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据美国新墨西哥州立采矿和工艺学院的资料,该学院简要地研究了金湿法冶金中运用生物工艺的两个有发展前途的基本方向。第一,对难处理的含金黄铁矿和砷黄铁矿及精矿预先进行生物氧化处理,随后使用氰化物或硫脲从氧化产品中浸出金。主要使用氧化铁硫杆菌型化能营养微生物作为硫化物原料的生物氧化剂。此过程有代表性的参数是:持续时间15—20h;pH1.7;Eh600—760兆伏;温度28—30℃;Fe(2+)的氧化速度3—5g/L·h。难处理的金矿石进行预先生物处理,可使随后氰化处理过程中金回收率提高到90—95％;此流程正用于工业生产中。
According to the State of New Mexico’s State Institute of Mining and Technology, the institute briefly examines two promising directions for the use of biotechnology in gold hydrometallurgy. First, the refractory gold-bearing pyrite and arsenopyrite and concentrates are pre-oxidized, followed by the leaching of gold from the oxidized product using cyanide or thiourea. The main use of Thiobacillus ferrooxidans type can be nutritious microorganisms as a biological raw material of the oxidant. Representative parameters for this process are: Duration 15-20h; pH 1.7; Eh600-760 MV; Temperature 28-30 ° C; Fe (2+) oxidation rate 3-5 g / L · h. Pre-bioprocessing of refractory gold ores can result in a 90-95% recovery of gold from subsequent cyanidation processes; this process is being used in industrial production.