Preparation method of iron phosphate with controllable titanium content

The invention relates to a preparation method of iron phosphate with controllable titanium content, and the method comprises the following steps: dissolving a titanium dioxide by-product ferrous sulfate in water, then adding a phosphorus source, hydrogen peroxide and a saccharide flocculant, stirring, and carrying out filter pressing after stirring to obtain an iron salt solution; mixing the ferric salt solution and an oxidizing agent to perform oxidation reaction, then adding a phosphor salt to perform precipitation reaction, and then performing heat preservation reaction to obtain a precipitate; and carrying out primary washing and pulping on the precipitate, then adding phosphoric acid for aging, taking the precipitate after aging, and carrying out secondary washing, drying and calcining. According to the invention, the content of impurity Ti in the raw material titanium dioxide byproduct ferrous sulfate is purified and controlled, so that the content of titanium in the iron phosphate finished product is c