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Leaching behavior of metals from limonitic laterite ore by high pressure acid leaching 被引量:14
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作者 郭学益 石文堂 +1 位作者 李栋 田庆华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第1期191-195,共5页
The leaching behavior of metals from a nickeliferous limonitic laterite ore was investigated by high pressure acid leaching process for the extraction of nickel and cobalt.The effects of sulfuric acid added,leaching t... The leaching behavior of metals from a nickeliferous limonitic laterite ore was investigated by high pressure acid leaching process for the extraction of nickel and cobalt.The effects of sulfuric acid added,leaching temperature,leaching time and liquid/solid(L/S) ratio on metals extraction were examined.More than 97% Ni,96% Co,93% Mn,95% Mg and less than 1% Fe are extracted under optimum conditions.Analysis of the high pressure acid leaching residue by chemical and XRD analysis indicates that the residual iron and sulfur are mainly present in phases of hematite and alunite,respectively.The high pressure leaching process provides a simple and efficient way for the high recovery of nickel and cobalt from laterite ore,leaving residue as a suitable iron resource. 展开更多
关键词 high pressure acid leaching limonitic laterite leaching behavior NICKEL
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φ-pH diagram of V-Ti-H_2O system during pressure acid leaching of converter slag containing vanadium and titanium 被引量:4
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作者 牟望重 张廷安 +2 位作者 豆志河 吕国志 刘燕 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第9期2078-2086,共9页
To analyze the thermodynamic characteristics of leaching process of converter slag, φ-pH diagram of V-Ti-H2O system at oxygen partial pressure of 0.5 MPa, ionic mass concentration of 0.1 mol/kg and temperatures rangi... To analyze the thermodynamic characteristics of leaching process of converter slag, φ-pH diagram of V-Ti-H2O system at oxygen partial pressure of 0.5 MPa, ionic mass concentration of 0.1 mol/kg and temperatures ranging from 60 to 200 ℃ was obtained by recently published critically assessed standard Gibbs energies and activity coefficients of various species. When pH2, stable regions of V3+, VO2+ and VO2+ exist in the stable region of TiO2. The pH values of stable regions of vanadium and titanium decrease and redox potentials become more positive with the temperature increasing. Vanadium and titanium could be separated by one-step leaching based on thermodynamics. The experiment results of pressure acid leaching of converter slag show that leaching rates of vanadium and titanium are 96.87% and 8.76% respectively, at 140 ℃ of temperature, 0.5 MPa of oxygen partial pressure, 0.055-0.075mm of particle size, 15:1 of liquid to solid ratio, 120 min of leaching time, 500 r/min of stirring speed and 200 g/L of initial acid concentration. Vanadium and titanium could be selectively separated in the pressure acid leaching process, and the experiment result is in agreement with thermodynamic calculation result. 展开更多
关键词 φ-pH diagram V-Ti-H2O system pressure acid leaching converter slag VANADIUM titanium
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Extracting vanadium from stone-coal by oxygen pressure acid leaching and solvent extraction 被引量:16
