Modification method of iron-removed tailing slag

The invention provides a modification method of iron removal tailing slag, and belongs to the technical field of resource recycling and inorganic material preparation. The method comprises the following steps: by taking iron-removed tailing slag with high silicon dioxide content as a raw material, carrying out high-temperature alkali fusion reaction on the iron-removed tailing slag, sodium carbonate and sodium hydroxide, cooling, filtering, drying filter residues to obtain solid powder, and carrying out ball milling and organic modification to obtain a reinforcing filler of plastic and rubber; the filtrate is treated by a dispersing agent and a precipitating agent (CO2-containing industrial purge gas), nano silicon dioxide is prepared by a chemical precipitation method and is used as an industrial product, and waste liquid is used for recovering sodium bicarbonate. All the raw materials are converted and utilized in the process. Under proper reaction conditions, the tensile strengths of the modified iron-remo