摘要
对某浮选银精矿采用氰化法、硫代硫酸盐法、硫脲法进行银浸出实验,以评估3种不同浸出方法对该银精矿浸出效果.研究结果表明:在最优的工艺参数下[氰化法:碱预处理后加入铵盐,氰化钠浓度0.15mol/L,pH值为11,液固比(浸出液体积与试样质量之比,单位是mL/g,下同)2∶1,搅拌强度500r/min,浸出时间为48h;硫代硫酸盐法:氧化焙烧预处理,氨水浓度1.0mol/L,硫酸铜浓度0.01mol/L,硫代硫酸钠浓度0.2mol/L,pH值为10,液固比4∶1,搅拌强度500r/min,浸出时间12h;硫脲法:氧化焙烧和稀硫酸预浸处理,Fe3+浓度7.5×10-3mol/L,硫脲浓度0.18mol/L,pH=1.0,液固比为3∶1,搅拌速度250r/min,浸出时间24h],硫代硫酸盐方法获得的Ag浸出率为78.58%,硫脲相应获得的Ag浸出率为62.43%,比氰化法获得的浸出率低约3.33%.
The leaching experiments are performed on samples collected from a silver concentrate with cyanide, thiosulfate and thiourea solutions respectively to compare their extraction effects. The result indicates that, under the optimal process parameters,（Cyanide： ammonium salt added on the pretreated alkali, sodium cyanide concentration being 0.15mol/L, pH value being 11, liquid-solid rate 2∶1, mixing strength 500r/min, leaching time 48h; Thiosulfate： oxidizing roasting pretreatment, ammonia concentration of 1.0mol/L, copper sulfate concentration of 0.01mol/L, sodium thiosulfate concentration of 0.2mol/L, p H of 10, liquid-solid rate of 4∶1, mixing strength of 500r/min, leaching time of 12h; Thiourea： oxidizing roasting and then dilute sulphuric pretreatment acid pre-leaching, Fe3 ＋concentration of 7.5 ×10^-3mol/L, thiourea concentration of 0.18mol/L, p H of 1.0, liquid-solid rate of 3∶1, mixing strength of 250r/min, leaching time of 24h], the leaching rate of Ag with the method of thiosulfate is 78.58 %, while the rate in the thiourea system is about 62.43 %, 3.33 % lower than that in the cyanide system.
出处
《有色金属科学与工程》
CAS
2015年第1期74-78,共5页
Nonferrous Metals Science and Engineering
基金
国家自然科学基金资助项目(51104077)
江西省科技支撑计划项目(2011BBG70002-2)
