嗜热金属球菌对镍钼矿的浸出

Leaching of nickel-molybdenum sulfide ores with Metallosphaera sedula

对嗜热金属球菌(Metallosphaera sedula)浸出镍钼硫化矿进行了研究,以探求高效可持续的生物冶金方法.结果表明:有菌组镍的浸出率均在91%以上,而无菌组为77.64%;以亚铁为能源培养的驯化菌组镍和钼的浸出率分别为96.56%和65.43%,非驯化菌组为94.37%和60.20%;起始pH为2时浸出组镍浸出率达97.55%,钼浸出率为62.97%;粒径小于0.048mm和小于0.077mm的浸样镍浸出率分别为97.58%和95.37%,钼浸出率分别为64.46%和59.54%;低矿浆质量浓度比高矿浆质量浓度的浸出率高,5g.L-1矿浆镍和钼的浸出率分别达98.67%和81.87%;在无菌条件下,浸样添加0.5g.L-1Fe3+和对照组镍浸出率分别为91.19%和77.64%,钼浸出率为52.25%和50.19%;透析浸出率比非透析浸出率低;金属球菌浸出组比氧化亚铁硫杆菌浸出组的浸出率高,前者镍和钼浸出率分别为94.01%和64.74%,后者仅为67.77%和38.16%.

The bioleaching of nickel-molybdenum sulfide ores with the thermophilic and acidophilic lithotroph, Metallosphaera sedula, with shaking flasks was studied in order to probe a more efficient and sustainable biometallurgical way. The result shows that the leaching rate of Ni with MetaUosphaera sedula was all more than 91%, but that in the groups without Metallosphaera sedula was 77.64 %. The leaching rates of Ni and Mo in the groups with adapted Metallosphaera sedula cultured with Fe^2＋ were 96.56 % and 65.43 %, those in the groups with unadapted Metallosphaera sedula 94.37 % and 60.20 %, respectively. The leaching rates of Ni and Mo in the groups when the initial pH was 2 were 97.55 % and 62.97 % respectively. The leaching rates of Ni in the groups with the sizes less than 0.048 mm and 0.077 mm were 97.58% and 95.37%, while the leaching rates of Mo were 64.46% and 59.54 %. The leaching rates of Ni and Mo in the groups with an ore mass concentration of 5 g· L^-1 were higher than the more ore content and reached 98.67% and 81.87% respectively. In the groups with 0.5 g· L^-1 Fe^3＋ added and the contrast group without Metallosphaera sedula, the leaching rates of Ni were 91.19% and 77.64% respectively, while those of Mo were 52.25% and 50.19%. The leaching rates of Ni and Mo in the dialyzing group were lower than those of the undialyaing group. The leaching rates of Ni and Mo in the groups with MetaUosphaera sedula were 94.01% and 64,74% respectively, while just 67.77% of Ni and 38.16% of Mo were leached out in the groups with AcMthiobacillus ferrooxidans.