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Spencer 等人已在含砷多至17wt%金精矿的连续生物氧化中使用适度的耐热混合细菌培养。这种细菌培养45℃下可生长并促进生物氧化反应,同时适应于达到25g/1可溶砷的浓度。最初产生的砷(Ⅲ)(亚砷酸盐)被氧化成砷(V)(砷酸盐(;这就使得可以以砷酸铁沉淀的形式排除砷,它比起砷(Ⅲ)产物在环境上更易被接受。一种实验室规模的连续试验系统已以15%(wt/vol)固体运转一年以上,其中产生的残渣已有90%以上的金被分离出来。中间型工厂也已运转几个月并产生相似的结果。
Spencer et al. Have been cultured using moderate heat-resistant mixed bacteria in continuous bio-oxidation of up to 17 wt% gold concentrate containing arsenic. This bacterium culture grows at 45 ° C and promotes biooxidation while being adapted to achieve a concentration of 25 g / 1 soluble arsenic. The arsenic (III) that was originally produced (arsenite) is oxidized to arsenic (V) (arsenate; this makes it possible to exclude arsenic from precipitating iron arsenate, which is less toxic than arsenic (III) Is more acceptable. A laboratory-scale continuous testing system has been running at 15% (wt / vol) solids for more than a year, with more than 90% of the gold being produced from the residue being produced. A few months and produce similar results.