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:
Nov. 19, 2002
Filed:
Jun. 05, 1995
Anthony L. Hannaford, Littleton, CO (US);
K. Marc Le Vier, Salt Lake City, UT (US);
Rene R. Fernandez, Salt Lake City, UT (US);
Gopalan Ramadorai, Tuscon, AZ (US);
Arno Fitting, Neu-Anspach, DE;
Gurudas Samant, Fronhausen, DE;
Bodo Peinemann, Frankfurt am Main, DE;
Gebhard Bandel, Frankfurt am Main, DE;
Hans Kofalck, Hattersheim, DE;
Newmont USA Limited, Denver, CO (US);
Abstract
Roasting of ores with metal values such as precious metal ores for recovery of metal values with conversion of arsenic to an insoluble form in-situ in presence of an additive such as iron and in presence of oxygen injected initially or supplementally in a roaster such as in a circulating fluid bed roaster; volatilized arsenic in roasting of ores may also be converted to an insoluble form in gas phase in a two stage roaster process after removal of solids from a gas phase and contact with an additive at high oxygen concentration in a second stage roaster.