Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Hydrometallurgical production of copper from flotation concentrates.

Authors
Cobble-JR; Jordan-CE; Rice-DA
Source
Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 9472, 1993 Jan; :1-14
NIOSHTIC No.
10012172
Abstract
Dissolution of chalcopyrite with acidified ferric sulfate produces a sulfur layer on the unreacted chalcopyrite surface that interferes with further dissolution. The U.S. Bureau of Mines has developed a process to improve the leaching kinetics of these types 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 systems can be operated continuously at any temperature up to the boiling point of the leaching agent. This method is a hydrometallurgical alternative to chalcopyrite smelter technology and eliminates sulfur dioxide emission problems with its associated costs. Batch testing at 90 deg. C with the chalcopyrite-ferric sulfate system resulted in copper extraction exceeding 99 pct. At an optimal energy consumption of 1,520 kWh/st, 95 pct of the copper was extracted. The pregnant liquor was clarified and tested for typical solvent-extraction recovery of the copper. Two-stage extraction and two-stage stripping recovered 96 pct of the copper in an electrolyte suitable for copper electrowinning.
Keywords
Mining-industry; Metallurgy; Metallurgical-processes; Engineering-controls; Pollution; Sulfur-compounds
CAS No.
7440-50-8; 1308-56-1; 7446-09-5; 1344-28-1
Publication Date
19930101
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB94-103108
NTIS Price
A03
Identifying No.
RI-9472
NIOSH Division
TURC
Source Name
Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 9472
State
AL
TOP