某铜矿尾矿渣微生物柱浸及其动力学

采用两段微生物柱浸对某铜矿尾矿渣中的有价金属进行二次回收研究。考察预处理酸度、接种量、尾矿和废石装矿方式及废石粒度等因素对铜、锌浸出的影响。结果表明,两段微生物柱浸无论改变接种量还是预处理酸度,尾矿最终铜离子浸出率均大于30%,在预处理酸度为5%、接种量10%、-2 mm废石粒级的条件下,铜浸出率可达到38.8%,锌浸出率可达到87.45%。不同的装矿方式浸出差异性不大,分层装尾矿和采场废石并不能有效改善柱子的渗透性。柱浸体系中铜锌浸出动力学模型表明,铜、锌的浸出符合内扩散控制模型。

Column Bioleaching of Tailings from Copper Mine and Its Leaching Kinetics

Valuable metals were recovered from tailings of a copper mine by two-stage column bioleaching. Effects of pretreatment acidity, inoculation quantity, loading mode of tailing and waste rock, and particle size of waste rock on copper and zinc leaching were investigated. The results show that copper leaching rate is 30% above regardless of change of inoculation amounts and pretreatment acidity. Leaching rate of copper and zinc is 38.8% and 87.45% respectively under the conditions including pretreatment acidity of 5% dilute sulfuric acid, inoculation of 10%, and particle size of waste rock of -2 mm. Permeability of column is not effectively improved by different loading methods. The results of kinetics models of copper and zinc leaching in column leaching system show that leaching of copper and zinc accords with internal diffusion control model.