Method for extracting lithium from electrolytic aluminum waste residues

Abstract

The invention discloses a method for extracting lithium from electrolytic aluminum waste residues. The method comprises the following steps: (1) reacting the electrolytic aluminum waste residues withconcentrated sulfuric acid to obtain a mixture A; (2) adding water to dissolve the mixture A, filtering the obtained solution to obtain a filtrate B, slowly adding calcium oxide to the filtrate B, andfiltering the obtained solution to obtain a filter residue C and a filtrate D; (3) heating the filtrate D, carrying out evaporative concentrating, filtering the obtained concentrate, further carryingout evaporative concentrating on the obtained filtrate to obtain a filtrate E, and maintaining the filtrate E in a heated state; and 4) adding a saturated sodium carbonate solution to the filtrate Ein order to obtain a suspension F, filtering the suspension F to obtain a filter cake, and washing and drying the filter cake to obtain a lithium carbonate product. The method adopts the waste residueof the electrolytic aluminum industry as raw material, the raw material has a wide source, and has a lower cost than a lithium ore raw material, the method has the characteristics of easiness in extraction and high yield, other raw materials used in the extraction method have a low price and low cost, and obtained byproducts can be recycled.

Description

technical field [0001] The invention relates to the technical field of lithium extraction, in particular to a method for extracting lithium from electrolytic aluminum waste residue. Background technique [0002] my country is a country rich in lithium resources, but there have always been certain difficulties in the development and utilization of lithium resources, including difficulties in extracting lithium resources, low extraction ratios, and problems that some lithium resources have not been utilized. With the development of the new energy field, the demand for lithium-ion batteries has increased rapidly, which has led to a rapid rise in the price of lithium raw materials. [0003] At present, my country's lithium raw materials are mainly extracted through lithium ore extraction and brine extraction. In northern China, a certain amount of lithium is associated with aluminum ore resources. In the electrolytic aluminum industry, lithium fluoride is also added as an auxi...

AI Technical Summary

Problems solved by technology

But this method has too many extraction steps, and uses sodium carbonate first, then uses lime, causes in feed liquid needs to add a large amount of sodium carbonate, and sodium ion concentration is too high, and solution can't be effectively concentrated, has reduced the extraction rate of lithium carbonate

At the same time, the use of carbon dioxide is increased, and high-pressure reaction equipment is required, which increases equipment input costs and raw material costs

The causticization reaction produces a large amount of lye, which brings trouble to the subsequent waste liquid treatment

And do not see at present, adopt fewer extraction steps, milder reaction conditions, and the report of the lithium extraction method of cheaper raw material

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