A pyrite concentrate containing about 50% sulfur was obtained after the pyrite containing low-grade gold being subjected to reflotation. Then after two-stage roasting for removing arsenic and sulfur, a pyrite slag graded 0.056% As, 61% Fe was obtained with higher-grade gold and silver. An experiment on such slag being pretreated with dilute sulfuric acid followed by thiourea gold-leachlng showed the following results: at a grind size of -0.074 mm 60% , with pH of 1 ~2, liquid-solid ratio of 1:2, leaching time of 6 h, thiourea and ferric sulfate dosage of 10 g/L and 3 g/L, respectively, leaching rate of gold was up to 90.4%.%对含低品位金的硫精矿进行再选,获得含硫50％左右的再选硫精矿;对再选硫精矿进行二段焙烧除砷脱硫,可以获得含砷0.056％、含铁61％左右的烧渣,且其中金、银得以富集;对烧渣进行了稀硫酸预处理-硫脲浸金试验,浸金试验结果表明,当磨矿粒度为-0.074 mm粒级占60％,矿浆pH=1～2,液固比为1∶2,硫脲用量为10 g/L,硫酸铁用量为3g/L,浸出时间为6h时,金的浸出率达90.4％.
展开▼
