Method for extracting ultra-fine ferric oxide by using waste slag
A technology of iron oxide and waste residue, applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of difficulty in detoxification, pollution, high cost, etc., and achieve the effect of high economic value, strong operability and small particle size
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[0013] The following examples further illustrate the present invention.
[0014] In the embodiment, it is divided into three process stages, one is the detoxification process, the second is the extraction and production of iron oxide, and the third is the production of nanometer ultrafine iron oxide.
[0015] Detoxification process: As the chromium residue contains both water-soluble hexavalent chromium and water-insoluble hexavalent chromium, it is not easy to complete detoxification. This method uses rotary kiln incineration and detoxification; firstly, chromium slag is crushed into 80 mesh powder, then coal and coal gangue powder are used as reducing agent, chromium slag powder is 100%, and 4% coal is added to chromium slag powder. Coal gangue powder 8%; conveyed by belt to rotary kiln for incineration, 40 minutes (regulate the time and furnace temperature according to the degree of burning through the material in the furnace); during incineration, the fuel can be made from hig...
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