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International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1203-1215页

作者： Sandeep Kumar Jena Jogeshwar Sahu Geetikamayee Padhy Swagatika Mohanty Ajit Dash Mineral Processing and Central Characterization Department Council of Scientific and Industrial Research(CSIR)-Institute of Minerals and Materials Technology(IMMT)BhubaneswarOdisha 751013India

The present paper reports the effective utilization of marble sludge powder(MSP)for the recovery of potash values from waste mica scrap using chlorination roasting-water leaching *** studies indicated the presence of dolomite as the major mineral phase in MSP,whereas muscovite and quartz were observed in the mica *** acid leaching studies suggest a maximum of 22%potash recovery under conditions:4 M H2SO4 acid,particle size of^100μm,stirring speed of 600 r/min,leaching temperature of 75℃,and leaching time of 90 *** chlorination roasting-water leaching process was adopted to achieve the lowest level of 80%-90%potash *** optimum conditions for the recovery of^93%potash from mica(~8.6wt%K2O)requires 900℃ roasting temperature,30 min roasting time,and 1:1:0.75 mass ratio of mica:MSP:*** roasting temperature and amount of NaCl are found to be the most important factors for the recovery *** reaction mechanism suggests the formation of different mineral phases,including sylvite(KCl),wollastonite,kyanite,and enstatite,during roasting,which were confirmed by X-ray diffraction(XRD)analyses and scanning electron microscopy(SEM)*** MSP-blended NaCl additive is more effective for potash recovery compared with the other reported commercial roasting additives.

关键词： potash recovery mica scrap marble sludge powder chlorination roasting water leaching

A two-step zircon decomposition method to produce zirconium oxychloride:alkali fusion and water leaching

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Rare Metals 2020年第4期39卷 448-454页

作者： Jing Song Jing-Fei Fan Jing-Chong Liu Ran Liu Jing-Kui Qu Tao Qi National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy SciencesBeijing 100190China School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100China

In this work,a two-step zircon method to produce zirconium oxychloride was introduced,and the alkali fusion technique with NaOH and water leaching process were *** effects of the operating conditions on the decomposition of zircon were determined,and the optimal conditions are as follows:alkali/zircon mass ratio of 0.7 at the first step and 0.6 at the second step(0.7+0.6),fusion temperature of 700℃and fusion time of 0.5 h at the first step and 0.5 h at the second step(0.5+0.5 h).Under these conditions,the decomposition alloy of zircon sand can reach 97.25%.In the fusion process of zircon sand,the products of first step are mainly Na2ZrO3 and ZrSiO4,the products of second step are Na2ZrO3 and Na2SiO3,and the diffraction peaks of Na2ZrSiO5 are not *** conditions of water leaching process were investigated as well,and the optimal conditions are as follows:liquid-solid ratio of 5:1,leaching time of 0.5 h,leaching temperature of 50℃and leaching three *** these conditions,the contents of leaching products SiO2 and Na2O are 3.51%(40%ZrO2)and 4.46%(40%ZrO2),*** crystal phase structures of Na2ZrO3 and Na2SiO3 are formed in water leaching process.

关键词： Zirconium oxychloride Zircon Two-step alkali fusion water leaching

Intensifying recovery of metallic aluminum in secondary aluminum dross by alkali roasting−water leaching

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Transactions of Nonferrous Metals Society of China 2024年第12期34卷 4063-4074页

作者： Chen LI Wei LIU Fen JIAO Liang-min DONG Shi-yang LIU Wen-qing QIN School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

An innovative process was proposed to recover metallic aluminum from secondary aluminum dross(SAD)by alkali roasting−water *** calculations and experimental results were used to illustrate the phase transformation and reaction mechanism of the alkali roasting *** leaching behaviors of roasted residue were also *** optimal conditions,the aluminum extraction rate reached 93.08%.In addition,the kinetics of the water leaching of roasted products was studied through shrinking core model,and it was revealed that the leaching process of aluminum was in accord with diffusion *** apparent activation energy of the leaching process was calculated to be 3.44 kJ/*** on the above study,the underlying mechanism of the alkali roasting−water leaching was clarified.

