Articles de revues : « Ore grinding, vertical roller mill »

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Reichert, Mathis, Carsten Gerold, Andreas Fredriksson, Göran Adolfsson et Holger Lieberwirth. « Research of iron ore grinding in a vertical-roller-mill ». Minerals Engineering 73 (mars 2015) : 109–15. http://dx.doi.org/10.1016/j.mineng.2014.07.021.

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Altun, Deniz, Carsten Gerold, Hakan Benzer, Okay Altun et Namık Aydogan. « Copper ore grinding in a mobile vertical roller mill pilot plant ». International Journal of Mineral Processing 136 (mars 2015) : 32–36. http://dx.doi.org/10.1016/j.minpro.2014.10.002.

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Rais, Wahmin, Afrizul Evendi, Adriansyah Adriansyah et Darman Dapersal Dinar. « Optimalisasi Sistem Perawatan dan Perbaikan Mesin Vertical Mill di PT. Semen Padang ». Jurnal Teknik Mesin 13, n^o 1 (15 juillet 2020) : 31–37. http://dx.doi.org/10.30630/jtm.13.1.366.

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Vertical Mill is one of the main equipment in the Indarung IV factory PT. Semen Padang. This Vertical Mill is used to grind / crush the main ingredients of making cement such as Limestone, Silica stone, Clay, and Iron sand. Milling of this material is done with the help of a tool called a Roller Tire and grinding table. So that the Tire Tire and grinding table always work as expected, the Roller Tire and grinding table must be maintained and repaired continuously and planned. Major damage that is often encountered is the occurrence of wear and tear on the Tire Roller and the grinding roller. Countermeasures by adding meat to the Tire Roller and grinding table using welding. With the maintenance and repairs are well scheduled, then we can avoid the causes of a damage from the beginning.

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Kalyagina, Nadezhda V., Ivan I. Karpukhin, Anna V. Kornilova et Igor N. Silverstov. « Capacity of roller mill for cement grinding ». RUDN Journal of Engineering Researches 21, n^o 3 (15 décembre 2020) : 181–88. http://dx.doi.org/10.22363/2312-8143-2020-21-3-181-188.

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Engineering for the cement industry is part of the heavy industry. The cement industry is the main supplier of raw materials for the production of concrete and reinforced concrete. For grinding cement, two types of mills are used - ball and roller. Recent decades have proven the great effectiveness of a vertical roller mill for grinding raw materials. Its effectiveness, combined with the implementation of drying, grinding and separation in one unit, gives it an undeniable advantage over a ball mill. This explains the significant increase in the share of roller mills in the cement mill market. The grinding process in such mills occurs due to abrasion, respectively, in the process of work wear of the rubbing parts of the mill occurs. The work evaluated the performance of a mill with smooth disk rolls. During the study, the cause of the destruction of the sectors of the mill produced by FLSmidth, operating in the Russian Federation, was identified. The study revealed the causes of the destruction of the details of the roller mill: with the simultaneous impact of the workload and the displacement of the sectors resulting from intensive wear, the total equivalent stresses exceed the value of the endurance limit under cyclic loading. Therefore, the accumulation of fatigue damage to the material, the formation and growth of cracks, which adversely affects the performance of the mill. A number of measures have been proposed to increase the operability of mills of this design.

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Li, Kun Shan, et Yang Li. « The Application of the Non-Ball Mill for Superhard Refractories ». Applied Mechanics and Materials 239-240 (décembre 2012) : 1577–80. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.1577.

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The non-ball mill is a new-type grinding equipmentthat is developed on the foundation of the successful technology of vertical shaft breaker, vertical mill, roller etc., The crushing ratio is big, especially this machine adopts the advanced technology, of which the vulnerable part made up of metal and nonmetal is the first invention in the world, the life-span of the hammerhead covered with porcelain is over ten times than the alloy ’s. it is not only suitable for hard quality supplies but also for soft quality supplies, and the performance for the soft one is even better .

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Lieberwirth, Holger, et Lisa Kühnel. « Particle Size Effects on Selectivity in Confined Bed Comminution ». Minerals 11, n^o 4 (26 mars 2021) : 342. http://dx.doi.org/10.3390/min11040342.

