金属硫化物矿物生物浸出过程中Fe3+的作用

摘要

研究了氧化亚铁硫杆菌(简称T.f菌)对金属硫化物矿物生物浸出过程中Fe3+的作用．结果表明,在浸出的初始阶段,Fe3+的化学氧化作用是主要的;但在整个金属浸出过程中,Fe3+的化学氧化作用是很有限的;Fe3+对T.f菌有一定的抑制作用,降低了它们对液相中Fe2+的氧化能力;Fe3+及其沉淀使细菌在固体矿物颗粒表面的吸附量减少,降低了吸附细菌的活性,从而影响了细菌的直接氧化浸出作用．%The functions of ferric irons on the bioleaching of sulfide minerals using Thiobacillus ferrooxidans were discussed. In the initial stage of the bioleaching, when the bacteria are not active, the chemical oxidation of ferric irons to the solid sulfide minerals is primary; While in the whole course of the bioleaching, it is very limited; ferric irons inhibit the bacterial activity, lower the oxidational ability of the bacteria to ferrous irons in the liquid phase; ferric irons and their precipitations reduce the quantities of the attached bacteria and their activity, and have bad influence on the direct bioleaching action.