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
Dating of lead-zinc deposits is of critical importance for better understanding of ore genesis, but has long been a big challenge due to the lack of suitable minerals that can be unequivocally linked to the ore genesi...Dating of lead-zinc deposits is of critical importance for better understanding of ore genesis, but has long been a big challenge due to the lack of suitable minerals that can be unequivocally linked to the ore genesis and that can be used for tradition radiometric methods. This kind of deposits have simple mineralogy dominated by galena and sphalerite commonly associated with calcite and other gangue minerals. Both galena and sphalerite have low and high variable Re concentrations and thus Re-Os dating of these minerals have been less promising. In addition, the recovery of Re is extremely low for galena when conventional method was applied, lending additional difficulty in precisely dating galena. In this study, we investigate the recovery of Re using different media for anion exchange separation and reporte a revised preparation method for Re-Os dating of galena and sphalerite. By using the new protocol, two reliable Re-Os isochron ages of galena and sphalerite from the Fule（20.4±3.2 Ma） and Laochang（308±25 Ma） Pb-Zn deposits in Yunnan Province, SW China, are achieved.展开更多
针对高硅锌精矿焙烧过程中焙砂可溶硅高、沸腾炉易结块、浸出固液分离困难等问题,以现场生产焙烧工艺参数为基础,研究了低温和高温焙烧对焙砂中可溶硅含量的影响,并基于MatCal软件对沸腾炉焙烧工艺进行热平衡计算。结果表明:在焙烧条件...针对高硅锌精矿焙烧过程中焙砂可溶硅高、沸腾炉易结块、浸出固液分离困难等问题,以现场生产焙烧工艺参数为基础,研究了低温和高温焙烧对焙砂中可溶硅含量的影响,并基于MatCal软件对沸腾炉焙烧工艺进行热平衡计算。结果表明:在焙烧条件基本相同的情况下,随着硫化锌精矿焙烧温度的增加,焙砂中的可溶硅也增加。当焙砂中可溶硅高于3.18%会出现浓密机上清液跑混、低浸浓密底流矿浆过滤困难、净液中除杂钴偏高等问题。经MatCal模拟计算后,理论消耗空气50361.328 m 3/h,低温焙烧的平均风量47102.8 m 3/h,高温焙烧平均风量48005.7 m 3/h,实际的焙烧中平均风量偏低,需要增加沸腾炉的风料比。展开更多
以硫化锌精矿为研究对象,采用富氧-硫酸浸出的方式提取矿物中的锌元素并使硫元素以单质的形态进入浸出渣中,考察浸出粒度、温度、初酸浓度、氧分压对酸浸过程动力学的影响。研究结果表明:硫化锌精矿的浸出过程由表面化学反应控制,反应遵...以硫化锌精矿为研究对象,采用富氧-硫酸浸出的方式提取矿物中的锌元素并使硫元素以单质的形态进入浸出渣中,考察浸出粒度、温度、初酸浓度、氧分压对酸浸过程动力学的影响。研究结果表明:硫化锌精矿的浸出过程由表面化学反应控制,反应遵循"未反应核收缩模型"的表面化学反应控制的动力学规律,其反应活化能E=73.58 k J/mol。展开更多
介绍了一种从硫化锌精矿浸出渣中回收硫磺的方法。以硫化铵溶液作为提取液,采用硫化铵溶液浸取矿渣,矿渣中的硫可生成多硫离子而溶解转入溶液中,抽滤分离出滤液,将所产生的气体导出并加以吸收,可返回循环使用;滤液进行热分解可得高纯硫...介绍了一种从硫化锌精矿浸出渣中回收硫磺的方法。以硫化铵溶液作为提取液,采用硫化铵溶液浸取矿渣,矿渣中的硫可生成多硫离子而溶解转入溶液中,抽滤分离出滤液,将所产生的气体导出并加以吸收,可返回循环使用;滤液进行热分解可得高纯硫磺产品。多硫化物的生成实验条件如下:硫化铵溶液浓度4.0 mol/L;液固比11 mL/g;浸出时间45 m in,室温。多硫化物分解实验条件为:反应温度353 K,分解时间120 m in。选择硫化铵溶液提取锌精矿浸出渣中的硫,相关工艺设备及提硫操作简单,对环境不易造成伤害,反应条件也易于控制,提取液可返回循环使用,硫的总回收率可达96%以上,具有一定的优越性。展开更多
基金Project(20050145029)supported by the Research Fund for the Doctoral Program of Higher Education of ChinaProject(2005221012)supported by Science and Technology Talents Fund for Excellent Youth of Liaoning Province,China
文摘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%.