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Confined bed comminution in high-pressure grinding rollers (HPGRs) and vertical roller mills (VRMs) was previously used preferably for grinding comparably homogeneous materials such as coal or clinker. Meanwhile, it started to complement or even replace tumbling mills in ore beneficiation with ore and gangue particles of rather different breakage behaviors. The selectivity in the comminution of a mixture of particles with different strengths but similar particle size distribution (PSD) of the constituents in a particle bed was investigated earlier. The strength of a material is, however, also a function of particle size. Finer particles tend to be more competent than coarser ones of the same material. In industrial ore processing using confined bed comminution, this effect cannot be neglected but even be exploited to increase efficiency. This paper presents research results on this topic based on experimental investigations with model materials and with natural particles, which were stressed in a piston–die press. It appeared that the comminution result substantially depends on the material characteristics, the composition of the mixture and the PSD of the constituents. Conclusions will be drawn for the future applications of selective comminution in mineral processing.

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Kittipongvises, Suthirat. « Feasibility of Applying Clean Development Mechanism and GHGs Emission Reductions in the Gold Mining Industry : A Case of Thailand ». Environmental and Climate Technologies 15, n^o 1 (1 décembre 2015) : 34–47. http://dx.doi.org/10.1515/rtuect-2015-0004.

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Abstract There is presently overwhelming scientific consensus that global climate change is indeed occurring, and that human activities are the primary driver. An increasingly resource and carbon constrained world will continue to pose formidable challenges to major industries, including mining. Understanding the implications of climate change mitigation for the mining industry, however, remains limited. This paper presents the results of a feasibility study on the implementation of a clean development mechanism and greenhouse gases (GHGs) emission reductions in the gold mining industry. It draws upon and extends the analysis of a case study conducted on gold mining operations in Thailand. The results from the case study indicated that total GHGs emissions by company A were approximately 36,886 tons carbon dioxide equivalents (tCO2e) per annual gold production capacity that meet the eligibility criteria for small-scaled clean development mechanism (CDM) projects. The electrostatic separation process was found to release the lowest amount of GHGs, whereas comminution (i.e. crushing and grinding) generated the highest GHGs emissions. By scope, the emission from purchased electricity (scope 2) is the most significant source. Opportunities for CDM projects implementation in the gold mining sector can be found in employing energy efficiency measures. Through innovation, some technical efficiency and technological development in gold processing (i.e. high pressure grinding rolls (HPGR), vertical roller mills (VRM), gravity pre-concentration and microwave heating technologies) that have the potential to reduce energy use and also lower carbon footprint of the gold mining were further discussed. The evidence reviews found that HPGR and VRM abatement technologies have shown energy and climate benefits as electricity savings and CO2 reduction of about 8-25.93 kWh/ton ore processed and 1.8-26.66 kgCO2/ton ore processed, respectively. Implications for further research and practice were finally raised.

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Jiang, Xiao Hong, Ping Ye et Zong Kai Li. « Analysis of Grinding Roller Stress Distribution of Vertical Roller Mill ». Advanced Materials Research 936 (juin 2014) : 1862–67. http://dx.doi.org/10.4028/www.scientific.net/amr.936.1862.

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The quality of powder of non-metal materials directly relates to the force exerted on grinding roller, while the force on grinding roller relates to the thickness of the material layer. The uneven pressure distribution between the roller and material layer is caused by the drum-shaped characteristics of vertical mill grinding roller. This paper studies the pressure distribution of roller in compacted zones, established mathematical models of pressure distribution analysis, and provides a theoretical basis for improving the vertical mill production process as well as yield and quality of the powder.

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Liu, Wei Hua, Rui Ying Bai et Ji Wei Cai. « Study on Particle Characteristics of Cement by Vertical Roller Mill Finish Grinding ». Advanced Materials Research 690-693 (mai 2013) : 738–41. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.738.

