氧化亚铁硫杆菌促进金川铜镍硫化矿尾矿砂提取有价金属实验研究

金川铜镍硫化矿尾矿砂数量巨大,其中Ni、Cu和Co等有价金属种类较多,含量较为丰富,蕴含着巨大的经济价值。本文研究了氧化亚铁硫杆菌对金川铜镍尾矿砂提取有价金属效果的影响,在选取金川新尾矿库中心钻孔尾矿砂样品与氧化亚铁硫杆菌作用不同时间的基础上进行化学酸溶,利用电感耦合等离子体发射光谱仪(ICP-AES)分析了溶液中Cu²⁺、Ni²⁺、Co²⁺含量,并通过离子浸出率来表征微生物对尾矿中有价金属提取的影响效果。结果表明,尾矿砂直接化学酸溶后Cu²⁺、Ni²⁺浸出率分别为73.78%和69.87%,Co²⁺浸出率仅为39.57%;而氧化亚铁硫杆菌先与尾矿砂作用后再进行硫酸酸溶,其Cu²⁺、Ni²⁺总浸出率均可达到90%以上,Co²⁺总浸出率也可达到70%以上。实验结果证明氧化亚铁硫杆菌的参与促进了尾矿砂中Cu²⁺、Ni²⁺、Co²⁺的浸出。

The acceleration of the extraction of valuable metals from Jinchuan copper-nickel sulfide tailings by Acidithiobacillus ferrooxidans

The Jinchuan copper-nickel sulfide tailings are of large quantities and contain many Ni, Cu and Co valuable metals, suggesting great economic potentialities. A.f. was studied to reveal the effect of the microbial extraction of valuable metals. Samples were collected to interact with A.f. in different periods and then sulfuric acid chemical effects were conducted. The concentrations of Cu, Ni and Co were tested by Inductively Coupled Plasma Atomic Emission Spectrometer (ICP-AES) to characterize the capability of microbial extraction of valuable metals. The results showed that Cu²⁺, Ni²⁺ leaching rates of the tailings after direct chemical sulfuric acid effect were 73.78% and 69.87%, and Co²⁺ leaching rate was 39.57%. In 10 days'' interaction between the tailing samples and A.f., the total leaching rates of Cu²⁺, Ni²⁺ could reach over 80% and Co²⁺ total leaching rate could be up to 70%, which indicates that the involvement of A. f. can greatly facilitate Cu²⁺, Ni²⁺, Co²⁺ leaching of Jinchuan tailings.