Oxidative pressure leaching of zinc concentrates

Abstract Sherritt's zinc pressure leaching process converts zinc sulphide concentrates directly to zinc sulphate solutions and elemental sulphur. Thus, one pressure process step replaces both the roasting and leaching operations of the conventional roast-leach route. In addition, high single-pass extractions eliminate the need for residue treatments to recover unleached zinc. Because pressure leaching produces elemental sulphur, rather than sulphur dioxide, acid plants and smoke stacks are not required, and air pollution control and work-place hygiene are greatly improved.In 1977, Cominco Ltd. and Sherritt Gordon Mines Limited jointly operated a three-tonne-per-day pilot plant to demonstrate pressure oxidative leaching of Sullivan zinc concentrate and the subsequent separation of elemental sulphur. The process consisted of regrinding the concentrate, continuous leaching at 150°C at elevated oxygen pressures in a four-compartment autoclave and the subsequent recovery of elemental sulphur, either in the molten liquid form from a decantation autoclave or as a flotation concentrate. Of the zinc contained in the concentrate, 97% was extracted in 90 minutes, and 96% of the sulphur was converted to the elemental form.Following the successful pilot campaign, Cominco began building the world's first commercial zinc pressure leaching plant. This plant, which was in operation by late 1980, will eventually treat about 25% of Cominco's planned zinc capacity of 270,000 tonnes per year.This paper describes the general process principles, the results obtained from the pilot plant and the integration of the process into Cominco's operations at Trail. The application of pressure leaching to a "grass-roots" plant is also discussed, and compared with conventional roast-leaching.
Keywords: Leaching, Pressure leaching, Oxidative pressure leaching, Zinc pressure leaching, Extractive metallurgy, Sulphur separation, Flotation, Trail Operations, Cominco Ltd., Sherritt Gordon Mines Ltd.
Full Access to Technical Paper
PDF version for $20.00
Search
Sort By:  Relevance
Showing results 1 - 10
Text
Publication: CIM Bulletin
Author(s): P. S. DALY
Issue: 829
Volume: 74
Year: 1981
Text
Publication: CIM Bulletin
Author(s): M.W. MIKHAIL, LC. BIRD, N.T.L LANDGREN
Issue: 829
Volume: 74
Year: 1981
Text
Summary: Description des études qui ont conduit à la conception specifique du système de drainage de la mine à ciel ouvert. Les approches différentes sont examinées ainsi que la valeur du systeme recommandé.
Publication: CIM Bulletin
Author(s): A. LIARD, G. SAURIOL, H. SOMMELET
Issue: 829
Volume: 74
Year: 1981
Text
Summary: This paper details the highlights of the open-pit and underground operations of Mclntyre Mines Limited in the Smoky River area of Alberta. Mining methods, operating equipment and manpower are outlined, followed by a discussion of reclamation and environmental control.
Publication: CIM Bulletin
Author(s): J.E. CARTER, D.P. WALLI
Keywords: Coal mining, Open-pit mining, Underground mining, Smoky River Mine, Ventilation, Productivity, Reclamation, Safety.
Issue: 829
Volume: 74
Year: 1981
Text
Summary: This paper is based on work done by the authors in a study of the structural features at a quarry excavated in Chazy limestone on the Island of Montreal. Observations on failures on the quarry walls and benches were recorded, and back-analyses of small-scale failures were carried out, thus enabling an assessment to be made of the in-situ strength properties of the rock. Using this information, and data from shear tests in the laboratory, the authors made an analysis of the stability of the...
Publication: CIM Bulletin
Author(s): JOHN E. UDD, PETER LEINBERGER, ROMAN KOZARYCZ
Keywords: Open-pit mining, Quarrying, Slope stability, Chazy limestone, Montreal, Rock mechanics, Structural geology, Shear testing.
Issue: 829
Volume: 74
Year: 1981
Text
Summary: There is a considerable resource of data for spherical charge cratering, both as single  charges  and  in   row-of-charge geometry. The data are, however, based on cratering performance to a single free planar surface.In practice, the more common circumstance involves an angular surface geometry, such as occurs at the toe of a bench or the wall of aslope. It is for the purpose of investigating this circumstance that the described test work was conducted.The test...
Publication: CIM Bulletin
Author(s): R.R. MacLACHLAN, D.E. SALMAN, R.J. BARCLAY
Keywords: Open-pit mining, Cratering, Spherical charge cratering, Blasting, Benching, Rock mechanics, underground mining.
Issue: 829
Volume: 74
Year: 1981
Text
Summary: The objectives of the Wabush Mines tailings stabilization program are to control dust lift-off and to rehabilitate the disposal area. The evolution of the program started with test plots in 1970, these being continued and expanded upon through 1974. In 1976, a 35-acre vegetation field trial was attempted and failed, part of the failure being attributed to lack of adequate equipment. Subsequently, equipment was purchased and during the summer of 1979-80 extensive areas were treated. The...
Publication: CIM Bulletin
Author(s): EDGAR L HORNER
Keywords: Open-pit mining, Tailings disposal, Reclamation, Vegetation, Wabush Mines, Soils, Dust control.
Issue: 829
Volume: 74
Year: 1981
Text
Summary: This paper briefly outlines the characteristics which should be considered in assessing the economics of mineral exploration, and illustrates such an assessment by using data from the Canadian base metal sector. Implications for the sector are found to include the following:

base metal exploration has the potential to create a substantial amount of new wealth;
 investment incentive for exploration under current conditions is not unattractive over-all;
because of existing...
Publication: CIM Bulletin
Author(s): BRIAN W. MACKENZIE
Keywords: Mineral economics, Exploration, Base metal exploration, Investment, Taxation, Value, Budgets, Government policy, Information exchange.
Issue: 829
Volume: 74
Year: 1981
Text
Summary: Originally intended to be implemented in 1977, but actually introduced effective May 6, 1974, the earned depletion regulations have been substantially refined and modified since their appearance on the Canadian tax scene, so that this important legislation now consists of a highly complicated set of rules which even the most astute follower of tax law has considerable difficulty sorting out!This month, Tax Notes attempts to cut through this bewildering array of regulations, in reviewing the...
Publication: CIM Bulletin
Author(s): ROBERT B. PARSONS
Issue: 829
Volume: 74
Year: 1981
Text
Summary: A stream sediment geochemical survey covering an area of 13,000 sq. km near Churchill Falls, Labrador, was conducted for Brinex (British Newfoundland Explorations Ltd.) prior to partial flooding by the Churchill Falls power project. Stream sediments (minus 80-mesh) were analyzed for Cu, Pb, Zn, Ni, Ag, Mo, UandMn, and the heavy mineral, nonmagnetic fraction (minus 60-mesh)for Cu, Pb, Zn, Ni, Ag, Mo, Ba andMn. A binocular examination of the concentrates for sulphides and pyrope garnet was done...
Publication: CIM Bulletin
Author(s): JOHN E. CALLAHAN
Keywords: Exploration, Geochemical exploration, Stream-sediment surveys, Heavy-mineral concentrates, Churchill Falls area, Labrador, Copper, Lead, Zinc, Silver, Nickel, Manganese, Molybdenum, Uranium, Barium.
Issue: 829
Volume: 74
Year: 1981
Powered by Coveo Enterprise Search