is proposed to recover tin (Sn) from waste printed circuit boards (WPCBs). In order to realize the efficient recovery of Sn, it is necessary to study the effects of experimental parameters on Sn leaching and understand the leaching kinetics of leaching processes. The statistical and mathematical technique (response surface methodology (RSM)) was used to study the effects of interactions of experimental parameters on the leaching rate and optimize experimental parameters. Moreover, a comprehensive understanding

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19

Olanipekun, E. O. "Kinetics of leaching laterite." International Journal of Mineral Processing 60, no. 1 (2000): 9–14. http://dx.doi.org/10.1016/s0301-7516(99)00067-8.

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20

Ayinla, K. I., A. A. Baba, S. Girigisu, et al. "Acidic leaching of iron from Kaoje Goethite ore by hydrochloric acid: Kinetics modelling." Nigerian Journal of Technology 39, no. 3 (2020): 800–806. http://dx.doi.org/10.4314/njt.v39i3.20.

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Considering the recent focus of the Nigeria Government to grow and develop the nation’s economy through the solid minerals sector reform, this study has been devoted to the kinetics of a Nigerian goethite ore by hydrochloric acid leaching for improved iron and steel industries applications. This study was performed in three different phases. In the first phase, acidic leaching of iron from a goethite ore was examined and the influence of the operating variables including: HCl concentration, leaching temperature, stirring speed and particle sizes was examined experimentally. The optimum conditi

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21

Chen, Huiqin, Dandan Wu, and Ziang Wang. "Investigation of the Leaching Kinetics of Zinc from Smithsonite in Ammonium Citrate Solution." Metals 14, no. 5 (2024): 519. http://dx.doi.org/10.3390/met14050519.

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In this study, the response surface method is used to develop a model for analyzing and optimizing zinc leaching experiments. An investigation into the leaching kinetics of smithsonite in ammonium citrate solution is also conducted. A model of kinetics is studied in order to represent these effects. The experimental data show that an increase in the solution temperature, concentration, and stirring speed has a positive impact on the leaching rate, while an increase in the particle size has a negative impact on it. The optimal experimental conditions consist of a leaching temperature of 70 °C,

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22

Muzayanha, Soraya Ulfa, Cornelius Satria Yudha, Luthfi Mufidatul Hasanah, Linggar Tungga Gupita, Hendri Widiyandari, and Agus Purwanto. "Comparative Study of Various Kinetic Models on Leaching of NCA Cathode Material." Indonesian Journal of Chemistry 20, no. 6 (2020): 1291. http://dx.doi.org/10.22146/ijc.49412.

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The kinetics study of NCA leaching in the HCl system was proposed. Various kinetic models such as shrinking core, logarithmic rate law, and Avrami equation were used to find out the most appropriate kinetic models for this process. The effect of HCl concentrations, leaching temperatures, solid to liquid (S/L) ratio, and leaching duration were observed. The optimum conditions of NCA leaching were at HCl concentration of 4 M, temperature of 80 °C, S/L ratio of 100 g/L, and leaching time of 1 h. The result shows that shrinking core model with diffusion control process of residue layer describes w

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23

Ismail, Suhaina, Hashim Hussin, Syed Fuad Saiyid Hashim, and Norazharuddin Shah Abdullah. "Leaching and Kinetic Modeling of Malaysian Low Grade Manganese Ore in Sulfuric Acids." Advanced Materials Research 1133 (January 2016): 629–33. http://dx.doi.org/10.4028/www.scientific.net/amr.1133.629.

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The leaching process of Malaysian low grade manganese ore (LGMO) using bamboo sawdust (BSD) as reducing agent in acidic medium (H2SO4) and the dissolution kinetics of this ore was investigated. Acid concentration, reaction temperature, and BSD loading were chosen as experimental parameters through application of response surface methodology (RSM). For analysis of the kinetic data in this study, the SCM with surface chemical reaction and diffusion through product layer, the mixed control modelled and also new variant SCM were evaluated. The reaction kinetics of this leaching process was determi

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24

Raza, Nadeem, Zafar Iqbal Zafar, and Najam-ul-Haq. "An Analytical Model Approach for the Dissolution Kinetics of Magnesite Ore Using Ascorbic Acid as Leaching Agent." International Journal of Metals 2013 (June 26, 2013): 1–6. http://dx.doi.org/10.1155/2013/352496.

