针铁矿法从铜钴矿生物浸出液中除铁的研究

采用针铁矿法除去萃铜后的铜钴矿细菌浸出液中的铁,并对除铁时的pH、氧化剂浓度、氧化时间、保温时间等因素进行优化。结果表明,控制氧化过程中pH为4.0、氧化温度70℃、保温时间1h、氧化剂浓度8%,除铁率和钴回收率分别为99.9%和99.5%。针铁矿法除铁可在常压和较低温度(70℃)下进行,而且不需外加其他金属阳离子就能获得过滤性能良好且可作为含铁富矿使用的沉淀渣。

Study on Goethite Deironization from Bioleaching Solution of Cu-Co Ore

The iron was removed from Cu-Co ore bioleaching solution after copper extraction with goethite process.The parameters of pH value,concentration of oxidant,oxidation time and deironization time were optimized.The results show that the iron removal rate and cobalt recovery rate are 99.9% and 99.5% respectively under the optimum conditions including pH of 4.0,oxidation temperature of 70 ℃,holding time of 1 h,and concentration of oxidant of 8%.The goethite deironization process can be conducted at atmospheric pressure,low temperature(70 ℃) and without addition of other metal ions.The precipitation slag is rich of iron and has good filterability.