The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 1990
Filed:
May. 13, 1988
Alkis S Rappas, Chagrin Falls, OH (US);
Brett T Waterman, Bedford, OH (US);
Kennecott Utah Copper Corporation, Wilmington, DE (US);
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.