Iron oxide red for lithium iron phosphate cathode material as well as preparation method and application thereof

The invention discloses iron oxide red for a lithium iron phosphate cathode material as well as a preparation method and application of the iron oxide red. The preparation method comprises the following steps: (1) dissolving waste solid ferrous sulfate of a titanium dioxide factory in water, adding an inorganic polymer flocculant, and standing to obtain a ferrous sulfate clarified solution; (2) adding the ferrous sulfate clarified solution into an oxidation barrel, adding a water-soluble acrylic polymer modifier and a dispersing agent, uniformly stirring, adding liquid caustic soda to quicklyadjust the pH value of the solution to 11.0-14.0, and continuing an oxidation reaction to prepare a brownish red seed crystal, and (3) carrying out an oxidation reaction on the obtained seed crystal to obtain the iron oxide red for the lithium iron phosphate positive electrode material. The iron oxide red is produced by adopting a pure liquid phase method, and the prepared iron oxide red is non-toxic, environment-friendly