关键词： secondary aluminum dross aluminum recovery selective separation alkali roasting water leaching

Recovery of vanadium and tungsten from waste selective catalytic reduction catalysts by K_(2)CO_(3) roasting and water leaching followed by CaCl_(2) precipitation

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International Journal of Coal Science & Technology 2021年第4期8卷 727-736页

作者： Xianghui Liu Qiaowen Yang School of Chemical and Environmental Engineering China University of Mining and TechnologyBeijingDing No.11 Xueyuan RoadHaidian DistrictBeijing 100083China

Waste selective catalytic reduction(SCR)catalysts are potential environmental *** this study,the recovery of vanadium and tungsten from waste SCR catalysts by K_(2)CO_(3)roasting and water leaching was *** roasting and leaching conditions were optimized:the leaching efficiencies of vanadium and tungsten were 91.19%and 85.36%,respectively,when 18 equivalents of K_(2)CO_(3)were added to perform the roasting at 900℃ for 2 h,followed by leaching at 90°C for 1 ***,in the described conditions,the leaching rate of silicon was only 28.55%.Titanates,including K_(2)Ti_(6)O_(13)and KTi8017,were also *** removal was achieved in 85%efficiency adjusting the pH to 9.5,and the Si impurity thus isolated was composed of amorphous *** and vanadium were precipitated using CaCl_(2).At pH 10 and following the addition of 0.10 mol of H_(2)O_(2)and 16 equivalents of CaCl_(2),the precipitating efficiencies of tungsten and vanadium were 96.89%and 99.65%,*** overall yield of tungsten and vanadium was 82.71%and 90.87%,respectively.

关键词： Recovery Waste SCR catalyst K_(2)CO_(3)roasting water leaching CaCl_(2)precipitation

Fe extraction from high-silicon and aluminum cyanide tailings by pretreatment of water leaching before magnetic separation

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Transactions of Nonferrous Metals Society of China 2013年第4期23卷 1165-1173页

作者：张亚莉李怀梅于先进山东理工大学化学工程学院淄博255081

Pretreatment of high content of Si- and Al-containing cyanide tailings by water leaching to remove some impurities, such as the major impurities minerals of Si and A1, as well as its effect on Fe extraction in the water leaching process was investigated. The effects of different parameters on iron recovery were studied, and the reaction parameters were proposed as follows： sodium carbonate content of 30%, water leaching at 60 ~C for 5 min, liquid/solid ratio of 15：1, and exciting current of 2 A. Under these optimal conditions, magnetic concentrate containing 59.11% total iron and a total iron recovery rate of 76.12% was obtained. In addition, the microstructure and phase transformation of the process of water leaching were studied by X-ray powder diffraction technique （XRD）, Electronic image of backscattering （BEI）, X-ray fluorescence （XRF）, and energy dispersive spectrometry （EDS）. The results indicate that the soluble compound impurities generated in the roasting process are washed out, and the dissoluble substances enter into nonmagnetic materials by water leaching, realizing the effective separation of impurities and Fe.

关键词： water leaching cyanide tailings grade of magnetic concentrate recovery rate of iron yield of magnetic concentrate

Extraction of lithium from lepidolite using chlorination roasting-water leaching process

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Transactions of Nonferrous Metals Society of China 2012年第7期22卷 1753-1759页

作者：颜群轩李新海王志兴王接喜郭华军胡启扬彭文杰伍习飞中南大学冶金科学与工程学院长沙410083

Chlorination roasting followed by water leaching process was used to extract lithium from *** microstructure of the lepidolite and roasted materials were characterized by X-ray diffraction（XRD）.Various parameters including chlorination roasting temperature,time,type and amount of chlorinating agents were *** conditional experiments indicate that the best mass ratio of lepidolite to NaCl to CaCl2 is 1：0.6：0.4 during the roasting *** extraction of lithium reaches peak value of 92.86% at 880 °C,potassium,rubidium,and cesium 88.49%,93.60% and 93.01%,*** XRD result indicates that the major phases of the product after roasting lepidolite with mixture of chlorinating agents（CaCl2 and NaCl） are SiO2,CaF2,KCl,CaSiO3,CaAl2Si2O8,NaCl and NaAlSi3O8.

关键词： lepidolite lithium chlorination roasting water leaching

Recovery of valuable metals from zinc leaching residue by sulfate roasting and water leaching

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Transactions of Nonferrous Metals Society of China 2017年第5期27卷 1180-1187页

作者： Guo-min JIANG Bing PENG Yan-jie LIANG Li-yuan CHAI Qing-wei WANG Qing-zhu LI Ming HU School of Metallurgy and Environment Central South University Changsha 410083 China Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution Changsha 410083 China Changsha Science Environmental Technology Co. Ltd. Changsha 410000 China

Zinc leaching residue(ZLR),produced from traditional zinc hydrometallurgy process,is not only a hazardous waste but also a potential valuable *** combination of sulfate roasting and water leaching was employed to recover the valuable metals from *** ZLR was initially roasted with ferric sulfate at640°C for1h with ferric sulfate/zinc ferrite mole ratio *** this process,the valuable metals were efficiently transformed into water soluble sulfate,while iron remains as ferric ***,water leaching was conducted to extract the valuable metals sulfate for *** recovery rates of zinc,manganese,copper,cadmium and iron were92.4%,93.3%,99.3%,91.4%and1.1%,respectively.A leaching toxicity test for ZLR was performed after water *** results indicated that the final residue was effectively detoxified and all of the heavy metal leaching concentrations were under the allowable limit.