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作者 邓志敢 魏昶 +3 位作者 樊刚 李旻廷 李存兄 李兴彬 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第S1期118-122,共5页
Vanadium extraction from stone-coal was investigated by oxygen pressure acid leaching and solvent extraction.The mineralogy of the stone-coal from Tongren City of Guizhou Province,China,was investigated by various det... Vanadium extraction from stone-coal was investigated by oxygen pressure acid leaching and solvent extraction.The mineralogy of the stone-coal from Tongren City of Guizhou Province,China,was investigated by various determination methods. The effects of leaching time,leaching temperature,leaching agent concentration,leaching L/S ratio,granularity of material,additive consumption were investigated based on the mineralogy.The results show that under the conditions of leaching time of 3-4 h, temperature of 150℃,sulfuric acid consumption of 25%?30%,ratio of liquid to solid of 1.2:1,the granularity less than 0.074 mm, additive consumption of 3%-5%,and oxygen pressure of 1.2 MPa,and the vanadium leaching rate can be more than 92%by the method of two-step pressurized acid leaching.The powdery V2O5 product with 99.52%in V2O5 content is obtained by the flowsheet of acid recovery,removing iron by reduction process,solvent extraction,precipitating vanadium with ammonium water,and pyrolysis from the stone-coal oxygen pressure acid-leaching solution.The total recovery efficiency of vanadium is above 85%,which is more than 20%higher than that obtained in the conventional process.Furthermore,the new process does not cause air pollution since no HCl or Cl2 is released by calcination of the raw material. 展开更多
关键词 stone-coal extracting vanadium oxygen pressure acid leaching acid recovery solvent extraction
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Extraction of vanadium from vanadium slag by high pressure oxidative acid leaching 被引量:12
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作者 Guo-quan Zhang Ting-an Zhang +3 位作者 Guo-zhi Lü Ying Zhang Yan Liu Zhuo-lin Liu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第1期21-26,共6页
To extract vanadium in an environment friendly manner, this study focuses on the process of leaching vanadium from vanadium slag by high pressure oxidative acid leaching. Characterizations of the raw slag, mineralogy ... To extract vanadium in an environment friendly manner, this study focuses on the process of leaching vanadium from vanadium slag by high pressure oxidative acid leaching. Characterizations of the raw slag, mineralogy transformation, and the form of leach residues were made by X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The result shows that the vana-dium slag is composed of major phases of fayalite, titanomagnetite, and spinel. During the high pressure oxidative acid leaching process, the fayalite and spinel phases are gradually decomposed by sulfuric acid, causing the release of vanadium and iron in the solution. Meanwhile, unreacted silicon and titanium are enriched in the leach residues. With the initial concentration of sulfuric acid at 250 g·L^-1, a leaching tem-perature of 140℃, a leaching time of 50 min, a liquid-solid ratio of 10:1 mL·g^-1, and oxygen pressure at 0.2 MPa, the leaching rate of vana-dium reaches 97.69%. 展开更多
关键词 EXTRACTION VANADIUM SLAG pressure leaching sulfuric acid MINERALOGY
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An investigation of oxygen pressure acid leaching of Gacun complex Cu-Pb bulk concentrate 被引量:6
