A kind of processing method of waste lithium iron phosphate

Abstract

The invention discloses a treatment method for waste lithium iron phosphate. The waste lithium iron phosphate material is pretreated, and the pretreated material is added to a phosphoric acid solution to react and then filtered to obtain a first filtrate and a first filter residue; the first filtrate is added to a sulfide reaction, and then filtered to obtain a second filtrate and a second filter residue; Add iron powder to the second filtrate, remove iron after stirring and reacting, add battery-grade lithium carbonate to the obtained iron-removing material, stir and react until no bubbles are generated, and obtain the reaction material; add the reaction material to a water-soluble organic carbon source, stir to disperse and dissolve , the obtained material is spray-dried in a spray dryer to obtain a dry material; the dried material is put into a roller furnace for calcination, and after crushing, mixing, screening and iron removal, vacuum packaging is obtained. The invention can realize the resource utilization of waste lithium iron phosphate, realize high-end circulation, and at the same time, have a high recovery rate of each element, produce less waste water, and obtain excellent performance of the obtained lithium iron phosphate.

Description

technical field [0001] The invention relates to a treatment method for waste lithium iron phosphate, belonging to the technical field of waste treatment. Background technique [0002] With the adjustment of new energy policies, the subsidy has gradually declined. At the same time, the price of lithium iron phosphate has also dropped from the previous 100,000 / ton to the current 45,000 / ton, and its application field has gradually expanded. From the previous bus Vehicles are extended to special purpose vehicles, low-speed electric vehicles and electric vehicles below A0 level. [0003] Recently, the Ministry of Industry and Information Technology released the fourth batch of "Catalogue of Recommended Models for the Promotion and Application of New Energy Vehicles" in 2019. A total of 238 models were on the list, among which the models supporting lithium iron phosphate came from JAC , BAIC New Energy, Zotye Automobile , Chery Commercial Vehicles, Chufeng Automobile, FAW Jiefa...

AI Technical Summary

Problems solved by technology

[0013] The total amount of waste lithium iron phosphate obtained can reach more than 5,000 tons per year. How to deal with these waste lithium iron phosphate materials has become an important issue, such as using newly produced lithium iron phosphate materials in proportion to these waste materials. Although the way of use is simple to handle, there are very big hidden dangers, such as the magnetic material in it, how to handle it improperly may cause the safety performance of lithium iron phosphate battery to decrease, and at the same time have a great impact on the service life of lithium iron phosphate

[0014] Other treatment methods also have disadvantages such as long process, low added value of the obtained product, and large amount of sewage treatment.

Images