关键词： zinc leaching residue sulfate roasting water leaching valuable metals recovery

Extraction of molybdenum and nickel from roasted Ni-Mo ore by hydrochloric acid leaching, sulphation roasting and water leaching

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Transactions of Nonferrous Metals Society of China 2017年第1期27卷 220-226页

作者：羡鹏飞周升帆王明玉王学文陈边防中南大学冶金与环境学院长沙410083

To extract molybdenum and nickel from the roasted Ni-Mo ore, a process of hydrochloric acid leaching, sulphation roasting and water leaching was investigated. The results showed that this process could get a high leaching rate of Mo and Ni. Under the optimum conditions of hydrochloric acid leaching （roasted Ni-Mo ore leached with 0.219 mL/g hydrochloric acid addition at 65 ℃ for 30 min with a L/S ratio of 3 mL/g）, sulphation roasting （51.9% sulfiaric acid addition, roasting temperature 240 ℃ for 1 h）, followed by leaching with the first stage hydrochloric acid leaching solution at 95 ℃ for 2 h, the leaching rates of Mo and Ni reached 95.8% and 91.3%, respectively.

关键词： molybdenum nickel Ni-Mo ore hydrochloric acid leaching sulphation roasting water leaching

Migration and distribution of saline ions in bauxite residue during water leaching

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Transactions of Nonferrous Metals Society of China 2018年第3期28卷 534-541页

作者： Xiang-feng KONG Xing-xing JIANG Sheng-guo XUE Ling HUANG William HARTLEY Chuan WU Xiao-fei LI School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Central South UniversityChangsha 410083China

Bauxite residue,a highly saline solid waste produced from digestion of bauxite for alumina production,is hazardous to the environment and restricts vegetation establishment in bauxite residue disposal areas.A novel water leaching process proposed here was used to investigate the dynamic migration and vertical distribution of saline ions in bauxite *** results show that water leaching significantly reduced the salinity of bauxite residue,leaching both saline cations Na+,K+,Ca2+and anions CO32-,SO42-,HCO3-.Na+and K+migrated from 40-50 to 20-30 cm of the column,presenting a high migration *** migration capacity of Ca2+was lower and accumulated at 30-40 cm of the ***32-initially distributed at 20-30 cm of the column,subsequently transported to 30-40 cm of the column,and finally returned to 20-30 cm of the column along with ***42-was originally distributed at 40-50 cm,but finally migrated to 20-30 cm of the ***,HCO3-remained at the bottom of the column,and its migratory was less affected by evaporation.

关键词： bauxite residue salinity ion migration column stimulation water leaching

Recovery of titanium and vanadium from titanium–vanadium slag obtained by direct reduction of titanomagnetite concentrates

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Rare Metals 2022年第5期41卷 1688-1696页

作者： Xue-Jie Liu De-Sheng Chen Jing-Long Chu Wei-Jing Wang Yong-Li Li Tao Qi National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemistry and Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

A process of NaOH molten salt roasting-water leaching to treat titanium-vanadium slag obtained by direct reduction of titanomagnetite concentrates was investigated.X-ray diffraction(XRD), scanning electron microscopy(SEM) equipped with energy dispersive spectroscopy(EDS), and thermogravimetry-differential scanning calorimetry(TG-DSC) techniques were used to characterize the samples. The results show that anosovite(Mg_(x)Ti_(3-x)O_(5))and clinopyroxene [Ca(Ti,MgAl)(SiAl)_(2)O_(6)] are the major phases of titanium-vanadium slag. In the NaOH molten salt roasting process, titanium is converted to intermediate product Na_(2)TiO_(3) and vanadium is converted to water-soluble vanadate. The response surface methodology(RSM) was used to optimize the roasting process conditions. NaOH to slag mass ratio(N/S) and roasting temperature are the main influential factors. Under the optimal roasting conditions,i.e., roasting temperature of 550℃, N/S of 1.20, and roasting time of 80 min, the conversions of titanium and vanadium are 96.5 % and 93.0 %, respectively. In the water leaching process, Na_(2)TiO_(3) is converted to amorphous structure of H_(2)TiO_(3) since Na^(+)is exchanged with H^(+). Up to 93.0 % vanadium is leached out under the optimal leaching conditions. Titanium and vanadium in the titanium-vanadium slag can be separated and then recovered.

关键词： Recovery Titanium-vanadium slag Roasting water leaching Titanomagnetite concentrates