Method for extracting lithium from spent aluminum electrolyte and carbon residue and co-producing sodium aluminum fluoride and hydrogen oxide

The hydrometallurgical process for extracting lithium from waste aluminum electrolyte and carbon slag and co-producing aluminum hydroxide and sodium fluoride has solved the problem of unrecovered lithium resources and achieved efficient resource recovery and environmentally friendly multi-element recycling.

CN122380418APending Publication Date: 2026-07-14河南新天力循环科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
河南新天力循环科技有限公司
Filing Date
2026-04-17
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

The lithium resources in waste aluminum electrolytes and carbon slag are not effectively recycled and utilized, resulting in resource waste and environmental pollution. Furthermore, excessively high lithium content affects the lifespan of electrolyzers and energy consumption.

Method used

A combined pyrometallurgical process is used to extract lithium from waste aluminum electrolyte and carbon slag and produce sodium aluminum hydroxide fluoride. The process includes steps such as crushing, flotation, roasting, leaching, impurity removal and crystallization, extracting each element step by step to achieve efficient resource recovery.

Benefits of technology

It has achieved efficient recycling and utilization of elements such as lithium, fluorine, and aluminum, producing recyclable sodium fluoride and high-purity lithium carbonate products, reducing environmental pollution and improving resource utilization.

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Abstract

The present application provides a method for extracting lithium from waste aluminum electrolyte and carbon residue and co-producing sodium aluminum fluoride and hydrogen peroxide, which combines and processes the carbon residue and aluminum electrolyte of aluminum industry waste, adopts a combined process of dry and wet methods, and produces sodium fluoride by volatilizing fluorine through calcination, which can be recycled in aluminum electrolysis enterprises; aluminum is made into fire retardant aluminum hydroxide, sodium sulfate is made into ammonium sulfate fertilizer and sodium carbonate, and sodium carbonate is used for the synthesis of sodium fluoride. The whole process extracts each element step by step and has high yield, and truly realizes the recycling of multiple elements.
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