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The particle characters and their physical properties of vertical roller mill finish grinding cements were studied in this paper. The difference with roller press-ball mill combined grinding products was also analysis. The results were shown that the particle size of the vertical roller mill finish grinding cements was more evenly distributed at the comparative average size. The proportion of the particles under the 3um and on 60um has fallen off a little; the average circularity and slenderness ratio were nearly same with combined grinding process, but the proportion of high circularity particle is lesser, and the particle shape were slightly inferior with the cement produced by combined grinding process; the physical properties were nearly same with the combined grinding cement except the longer setting time. So the cement produced by vertical roller mill finish grinding process is satisfied for the usability requirements.

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West, M. P. « Process Mechanics of Vertical Roller Mill Comminution Grinding ». Journal of Engineering for Industry 113, n^o 4 (1 novembre 1991) : 381–87. http://dx.doi.org/10.1115/1.2899711.

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Lee, Dong Woo, Seok Swoo Cho et Won Sik Joo. « Failure Stress Estimation of Table Liner for Vertical Roller Mill ». Key Engineering Materials 345-346 (août 2007) : 457–60. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.457.

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A roller mill is composed of several rollers, rotational table liners, hydraulic cylinders and raw materials are ground between the rollers and the table with the assistance with a shearing and compressive force. It has been reported that an unexpected fatigue failure occurred in a table liner in the course of grinding portland cement. It is subjected to the cyclic bending stress by the rollers load and the centrifugal force by the table rotation and fractures at the edge of grinding path of outer roller. It demands design life 4×107 cycles but has fatigue life 4×106 ~ 8×106 cycles. The purpose of this study is to reveal the failure mechanism of the table liner occurring in the grinding operation of roller mill and to show the structural design guidelines for reducing the fatigue failure.

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EHARA, Shoji. « On the grinding of several materials using vertical roller mill. » RESOURCES PROCESSING 36, n^o 3 (1989) : 138–42. http://dx.doi.org/10.4144/rpsj1986.36.138.

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Ye, Ping, et Shu Ye. « Establish the Load Distribution Model for Vertical Mill Grinding Roller in Width Direction ». Advanced Materials Research 936 (juin 2014) : 1868–72. http://dx.doi.org/10.4028/www.scientific.net/amr.936.1868.

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The width of the grinding rollers are far greater than the arc length of the compaction zone in the circle view direction of the roller, and the actual wear of the mill roll surface also appear in the width direction. Therefore, it is helpful for analyzing the load distribution in the width direction of the grinding rollers, to clarify the state of mill work, and understand the non-steady-state vibration of the mill.

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Cheng, Kun. « Finite Element Analysis for Rocker Arms of Vertical Roller Mill on the ANSYS Workbench ». Advanced Materials Research 230-232 (mai 2011) : 824–28. http://dx.doi.org/10.4028/www.scientific.net/amr.230-232.824.

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Based on illuminating the structure,working principle and force analysis of vertical roller mill, the finite element analysis of rocker arms is carried out on ANSYS Workbench (AWE) platform. First of all, the structure of rocker arms and grinding roll components are simplified,then the three-dimensional entity model and meshing model of vertical roller mill both are established. Secondly, the material attribute,contact type,loads and constraints of rocker arms and grinding roll components are defined,and the total deformation, equivalent stress and safety factor of rocker arms are gained after numerical calculation.Results show that the up rocker could meet basically application requirements for its uniform stress distribution.But the lower rocker cannot meet the strength requirements for its low safety factor,and it is necessary to optimize the structure for improving the safety coefficient of lower rocker.

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Saramak, Daniel, et Agnieszka Saramak. « Potential Benefits in Copper Sulphides Liberation through Application of HRC Device in Ore Comminution Circuits ». Minerals 10, n^o 9 (16 septembre 2020) : 817. http://dx.doi.org/10.3390/min10090817.