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Ascorbic acid was used as leaching agent to investigate the dissolution kinetics of natural magnesite ore. The effects of various reaction parameters such as acid concentration, liquid-solid ratio, particle size, stirring speed, and temperature were determined on dissolution kinetics of the magnesite ore. It was found that the dissolution rate increased with increase in acid concentration, liquid-solid ratio, stirring speed, and temperature and decrease in the particle size of the ore. The graphical and statistical methods were applied to analyze the kinetic data, and it was evaluated that the

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25

Yang, Chang-Qiao, and Su-Qin Li. "Kinetics of iron removal from quartz under ultrasound-assisted leaching." High Temperature Materials and Processes 39, no. 1 (2020): 395–404. http://dx.doi.org/10.1515/htmp-2020-0081.

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AbstractKinetics of iron removal from quartz under the ultrasound-assisted leaching was explored in this paper, and the effects of temperature, leaching time, stirring speed and ultrasonic input power on iron removal were studied. The results revealed that the reaction kinetics followed the shrinking core model and the product layer internal diffusion was the rate-determining step in the ultrasound-assisted leaching process. The activation energy of the ultrasonic-assisted leaching reaction was 27.72 kJ/mol, which was 7.28 kJ/mol higher than that of the regular method. Moreover, the kinetic eq

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26

He, Qiang, Jiang Qiu, Minglu Rao, and Yanfei Xiao. "Leaching Behaviors of Calcium and Aluminum from an Ionic Type Rare Earth Ore Using MgSO4 as Leaching Agent." Minerals 11, no. 7 (2021): 716. http://dx.doi.org/10.3390/min11070716.

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During the leaching process of ionic rare earth ore (ICREO), ion-exchangeable phase calcium (IEP-Ca) and ion-exchangeable phase aluminum (IEP-Al) are leached along with rare earth, which causes many problems in the enrichment process, such as increasing the precipitant agent consumption and rare earth loss, etc. The agitation leaching kinetics and the column leaching mass transfer process of IEP-Ca and IEP-Al were studied to understand the leaching behavior of impurity in ICREO, which provides guides for the adjustment of the leaching process and to limit the co-leaching of impurities. IEP-Ca

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27

Supriadi, Harry, Iga Trisnawati, Tri Handini, et al. "Kinetics Study of Yttrium Leaching from Zircon Tailings Using Sulfuric Acid." Indonesian Journal of Chemistry 23, no. 2 (2023): 489. http://dx.doi.org/10.22146/ijc.79966.

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From the analysis of zircon tailings using X-Ray Fluorescence (XRF), Yttrium is a rare earth element (REE) with the highest concentration compared to other REEs. The purpose of this study is to determine the best kinetic model for describing how sulfuric acid extracts Yttrium from zircon tailings. Leaching temperatures of 200, 250, and 300 °C were used to determine the kinetics. Samples were obtained at 0, 20, 40, 60, 80, 100, and 120 min for each temperature. This study discovered that the chemical reaction model's kinetics are the most closely related to those of the leaching process. The ev

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28

Sokic, M., B. Markovic, V. Matkovic, D. Zivkovic, N. Strbac, and J. Stojanovic. "Kinetics and mechanism of sphalerite leaching by sodium nitrate in sulphuric acid solution." Journal of Mining and Metallurgy, Section B: Metallurgy 48, no. 2 (2012): 185–95. http://dx.doi.org/10.2298/jmmb111130022s.

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Interest for application of hydrometallurgical processes in a processing of complex sulphide ores and concentrates has increased in recent years. Their application provides better metal recoveries and reduced emission of gaseous and toxic ageneses in the environment. The kinetics and mechanism of sphalerite leaching from complex sulphide concentrate with sulphuric acid and sodium nitrate solution at standard conditions was presented in this paper. The influences of temperature and time on the leaching degree of zinc were investigated and kinetic analysis of the process was accomplished. With t

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29

Zeng, Gui Sheng, Hui Li, Su Hua Chen, Xin Man Tu, and Wen Bin Wang. "Leaching Kinetics and Seperation of Antimony and Arsenic from Arsenic Alkali Residue." Advanced Materials Research 402 (November 2011): 57–60. http://dx.doi.org/10.4028/www.scientific.net/amr.402.57.

