The waste aluminum electrolyte contains 7%Li.The lithium recovery process includes pyrometallurgical process and wet process.The pyrometallurgical process is mainly used for the pretreatment of waste aluminum electrolyte.The wet process enriches lithium into the leaching solution by leaching and prepares lithium salt.The traditional leaching technology includes sulfuric acid leaching,nitric acid leaching,alkali leaching,etc.The main purpose of producing lithium carbonate,and part of the technical routes,realizing the comprehensive recovery of valuable components of waste aluminum electrolyte.On the basis of the traditional leaching technology route,there are also innovative technologies such as pyrometallurgical and hydrometallurgical combination,alkali-acid leaching combination,inorganic salt or organic acid leaching.Analysis of waste lithium-containing aluminum electrolyte comprehensive recovery technology research trend,it can be seen that hydrometallurgical process dominated,pyrometallurgical treatment can only be used as pretreatment to achieve further hydrometallurgical leaching,the operating environment and production conditions of hydrometallurgical leaching are more friendly,although widespread long process,process is more complex,but can realize comprehensive recovery of Li,F,Al valuable components.The advantages and disadvantages of various treatment processes and the challenges faced by engineering application are introduced.It is pointed out that the technical route based on operability,economy and maximum recovery of other valuable components in waste aluminum electrolyte has more practical significance while recovering lithium by leaching.
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