The invention discloses a stainless steel
oxide skin treatment method. A stainless steel
oxide skin is subjected to ball milling and screening; the undersize materials is added into a
sulfuric acid, the
sulfuric acid with the undersize materials is put into a high-pressure reaction kettle,
sulfur dioxide is introduced into the reaction kettle for leaching at a high temperature, and then the material is filtered;
ammonia water is added into an obtained filtrate to adjust the pH value of the solution, an
ammonium sulfide solution is added into the solution to precipitate
nickel,
ammonia water isadded into an obtained first filtrate to precipitate, the first filtrate is filtered to obtain second filter residues and a second filtrate; after being washed, the second filter residues are mixed with alkali, air is introduced to calcine, the mixture is subjected to fine
grinding, and then hot water is added for washing, the hot water with the mixture is filtered to obtain a third filtrate andthird filter residues, the third filtrate is subjected to concentrating and crystallizing to obtain
sodium chromate, and the third filter residues are subjected to
drying and crushing to obtain
iron oxide red;
nickel precipitates are added into a
sulfuric acid and
sodium chlorate to react so as to obtain a
nickel sulfate solution, and the nickel
sulfate solution is subjected to concentrating and crystallizing to obtain nickel
sulfate crystals; and the obtained second filtrate is subjected to concentrating and crystallizing to obtain
ammonium sulfate crystals. The method is simple to process, short in flow, high in
material recovery rate, low in cost and high in profit.