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0.15 mol/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500 r/min，浸出时间为48 h；硫代硫酸盐法：氧化焙烧预处理，氨水浓度1.0 mol/L，硫酸铜浓度0.01 mol/L，硫代硫酸钠浓度0.2 mol/L，pH值为10，液固比4∶1，搅拌强度500 r/min，浸出时间12 h；硫脲法：氧化焙烧和稀硫酸预浸处理，Fe3+浓度7.5×10-3 mol/L，硫脲浓度0.18 mol/L，pH=1.0，液固比为3∶1，搅拌速度250 r/min，浸出时间24 h]，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 0.15 mol/L, pH value being 11, liquid-solid rate 2∶1, mixing strength 500 r/min, leaching time 48 h; Thiosulfate: oxidizing roasting pretreatment, ammonia concentration of 1.0 mol/L, copper sulfate concentration of 0.01 mol/L, sodium thiosulfate concentration of 0.2 mol/L, pH of 10, liquid-solid rate of 4∶1, mixing strength of 500 r/min, leaching time of 12 h;Thiourea:oxidizing roasting and then dilute sulphuric pretreatment acid pre-leaching, Fe3+ concentration of 7.5 ×10-3 mol/L, thiourea concentration of 0.18 mol/L, pH of 1.0, liquid-solid rate of 3∶1, mixing strength of 250 r/min, leaching time of 24 h], 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.
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