硫化叶菌对镍钼硫化矿的浸出作用

对金属硫叶菌浸出镍钼硫化矿进行了研究.结果表明,有菌组镍的浸出率均在90%以上,而无菌组为77.64%;驯化菌比非驯化菌的浸出率高,前者镍和钼的浸出率分别为94.7%和70.2%,后者为93.1%和68.4%;pH为2时浸出效果最佳,镍浸出率达100%,钼浸出率为66.97%;粒径<0.048mm和<0.077mm的浸样镍浸出率均达到100%,钼浸出率分别为68.4%和64.5%;低矿浆浓度比高矿浆浓度的浸出率高,5g/L矿浆镍和钼的浸出率分别达100%和87.29%;在无菌条件下,浸样添加0.5g/LFe3+和对照组的镍浸出率分别为92.8%和76.6%,钼浸出率为52.56%和49.34%;嗜热菌(金属硫叶菌)比常温菌(氧化亚铁硫杆菌)的浸出率高,前者镍钼浸出率分别为93.17%和73.52%,后者为67.34%和38.36%.

硫化钼镍矿加碱焙烧后钼镍的回收率分析

通过焙烧、水浸实现了原生硫化镍钼矿中镍和钼的分离,得到的较优工艺条件为:焙烧时,原矿和无水碳酸钠质量比1∶0.9、560℃焙烧6h,650℃焙烧1.5h,焙砂中镍品位为2.67%,钼品位为5.81%;在固液比1∶4,温度95℃的条件下,水浸焙烧渣2h,98.21%的镍留在滤渣中,95.43%的钼进入滤液,有效地实现了钼和镍的分离。

Extraction of molybdenum and nickel from roasted Ni-Mo ore by hydrochloric acid leaching, sulphation roasting and water leaching

To extract molybdenum and nickel from the roasted Ni-Mo ore, a process of hydrochloric acid leaching, sulphation roasting and water leaching was investigated. The results showed that this process could get a high leaching rate of Mo and Ni. Under the optimum conditions of hydrochloric acid leaching （roasted Ni-Mo ore leached with 0.219 mL/g hydrochloric acid addition at 65 ℃ for 30 min with a L/S ratio of 3 mL/g）, sulphation roasting （51.9% sulfiaric acid addition, roasting temperature 240 ℃ for 1 h）, followed by leaching with the first stage hydrochloric acid leaching solution at 95 ℃ for 2 h, the leaching rates of Mo and Ni reached 95.8% and 91.3%, respectively.