International Journal of Mineral Processing最新文献_第4页

Strategies for control of parallel gravitational coal separation processes 平行重力选煤过程控制策略

International Journal of Mineral Processing Pub Date : 2017-11-10 DOI: 10.1016/j.minpro.2017.09.011

S. Cierpisz

{"title":"Strategies for control of parallel gravitational coal separation processes","authors":"S. Cierpisz","doi":"10.1016/j.minpro.2017.09.011","DOIUrl":"10.1016/j.minpro.2017.09.011","url":null,"abstract":"<div>The paper presents strategies for control of parallel gravitational coal separation processes in dense media vessels and jigs. These strategies are designed to maximize the yield of the final product at the desired ash content. The principle of circuits operating in parallel at equal incremental ash contents has been discussed from the point of view of its practical application. In the case of an ideal separation process this principle can be reduced to the requirement of equal separation densities for parallel circuits; so far, however, it has not been applied in real industrial processes. The paper includes a discussion on the concept of a separation density and incremental ash for computer simulation of parallel processes and their control. Conclusions from this discussion, presented in the paper are not available in open literature especially as regards the optimal control of jigs operating in parallel: (a) the separation density (elementary ash) defined as the density of the feed fraction reporting in half to the concentrate and in half to refuse and incremental ash (density of the elementary mass of material recovered in a process in which the yield is increased by an infinitesimally small amount) can be used for real time control in dense media baths and in jigs; (b) the autogenous separation process in jigs makes it possible to determine the incremental ash as the ash content in the separation layer of the material as measured by the correlation between ash content and the density of the separation layer. The concept of a new control system which may be used in practice, based on a radiometric density meter with a properly collimated radiation beam and located at the level of the separation layer has been discussed. The radiometric density meters, applied to monitor the density of the separation layer in jigs on-line and to monitor the density of heavy media in dense media baths can be used effectively in real-time control systems optimizing the yield of product.</div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"168 ","pages":"Pages 68-75"},"PeriodicalIF":0.0,"publicationDate":"2017-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.09.011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44258436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Processing of chalcopyrite ore by heap leaching and flotation 黄铜矿堆浸浮选工艺研究

International Journal of Mineral Processing Pub Date : 2017-11-10 DOI: 10.1016/j.minpro.2017.09.009

Hector M. Lizama

{"title":"Processing of chalcopyrite ore by heap leaching and flotation","authors":"Hector M. Lizama","doi":"10.1016/j.minpro.2017.09.009","DOIUrl":"10.1016/j.minpro.2017.09.009","url":null,"abstract":"<div>This study explored the processing of chalcopyrite ore through heap leaching followed by flotation. Crushed and agglomerated chalcopyrite ore was subjected to bacterially-assisted leaching at ambient temperature in columns that ranged in height from 1    <!-->months. Chalcopyrite leaching was affected only by time, not irrigation rate, acid delivery rate, or column height. This indicated that chalcopyrite heap leaching was reaction-limited rather than transport-limited, and therefore relatively impervious to scale. The findings suggest that chalcopyrite could be leached in substantially taller heaps, releasing proportionally greater quantities of copper, without sacrificing recovery. Leaching of the chalcopyrite ore had little effect on its floatability, as indicated by rougher flotation testing. The maximum flotation recoveries, RMAX, were 90% and 88% for the ore and leached residues, respectively. The combined leach/float recoveries were greater than the individual copper recoveries from leaching and flotation alone. This was simply due to the initial leaching step recovering some of the copper that would have been inevitably lost to flotation tailings. Such a leach/float approach may actually benefit from the low reactivity of chalcopyrite, which ensures that leaching would never be so extensive as to affect the later floatability of the mineral.</div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"168 ","pages":"Pages 55-67"},"PeriodicalIF":0.0,"publicationDate":"2017-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.09.009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48167237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Leaching of yttrium from cathode ray tube fluorescent powder: Kinetic study and empirical models 阴极射线管荧光粉中钇的浸出:动力学研究和经验模型

International Journal of Mineral Processing Pub Date : 2017-11-10 DOI: 10.1016/j.minpro.2017.09.015

