Battery-grade iron phosphate alkali-free production method
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A production method, iron phosphate technology, applied in the production of hydrogen, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of reducing product costs and high costs, and achieve the effects of reducing costs, avoiding neutralization treatment, and reducing material costs
Pending Publication Date: 2019-10-18
贵州磷化开瑞科技有限责任公司
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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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[0034] Example: The production method of the present invention is applied to a 2×5000t / a battery-grade iron phosphate project of a power lithium battery precursor material enterprise. A set of 5000t / a battery-grade ferric phosphate alkali-free production device was put into trial production in November. The approved production capacity of the device technology can reach 5000t / a, and the approved daily production capacity is 15.15t / d. From March 2018 to February 2019 The actual output is about 4868.2t, the average daily output is about 14.75t / d, and the capacity utilization rate of the device during the production period is 97.36%.
[0035] Calculate the comprehensive benefit that the present invention brings to the battery-grade iron phosphate enterprise from three aspects below:
[0036] 1. Calculate the theoretical value of sulfuric acid saving according to the reaction equation
[0037] 2 FeSo 4 + 2H 3 PO 4 + H 2 0 2 = 2 FeP0 4 ·H 2 O↓ + 2 H 2 SO 4
[0038] 304 ...
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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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