Resource treatment method for lithium-rich aluminum electrolyte

Abstract

The invention relates to a resource treatment method for a lithium-rich aluminum electrolyte. The method comprises the following steps: firstly performing heat treatment on the lithium-rich aluminum electrolyte to obtain a product A; performing leaching treatment on the roasting product A with a water-soluble inorganic salt as a leaching agent in water, and performing filtering to obtain a filter residue B and a filtrate B; adding an alkali or an aqueous solution of the alkali to the filtrate B to remove aluminum ions in the filtrate B to obtain a filtrate C; and adding a water-soluble carbonate or an aqueous solution of the carbonate to the filtrate C to make lithium ions in the filtrate C be converted into lithium carbonate precipitation, and then performing filtering to obtain lithium carbonate and a filtrate D. The technical problem perplexing aluminum electrolysis industry of rich and high content lithium in an excess aluminum electrolyte and inefficient utilization of valuable metals is solved, the economic benefit is improved, and stable production of an electrolytic aluminum enterprise is promoted.

Description

technical field [0001] The invention relates to a recycling treatment method of a lithium-rich aluminum electrolyte, in particular to a recycling treatment method of an acidic lithium-rich aluminum electrolyte, and belongs to the technical field of metallurgical waste treatment. Background technique [0002] In recent years, some electrolytic aluminum enterprises in my country have faced high lithium impurities contained in alumina raw materials, which have continuously accumulated in the aluminum electrolyte, resulting in a corresponding substantial increase in the lithium content in the aluminum electrolyte. It is generally believed that the enrichment amount of lithium salt at 1~3wt% is beneficial to reduce the primary crystal temperature of the aluminum electrolyte, and the enrichment amount above 5wt% will affect the condition of the aluminum electrolytic cell to a certain extent, and the enrichment amount of lithium salt in some electrolytic aluminum enterprises Even r...

AI Technical Summary

Problems solved by technology

In general, direct leaching with mineral acids is inefficient and usually requires pretreatment

In the leaching process, leaching at high temperature and inorganic acid will cause increased energy consumption, generate hydrogen fluoride gas to corrode equipment, and acid leaching at room temperature will produce hydrofluoric acid, which will also corrode equipment. The alkali neutralizes the inorganic acid, and the economic benefit is low

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