某难浸金矿的次氯酸钠浸出研究

Study on Leaching of Refractory Gold Ore with Sodium Hypochlorite

采用次氯酸钠对贵州某难浸金矿进行浸出,考察次氯酸钠浓度,浸出时间和温度对金浸出率的影响。结果表明,次氯酸钠不仅可氧化分解矿石中的FeAsS和FeS2,同时还可以打开包裹的金;在下述优化条件下,金浸出率可达到75%以上:次氯酸钠质量浓度0.6mol/L,pH 13～14,液固比6,35℃浸出4h。

One refractory gold ore in Guizhou Province was leached with sodium hypochlorite. The effects of concentration of sodium hypochlorite, leaching time and temperature on leaching rate of gold were investigated. The results show that sodium hypochlorite not only oxidizes FeAsS and FeS2 in gold ore, but also opens the encapsulated gold. The leaching rate of gold is above 75% under the following optimum conditions including concentration of sodium hypochlorite of 0.6 mol/L, pH of 13-14, ratio of liquid to solid of 6, leaching time of 4 h, and temperature of 35 ℃.