Valentina Innocenzi, Ida De Michelis, Francesco Ferella, Francesco Vegliò

{"title":"Leaching of yttrium from cathode ray tube fluorescent powder: Kinetic study and empirical models","authors":"Valentina Innocenzi, Ida De Michelis, Francesco Ferella, Francesco Vegliò","doi":"10.1016/j.minpro.2017.09.015","DOIUrl":"10.1016/j.minpro.2017.09.015","url":null,"abstract":"<div>In this paper, leaching kinetics of yttrium from cathode ray tubes in sulphuric acid and hydrogen peroxide solution was investigated. It was found that hydrogen peroxide concentration, followed by temperature, has the greatest influence on leaching rate. Leaching rate is clearly enhanced by the increase in H2O2 concentration. The leaching process without hydrogen peroxide follows the kinetic model controlled by the chemical regime, whereas in presence of H2O2 it follows the kinetic model controlled by diffusion through the product layer. The apparent activation energy was determined to be 40.0kJ/mol and 90.3kJ/mol with and without hydrogen peroxide in solution, respectively. Moreover, the experimental data were used to describe empirical mathematical models in order to predict the yttrium extraction as a function of sulphuric acid concentration, hydrogen peroxide concentration, temperature and time. From the analysis of the results and models, the optimal conditions to maximize the extraction of yttrium were inferred: 40°C, 10%vol hydrogen peroxide, 15min of reaction with 15%wt/vol pulp density, or alternatively at higher temperature (80°C) 15%wt/vol pulp density, 120–180min with 0% or 5%vol hydrogen peroxide in solution. Hence, yttrium is easily leached from CRTs powder at low temperature (40°C) with higher concentration of hydrogen peroxide, or by means of higher temperature (80°C) and lower concentration, even null, of hydrogen peroxide.</div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"168 ","pages":"Pages 76-86"},"PeriodicalIF":0.0,"publicationDate":"2017-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.09.015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48787672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Effect of typical impurities for the formation of floating slimes in copper electrorefining 铜电精炼中典型杂质对浮泥形成的影响

International Journal of Mineral Processing Pub Date : 2017-11-10 DOI: 10.1016/j.minpro.2017.09.016

Shila Jafari , Mikko Kiviluoma , Taina Kalliomäki , Elisabeth Klindtworth , Arif Tirto Aji , Jari Aromaa , Benjamin P. Wilson , Mari Lundström

{"title":"Effect of typical impurities for the formation of floating slimes in copper electrorefining","authors":"Shila Jafari , Mikko Kiviluoma , Taina Kalliomäki , Elisabeth Klindtworth , Arif Tirto Aji , Jari Aromaa , Benjamin P. Wilson , Mari Lundström","doi":"10.1016/j.minpro.2017.09.016","DOIUrl":"10.1016/j.minpro.2017.09.016","url":null,"abstract":"<div>In electrorefining, Group 15 impurities arsenic, antimony and bismuth, may precipitate within the bulk electrolyte as floating slimes and contaminate the copper cathodes. In order to determine the impurity specific thresholds related to the formation of suspended solids, synthetic copper electrorefining electrolytes with different concentrations of arsenic, antimony and bismuth were investigated by a continuous filtration method. The amount and composition of the floating slimes obtained were evaluated in terms of the initial impurity concentrations present in the synthetic electrolyte. As a result, the specific influence of arsenic, antimony and bismuth on the floating slime formation was ascertained. The results suggest that there is an upper limit in electrorefining electrolytes for antimony (Sb) of 800μm and predicted composition of BiAsO4, SbAsO4, Sb2O3 and Bi2O3.</div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"168 ","pages":"Pages 109-115"},"PeriodicalIF":0.0,"publicationDate":"2017-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.09.016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45188290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Non-polar oil assisted DDA flotation of quartz I: Interfacial interaction between dodecane oil drop and mineral particle 非极性油辅助石英DDA浮选ⅰ:十二烷油滴与矿物颗粒的界面相互作用

International Journal of Mineral Processing Pub Date : 2017-11-10 DOI: 10.1016/j.minpro.2017.09.004

