Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Patent
1991-08-08
1993-08-10
Morris, Theodore
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
4231501, 423153, 423101, 423109, 423110, 423 27, 423 34, 423 47, 423 42, C01G 900, C01G 5300, C01G 5100, C01G 300
Patent
active
052346692
ABSTRACT:
Methods are disclosed for treating smelter flue dust and other smelter by-products so as to recover non-ferrous metals therefrom and convert arsenic and sulfur in the flue dust into non-leachable compounds. The methods allow the flue dust and other smelter by-products such as smelter sludges to be disposed of in a natural environment without subsequent leaching of heavy metals, sulfur, and arsenic. The smelter by-products are mixed with hydrated lie, formed into agglomerates, and roasted at an optimal temperature of about 650.degree. C. to form oxidized arsenic and sulfur which react with the lime in the agglomerates to form non-leachable compounds. The roasted agglomerates are contacted with a basic lixiviant comprising dissolved ammonia and an ammonium salt to dissolve non-ferrous metals such as copper from the roasted agglomerates. Used lixiviant can be boiled to precipitate the non-ferrous metals dissolved therein and vaporize the ammonia, thereby regenerating the lixiviant. Leaching is preferably performed in a leaching cell used as the final repository of the leached agglomerates.
REFERENCES:
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Idaho Research Foundation Inc.
Morris Theodore
Squillante Edward
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