Method for producing battery grade iron phosphate

Abstract

The invention discloses a method for producing battery grade iron phosphate. The method comprises the steps of adding a ferric trichloride solution into a reactor, adding a monosodium phosphate solution, then performing thermal reaction to obtain slurry, performing centrifugal separation on the slurry to obtain a solid and a mother solution, washing repeatedly, and drying and sieving the solid to obtain the battery grade iron phosphate. The method can well solve a phenomenon that precipitated iron phosphate is packaged by other matters; and ferric hydroxide precipitate is generated in the production process, so that the purity of the product can be effectively improved and the production difficulty is reduced.

Description

technical field [0001] The invention relates to a method for manufacturing electrode materials, and discloses a method for producing battery-grade iron phosphate. Background technique [0002] Battery-grade iron phosphate is a high-purity iron phosphate product. Due to its very high process standards, it is difficult to manufacture and the process is quite complicated. The iron phosphate produced by most domestic manufacturers can only be used as Ceramic grade iron phosphate is used. [0003] At present, the production of battery-grade iron phosphate in the industry mainly adopts the method of dropping trisodium phosphate solution in ferric chloride or ferric sulfate solution, generating ferric phosphate precipitation through displacement reaction, and then washing the precipitate with pure water to obtain the finished product of ferric phosphate , the main defect of this method is that trisodium phosphate is too alkaline and reacts rapidly with ferric chloride, and the pre...

AI Technical Summary

Problems solved by technology

[0002] Battery-grade iron phosphate is a high-purity iron phosphate product. Due to its very high process standards, it is difficult to manufacture and the process is quite complicated. The iron phosphate produced by most domestic manufacturers can only be used as ceramic grade ferric phosphate

[0003] At present, the production of battery-grade iron phosphate in the industry mainly adopts the method of dropping trisodium phosphate solution in ferric chloride or ferric sulfate solution, generating ferric phosphate precipitation through displacement reaction, and then washing the precipitate with pure water to obtain the finished product of ferric phosphate , the main defect of this method is that trisodium phosphate is too alkaline and reacts rapidly with ferric chloride, and the precipitated ferric phosphate and other substances are easy to form packages, and because some hydroxides in trisodium phosphate are ionized, It is easy to react with ferric chloride to form ferric hydroxide precipitation, so the purity of the product is not easy to improve. Strict process conditions and complex process requirements must be adopted during production, which makes production difficult and costly

Images