Battery-grade iron phosphate alkali-free production method

Abstract

The invention discloses a battery-grade iron phosphate alkali-free production method. The battery-grade iron phosphate alkali-free production method comprises the steps that a full-cycle process for producing mother liquor through iron phosphate is adopted, and a pure iron rod with the mass percentage being 99.95% and the mother liquor containing a reaction by-product, namely sulfuric acid, with the mass percentage being 12% to 16% continuously react for 8-12 h at 45 DEG C to produce a ferrous sulfate solution; and the ferrous sulfate solution is pumped into a reaction still by a pump, an excess dilute phosphoric acid aqueous solution is added in the normal temperature and normal pressure state, a precipitate, namely the iron phosphate, and dilute sulfuric acid are produced, after the steps of cooling and separation, a solid-phase substance, namely the iron phosphate, is washed and dried, both of liquid-phase substances, namely sulfuric acid and phosphoric acid, return to a ferrous sulfate preparation process, in this way, the steps are cycled in a reciprocating cycle mode, thus consumption of raw materials, namely the sulfuric acid and the phosphoric acid, is saved, and alkaline substances are not needed to neutralize the acid mother liquor. The battery-grade iron phosphate alkali-free production method has the advantages of lowering consumption of the raw materials and reducing the cost of wastewater treatment, the particle size of iron phosphate battery products is distributed evenly, the electrical performance index is better, and good economic and environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of manufacturing new energy vehicle power lithium battery materials, and in particular relates to an alkali-free production method of battery-grade iron phosphate. Background technique [0002] At present, in the new energy vehicle power lithium battery industry, the development of low-cost long-life batteries and batteries that can be safely and quickly charged are two key technologies. Lithium iron phosphate batteries have made significant breakthroughs in charge and discharge times and charging safety technology, but their main defect is that the cost of batteries remains high, and the main reason for the high cost of batteries is the high cost of positive electrode materials. Iron phosphate is the key upstream precursor material of lithium iron phosphate battery. Therefore, in order to reduce the cost of lithium battery, we must start from the source. In the existing technology, the battery industry is c...

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Problems solved by technology

However, the sulfuric acid aqueous solution produced in the reaction process still needs to be neutralized with alkali, and the cost of saline wastewater treatment is still high, so it is still impossible to fundamentally reduce the cost of the product

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