The invention relates to a method for producing ultrafine battery-level positive
ferric phosphate. The method comprises the following steps that: a ferrite solution is added into a catalytic reaction kettle, added with sulphuric acid to adjust the pH value and slowly added with
hydrogen peroxide while stirring to perform oxidation reaction; the dissolved
phosphate solution is added to the catalytic reaction kettle, added with soda ash or
ammonia to control the pH value and strongly stirred to obtain
slurry of the positive
ferric phosphate; the
slurry is water-washed, press-filtered and separated to obtain a positive
ferric phosphate
filter cake; a
conversion reaction kettle is added with an
aqueous solution of
phosphoric acid and added with the
filter cake, the pH value and the temperature of the obtained mixing solution are adjusted, and the mixing solution is stirred; the mixing solution is placed in a
thermal insulation reaction kettle, heated and stirred for a few hours until the mixing solution becomes pink, and the
slurry of the positive ferric phosphate is obtained; and the slurry is water-washed, press-filtered, dried and crushed to obtain a finished product of the positive ferric phosphate. The method has the advantages of complete reaction and high reaction ratio, 28 to 29 percent of the total
iron content Fe<3+> of the obtained products and even and thin grain
diameter, and the D50 is less than or equal to 2um, the P is more than or equal to 16 percent, the grain is ultrafine and high in purity, and has even grain
diameter; and because waste
slag discharged in the production of a
titanium pigment or industrial acid
pickling waste liquid is used as a
raw material, the environment is protected, and the product cost is lowered.