氧化亚铁硫杆菌浸出废旧锂离子电池的工艺条件

考察了接种量、振荡条件、浸出液以及电池原料对氧化亚铁硫杆菌浸出废旧锂离子电池的影响.研究结果表明,浸出10 d,钴浸出率达到48.5%,之后,浸出率不再增加;当接种量在2.5%—12.5%之间时,钴浸出率在第10天都为47.6%,接种量对浸出率无影响;振荡过程中控制温度为35℃时,钴浸出率最佳,并随着振荡速率的升高而增加;浸出液中加入硫磺对浸出影响不大,初始pH值在1.5—2.5范围内,都适合钴酸锂的浸出,而初始亚铁离子浓度在45 g.L-1条件下浸出效果最好;选择固液比为3%最佳,并且钴酸锂粉末的粒度大小对浸出率无影响.

Optimization conditions of bioleaching spent lithium-ion batteries by thiobacillus ferrooxidans

The effects of inoculums,shake speed,leaching solution and raw materials on the bioleaching spent lithium-ion batteries by Thiobacillus ferrooxidans were investigated.Experiment results indicated that the cobalt leaching rate was 48.5% on the 10th day,and then did not increase any more.When the inoculums were varied from 2.5% to 12.5%,the leaching rate was almost 47.6%,so the leaching process related little with inoculums.Best leaching results were achieved at 35 ℃.Besides,leaching rates were increased with the shake speed.No obvious influence was observed when sulfur was added to the leaching solution,and it was suitable for bioleaching when the initial solution pH was from 1.5 to 2.5.Also the best leaching result was achieved with 45 g · L-1 ferrous ion.The pulp density at 3% was most suitable for bioleaching,but the pulp size has no effect on the leaching process.