用酸浸—生物浸出工艺从废锂离子电池电极材料中回收金属钴铜镍

摘要

A bacterial strain ESY06 with the properties of high efficiency and high tolerant metals, identified as Thiobacillus ferrooxidans (T.f.), was obtained by isolating and long term cultivating.The bioleaching of the copper, cobalt and nickel in spent lithium ion batteries using strain ESY06 were investigated.And the effect of Fe2+concentration on the growth of a strain ESY06 was examined.The results show that the tolerant ability of the strain ESY06 to copper, cobalt and nickel are respectively1.22、2.21 and 0.29g/L.Under the condition of Fe2+concentration of 20g/L, the growth of the strain ESY06 is the best.The leaching rate of cobalt and nickel in positive electrode can reach 99.93％ and99.46％, respectively, and the leaching rate of copper in negative electrode is 99.78％.For the mixed electrodes, the leaching rate of copper, cobalt and nickel are 99.88％, 99.39％and 99.55％, respectively.The combined process of acid leaching pre-treated and bioleaching has good effect on leaching of copper, cobalt and nickel, and can recovery the valuable metals in battery electrode materials.%研究了采用长期筛选驯化得到的一株金属耐受能力较强的氧化亚铁硫杆菌 (T.f.) ESY06, 以酸浸—生物浸出工艺从废锂离子电池电极材料中回收铜、钴、镍, 考察了Fe2+质量浓度对ESY06生长的影响.结果表明:ESY06同时对铜、钴、镍的耐受能力分别为1.22、2.21、0.29g/L;Fe2+质量浓度为20g/L时, ESY06生长状况最好;采用酸浸—生物浸出工艺处理废锂离子电池正极材料, 钴、镍浸出率分别为99.93％、99.46％, 负极材料中的铜浸出率为99.78％, 混合电极材料中的铜、钴、镍浸出率分别为99.88％、99.39％、99.55％.酸浸—生物浸出工艺对铜、钴、镍金属回收效果较好, 对于从电池电极材料中回收有价金属有一定优势.