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作者 Xu, Bin Zhong, Hong Jiang, Tao 《Rare Metals》 SCIE EI CAS CSCD 2012年第1期96-101,共6页
The treatment of the Gacun complex Cu-Pb bulk concentrate with high Zn,Ag,etc.,by oxygen pressure acid leaching was studied.The pri-mary copper and leadminerals in the concentrate are tetrahedrite and galena.The treat... The treatment of the Gacun complex Cu-Pb bulk concentrate with high Zn,Ag,etc.,by oxygen pressure acid leaching was studied.The pri-mary copper and leadminerals in the concentrate are tetrahedrite and galena.The treatment of tetrahedrite was rarely studied,and most of silver occurred in themineral too.The optimum operating parameters of oxygen pressure acid leaching were established by conditional tests.Under these parameters,the result of pilot scale test showed that the leaching percentages of copper and zinc were separately as high as 98.9 wt.% and 94.9 wt.%,while lead and silver were transformed into sulfate and sulfide precipitations,respectively.The copper and zinc in lixivium were reclaimed by extraction-electrowinning and purification-electrowinning,respectively,and the lead and silver in the residue were reclaimed separately by carbonate transformation-silicofluoric acid leaching and thiourea leaching. 展开更多
关键词 nonferrous metallurgy synthetic reclaiming oxygen pressure acid leaching complex Cu-Pb bulk concentrate TETRAHEDRITE
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Pressure acid leaching of zinc sulfide concentrate 被引量:5
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作者 古岩 张廷安 +4 位作者 刘燕 牟望重 张伟光 豆志河 蒋孝丽 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第S1期136-140,共5页
Effects of particle size of the zinc sulfide concentrate,leaching temperature,solid-to-liquid ratio and additive amount on pressure acid leaching process of the zinc sulfide concentrate were studied.The results indica... Effects of particle size of the zinc sulfide concentrate,leaching temperature,solid-to-liquid ratio and additive amount on pressure acid leaching process of the zinc sulfide concentrate were studied.The results indicate that the additive can improve the reaction kinetics and the conversion rate.And sulfur can be successfully separated from the zinc sulfide concentrate as elemental sulfur.The reasonable experiment parameters are obtained as follows:the leaching temperature 150℃,oxygen partial pressure 1 MPa,additive amount 1%,solid-to-liquid ratio 1:4,leaching time 2 h,initial sulfuric acid concentration 15%,and particle size less than 44μm.Under the optimum conditions,the leaching rate of the zinc can reach 95%and the reduction rate of the sulfur can reach 90%. 展开更多
关键词 zinc sulfide concentrate pressure acid leaching ZINC SULFUR
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Pressure leaching of zinc silicate ore in sulfuric acid medium 被引量:11
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作者 李存兄 徐红胜 +3 位作者 邓志敢 李兴彬 李旻廷 魏昶 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第5期918-923,共6页
Zinc silicate ore was characterized mineralogically and the results showed that zinc exists mainly as hemimorphite and smithsonite in the sample.Sulfuric acid pressure leaching of zinc silicate ore was carried out to ... Zinc silicate ore was characterized mineralogically and the results showed that zinc exists mainly as hemimorphite and smithsonite in the sample.Sulfuric acid pressure leaching of zinc silicate ore was carried out to assess the effect of particle size,sulfuric acid concentration,pressure,reaction time and temperature on the extraction of zinc and the dissolution of silica.Under the optimum conditions employed,up to 99.25% of zinc extraction and 0.20% silica dissolution are obtained.The main minerals in leaching residue are quartz and small amounts of undissolved oxide minerals of iron,lead and aluminum are associated with quartz. 展开更多
