废锂电池中钴锂浸出率影响因素的全因子实验

为了最大化浸出废锂电池中钴锂金属元素，固定浸出时间，采用全因子实验方法，以氨基磺酸浓度、过氧化氢质量分数、固液比、浸出温度为自变量，Co2+和Li+浸出率为因变量进行模型拟合，应用Minitab 17软件对工艺参数模型进行预测，并对最佳工艺参数进行验证。结果表明，主效应上，氨基磺酸浓度、过氧化氢质量分数、固液比、浸出温度对Co2+和Li+浸出率有显著的影响；交互效应上，氨基磺酸浓度+固液比、过氧化氢质量分数+浸出温度对Co2+浸出率有明显的影响，氨基磺酸浓度+浸出温度、过氧化氢质量分数+浸出温度、固液比+浸出温度对Li+浸出率有一定影响，其余效应影响不显著。所得最佳工艺参数为:c(NH2SO3H)=144 mol·L-1，w(H2O2)=10%，S/L=25 g·L-1，θ=55 ℃，t=70 min，在此浸出条件下，Co2+和Li+浸出率分别为9531%和9236%。

Full Factorial Experimental Study on Influencing Factors of Li+ and Co2+ Leaching Efficiency from Spent Lithium Ion Batteries

  In order to maximize the leaching of lithium and cobalt from spent lithium batteries in an expected retention time,a full factorial experiment was adopted with the c(NH2SO3H),w(H2O2),S/L and θ as independent variables,the leaching rates of Co2+ and Li+ as dependent variables.The software Minitab17 was employed to predict the process parameters model,and verify the best process parameters.The results demonstrated that the main effects c(NH2SO3H),w(H2O2),S/L and θ had significant effects on the leaching efficiency of Co2+ and Li+;the interaction effects c(NH2SO3H)+S/L and w(H2O2)+θ had significant effects on the leaching efficiency of Co2+;the interaction effects c(NH2SO3h)+θ,w(H2O2)+θ and S/L+θ had no significant effects on the leaching efficiency of Li+.The optimum process parameters were as follows: c(NH2SO3H)=1.44 mol·L-1,w(H2O2)=10%,S/L=2.5 g·L-1,θ=55 ℃,t=70 min.Under these conditions,the leaching efficiencies of Co2+ and Li+ were 95.31% and 92.36%,respectively.