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研究了Ag+对含砷金精矿生物浸出的影响,测量了浸出液中铁、银、砷浓度及氧化还原电位(Eh)的变化,考察了Ag+对细菌密度的影响,并对浸渣进行了光谱表征.结果表明,Ag+对含砷金精矿的生物浸出有一定的促进作用且在高浓度Fe3+条件下催化作用明显;低Ag+浓度下含砷金精矿的生物浸出率提高约10%,但Ag+浓度过高将影响细菌生长,导致浸出速率下降.Ag+催化含砷金精矿生物浸出是Ag+取代矿物表面的砷并生成Ag2S,之后被Fe3+氧化分解,重新产生Ag+,从而加速矿物的氧化分解.
The effects of Ag + on the bioleaching of arsenic-bearing gold concentrate were studied. The concentrations of iron, silver, arsenic and redox potential (Eh) in the leachate were measured. The effects of Ag + on the bacterial density were investigated. The results showed that Ag + promoted the bioleaching of arsenic gold concentrate and had obvious catalysis under the condition of high concentration of Fe3 +. The biological leaching rate of arsenic concentrate increased about 10% The concentration is too high will affect the growth of bacteria, resulting in the leaching rate decreased.Ag + catalytic arsenic gold concentrate bioleaching is Ag + instead of arsenic on the surface of minerals and the formation of Ag2S, followed by Fe3 + oxidative decomposition, regeneration Ag +, thereby accelerating the mineral oxidative decomposition.