关键词 zinc silicate ore sulfuric acid pressure leaching extraction of zinc dissolution of silica
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Microwave pretreatment for enhanced selective nitric acid pressure leaching of limonitic laterite 被引量:6
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作者 HE Fei MABao-zhong +5 位作者 WANG Cheng-yan MAYu-tian ASSELIN Edouard CHEN Yong-qiang ZHANGWen-juan ZHAO Jian 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第10期3050-3060,共11页
As clean energy,the microwave is commonly used to pretreat various ores.In this work,the microwave dielectric properties of limonitic laterite ore were measured by resonant cavity perturbation technique and the effect... As clean energy,the microwave is commonly used to pretreat various ores.In this work,the microwave dielectric properties of limonitic laterite ore were measured by resonant cavity perturbation technique and the effects from microwave were systematically investigated.Results indicated that limonitic laterite had high microwave absorbance.After microwave pretreatment,the microstructure of the laterite became less aggregated and more porous and the main phase transformed from goethite to hematite that improved leaching in nitric acid(1.2 kg HNO3/kg ore);Ni,Co,Fe,and Mg extraction ratios were 95.2%,98.1%,1.8%and 15%,respectively,after leaching for 60 min at 200°C and 500 r/min.Furthermore,in the process of goethite to hematite by microwave pretreatment,the nickel-containing mineral is activated,which makes nickel be leached easily.The leaching process has high Ni extraction ratio compared to that without microwave(82%)and conventional pretreatment(90.4%).Therefore,microwave pretreatment of limonitic laterite before nitric acid pressure leaching is an effective way to improve the selectivity and extraction of the leach. 展开更多
关键词 limonitic laterite ore microwave pretreatment nitric acid pressure leaching NI CO
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Pressure acid leaching of black shale for extraction of vanadium 被引量:2
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作者 李旻廷 魏昶 +3 位作者 樊刚 李存兄 邓志敢 李兴彬 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第S1期112-117,共6页
Extraction of vanadium from black shale was attempted in pressure acid leaching.The chemical components of the sample obtained from Guizhou Province of China show that it contains 3.258%V2O5,52.880%SiO2 and 16.140%Al2... Extraction of vanadium from black shale was attempted in pressure acid leaching.The chemical components of the sample obtained from Guizhou Province of China show that it contains 3.258%V2O5,52.880%SiO2 and 16.140%Al2O3.Phase analyses of vanadium indicates vanadium mainly exists in the free oxide and mica.Vanadium contents in the two phases are 18%and 53%, respectively.The contents of V3 +,V 4+and V 5+are almost equal.Under the optimum parameters of one-step leaching(reaction time of 3 h,sulfuric addition of 25%,temperature of 150℃,liquid to solid ratio of 1.2 mL/g,catalyst(FeSO4)addition of 5%and size of 85%particle 0.074 mm),about 77%of vanadium is recovered.After two-step countercurrent leaching,the leach recovery of vanadium can reach above 90%.Air replacing oxygen is completely feasible.The impurity metals can dissolve into solution in different degrees. 展开更多
