Method for recycling lithium carbonate from lithium iron phosphate battery

Abstract

The invention discloses a method for recycling lithium carbonate from a lithium iron phosphate battery. The method comprises the following steps: (S0) discharging, decomposing and sorting the lithium iron phosphate battery and taking lithium iron phosphate powder; (S1) calcining under high temperature; (S2) performing oxidizing acid-pickling reaction, wherein the pH value is 0-1.5; (S3) filtering, thereby taking a filtrate I; (S4) adding alkali, regulating the pH value to be 2-4, filtering and taking the filtrate; (S5) adding alkali, regulating the pH value to be 8-11, filtering and taking the filtrate; (S6) performing evaporative crystallizing, sintering at 250-550 DEG C and taking the residual block powder; (S7) adding water for dissolving, filtering and taking the filtrate; (S8) dropwise adding a sodium carbonate solution, thereby acquiring lithium carbonate. According to the method, the technological process is simple, the cost is low, lithium iron phosphate batteries can be recycled in batches and the yield and the purity of lithium carbonate are high.

Description

technical field [0001] The invention belongs to the field of resource recovery of waste lithium batteries, in particular to a method for recovering lithium carbonate from lithium iron phosphate batteries. Background technique [0002] In recent years, under the vigorous promotion of national policies and local enterprises, new energy vehicles have developed rapidly. The rapid development of new energy vehicles has also brought about a surge in lithium batteries. According to the forecast, the demand for power lithium batteries will reach 125gwh in 2020, and the amount of scrapping will be about 500,000 tons; by 2023, the amount of scrapping will be about 1.16 million tons. On this basis, the market scale created by recycling nickel, cobalt, manganese, lithium, aluminum, copper and other metals from waste power lithium batteries will begin to explode in 2018, reaching 5.2 billion yuan, of which nickel is 1.4 billion yuan and cobalt is 870 million yuan. , lithium 2.6 billion...

AI Technical Summary

Problems solved by technology

This method is only for lithium iron phosphate waste, not the entire lithium iron phosphate battery. Concentrated sulfuric acid is used in the leaching process. In industrial production, not only the cost is high, but also high-risk chemicals are used, which has potential safety hazards. Calcium chloride and Alkali and other substances are not well recovered

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