An Liu , Min-qiang Fan , Zhi-hong Li , Jin-chuan Fan

{"title":"Non-polar oil assisted DDA flotation of quartz I: Interfacial interaction between dodecane oil drop and mineral particle","authors":"An Liu , Min-qiang Fan , Zhi-hong Li , Jin-chuan Fan","doi":"10.1016/j.minpro.2017.09.004","DOIUrl":"10.1016/j.minpro.2017.09.004","url":null,"abstract":"<div>In this paper, in order to study the interaction mechanism of non-polar oil assisted dodecylamine (DDA) flotation of quartz, the particle-oil drops system were treated the same as the hydrophobic particles system. Pure dodecane was chosen as research object, the interfacial interactions between quartz particle and oil drop were investigated through calculation of the extended Derjaguin-Landau-Verwey-Overbeek (EDLVO) potential energy profile. Based on the calculations of the van der Waals attractive interaction potential, hydrophobic interaction potential, hydrocarbon chain association potential, and electrostatic interaction potential, the results indicated that the mineral particle and oil drop attachment state was mainly dominated by hydrophobic interaction potential. In the modification of oil agglomeration flotation process, the adsorption of DDA on the dodecane/water interface presented significant effects on the interfacial interactions between quartz particle and oil drop. It was found that the adsorption of DDA at dodecane/water interface changed the zeta potential value of oil drop from negative to positive. In this case, the attachment of the particles would occur spontaneously, which was due to the contribution of electric double layer attractive interaction. On the contrary, in the traditional oil agglomeration flotation process, a mechanical agitation was required to overcome a potential barrier due to the existence of electric double layer repulsive interaction between the negatively charged oil drops and mineral particles. This study was focus on the theoretical level, and provided some insights into mechanism of oil agglomeration flotation.</div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"168 ","pages":"Pages 1-8"},"PeriodicalIF":0.0,"publicationDate":"2017-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.09.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44858715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Beneficiation of an iron ore fines by magnetization roasting and magnetic separation 某铁矿细粒磁化焙烧—磁选工艺研究

International Journal of Mineral Processing Pub Date : 2017-11-10 DOI: 10.1016/j.minpro.2017.09.012

Jianwen Yu , Yuexin Han , Yanjun Li, Peng Gao

{"title":"Beneficiation of an iron ore fines by magnetization roasting and magnetic separation","authors":"Jianwen Yu , Yuexin Han , Yanjun Li, Peng Gao","doi":"10.1016/j.minpro.2017.09.012","DOIUrl":"10.1016/j.minpro.2017.09.012","url":null,"abstract":"<div>The utilization of abundant low-grade iron ores is potentially important to many countries in the word, especially to China. These iron ores contain many detrimental impurities and are difficult to upgrade to make suitable concentrates for the blast furnace. In this paper, the beneficiation of a low-grade hematite ore fines containing carbonates with magnetization roasting and magnetic separation was proposed and studied. The hematite and siderite are almost completely converted into magnetite by 8    wt% iron with an iron recovery of 92.7% was achieved. Meanwhile, the effects of roasting temperature, reaction time and coal to ore ratio on the magnetic properties of roasted materials were investigated using a vibration sample magnetometer (VSM). The results show that the magnetic susceptibility and magnetism saturation of hematite ore can be highly increased due to the selective conversion of hematite and siderite into magnetite caused by magnetization roasting which facilitates their separation from non-magnetic minerals.</div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"168 ","pages":"Pages 102-108"},"PeriodicalIF":0.0,"publicationDate":"2017-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.09.012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43286064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 82

Coal pyrite microwave magnetic strengthening and electromagnetic response in magnetic separation desulfurization process 煤黄铁矿微波磁强化及磁选脱硫过程中的电磁响应

International Journal of Mineral Processing Pub Date : 2017-11-10 DOI: 10.1016/j.minpro.2017.10.004

Bo Zhang, Guanghui Yan, Yuemin Zhao, Chenyang Zhou, Yao Lu

{"title":"Coal pyrite microwave magnetic strengthening and electromagnetic response in magnetic separation desulfurization process","authors":"Bo Zhang, Guanghui Yan, Yuemin Zhao, Chenyang Zhou, Yao Lu","doi":"10.1016/j.minpro.2017.10.004","DOIUrl":"10.1016/j.minpro.2017.10.004","url":null,"abstract":"<div>Coal desulfurization is imperative to creating clean coal and reducing harmful emissions during the burning process. Due to the lack of effective technology in the field of fine coal dry separation, a novel microwave-enhanced magnetic property processing method was demonstrated in this manuscript. Using representative simulated minerals, the response and absorption characteristics of coal pyrite were intuitively demonstrated while analyzing the selective absorption mechanisms of different minerals in fine coal. Results show that the coal pyrites from Inner Mongolia were reduced by approximately 20% after 60  s. The binding energy and chemical shift were quite large when the oxidation state was high. Fe2+ and troilite FeS were oxidized to Fe2O3 after 60s microwave treatment, and to Fe3+ after 90s. Dynamic equilibrium was reached after 3<!--> min of microwave treatment. The conversion rate was lower for pyrite to pyrrhotite than for pyrrhotite to troilite. The conversion of pyrrhotite to troilite appeared to be sensitive to the amount of microwave treatment. The specific susceptibility dropped rapidly and was nearly an order of magnitude greater than the raw coal. This study indicates a high possibility for coal desulfurization through this dry method enhanced with microwave energy.</div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"168 ","pages":"Pages 136-142"},"PeriodicalIF":0.0,"publicationDate":"2017-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.10.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44226879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Removal of U(VI) and Th(IV) from aqueous solutions by organically modified diatomaceous earth: Evaluation of equilibrium, kinetic and thermodynamic data 有机改性硅藻土从水溶液中去除U(VI)和Th(IV):平衡、动力学和热力学数据的评价

