Method for regenerating iron phosphate waste

Abstract

The invention discloses a method for regenerating an iron phosphate waste. The method comprises the following steps: S1, performing acid dissolution on the iron phosphate waste, and performing filtering so as to obtain a solution with iron and phosphorus; S2, detecting the ratio of iron to phosphorus in the solution A, controlling the ratio of iron to phosphorus in the solution A to 1:(0.9-1.02),so as to obtain a solution B; S3, adding an alkaline solution to the solution B under stirring, adjusting the pH value to 2.0-2.5, performing a reaction at (85-100) DEG C for (0.2-2) hours, performingsolid-liquid separation, and washing filter cakes so as to obtain amorphous iron phosphate intermediate filter cakes; and S4, pulping the amorphous iron phosphate intermediate filter cakes, adding phosphoric acid, performing a reaction under a stirring and heating condition, performing solid-liquid separation, washing the filter cakes so as to obtain crystalline iron phosphate filter cakes, and performing calcining, so as to obtain battery grade anhydrous iron phosphate. By adopting the scheme of the invention, not only are resource recycling and reuse achieved, but also economic benefits ofenterprises are increased, and the method has great significances for producers of iron phosphate.

Description

technical field

[0001] The invention relates to the technical field of resource recycling and the technical field of lithium-ion battery materials, in particular to a method for regenerating ferric phosphate waste. Background technique

[0002] With the country's strong support for new energy technologies, lithium-ion batteries have become a research hotspot in recent years. At present, there are two mainstream battery technology routes for new energy vehicles, lithium iron phosphate and ternary lithium batteries. Although these two batteries compete in many fields, the competition in the field of new energy vehicles is the main line. Lithium iron phosphate battery refers to a lithium ion battery that uses lithium iron phosphate as the positive electrode material. This type of battery does not contain precious metal elements (such as cobalt, etc.). Since it does not contain precious metal materials, the cost of raw materials for lithium iron phosphate batteries is relativel...

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