关键词 pressure acid leaching black shale VANADIUM CATALYST
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Oxygen pressure acid leaching of Gacun complex Cu concentrates
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作者 XU Bin ZHONG Hong JIANG Tao 《Journal of Central South University》 SCIE EI CAS 2012年第1期71-76,共6页
The treatment of the Gacun complex Cu concentrate with high contents of Pb,Zn,Ag,etc by oxygen pressure acid leaching was studied.It is unusual that tetrahedrite,whose treatment was rarely studied,is the primary coppe... The treatment of the Gacun complex Cu concentrate with high contents of Pb,Zn,Ag,etc by oxygen pressure acid leaching was studied.It is unusual that tetrahedrite,whose treatment was rarely studied,is the primary copper mineral of the concentrates.Most of silver also occurs in the mineral.The optimum operating parameters of oxygen pressure acid leaching were established by conditional tests.Pilot scale test was carried out under the parameters,and the leaching rates of copper and zinc are as high as 97.10% and 89.83% while lead and silver are transformed into sulfate and sulfide respectively and stay in leaching residue.The copper and zinc in lixivium were reclaimed by extraction-electrowinning and purification-electrowinning,respectively,and the lead and silver in the residue were reclaimed separately by chloride leaching and thiourea leaching.The extraction rate of copper achieves 96%,and the leaching rates of lead and silver reach 90% and 95%,respectively. 展开更多
关键词 complex Cu concentrates oxygen pressure acid leaching synthetic reclaiming TETRAHEDRITE
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Kinetics of indium dissolution from marmatite with high indium content in pressure acid leaching 被引量:11
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作者 Lei Tian Yan Liu +3 位作者 Ting-An Zhang Guo-Zhi Lv Shuang Zhou Guo-Quan Zhang 《Rare Metals》 SCIE EI CAS CSCD 2017年第1期69-76,共8页
The kinetics of oxygen pressure acid leaching marmatite with high indium content was studied. The effects of particle size, agitation rate, temperature, HSOconcentration, and oxygen partial pressure on leaching rate o... The kinetics of oxygen pressure acid leaching marmatite with high indium content was studied. The effects of particle size, agitation rate, temperature, HSOconcentration, and oxygen partial pressure on leaching rate of indium were investigated. The results show that when the agitation rate is above 600 r-min, its influence on indium leaching rate is insignificant. It is determined that the leaching rates increase with the increase in sulfuric acid concentration, temperature, partial oxygen pressure, and the decrease in particle size. Moreover, the results demonstrate that the process of indium leaching is controlled by interface chemical reaction, with apparent activation energy of 65.7 k J-mol. The apparent reaction orders of sulfuric acid and oxygen partial pressure are determined to be 0.749 and 1.260, respectively. The leaching reaction process follows shrinking unreacted core model. And finally, the kinetics model equation is established for indium. 展开更多
