Preparation method and application of iso-phosphorus-manganese-iron-ore type iron phosphate

Abstract

The invention belongs to the field of battery material recovery, and discloses a preparation method and application of iso-phosphorus-manganese-iron-ore type iron phosphate, and the method comprises the following steps: mixing lithium iron phosphate with a solvent, adding an acid solution, and adjusting the pH value to be acidic to obtain an acidic lithium iron phosphate solution; and adding a transition metal additive into the acidic lithium iron phosphate solution, strengthening the microenvironment, carrying out leaching reaction, and conducting filtering to obtain iso-phosphorus-manganese-iron-ore type iron phosphate and a lithium-rich solution. According to the method, lithium iron phosphate and water are mixed, acid is added to maintain the pH to be 2-6, then a nickel-cobalt-manganese transition metal additive is added through a microenvironment strengthening method to achieve a surface catalytic enhancement reaction, generation of hydroxyl radicals is promoted, the oxidation reaction rate of ferrous iron is greatly increased, and therefore selective leaching of lithium under the oxygen / air condition is achieved; and the leaching rate of lithium in the leachate reaches 90.5-99.9%, and the content of iron and the content of phosphorus in the leachate are both lower than 0.1 ppm.

Description

technical field [0001] The invention belongs to the field of battery material recycling, and in particular relates to a preparation method and application of isophosphorus manganite-type iron phosphate. Background technique [0002] In recent years, with the sharp increase in the output of electronic and electrical equipment, the demand for lithium-ion batteries is also increasing. However, lithium-ion batteries have a limited service life, and a large amount of spent lithium-ion batteries are generated every year. If these lithium-ion batteries cannot be properly recycled, serious resource and environmental problems will arise: on the one hand, lithium-ion batteries contain high content of valuable metals, such as lithium, nickel, cobalt, manganese, etc. The content in it is much higher than the average content in the ore. If it cannot be properly recycled, it will cause a huge waste of resources; cause potential harm. If these lithium-ion batteries can be effectively re...

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method and application thereof of isophosphatite type iron phosphate, this method solves the problem of extracting lithium existing in the prior art Poor selectivity, high reagent consumption, long recycling process, low product value, etc., by means of process intensification to achieve low impurity content in leachate, high lithium concentration, low reagent consumption, and high lithium recovery rate while directly preparing isophosphorus manganese Iron ore lithium phosphate

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