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AssigneeGuangzhou Zhufeng Institute
InventorsGang Z. Zhong, Cheng Xiang Li, Xian Ke Zeng, Jin H. Lin, Wei C. Hou
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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.
A method for toxicity elimination of chrome residues including calcium and magnesium comprising adding water to said chrome residues and wet-grinding the same, reacting the ground residues with hydrochloric acid having a concentration of 15.1-18% HCl, and said reaction being controlled, such that a reaction temperature of between 30.degree.-49.5.degree. C. and a pH of between 6.6 and 7.5 is maintained for between 5-9.5 minutes, whereby a solution is obtained having dissolved therein ions of chrome, including Cr.sup.+ and ions of magnesium and calcium, and further whereby a residue is obtained and separating the solution from the residue, whereby a filter liquor including the chrome ions in the solution and a residue is provided;
Dependencies are inferred from the claim text.