Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1991-09-06
1993-04-20
Lewis, Michael
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423165, 423166, 4236585, C01G 3714, C01F 500, C01F 540, C01F 1146
Patent
active
052040739
ABSTRACT:
This invention relates to a method for toxicity comprehensive elimination of chrome residues, comprising adding water to chrome residues, wet-grinding the same to a thick liquid, letting it react with dilute hydrochloric acid, and letting the filtrate obtained react with an additive containing barium, with sulfuric acid or magnesium sulfate, and with cream of lime or soda, so as to realize a comprehensive extraction and utilization of various elements. The hydrochloric acids can be circulated, and the filter residues can be used for iron-smelting and brick-making. By means of this method, it is possible not only to completely and permanently eliminate the toxicity of the residues, but also to realize a comprehehsive utilization of the residue resources. The method according to this invention requires only use of general technological equipment for chemical engineering production, and such equipment is easy to operate, requires little investment at a low cost, helps improving the environment and brings about beneficial economic results.
REFERENCES:
patent: 3371034 (1968-02-01), Richards
patent: 3552917 (1971-01-01), Weiss
patent: 4219416 (1980-08-01), Ramirez et al.
patent: 4338200 (1982-07-01), Zeijlstra
patent: 4954168 (1990-09-01), Crnojevich et al.
Hou Wei C.
Li Cheng Xiang
Lin Jin H.
Zeng Xian Ke
Zhong Gang Z.
Bloom Leonard
Guangzhou Zhufeng Institute
Kalinchak Stephen G.
Lewis Michael
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