Secondary aluminium electrolyte and maturing treatment method thereof

Abstract

The invention relates to secondary aluminum electrolyte and a method for processing the secondary aluminum electrolyte through maturing. The method is characterized in that the method comprises the following steps of: extracting valuable components such as alumina, aluminun fluoride and sodium fluoride in the process residue which is produced in the aluminum electrolyte production process through adopting an electrochemical mode, separating impurity components, preparing the secondary aluminum electrolyte; processing the secondary aluminum electrolyte through maturing, and obtaining the aluminum electrolyte product with qualified quality. The regeneration principle which is adopted by the invention is to utilize the differences of the concentration and the decomposition voltage of different materials at certain temperature; a high temperature electrochemistry reaction mode is adopted to extract the valuable components in aluminum electrolyte residue and to extract impurity components; the maturation principle is as follows: the reaction velocity is controlled, chemical compositions of the product are adjusted and water in the product is removed through adding additive and catalyst at certain temperature, thereby the volatility of the electrolyte in the using process can be alleviated. The secondary aluminum electrolyte and the method have the advantages that the resources are saved, the environmental pollution is avoided, and the regeneration quality and the using effect of the residue can be guaranteed.

Description

technical field [0001] The invention belongs to the field of electrolytic aluminum production, and in particular relates to a recycled aluminum electrolyte and an aging treatment method thereof. Background technique [0002] Aluminum electrolytic production will produce a large amount of process waste, which contains valuable components such as alumina, aluminum fluoride, sodium fluoride, etc. that can be recycled. These components are the main components of industrial aluminum electrolytes. Many aluminum electrolysis plants discharge these process wastes as solid waste residues, which wastes resources and pollutes the environment. There are also some aluminum electrolysis factories that directly return some process waste (such as floor materials, trench cleaning materials, aluminum suction table package cleaning materials, scrap aluminum electrolytic cell bottom, etc.) to aluminum electrolytic production for use, but the impurities in them will affect aluminum electrolytic...

AI Technical Summary

Problems solved by technology

Many aluminum electrolysis plants discharge these process wastes as solid waste, which wastes resources and pollutes the environment

There are also some aluminum electrolysis factories that directly return some process waste (such as floor materials, trench cleaning materials, aluminum suction table package cleaning materials, scrap aluminum electrolytic cell bottom, etc.) to aluminum electrolytic production for use, but the impurities in them will affect aluminum electrolytic production The technical and economic indicators and the quality of electrolytic aluminum have a great negative impact, and the direct utilization effect is very poor