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The separation of antimony and arsenic and leaching kinetics of arsenic from arsenic alkali residue were investigated. The influencing factors such as solid/liquid ratio, stir speed, temperature and time on leaching of arsenic were studied. The results show that the leaching rate reaches 87.75% at the condition of solid/liquid ratio of 1:4 , stir speed of 600r/min ,temperature of 90°C and time of 60min. The leaching process was controlled by the surface chemical reaction and the kinetics of leaching arsenic followed the model of shrinking core. The activation energy was found to be 666.57kJ/mo

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30

Peng, Xuebin, Lei Shi, Tao Qu, et al. "Kinetics of Ni and Co Recovery via Oxygen-Enriched Pressure Leaching from Waste Lithium-Ion Batteries." Separations 10, no. 2 (2023): 64. http://dx.doi.org/10.3390/separations10020064.

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In the process of the comprehensive recovery and utilization of discarded lithium-ion batteries via acid leaching, a large number of NiS and CoS mixed materials are produced. To improve the metal recovery rate, the kinetics and rate-determining step of the oxygen-rich pressurized acid leaching of Ni and Co were investigated. The results showed that the leaching rates of Ni and Co were greater than 99% under the following conditions: sulfuric acid (leaching agent) concentration of 95 g/L, liquid-to-solid ratio of 6:1, leaching time of 120 min, temperature of 110 °C, stirring speed of 400 r/min,

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31

Таrganov, I. E., and I. D. Troshkina. "Kinetics of sulfuric acid leaching of nickel from grinding waste of rhenium-containing superalloys." Izvestiya Vuzov. Tsvetnaya Metallurgiya (Universities' Proceedings Non-Ferrous Metallurgy), no. 4 (August 12, 2021): 24–31. http://dx.doi.org/10.17073/0021-3438-2021-4-24-31.

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The paper studies the kinetics of sulfuric acid leaching of nickel, the main component of grinding waste of ZhS-32VI rheniumcontaining heat-resistant superalloy formed during mechanical processing of products and containing such impurities as abrasive materials, oils, ceramics and other contaminants with refractory metal concentration in a solid residue, in agitation mode. The nickel content is 60 %. In addition to nickel, grinding waste contains other metals such as rhenium, chromium, cobalt, tungsten, tantalum, molybdenum, hafnium, titanium, and aluminum. The process of nickel leaching from

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32

Picazo-Rodríguez, Nallely G., Ma de Jesus Soria-Aguilar, Antonia Martínez-Luévanos, Isaias Almaguer-Guzmán, Josue Chaidez-Félix, and Francisco Raul Carrillo-Pedroza. "Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis." Minerals 10, no. 4 (2020): 359. http://dx.doi.org/10.3390/min10040359.

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The present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted in atmospheric-pressure and low-pressure reactors, respectively. Leaching of zinc and precipitation of iron was achieved in the same stage using different reagents like Fe3+, O2, O3, and Fe2+ (which is continuously oxidized in the leaching solution by H2O2 and O2). The highest percentage of zinc extraction (96%) was obtained in pilot-scale experiments using H2SO4, Fe2+, and O2. Experimental results were compared with those of other researchers t

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33

Wang, Wankun, and Fuchun Wang. "Kinetics Study on Microwave Alkaline Roasting-Water Dissolving of Germanium from Zinc Oxide Dust." Journal of Physics: Conference Series 2860, no. 1 (2024): 012036. http://dx.doi.org/10.1088/1742-6596/2860/1/012036.

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Abstract Zinc hydrometallurgy plants produce large amounts of germanium (Ge)-containing zinc oxide (ZnO) dust during the production process. However, the present leaching percentages of Ge by the sulfuric leaching process from ZnO dust are generally lower than 60%. Thus, a novel process of microwave alkaline roasting followed by water dissolving is proposed to further improve Ge extraction from ZnO dust, and the kinetic behaviors and related theoretical models are studied. Perhaps it can be promoted Ge leaching percentages by water after microwave alkaline roasting, the dissolving reaction kin

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34

Wang, Li Sheng, Li Heng Liu, Man Duan, and Xiong Min Liu. "Solid-Liquid Extraction Kinetics of Flavonoids in Ficus microcarpa." Advanced Materials Research 396-398 (November 2011): 575–81. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.575.

