Method for recovering iron sludge from stainless steel scraps recovered with chromium and nickel
A technology of stainless steel and iron recovery, applied in chemical instruments and methods, water/sludge/sewage treatment, metallurgical wastewater treatment, etc., can solve the problems of wasting iron material resources, increasing treatment costs, etc., and achieve the saving of harmless disposal costs , Conducive to environmental protection, the effect of reducing the burden
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Embodiment 1
[0020] In a stainless steel production enterprise in Songyang, Zhejiang Province, the waste sludge after reclaiming chromium and nickel from stainless steel sludge was used in the embodiment of the present invention for application. The pH of a certain waste sludge was measured to be 2.4, and the solid content was 10%. Iron is about 7% (dry basis, the same below), and it also contains 0.7% chromium and 0.4% nickel.
[0021] First, the waste sludge with a solid content of 10% is adjusted to pH 1.8 by adding hydrochloric acid, and extracted for 90 minutes; %; and add polyacrylamide, add polyacrylamide to 13ppm, filter after standing; carry out harmless treatment on the filtered filter cake, then add alkali to the filtrate, and adjust the pH to 2.8, then add polyacrylamide 2ppm; the alkali added is milk of lime; the above mixed solution is filtered, and the filter cake obtained by filtering is iron sludge, which is iron fine powder after medium temperature reduction, which can be...
Embodiment 2
[0023] Using the same raw materials as in Example 1, that is, the pH of the leftovers is 2.4, the solid content is 10%, and the iron content is about 7% (dry basis, the same below), and it also contains 0.7% chromium and 0.4% nickel.
[0024] Firstly, the waste sludge with a solid content of 10% is adjusted to pH 1.8 by adding hydrochloric acid, and extracted for 90 minutes; %; and add polyacrylamide, add polyacrylamide to 15ppm, filter after standing; carry out harmless treatment on the filtered filter cake, then add alkali to the filtrate, and adjust the pH to 2.8, then add polyacrylamide 3ppm; the alkali added is lime milk; the above mixed solution is filtered, and the filter cake obtained by filtering is iron sludge, which is iron fine powder after medium temperature reduction, which can be recycled; the filtrate is returned to the wastewater adjustment tank for reprocessing.
[0025] In the above embodiment, iron resources can be effectively recovered; and the subsequent ...
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