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The article presents results of investigations on a high-pressure comminution process carried out in the roller press device, aiming at potential improvement of effectiveness of downstream beneficiation operations. The major point of interest of the paper concerned an assessment of the useful mineral liberation in relation to the volume of operating pressing force in the press device. Obtained results of mineral liberation were compared to flotation effects and downstream grinding process in a ball mill. Environmental influence in terms of dust emission was also analysed. The feed material was crushed in the high-pressure roller crusher (HRC) device under four different values of pressing force (Fsp): 3.0, 3.5, 4.0 and 4.5 N/mm2. Each product then underwent the liberation analysis, together with determination the energy savings through calculation of Bond’s working index, flotation recoveries and grinding kinetics. Results of investigations showed that both the most favourable crushing results and mineral liberation level were achieved for the highest values of operational pressing force. Nevertheless, the observed effects were less than linear together with further increasing of Fsp in HRC device. However, the obtained results of investigation unambiguously showed that pressing force affects the obtained crushing results: comminution degrees and flotation recoveries were higher while the duration of downstream grinding operation and grinding energy consumption were lower.

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Meng, Ruonan, Qinglin Zhao, Miaomiao Wu, Quanming Long et Mingkai Zhou. « A Survey and Analysis on Electricity Consumption of Raw Material Mill System in China Cement Industry between 2014 and 2019 ». Sustainability 13, n^o 3 (22 janvier 2021) : 1126. http://dx.doi.org/10.3390/su13031126.

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In the whole process of cement production, the electricity consumption of a raw material mill accounts for about 24% of the total. Based on the statistics of the electricity consumption of the raw material mill system of 1005 production lines in China between 2014 and 2019, it is found that the average electricity consumption of the raw material preparation process of all clinker production lines between 2014 and 2019 was 25.2 kWh/t. The average electricity consumption of different-tonnage production lines varies with time. In comparison with high-tonnage ones, the electricity consumption of low-tonnage production lines has wider distribution. The average electricity consumption of raw material mill dropped from 30.88 kWh/t in 2014 to 16.13 kWh/t in 2019, with a drop of more than half. At present, the raw material preparation process of new drying-process cement production enterprises mainly includes middle unloading drying tube mill raw material preparation system, vertical mill raw material final grinding system, and roller press raw material final grinding system. This paper compares the characteristics of several grinding systems and summarizes their influence on the electricity consumption.

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CELEP, O., et E. Y. YAZICI. « Ultra fine grinding of silver plant tailings of refractory ore using vertical stirred media mill ». Transactions of Nonferrous Metals Society of China 23, n^o 11 (novembre 2013) : 3412–20. http://dx.doi.org/10.1016/s1003-6326(13)62882-4.

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Li, Kun Shan, et Yi Min Mo. « Rare Earth Superfine Powders Fabrication and Characterization by Novel Non-Ball Miller ». Advanced Materials Research 328-330 (septembre 2011) : 648–53. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.648.

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The non-ball mill is a new-type grinding equipment that is developed on the foundation of the successful technology of vertical shaft breaker, vertical mill, roller etc., its principle is to make the movement route of attacking the supply in the machine to be redesigned , the grain reaches to break once only through constantly accumulating energy in the grain, the crushing ratio is big, especially this machine adopt the advanced technology, the vulnerable part is made of metal and nonmetal, which make the life-span lengthens ten times than the alloy hammer’s, which is invention in the world . The average size of this machine is smaller than 1 mm, it is not only suitable for soft quality supplies but also further more superior for hard quality supplies performance.

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DMITRAK, Yuri. « THE MAIN SCIENTIFIC ACTIVITY TRENDS OF NORTH CAUCASIAN INSTITUTE OF MINING AND METALLURGY (STATE TECHNOLOGICAL UNIVERSITY) IN THE STUDY AND SOLUTION OF THE PROBLEM OF COMPLEX AND ENVIRONMENTALLY SAFE PROCESSING OF NATURAL AND TECHNOGENIC MINERAL RAW MATERIALS ». Sustainable Development of Mountain Territories 13, n^o 2 (30 juin 2021) : 304–32. http://dx.doi.org/10.21177/1998-4502-2021-13-2-304-332.