关键词 MARMATITE INDIUM Oxygen pressure acid leaching KINETICS Activation energy Reaction order
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Dissolution kinetics and thermodynamic analysis of vanadium trioxide during pressure oxidation 被引量:4
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作者 Zhou, Xuejiao Wei, Chang +4 位作者 Xia, Wentang Li, Minting Li, Cunxiong Deng, Zhigan Xu, Hongsheng 《Rare Metals》 SCIE EI CAS CSCD 2012年第3期296-302,共7页
The dissolution kinetics of vanadium trioxide in sulphuric acid-oxygen medium was examined. It was determined that the concentration of sulphuric acid and stirring speed above 800 r min 1 did not significantly affect ... The dissolution kinetics of vanadium trioxide in sulphuric acid-oxygen medium was examined. It was determined that the concentration of sulphuric acid and stirring speed above 800 r min 1 did not significantly affect vanadium extraction. The dissolution rate increased with increasing temperature and oxygen partial pressure, but decreased with increasing particle size. The dissolution kinetics was controlled by the chemical reaction at the surface with the estimated activation energy of 43.46 kJ·mol-1. The leaching mechanism was confirmed by characterizing vanadium trioxide and the dissolution residue using SEM-EDS analysis. Combined with thermodynamic calculation, the pressure leaching of vanadium trioxide in the temperature range (100 to 140 ℃) studied occurs as follows: V2O3 + O2 + H2SO4 = (VO2)2SO4 + H2O. 展开更多
关键词 HYDROMETALLURGY KINETICS oxygen pressure acid leaching THERMODYNAMICS VANADIUM
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Pressure nitric acid leaching of alkali-pretreated low-grade limonitic laterite 被引量:4
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作者 Yong-Lu Zhang Cheng-Yan Wang +2 位作者 Yong-Qiang Yang Fei Yin Bao-Zhong Ma 《Rare Metals》 SCIE EI CAS CSCD 2015年第1期64-70,共7页
The pressure nitric acid leaching of alkali-pre- treated low-grade limonitic laterite, as well as removing impurity AI(III) and preparing intermediate product of nickel/cobalt sulphide from leaching liquor were inve... The pressure nitric acid leaching of alkali-pre- treated low-grade limonitic laterite, as well as removing impurity AI(III) and preparing intermediate product of nickel/cobalt sulphide from leaching liquor were investi- gated. After pretreatment, iron exists in the form of amorphous iron oxides, while nickel is adsorbed on the surface of iron oxides in the form of nickel oxide. The preferable pressure leaching conditions are determined as follows: leaching temperature of 458 K, leaching duration of 60 min, initial acidity of nitric acid of 1.90 mol.L-~ and liquid to solid ratio of 3:1 (volume to mass ratio). Under these conditions, the leaching efficiencies of Ni, Co and A1 are 95 %, 88 % and 55 %, respectively, and that of Fe is less than 1%. The loss rates of Ni and Co are 1.8 % and 1.5 %, respectively, during the step of removing impurity AI(III). The sulphide precipitation process produces the interim production of nickel/cobalt sulphides, recovering greater than 99 % of Ni and Co in the purified solution. The iron-rich (〉60 %) pressure leaching residue with low Cr, S can be further reclaimed as the raw materials for iron making. 展开更多
关键词 Limonitic laterite Alkali-pretreated pressure-leaching Nitric acid NICKEL
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Influence of Mechanical Activation on Acid Leaching Dephosphorization of High-phosphorus Iron Ore Concentrates 被引量:1
