A kind of method that titanium dioxide by-product ferrous sulfate prepares ferric phosphate

Abstract

The invention discloses a method for preparing iron phosphate from a titanium white byproduct ferrous sulfate. The method is characterized by comprising the following steps: preparing a saturated solution from the titanium white byproduct ferrous sulfate, filtering to remove the undissolved solid, heating to 80-95 DEG C, introducing air for stirring, adding dilute sulfuric acid to regulate the pH value to 3-4, stirring to generate turbidity, adding a flocculant, filtering to remove the solid, adding a small amount of sodium dihydrogen phosphate, stirring to generate abundant turbidity, adding a flocculant, filtering to remove the solid, adding sodium phosphate into the liquid, controlling the pH value at 1-3 or so by using dilute phosphoric acid, filtering to obtain the solid, and washing with deionized water to obtain the iron phosphate. The low-cost titanium white byproduct is utilized to prepare the iron phosphate, thereby saving the resources and lowering the pollution. The purification of ferrous sulfate and synthesis of iron phosphate are completed in one step, thereby enhancing the efficiency, and reducing the pollutant discharge. The discharged substances are basically phosphates, and can be used as a fertilizer.

Description

technical field [0001] The invention discloses a method for preparing ferric phosphate from a by-product of titanium dioxide, ferrous sulfate, and belongs to the technical field of chemical industry. Background technique [0002] Lithium-ion batteries for power are booming, and the production of lithium iron phosphate cathode materials is increasing rapidly. The iron source of lithium iron phosphate is mostly iron phosphate, and iron phosphate is often prepared by using ferrous sulfate or ferric sulfate, and iron sulfate is often derived from ferrous sulfate. Ordinary ferrous sulfate cannot meet the requirements for preparing ferric phosphate due to its low purity. High-purity ferrous sulfate is obtained by reacting pure iron powder with sulfuric acid, which causes lithium iron phosphate materials to compete with steel for resources, which is unfavorable in the long run. of. [0003] At the same time, my country is a big country in the production of titanium dioxide. When...

AI Technical Summary

Problems solved by technology

This not only wastes sulfur and iron resources, but also causes environmental pollution