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The solid-liquid extraction kinetics of flavonoids from Ficus microcarpa with ethanol was studied. The effects of temperature and concentration of ethanol on extraction kinetics were examined. It is found that the higher temperature and concentration of ethanol, the higher leaching yields. The leaching process can be described by outer diffusion control model before 60 min and the shrinking-core model between 60 min and 150 min. The leaching process kinetics equations were established, respectively.

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35

Kumar, Gaurav, Dilini Perera, Kundukulangara Pulissery Sudheer, Pangzhen Zhang, and Sushil Dhital. "Leaching of Phytochemicals from Beans during Hydration, Kinetics, and Modeling." Foods 13, no. 2 (2024): 354. http://dx.doi.org/10.3390/foods13020354.

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In the current era, there is a growing emphasis on the circular economy and the valorization of waste products. Bean processing industries generate substantial nutrient-rich waste laden with valuable phytochemicals. Understanding the leaching patterns and kinetics of major phytochemicals is key to designing better processes leading to increased sustainability. This review investigates phytochemical leaching mechanisms and kinetic modeling methods. Firstly we lay the foundation with a broad theoretical framework, and later deal with kinetic modeling approaches and promising areas for future res

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Okwuzu, Francis Tobechukwu, Chinenye Adaobi Igwegbe, Vincent Nwoye Okafor, Jonathan Ifeanyi Ugwu, and Chinazamekpere Valerie Obi. "Kinetics Study of Alumina Leaching from Ogbunike Clay Using Hydrochloric Acid." European Journal of Sustainable Development Research 6, no. 4 (2022): em0201. http://dx.doi.org/10.21601/ejosdr/12395.

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The kinetics study of alumina leaching from ogbunike clay was carried out using a solution of hydrochloric acid (HCl) for alumina dissolution. Variations in process parameters such as calcination temperature, leaching temperature, acid concentration, particle size, and solid-to-liquid ratio were considered for the leaching of alumina. The shrinking core model was used to analyze the experimental data. Alumina removal is feasible with 24.035% extractable alumina, and this can improve the economic value of ogbunike clay, which can be an alternative raw material in Nigeria’s aluminum industries.

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Wahab, Wahab, Deniyatno Deniyatno, Marthines Saranga, and Yayat Iman Supriyatna. "Kinetics Study of Leaching Ore Nickel Laterite Using Hydrochloric Acid in Atmosphere Pressure." RISET Geologi dan Pertambangan 32, no. 1 (2022): 14. http://dx.doi.org/10.14203/risetgeotam2022.v32.1163.

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Leaching of nickel laterite ore at atmospheric pressure is a leaching method that can be operated at >100⁰C temperatures in an atmospheric pressure, which is applicable to a low-grade laterite ore. This research aimed to study the effect of temperature, acid concentration, and leaching time on nickel extraction percentage and the leaching kinetics. Hydrochloric acid (HCl) was used as a leaching agent and several variables were applied, i.e., temperature (80⁰C, 90⁰C, 100⁰C), HCL concentration (5 M, 6 M, 7 M), and leaching duration (120 minutes, 150 minutes, 180 minutes) to investigate their

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38

Yang, Huifang, Aoyang Sha, Zhengyan He, et al. "Study on the Leaching Kinetics of Weathered Crust Elution-Deposited Rare Earth Ores by Hydroxypropyl Methyl Cellulose." Minerals 13, no. 9 (2023): 1156. http://dx.doi.org/10.3390/min13091156.

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In the process of the in situ leaching of weathered crust elution-deposited rare earth ores (WCE-DREOs), there are many problems in the conventional leaching agent, such as a slow leaching rate, low leaching yield and long leaching period. In order to solve the above problems, 2.0 wt% ammonium sulfate was mixed with hydroxypropyl methyl cellulose (HPMC). The effects of the HPMC concentration, temperature, pH and flow rate on the leaching kinetics of rare earth (RE) and aluminum (Al) were investigated. The results showed that when the concentration of HPMC was 0.05 wt%, the leaching equilibrium

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39

Feng, Qicheng, Shuming Wen, Yijie Wang, Wenjuan Zhao, and Jian Liu. "Dissolution Kinetics of Cerussite in Acidic Sodium Chloride Solutions." Bulletin of the Korean Chemical Society 36, no. 4 (2015): 1100–1107. http://dx.doi.org/10.1002/bkcs.10203.

