微生物浸出金川露天剥离低品位镍矿

Bioleaching the Open Stripe Nickel Ore in Jinchuan Mine of China

  • 摘要: 进行了金川露天剥离镍矿的生物浸出实验.证明金川露天剥离镍矿有价金属的浸出是氧化亚铁硫杆菌直接浸出作用和自由菌产生的Fe3+间接浸出作用的联合;生长于液体培养基中和矿物表面硫杆菌化学行为的差异源于细菌表面存在蛋白质膜;浸出速率和菌种氧化活性受吸附在固相上和液相中细菌生长繁殖速率、矿浆质量浓度、pH值和Fe3+的影响:Fe3+的添加可影响菌种活性,抑制浸出的进行,且易在矿物表面产生沉淀,使浸出率降低.

     

    Abstract: Bioleaching experiments on the open stripe nickel ore in Jinchuan Mine of China were carried out. It is demonstrated that the leaching of nickel is combined bio-direct action with bio-indirect action. Thiobacillus ferrooxidans (TF) chemistry behavior difference between TF living in the culture medium and that living on the surface of the ore is based on the protein membrane which grows on the surface of TF. The Ni leaching rate and the oxidative activity of TF are influenced by the growth rate of TF adhered on the solid phase and free in the liquid phase, mineral mass density, Fe3+ concentration and pH consistency. Add on-ferric ion can interfere in the bacteria oxidative and inhibit the leaching of Ni, which lead to the formation of sediment on the surface of the mineral and reduce the leaching rate of Ni.

     

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