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Improved leaching kinetics of chalcopyrite with simultaneous grinding and leaching.

Authors
Cobble JR
Source
1991 SME Annual Meeting, February 25-28, 1991, Denver, Colorado. Littleton, CO: Society for Mining, Metallurgy & Exploration, preprint 91-134 1991 :1-11
Link
NIOSHTIC No.
10009131
Abstract
The U.S. Bureau of Mines has developed a process to improve the leaching kinetics of diffusion-controlled systems. The system features the Bureau-developed turbomill, an attrition grinder that scrubs the reaction product coating away from the unreacted mineral grains during leaching. The system can be continuously operated at any temperature up to the boiling point of the leaching agent. This paper describes the research on the dissolution of chalcopyrite with acidified ferric sulfate which forms a sulfur product on the unreacted chalcopyrite surface. This method is a hydrometallurgical alternative to chalcopyrite smelter technology and eliminates SO2 emission problems and their associated costs. Batch testing at 90 deg C with the chalcopyrite-ferric sulfate system resulted in better than 99-pct extraction of copper. At an optimal energy consumption of 1,520 kw.H/st, 95 pct of the copper was extracted. Recent work has been directed to development of a continuous system and SX-EW treatment of the resulting pregnant liquor from the chalcopyrite-ferric sulfate leach.
Publication Date
19910101
Document Type
OP; Conference/Symposia Proceedings
Fiscal Year
1991
Identifying No.
OP 74-91
NIOSH Division
TURC
Source Name
1991 SME Annual Meeting, February 25-28, 1991, Denver, Colorado, preprint 91-134
State
AL; CO
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division