Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1988-05-13
1990-01-02
Stoll, Robert L.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75 25, 75108, 75120, 75121, 75117, 423 87, 423 92, 423 98, 423 35, 423 55, 423551, 423602, 204 96, 204116, C01G 2102
Patent
active
048910678
ABSTRACT:
A process for the treatment of flue dust from copper and lead smelters includes the steps of subjecting a slurry (10) of water and flue dust to a first caustic leach (12) to form a first liquids soluble sulfate solution (14) and a first solids portion (15), subjecting the solids portion to a second caustic leach (16) to solubilize lead and arsenic in a second liquid portion (22) and, selectively extracting the arsenic from the second liquid portion by precipitation (23). A related process for the treatment of flue dust allows for the recovery of bismuth and includes the steps of separating (53) a slurry of water and flue dust into a first liquids (54) and first solids (63) portion, neutralizing (55) the first liquids portion to form a second liquids soluble sulfate solution (58) and a second solids portion (59), subjecting the first solids (63) portion to a first caustic leach (61) to produce a third liquids (66) and third solids portion (82), subjecting the third liquids portion (66) and the second solids portion (59) to a second caustic leach (60) to produce a fourth liquids (68) and fourth solids portion (91) and, selectively extracting arsenic from the fourth liquids portion (68) and bismuth from the third solids portion (82). A process for the recovery of soluble lead values from lead compounds includes the steps of subjecting a slurry (100) of the lead compound to a caustic leach (101) to solubilize the lead and oxidizing the lead in an electrolytic cell (38) to form lead oxide.
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Rappas Alkis S.
Waterman Brett T.
Kennecott Utah Copper Corporation
Stoll Robert L.
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