Process for treating ore having recoverable metal values including arsenic containing components

US6482373B1 · kind B1 · utility

Assignee

• NEWMONT USA LIMITED · US

Inventors

• Anthony L. Hannaford · Springbok, ZA
• K. Marc Le Vier · Salt Lake City, US
• Rene R. Fernandez · Elko, US
• Gopalan Ramadorai · Golden, 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

Key dates

• Filing date: Jun 5, 1995
• Grant date: Nov 19, 2002
• Expiry date: Jun 5, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22B1/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

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.