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作者 De-qing ZHU Hao WANG +1 位作者 Jian PAN Cong-cong YANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第7期661-668,共8页
High pressure roll grinding(HPRG)and ball milling were compared to investigate the influence of mechanical activation on the acid leaching dephosphorization of a high-phosphorus iron ore concentrate,which was manufa... High pressure roll grinding(HPRG)and ball milling were compared to investigate the influence of mechanical activation on the acid leaching dephosphorization of a high-phosphorus iron ore concentrate,which was manufactured through magnetizing roasting-magnetic separation of high-phosphorus oolitic iron ores.The results indicated that when high-phosphorus iron ore concentrates containing 54.92 mass% iron and 0.76 mass% phosphorus were directly processed through acid leaching,iron ore concentrates containing 55.74mass%iron and 0.33mass%phosphorus with an iron recovery of 84.64%and dephosphorization of 63.79% were obtained.When high-phosphorus iron ore concentrates activated by ball milling were processed by acid leaching,iron ore concentrates containing56.03mass%iron and 0.21mass% phosphorus with an iron recovery of 85.65% and dephosphorization of 77.49%were obtained.Meanwhile,when high-phosphorus iron ore concentrates activated by HPRG were processed by acid leaching,iron ore concentrates containing 58.02mass%iron and 0.10mass% phosphorus were obtained,with the iron recovery reaching 88.42% and the dephosphorization rate reaching 88.99%.Mechanistic studies demonstrated that ball milling can reduce the particle size,demonstrating aprominent reunion phenomenon.In contrast,HPRG pretreatment contributes to the formation of more cracks within the particles and selective dissociation of iron and P bearing minerals,which can provide the favorable kinetic conditions to accelerate the solid-liquid reaction rate.As such,the crystal structure is destroyed and the surface energy of mineral particles is strengthened by mechanical activation,further strengthening the dephosphorization. 展开更多
关键词 high-phosphorus iron ore concentrate high pressure roll grinding ball milling selective dissociation sulfuric acid leaching dephosphorization iron recovery
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熟化银精矿氧压强化酸浸行为研究 被引量:1
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作者 刘强 李存兄 +3 位作者 顾智辉 李倡纹 王启亮 宋健清 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第6期2092-2105,共14页
考虑到浮选银精矿极具回收价值及现有处理工艺存在不足,本文提出了浓硫酸熟化-氧压酸浸的工艺路线。首先,以湿法炼锌过程产出的浮选银精矿为对象,利用浓硫酸的强氧化性破坏浮选残留有机药剂矿物包裹体;其次,利用加压湿法冶金独特的技术... 考虑到浮选银精矿极具回收价值及现有处理工艺存在不足,本文提出了浓硫酸熟化-氧压酸浸的工艺路线。首先,以湿法炼锌过程产出的浮选银精矿为对象,利用浓硫酸的强氧化性破坏浮选残留有机药剂矿物包裹体;其次,利用加压湿法冶金独特的技术优势,氧化溶解低价金属硫化物;最后,重点研究了工艺过程原理及氧压酸浸过程中Zn、Cu、In的浸出行为及浸出渣中物相演变规律。研究结果表明:银精矿颗粒表面残留浮选药剂的P—O、—OH极性基团被浓硫酸氧化破坏,避免产生水化膜及矿物包裹体,促进有价元素的高效浸出;在高温氧化性条件和Fe^(3+)/Fe^(2+)变价离子对的助浸作用下,银精矿物相组成由闪锌矿(Zn S)、锌铁尖晶石(Zn Fe_(2)O_(4))、雌黄铁矿(FeS)、氯化亚铜(Cu Cl)为主,转变为以单质硫(S8)、铁矾(MeFe_(3)(SO_(4))_(2)(OH)_(6),Me:1/2Pb、Na、K)为主,并残留少量的闪锌矿(Zn S);适当提高反应温度和初始质量浓度可促进Zn、Cu、In的浸出,但温度过高会加剧铟铁共沉淀问题,降低锌、铟的浸出率,而质量浓度过高会降低氧气对Zn S及Fe^(2+)的氧化能力,抑制银精矿的溶解;延长反应时间、提高液固比均有利于银精矿的解离浸出;增大氧分压可以加强Fe^(3+)的氧化能力,促进对Zn S及ZnxFe(1-x)S的氧化作用,有利于银精矿的溶解。在反应温度为155℃、初始质量浓度为160 g/L、反应时间为180 min、氧分压为0.8 MPa、液固比为7 m L/g的氧压酸浸条件下,银精矿中Zn、Cu、In的浸出率分别为94.84%、98.36%和91.13%,浸出渣中铅、银的富集率分别达2.88%和7754 g/t。 展开更多
关键词 浮选银精矿 浓硫酸熟化 水化作用 氧压酸浸 浸出率
