难浸高硫金精矿细菌预氧化—氰化浸出试验研究

Experimental Study on Pre-oxidization and Cyanide Carburizing of Refractory Gold Concentrate Containing High Sulphur Content

针对甘肃亚特含高硫难浸金精矿开展了生物预氧化一氰化浸出试验研究，考察了细菌预氧化过程中矿浆浓度、pH值、反应温度、磨矿细度和氧化时间等参数条件对浸出的影响，并对氧化后液进行回用处理。结果表明，在矿浆浓度为16％、pH值为1．2～1．4、反应温度为40℃、磨矿细度〈0．043mm占94．8％以上以及氧化时间为8d的条件下，采用细菌预氧化处理技术对矿样进行处理，硫氧化率达86．0％，金浸出率由直接氰化浸出率的23．4％提高到92．6％。

Biological oxidation-leaching experiments of refractory gold concentrate containing high sulfur was carried out.The relationships of leaching rate of gold with the process parameter of pulp density,pH value,the reaction temperature,grinding fineness,oxidation time were studied by experiment,and the oxidated liquid was under the reuse treatment.Under the optimal process conditions,including slurry concentration of 16% ,the pH value 1.2-1.4,the reaction temperature was 40 ℃ ,grinding fineness of less than 0.043 mm accounted for more than 94.8% ,the oxidation time condition for 8 days.The ore sample was dealed with the bacterial oxidation processing technology,the oxidation rate of sulfur reached 86.0% ,the leaching rate of gold was improved from 23.4% to 92.6%.