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The result of many years research of the university scientific community in the field of topical issues of complex processing of natural and man-made mineral raw materials was the creation of a scientific school “Dynamics of working bodies of machines and equipment for fine grinding of rocks” under the leadership of Professor Dmitrak Yu. V. Research results. The dynamic parameters of the grinding bodies are determined directly in the mill grinding chamber which ensure the contactless transmission of information from the grinding ball to the receiving device. A new method of materials self-grinding and the design of a vertical centrifugal mill based on it has been developed. The mill tests during the grinding waste from the production of ceramic products (the battle of insulators, crushed mullite bricks) showed high efficiency and prospects. The tests of a laboratory vibrating mill with one grinding chamber and a rotor diameter of 250 mm for grinding dolomite were carried out. The experiments have shown the possibility of creating vibrating mills for solid materials grinding. In the development of the work of I. N. Plaksin on the flotation of ores with the jet movement of products in the scheme tested by him together with employees in the conditions of the Tekeli processing plant, the modes of joint processing of ores and gold placers were developed at the NCIMM (GTU). It was established that with the unprofitable individual development of alluvial gold mining waste, a positive economic effect can be obtained through their joint processing with ore gold reserves by fine-tuning the concentrate extracted from man-made raw materials by gravitational enrichment methods at a stationary processing plant. It is proved that the addition of the gravitational technology of alluvial gold extraction by flotation methods provides an increase in annual gold production by ~38 % due to the additional extraction of “resistant” forms of gold for gravitational methods. It has been proved in laboratory conditions that the waste slag of the Copper plant of “Ltd. MMP Norilsk Nickel” can be disposed of by joint processing with the ore of current production. It is established that the technology development using metal leaching is promising for the development of Sadonsky plant deposits.

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Khopunov, Eduard A. « Energy and power factors of selective destruction of ores ». Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, n^o 1 (17 février 2020) : 79–88. http://dx.doi.org/10.21440/0536-1028-2020-1-79-88.

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The aim of the work is to assess the factors that determine the effectiveness of devices used at different stages of ore processing. The nature of the destruction at each stage is determined by different parameters, therefore, it is so important to search for information factors that allow evaluating the response of mineral raw materials to external influences at the stages of ore preparation. The research methodology is based on the analysis of energy and power factors, which can be correlated both with the loading device and with the body being destroyed. Force factors characterize the response of a material to damaging effects, for example, the limiting amount of resistance to deformation is estimated by the force at which the destruction occurred. The results of the analysis of the role of energy and power factors are given on the example of a selfgrinding mill, a centrifugal crusher, and others. The effectiveness of the self-grinding mill is determined by the ratio of energy and power parameters in the processes of ore lumps kinetic energy conversion into the energy of elastic and breaking strains of the crushable (and crushing) material. It is shown that 88 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 1. 2020 ISSN 0536-1028 the efficiency of centrifugal crushers is ensured by the high intensity of collisions of a multitude of particles, which initially possess excess kinetic energy. In devices such as a roller-press or a cone inertial crusher, the final phase of destruction is associated with volumetric deformation of the layer. This means that the final stages of destruction are completely determined by the structural and strength characteristics of the feedstock and its particle size distribution. The field of application of the presented results are technologies in which the liberation of minerals during ore destruction is considered as a process of structure transformation based on the principles of rational ore preparation. The properties of ores, energy and force factors are important informational parameters of the analysis and selection of methods of destruction during the liberation of minerals. Examples of successful and unsuccessful use of a roller press as a device for reducing the energy consumption for ore preparation are explained within the framework of ideas about the relationship between energy and power factors.

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Ghalandari, Vahab, Mohamadreza Esmaeilpour, Naser Payvar et M. Toufiq Reza. « A case study on energy and exergy analyses for an industrial-scale vertical roller mill assisted grinding in cement plant ». Advanced Powder Technology 32, n^o 2 (février 2021) : 480–91. http://dx.doi.org/10.1016/j.apt.2020.12.027.

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Vijaya Bhaskar. B , Jayalalitha. S, Vijaya Bhaskar B. ,. Jayalalitha S. « Comparison of Various Models Implemented Using Linear and Non-Linear System Identification Methods for Cement Grinding Process Using Vertical Roller Mill ». International Journal of Mechanical and Production Engineering Research and Development 8, n^o 2 (2018) : 137–48. http://dx.doi.org/10.24247/ijmperdapr201815.

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Articles de revues sur le sujet « Ore grinding, vertical roller mill »

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