International Journal of Mineral Processing Pub Date : 2017-11-10 DOI: 10.1016/j.minpro.2017.08.007

Slam I.Y. Salameh , Fawwaz I. Khalili , Ammar H. Al-Dujaili

引用次数: 38

Flotation separation of diaspore from aluminosilicates using commercial oleic acids of different iodine values 不同碘值的商用油酸浮选分离一水硬石和铝硅酸盐

International Journal of Mineral Processing Pub Date : 2017-11-10 DOI: 10.1016/j.minpro.2017.09.013

Yuhua Wang, Yunwei Feng, Qian Zhang, Dongfang Lu, Yuehua Hu

{"title":"Flotation separation of diaspore from aluminosilicates using commercial oleic acids of different iodine values","authors":"Yuhua Wang, Yunwei Feng, Qian Zhang, Dongfang Lu, Yuehua Hu","doi":"10.1016/j.minpro.2017.09.013","DOIUrl":"10.1016/j.minpro.2017.09.013","url":null,"abstract":"<div>A systematic study of diasporic bauxite flotation using commercial oleic acids with different iodine values as collector was conducted in this paper. Bench scale flotation tests for diasporic bauxite ore and micro-flotation tests for relevant pure minerals (including diaspore, pyrophyllite and kaolinite) were carried out at different conditions using commercial oleic acids with iodine values of 65, 121 and 131. The results suggest that an increase in the iodine value of oleic acid would lead to improved flotation separation of diaspore from aluminosilicates. Use of the commercial oleic acid with iodine value of 131 in closed-circuit flotation tests allowed us to obtain a concentrate with alumina-to-silica (A/S) ratio of 5.33 and alumina recovery of 85.56% from the feed ore (A/S ratio  3.39). Chemical analyses of these commercial oleic acids found that an increase in the iodine value was associated with increased proportion of linoleic acid in the commercial oleic acids. To fundamentally understand the correlation between the iodine value of commercial oleic acids and the efficiency of flotation separation of diaspore from aluminosilicates, the computational studies of frontier molecular orbital energy of oleic and linoleic acid were done, and the results suggest that linoleic acid has higher chemical activity than oleic acid and its chemical adsorption on diaspore is more stable than that of oleic acid.</div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"168 ","pages":"Pages 95-101"},"PeriodicalIF":0.0,"publicationDate":"2017-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.09.013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47689446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Role of surface roughness in the attachment time between air bubble and flat ultra-low-ash coal surface 表面粗糙度对气泡与超低灰分扁平煤表面附着时间的影响

International Journal of Mineral Processing Pub Date : 2017-11-10 DOI: 10.1016/j.minpro.2017.09.006

Wencheng Xia

{"title":"Role of surface roughness in the attachment time between air bubble and flat ultra-low-ash coal surface","authors":"Wencheng Xia","doi":"10.1016/j.minpro.2017.09.006","DOIUrl":"10.1016/j.minpro.2017.09.006","url":null,"abstract":"<div>Surface roughness plays an important role in the floatability and wettability of mineral and coal particles. However, the role of surface roughness in the floatability of coal particles has not been sufficiently investigated because coal consists of organic and inorganic materials. This paper is to obtain some insights into the role of surface roughness in the coal surface wettability. In this investigation, Taixi ultra-low-ash coal particles, with ash content of 1.55%, were polished and the polished flat coal surfaces with various roughness were obtained. The attachment time between air bubble and flat coal surface were tested at the water solution without flotation reagents. Throughout this paper, it was found that the attachment time increased with the increase of roughness of coal surface. The attachment area between bubble and flat coal surface was decreased with the increase of surface roughness. The attachment between bubble and flat rough coal surface was unstable, compared to the attachment between bubble and smooth coal surface. The rougher coal surface makes the detachment between bubble and coal surface easier than the smoother coal surface. The higher the roughness of coal surface is, the more pores and grooves the coal surface has. The pores, gaps and grooves are filled up with the water in the slurry and have negative effects on the attachment between bubble and flat coal surface.</div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"168 ","pages":"Pages 19-24"},"PeriodicalIF":0.0,"publicationDate":"2017-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.09.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49310383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 26