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:
May. 30, 1978
Filed:
Aug. 03, 1977
Gyula John Borbely, Copper Cliff, CA;
The International Nickel Company, Inc., New York, NY (US);
Abstract
A process for substantially reducing the presence of impurities from a sulfur-containing feed material such as dust and hydrometallurgical wastes that result from smelting and refining operations. Pelletized feed materials are heated to 800.degree. to 1150.degree. C and reacted with a gas stream containing chlorine and oxygen. In the presence of sulfur dioxide formed in situ and due to the presence of residual sulfur, the order of volatilization of the elements contained in the feed material is changed from that known for conventional chloridization processes to a more advantageous order. The elements Cd, Bi, Re, Pb, Mo, Sn, Sb, Zn, and As are volatilized and thereby separated from the solid feed material which is consequently enriched in Cu, Ag, Co, Fe, Ni, Au, and precious metals. The feed material is subsequently refined conventionally.