发明名称 |
Method for recovering chromium from chromium-bearing material |
摘要 |
A method for recovering chromium from chromium-bearing material which comprises heating the material which can contain any one or combination of Co, Ni, Fe, Mo, and W with solid alkali metal hydroxide in an oxidizing atmosphere at 600 DEG C.-1000 DEG C. to form a fused material containing water soluble compounds of Cr, Mo, and W contained therein. The fused material is cooled and contacted with water to form a leach solution and a residue. The leach solution is adjusted to a pH of from about 5-8 with sulfuric acid, and a water soluble calcium salt is added. The chromium-rich liquor is then adjusted to a pH of 1-3 with sulfuric acid. Sodium metabisulfite is added to the chromium-rich liquor to reduce the chromium to the trivalent state after which the pH is adjusted to 5-8 with a base to form a precipitate of essentially all of the chromium.
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申请公布号 |
US4966760(A) |
申请公布日期 |
1990.10.30 |
申请号 |
US19890403078 |
申请日期 |
1989.09.05 |
申请人 |
LADD, JUDITH A.;RITSKO, JOSEPH E. |
发明人 |
LADD, JUDITH A.;RITSKO, JOSEPH E. |
分类号 |
C01G37/00;C01G37/02;C22B3/14;C22B3/44;C22B34/32 |
主分类号 |
C01G37/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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