摘要
采用氧化焙烧 硫酸+次氯酸钙浸出工艺可从西北杏树坪地区的难选冶金矿石中回收金。试验考察了矿样粒度、焙烧温度、焙烧时间、搅拌间隔时间对矿石焙烧转化的影响,也考察了硫酸质量分数、用量,次氯酸钙用量及温度对金浸出率的影响。结果表明,矿样磨细至300目,在650 ℃下焙烧2 h后,用18%的硫酸,按m(焙砂)∶m(硫酸)=1∶3.5,m(焙砂)∶m(次氯酸钙)=100∶3配比,在60 ℃下浸出,金浸出率可达 98%。工艺中废水可循环使用,浸出渣可用于制取白水泥。
Gold can be recovered from refractory gold ore at Xingshuping, north-west by oxide roast-leaching with sulfuric acid+ calcium hypochlorite. The effects of sample size, roast temperature and time, agitation interval time on ore conversion are examined. The effects of sulfuric acid mass fraction and volume, calcium hypochlorite addition level, and temperature on gold leaching rate are also examined. Experimentation results show that gold leaching rate can reach to 98% when ore sample size is 300 mesh and roasted 2 h at 650 ℃, roasted product is leached with sulfuric acid of 18% under conditions of m(roasted product)∶m(sulfuric acid)=1∶3.5,m(roasted product)∶m(calcium hypochlorite)=100∶3 and temperature=60 ℃. Effluent can be cycled in process, waste residue can be used to make white cement.
出处
《湿法冶金》
CAS
2005年第1期12-16,共5页
Hydrometallurgy of China