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含锗银精矿浓硫酸熟化—氧压酸浸行为研究
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作者 刘强 李存兄 +2 位作者 王国栋 陈帮耀 王启亮 《有色金属(冶炼部分)》 CAS 北大核心 2024年第10期81-90,共10页
针对银精矿极具回收价值及现有处理工艺不足,以湿法炼锌过程产出的含锗银精矿为研究对象,提出了浓硫酸熟化—氧压酸浸的工艺路线,重点研究了工艺过程原理、含锗银精矿熟化—氧压酸浸过程中Zn、Cu、Ge的浸出行为及浸出渣中物相演变规律... 针对银精矿极具回收价值及现有处理工艺不足,以湿法炼锌过程产出的含锗银精矿为研究对象,提出了浓硫酸熟化—氧压酸浸的工艺路线,重点研究了工艺过程原理、含锗银精矿熟化—氧压酸浸过程中Zn、Cu、Ge的浸出行为及浸出渣中物相演变规律。结果表明:浓硫酸熟化预处理可氧化分解含锗银精矿中低价金属硫化物及精矿表面残留的有机药剂;在高温氧化性条件和Fe^(3+)/Fe^(2+)变价离子对的助浸作用下,物相组成由含锗银精矿中的铁闪锌矿、闪锌矿、雌黄铁矿、氯化亚铜为主演变为浸出渣中单质硫、硫酸铅、铁矾(MeFe_(3)(SO_(4))_(2)(OH)_(6),Me:1/2Pb、Na、K)为主。最佳氧压酸浸条件为:反应温度150℃、初始酸度150 g/L、反应时间180 min、氧分压0.6 MPa、液固比7 mL/g,Zn、Cu、Ge的浸出率分别为95.34%、98.47%和84.35%,铅、银分别富集至3.19%和7074 g/t,实现了Zn、Cu、Ge的深度浸出和铅、银的高效富集。 展开更多
关键词 含锗银精矿 浓硫酸熟化 氧压酸浸 浸出率
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钛石膏不同方法制备的Ⅱ型硬石膏对硫铝酸盐水泥性能影响
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作者 管学茂 张紫涵 +1 位作者 狄红丰 刘松辉 《河南理工大学学报(自然科学版)》 CAS 北大核心 2024年第2期194-200,共7页
目的为促进工业固废钛石膏资源再利用,了解硬石膏对硫铝酸盐水泥熟料性能的影响,方法以钛石膏为原料,采用加压水热法和酸浸法合成Ⅱ型硬石膏,研究不同方法合成的硬石膏对硫铝酸盐水泥熟料性能的影响。结果加压水热法和酸浸法合成的硬石... 目的为促进工业固废钛石膏资源再利用,了解硬石膏对硫铝酸盐水泥熟料性能的影响,方法以钛石膏为原料,采用加压水热法和酸浸法合成Ⅱ型硬石膏,研究不同方法合成的硬石膏对硫铝酸盐水泥熟料性能的影响。结果加压水热法和酸浸法合成的硬石膏因合成方法不同,对粒径、形貌、孔隙和表面积等微观性能影响也不同;在硫铝酸盐水泥熟料中添加不同方法合成的硬石膏或天然硬石膏,且不同种类的硬石膏掺量为15%时,硫铝酸盐水泥熟料的抗压强度均达到最大值;随着养护时间延长,硫铝酸盐水泥熟料的抗压强度均明显提高;与掺入天然硬石膏相比,掺入酸浸法合成硬石膏的抗压强度较低,但在硬石膏相同掺量和相同水化时间下,掺入加压水热法合成的硬石膏的硫铝酸盐水泥熟料的抗压强度均高于掺入其他两种硬石膏的。结论加压水热法合成硬石膏在水泥熟料中应用前景广阔,是钛石膏再利用的重要途径。 展开更多
关键词 钛石膏 加压水热法 酸浸法 Ⅱ型硬石膏 硫铝酸盐水泥熟料 抗压强度
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富钴铜冶炼渣预浸—氧压浸出工艺研究 被引量:2
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作者 李硕夫 朱景和 《有色金属(冶炼部分)》 CAS 北大核心 2024年第5期34-38,共5页
铜冶炼过程中产生的冶炼渣含有较多的铜、钴等有价金属,从冶炼渣中回收这些有价金属具有重要经济价值和环保意义。以Cu含量8.26%、Co含量1.52%的富钴铜冶炼渣为原料,采用预浸——氧压浸出工艺对其进行处理。系统考察了酸矿比、反应温度... 铜冶炼过程中产生的冶炼渣含有较多的铜、钴等有价金属,从冶炼渣中回收这些有价金属具有重要经济价值和环保意义。以Cu含量8.26%、Co含量1.52%的富钴铜冶炼渣为原料,采用预浸——氧压浸出工艺对其进行处理。系统考察了酸矿比、反应温度、反应时间、氧分压、液固比对Co、Cu、Fe浸出率浸出效果的影响,得出最佳工艺条件为:液固比3、反应温度230℃、反应时间1.5 h、酸矿比350 kg t、磨矿细度—0.074 mm占75%、氧分压0.2 MPa,在该条件下,Co、Cu、Fe浸出率分别达到98.38%、95.34%和2.07%。相较于常压浸出,该工艺能有效降低酸耗和浸液中铁离子浓度。 展开更多
关键词 富钴铜冶炼渣 预浸 氧压酸浸 回收
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红土镍矿加压浸出高压釜结垢机理
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作者 赵泽森 陈杰 +1 位作者 王晨晔 李会泉 《中国有色金属学报》 EI CAS CSCD 北大核心 2024年第11期3766-3774,共9页
加压酸浸技术是目前在红土镍矿镍钴提取工业上应用最为广泛的湿法提取技术,具有能耗低、碳排放量少、镍钴回收率高等优点。但在红土镍矿加压酸浸时,高压釜易结垢导致其有效容积减小、釜内流体流型改变、管线堵塞。为了明晰红土镍矿加压... 加压酸浸技术是目前在红土镍矿镍钴提取工业上应用最为广泛的湿法提取技术,具有能耗低、碳排放量少、镍钴回收率高等优点。但在红土镍矿加压酸浸时,高压釜易结垢导致其有效容积减小、釜内流体流型改变、管线堵塞。为了明晰红土镍矿加压酸浸高压釜结垢生成机理,本文通过化学分析、MLA矿物自动定量分析系统、扫描电镜等手段对高压釜结垢的矿物组成、主要矿物颗粒、元素赋存状态、嵌布特征和粒度分布等矿物学特征进行了研究。结果表明:高压釜结垢主要以水合硫酸铝为骨架,包裹红土镍矿浸出渣中的赤铁矿、铬铁矿等矿相形成。镍、钴、锰、镁等金属元素通过吸附进入高压釜结垢,其中镍和钴主要是被含铁矿相吸附。 展开更多
关键词 红土镍矿 湿法冶金 加压浸出 结垢 高压釜
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褐铁型红土镍矿硫酸高压浸出矿物结构变化
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作者 吴集耀 马保中 +1 位作者 陈永强 王成彦 《有色金属(冶炼部分)》 CAS 北大核心 2024年第10期58-66,共9页
菲律宾某矿区典型褐铁型红土镍矿的工艺矿物学分析表明,矿样中主要的矿物为针铁矿、铬尖晶石、石英及其他黏土质矿物,镍、钴主要赋存在铁矿物中。基于矿物特性,选择采用硫酸高压浸出工艺对该矿物进行处理,在100 g矿酸用量29 g、温度250... 菲律宾某矿区典型褐铁型红土镍矿的工艺矿物学分析表明,矿样中主要的矿物为针铁矿、铬尖晶石、石英及其他黏土质矿物,镍、钴主要赋存在铁矿物中。基于矿物特性,选择采用硫酸高压浸出工艺对该矿物进行处理,在100 g矿酸用量29 g、温度250℃、液固比3 mL/g、反应时间30 min的条件下,镍、钴浸出率均超过95%,铁浸出率低于1%,实现了镍、钴的选择性浸出。浸出渣的工艺矿物学分析表明,浸出过程中,原矿中的针铁矿矿相被破坏,赋存在其中的镍、钴被浸出进入溶液,未被浸出的镍、钴赋存于铬尖晶石中,这是镍、钴浸出不完全的主要原因。浸出渣中主要的含硫物相是铝水解生成的明矾石和铁水解夹带的部分硫酸镁等硫酸盐,二者均与铁矿物结合较紧密。 展开更多
关键词 红土镍矿 工艺矿物学 硫酸高压浸出
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