Abstract:The leaching behavior of lithium (Li), sodium (Na), aluminum (Al) and calcium (Ca) in waste aluminum electrolyte containing lithium was studied by changing the concentration of hydrochloric acid, reaction temperature, leaching time and liquid-solid ratio. In this study, it was found that the leaching rates of lithium (Li) and sodium (Na) were increased with the increase of parameters, while the leaching rates of aluminum (Al) and calcium (Ca) were very low and did not change much with the concentration of hydrochloric acid. When the influence of leaching time was investigated, the leaching rate of lithium (Li) first increased and then decreased, the leaching rate of sodium (Na) increased with time, and the leaching rates of aluminum (Al) and calcium (Ca) were low but increased with the extension of leaching time. When the influence of leaching temperature was investigated, the leaching rate of lithium (Li) first increased and then decreased, while the change of temperature had little effect on the leaching rates of sodium (Na), aluminum (Al) and calcium (Ca). When the influence of liquid-solid ratio was investigated, the leaching rate of lithium (Li) first increased rapidly with the increase of liquid-solid ratio and then reached the inflection point and tended to be stable, while the leaching rates of sodium (Na), aluminum (Al) and calcium (Ca) increased significantly with the increase of liquid-solid ratio. By changing and optimizing the leaching parameters, the leaching rate of lithium can reach 98%.