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From copper and nickel processing:
Cobalt contained in and smelted with copper concentrate is oxidized along with iron during the final conversion to blister copper. It then enters the slag layer, which can be treated separately, usually in an electric furnace, and the cobalt recovered by reduction with carbon to a copper-iron-cobalt alloy. In nickel smelting, most of the cobalt is recovered during electrolytic refining of the nickel by precipitation from solution, usually as a cobaltic hydroxide. But even in nickel smelting, cobalt starts to oxidize before the nickel and can be recovered from the final converter slag. In the ammonia pressure leaching of nickel, cobalt is recovered from solution by reduction with hydrogen under pressure. In refineries using a chloride leach for nickel matte, solvent extraction is used to remove cobalt directly from the pregnant solution. The resulting concentrated solution, after some purification, is suitable for the recovery of cobalt by electrowinning.
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ELEMENT: NICKEL |
Periodic Table of the Elements... the online resource for information on the subject, inculdes free downloads section and more
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| 3.
Nickel |
Nickel is obtained commercially from pentlandite and pyrrhotite of the Sudbury
... Exposure to nickel metal and soluble compounds (as Ni) should not exceed ...
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06-Jan-2006 Hits: 202 Rating: 0.00 Votes: 0
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