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The dissolution kinetics of cerussite in acidic sodium chloride solutions was investigated with respect to experimental variables such as particle size, stirring speed, sodium chloride concentration, hydrochloric acid concentration, and reaction temperature. Results show that leaching reagent concentration and reaction temperature have significant effects on the extraction of lead, whereas particle size and stirring speed have a relatively moderate effect on the leaching rate. The dissolution process followed the kinetic law of the shrinking core model, and a corresponding mixed control model

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Ma, Hong Zhou, Yao Ning Wang, and Xin Zhe Lan. "The Contrast Study of Microwave Heating and Traditional Heating Leaching Vanadium from Stone Coal with Sulfuric Acid Solution." Advanced Materials Research 774-776 (September 2013): 660–63. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.660.

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The aim of this paper is to contrast the effect of the microwave heating and traditional heating leaching vanadium from stone coal with sulfuric acid solution, contrast the leaching rate of vanadium, kinetics of leaching vanadium and the phase change s of slag. The experiment results show that the leaching rate and leaching velocity of vanadium with microwave heating was higher greatly than traditional heating, the kinetics of leaching vanadium with two heating methods was similar and accords with unreacted core contraction model with have solid product layer model, the illite in the stone coa

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Ubaldini, Stefano. "Leaching Kinetics of Valuable Metals." Metals 11, no. 1 (2021): 173. http://dx.doi.org/10.3390/met11010173.

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Anderson, C. G. "Alkaline sulfide gold leaching kinetics." Minerals Engineering 92 (June 2016): 248–56. http://dx.doi.org/10.1016/j.mineng.2016.01.009.

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Liang, Binjun, Haixiang Hu, Bin Xiao, Zhigang Lu, Weiquan Yuan, and Zheyu Huang. "Water Leaching Kinetics of Boron from the Alkali-Activated Ludwigite Ore." Molecules 29, no. 4 (2024): 826. http://dx.doi.org/10.3390/molecules29040826.

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The primary aim of this study was to investigate the boron leaching process from alkali-activated ludwigite ore. Initially, the ore underwent activation through roasting at 1050 °C for 60 min with 20% sodium carbonate. Subsequently, the study examined the influence of leaching parameters, including temperature, time, liquid-to-solid ratio, and particle size, using the activated ore as the raw material. Additionally, water leaching characteristics of the residues and boron kinetics were analyzed. The results demonstrated that boron leaching efficiency reached 93.71% from the reduced ludwigite o

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Dos Passos, K. L. M., B. M. Viegas, E. N. Macêdo, J. A. S. Souza, and E. M. Magalhães. "MATHEMATICAL MODELING OF LEACHING PROCESS OF RED MUD IN ORDER TO OBTAIN THE KINETICS PARAMETERS." Revista de Engenharia Térmica 14, no. 2 (2015): 90. http://dx.doi.org/10.5380/reterm.v14i2.62140.

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The use of the waste of the Bayer process, red mud, is due to its chemical and mineralogical composition that shows a material rich in oxides of iron, titanium and aluminum. Some studies conducted show that this waste can be applied as a source of alternative raw material for concentration and subsequent recovery of titanium compounds from an iron leaching process, which is present in higher amounts, about 30% by weight. To obtain a greater understanding about the leaching kinetics, the information of the kinetic data of this process is very important. In this context, the main objective of th

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Yao, J. H., X. H. Li, and Y. W. Li. "Study on indium leaching from mechanically activated hard zinc residue." Journal of Mining and Metallurgy, Section B: Metallurgy 47, no. 1 (2011): 63–72. http://dx.doi.org/10.2298/jmmb1101063y.

