Method for producing high purity battery level ferric pyrophosphate from pickle liquor

Abstract

The invention provides a method for producing high-purity battery pole ferric phosphate by adopting pickle liquor, which comprises the following steps: adding iron sheet or scrap iron inside a reactive tank, pouring the pickle liquor; filtering the mixture to obtain purified ferrite solution; adding the purified ferrite solution inside a catalytic reaction kettle, and adding oxidant to perform exothermal reaction; dissolving and stirring phosphate to obtain primary ferric phosphate sizing agent; separating the primary ferric phosphate sizing agent to obtain primary ferric phosphate filter mass; dissolving and stirring the filter mass to obtain primary ferric phosphate mixed solution; heating, insulating and stirring the mixture inside an insulation reaction kettle until the mixture becomes pink; inputting all the mixed solution to the insulation reaction kettle, insulating and stirring the mixed solution for a certain period of time; and separating the ferric phosphate inside the ground paste to obtain the finished product of ferric phosphate. The invention utilizes the industrial pickle liquor as the raw material of the production method, realizes the further development of the recycling economy and the green economy due to the circulation use of the industrial waste, and greatly lowers the production cost.

Description

technical field [0001] The invention relates to a method for producing ferric orthophosphate, in particular to a method for producing high-purity battery-grade ferric orthophosphate by utilizing waste pickling liquid. Background technique [0002] Iron orthophosphate FePO 4 2H 2 O, the main component is FePO 4 , the existing ferric orthophosphate production process is generally to use phosphate to directly react with ferrous salt solution to generate ferric orthophosphate. The resulting product has a large particle size, and the particle size distribution is extremely uneven. 28%, generally only 22-26%. In addition, the existing industrial production will produce a large amount of pickling waste liquid during degreasing and rust removal, which has caused serious pollution to the environment on which human beings depend. [0003] Based on the above reasons, the inventor has developed a "method for producing high-purity battery-grade ferric orthophosphate by utilizing waste...

AI Technical Summary

Problems solved by technology

[0002] Iron orthophosphate FePO 4 2H 2 O, the main component is FePO 4 , the existing ferric orthophosphate production process is generally to use phosphate to directly react with ferrous salt solution to generate ferric orthophosphate. The resulting product has a large particle size, and the particle size distribution is extremely uneven. 28%, generally only 22-26%. In addition, the existing industrial production will produce a large amount of pickling waste liquid during degreasing and derusting, which has caused serious pollution to the environment on which human beings depend.