Recovery of nickel and cobalt from reduced nickeliferous ores |
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| 申请号 | US3714326D | 申请日 | 1971-05-17 | 公开(公告)号 | US3714326A | 公开(公告)日 | 1973-01-30 |
| 申请人 | FREEPORT MINERALS CO; | 发明人 | MATSON R; | ||||
| 摘要 | In an ammoniacal leaching process for the recovery of nickel and cobalt from reduced nickeliferous ores, copper contamination of the product liquor may be minimized or substantially avoided by controlling oxidation of ore constituents during aeration of a slurry of reduced ore and leach liquor. | ||||||
| 权利要求 | 1. In a process of recovering non-ferrous metal values from nickeliferous ores containing copper as a contaminant in which the ore in a reduced condition is subjected to leaching with an ammoniacal liquor and the slurry formed is aerated in order to recover non-ferrous metal values in a solubilized form in the leach liquor, the improvement for selectively minimizing solubilization of copper values in the leach liquor which comprises carrying out the aeration of the slurry only to the point where the redox potential in said aerated leach liquor is between about -200 and -400 millivolts, as measured by a calomel-platinum electrode pair and corrected to 25*C. 2. The process as defined in claim 1 wherein aeration is continued until the redox potential in said aerated leach liquor reaches a value between about -250 and about -200 millivolts, as measured by a calomel-platinum electrode pair and corrected to 25*C., aeration is then dis-continued, and the leach liquor is separated from the slurry. 3. The process as defined in claim 1 in which nickel and cobalt are the non-ferrous metals in the ore that are recovered in the leach liquor free from substantial contamination by copper. |
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