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In this study, changes in physicochemical properties and leachability of indium from mechanically activated hard zinc residue by planetary mill were investigated. The results showed that mechanical activation increased specific surface area, reaction activity of hard zinc residue, and decreased its particle size, which had a positive effect on indium extraction from hard zinc residue in hydrochloric acid solution. Kinetics of indium leaching from unmilled and activated hard zinc residue were also investigated, respectively. It was found that temperature had an obvious effect on indium leaching

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Huang, Zulv, Tao Chen, Yang Zhou, Wenbin Xu, Hanzhi Lin, and Bo Yan. "Optimization of Oxidative Leaching for Vanadium Extraction from Low-Grade Stone Coal Using Response Surface Methodology." Processes 8, no. 12 (2020): 1534. http://dx.doi.org/10.3390/pr8121534.

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The feasibility and kinetics of vanadium (V) recovery from oxidative leaching of low-grade stone coal using MnO2 were investigated. Oxidative leaching processes (OLPs) were designed using response surface methodology (RSM) based on the central composite design (CCD) model. The results show that the order of factors that influence OLPs is leaching temperature > H2SO4 concentration > leaching time > MnO2 dosage. The interaction between leaching temperature and H2SO4 concentration on the OLP is the most significant. Vanadium leaching efficiency was 89.3% using 31% H2SO4 and 3% MnO2 at 90

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Baba, Alafara A., Oluwaseun Ajibola, Abdullah S. Ibrahim, Folahan A. Adekola, Ruth O. Sanni, and Yunusa Abdulganiyu. "Upgrading of a Nigerian Ixiolite ore to Columbite by Sulphuric acid treatment." Metallurgical and Materials Engineering 22, no. 3 (2016): 145–54. http://dx.doi.org/10.30544/213.

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A quantitative leaching of a Nigerian Ixiolite ore in sulphuric acid medium was carried out and the effect of some parameters such as acid concentration, temperature and particle size was evaluated as a function of time. The experimental results obtained showed that the Ixiolite dissolution increases with increasing acid concentration, temperature, leaching time and, decreases with particle size. With 3 mol/L H2SO4 solution, 71.14% of the ore reacted within 120 minutes at 80°C.The kinetics of dissolution of the mineral was also examined and the observed effects of the operating variables on th

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Guo, Zhanyong, Ping Guo, Guang Su, and Fachuang Li. "Study on Ultrasonically-Enhanced Sulfuric Acid Leaching of Nickel from Nickel-Containing Residue." Crystals 11, no. 7 (2021): 810. http://dx.doi.org/10.3390/cryst11070810.

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In this paper, nickel-containing residue, a typical solid waste produced in the battery production process, was used to study the cavitation characteristics of ultrasonic waves in a liquid–solid reaction. The ultrasonically-enhanced leaching technology for multicomponent and complex nickel-containing residue was studied through systematic ultrasonic-conventional comparative experiments. An ultrasonic leaching kinetics model was established which provided reliable technological guidance and basic theory for the comprehensive utilization of nickel-containing residue. In the study, it was found t

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Pavlovic, Ljubica, Zagorka Acimovic-Pavlovic, Ljubisa Andric, and Aurel Prstic. "Kinetics of gibbsite leaching in sodium hydroxide aqueous solution." Chemical Industry 56, no. 9 (2002): 381–85. http://dx.doi.org/10.2298/hemind0209381p.

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In order to study the kinetics and mechanism of the reaction, laboratory leaching was carried out with industrially produced gibbsite ?-Al(OH)3 in aqueous solutions containing an excess of sodium hydroxide. The results obtained reaction temperature, duration and base concentration varied. The basic kinetic parameters were determined from: the reaction rate constant k=8.72?107 exp (-74990/RT) and the process activation energy in the range Ea=72.5-96.81 kJ/mol.

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Korovin, Vadym, Yurii Pohorielov, Yurii Shestak, Oleksandr Valiaiev, and Jose Luis Cortina. "Kinetics of scandium recovery by TVEX-TBP from the solution formed after the salt chlorinator cake leaching." E3S Web of Conferences 168 (2020): 00050. http://dx.doi.org/10.1051/e3sconf/202016800050.

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Kinetics of scandium recovery by TVEX containing tributyl phosphate was studied from the clarified leaching solution of salt chlorinator cake. To assess the contribution of each diffusion phase, experimental data were analyzed using a graphic method. To define the contribution of chemical interaction into the scandium extraction process, recovery kinetics was quantitatively described using pseudo-first order, pseudo-second order kinetic models and Elovich equation in linearized form. It was established that recovery kinetics was most accurately described with the pseudo-second-order model.

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