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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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First Claim