基金supported by the National Natural Science Foundation of China(No.52264026)the Ten Thousand Talent Plans for Young Top-notch Talents of Yunnan Province,China(No.YNWR-QNBJ-2018-051).
基金supported by the 12th Five-Year Plan Projects of State Key Laboratory of Ore Deposit Geochemistry, Chinese Academy of Sciences (Nos. SKLODG-ZY125-09, SKLODG-ZY125-02)the National Natural Science Foundation of China (Nos. 41373064, 41102053 and 41163001)the Science and Technology Plan Project of Yunnan Province (No. 2009CD029)
文摘Dating of lead-zinc deposits is of critical importance for better understanding of ore genesis, but has long been a big challenge due to the lack of suitable minerals that can be unequivocally linked to the ore genesis and that can be used for tradition radiometric methods. This kind of deposits have simple mineralogy dominated by galena and sphalerite commonly associated with calcite and other gangue minerals. Both galena and sphalerite have low and high variable Re concentrations and thus Re-Os dating of these minerals have been less promising. In addition, the recovery of Re is extremely low for galena when conventional method was applied, lending additional difficulty in precisely dating galena. In this study, we investigate the recovery of Re using different media for anion exchange separation and reporte a revised preparation method for Re-Os dating of galena and sphalerite. By using the new protocol, two reliable Re-Os isochron ages of galena and sphalerite from the Fule（20.4±3.2 Ma） and Laochang（308±25 Ma） Pb-Zn deposits in Yunnan Province, SW China, are achieved.
文摘针对高硅锌精矿焙烧过程中焙砂可溶硅高、沸腾炉易结块、浸出固液分离困难等问题,以现场生产焙烧工艺参数为基础,研究了低温和高温焙烧对焙砂中可溶硅含量的影响,并基于MatCal软件对沸腾炉焙烧工艺进行热平衡计算。结果表明:在焙烧条件基本相同的情况下,随着硫化锌精矿焙烧温度的增加,焙砂中的可溶硅也增加。当焙砂中可溶硅高于3.18%会出现浓密机上清液跑混、低浸浓密底流矿浆过滤困难、净液中除杂钴偏高等问题。经MatCal模拟计算后,理论消耗空气50361.328 m 3/h,低温焙烧的平均风量47102.8 m 3/h,高温焙烧平均风量48005.7 m 3/h,实际的焙烧中平均风量偏低,需要增加沸腾炉的风料比。
文摘以硫化锌精矿为研究对象,采用富氧-硫酸浸出的方式提取矿物中的锌元素并使硫元素以单质的形态进入浸出渣中,考察浸出粒度、温度、初酸浓度、氧分压对酸浸过程动力学的影响。研究结果表明:硫化锌精矿的浸出过程由表面化学反应控制,反应遵循"未反应核收缩模型"的表面化学反应控制的动力学规律,其反应活化能E=73.58 k J/mol。
文摘介绍了一种从硫化锌精矿浸出渣中回收硫磺的方法。以硫化铵溶液作为提取液,采用硫化铵溶液浸取矿渣,矿渣中的硫可生成多硫离子而溶解转入溶液中,抽滤分离出滤液,将所产生的气体导出并加以吸收,可返回循环使用;滤液进行热分解可得高纯硫磺产品。多硫化物的生成实验条件如下:硫化铵溶液浓度4.0 mol/L;液固比11 mL/g;浸出时间45 m in,室温。多硫化物分解实验条件为:反应温度353 K,分解时间120 m in。选择硫化铵溶液提取锌精矿浸出渣中的硫,相关工艺设备及提硫操作简单,对环境不易造成伤害,反应条件也易于控制,提取液可返回循环使用,硫的总回收率可达96%以上,具有一定的优越性。
