| Abstrakt: |
The acid leaching of copper and aluminum materials in spent lithium ion batteries with high copper leaching agent was studied. The competitive reaction mechanism of co-existing system of hydrogen ion and copper ion was discussed. The effects of hydrogen ion concentration on hydrogen evolution, heat production and acid leaching efficiency were investigated. The results show that the competitive reaction mechanism makes the high concentration hydrogen ions more efficient to leach copper and aluminum, and then improves the acid leaching efficiency. When the concentration of hydrogen ions in the high copper leaching agent increases to 0.7 mol/L, the total residual rate of nickel, cobalt, manganese and lithium in the pickling residue is 1.7 %, and the hydrogen concentration can be maintained within 4.5 mmol/L during the pickling process. The reaction is mild and the safety is high. After the acid leaching reaction, the mass concentration of copper ion in the high copper leaching agent is reduced from 15.54 g/L to 36 mg/L, the removal rate of copper ion is 99.7%, and the removal cost of copper in the leaching section can be reduced by 55 yuan/m³, which has certain economic benefits in actual production. [ABSTRACT FROM AUTHOR] |
