Development of a copper arsenate process for Inco's Manitoba Division

Abstract
As part of an over-all arsenic management strategy, Inco has developed a novel process that converts a by-product high moisture copper/arsenic sulphide precipitate into a crystalline copper arsenate suitable for the manufacture of wood preservation chemicals.
The copper/arsenic sulphide precipitate is atmospherically leached with oxygen and sulphuric acid, producing a crude (blue) copper arsenate precipitate, elemental sulphur, and a copper and nickel containing solution. The blue copper arsenate is dissolved with sulphuric acid, the molar Cu/As ratio is raised to 2, and a crystalline copper arsenate (olivenite) is precipitated by the addition of sodium carbonate. Dissolved copper is recovered using metallic nickel (or matte) and elemental sulphur, to produce a low-moisture (low-arsenic) precipitate suitable for standard nickel-copper processing.
The process was successfully piloted at Inco's Manitoba Division between September 1990 and June 1991. The copper arsenate product typically analyzed 43 % Cu and 25 % As, and the moisture content was about 10%.
Keywords: Process development, Copper arsenate process, Arsenic management, Inco Manitoba Division.
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Publication: CIM Bulletin
Author(s): R.E. Mclvor
Issue: 988
Volume: 88
Year: 1995
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Publication: CIM Bulletin
Author(s): Douglas McDonald, Richard Poulin
Keywords: Gainsharing plans, Human resources.
Issue: 988
Volume: 88
Year: 1995
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Summary: Finance Minister Paul Martin's second budget might be good for Canada's mining industry in the long run, but the budget raises a number of concerns for the industry in the near term. The budget papers suggest that the 25% resource allowance is not working as intended, and report that the Department of Finance will be reviewing this valuable allowance. The so-called "large corporations tax" rate will be increased. This annual tax, which is imposed on a corporation's capital even when...
Publication: CIM Bulletin
Author(s): Robert B. Parsons
Issue: 988
Volume: 88
Year: 1995
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Summary: The mining industry is taking advantage of the increased performance resulting from the use of variable speed AC drives for large motors. This technology provides increased efficiency under the variable speed and torque requirements of such drives as mine hoists, conveyors, and air moving equipment. The technology does introduce voltage spikes on the voltage wave form that stress the insulation system to a greater degree than would occur with a constant voltage source. These voltage spikes...
Publication: CIM Bulletin
Author(s): R.H. Rehder, M.E. Stutt
Keywords: Equipment, AC drives, Mine hoists, Conveyors, Air moving equipment.
Issue: 988
Volume: 88
Year: 1995
Text
Summary: This paper presents the results of structural analyses and full-scale destructive tests conducted on liner plate culverts. The purpose of this work was to establish a design method and evaluate the suitability of using these structures in potential roof-fall areas for a rehabilitation application in lower stress and relaxed mining environments. Field evaluation of the design is currently in progress.
Theoretical ultimate resistance functions were established for two different culvert shapes...
Publication: CIM Bulletin
Author(s): Roy El. Durr, Glen R. Davidge
Keywords: Rock mechanics, Underground mining, Structural analysis, Destructive testing.
Issue: 988
Volume: 88
Year: 1995
Text
Summary: The sillimanite group minerals, kyanite, sillimanite and andalusite are identified as alumina-silicate minerals with the common chemical composition Alf)3.SiO2, so that each possesses similar physical properties. Kyanite is the most abundant mineral and mainly occurs in Quebec, Ontario and British Columbia; sillimanite occurs in Ontario and Manitoba; and andalusite in Nova Scotia.
The main use for the sillimanite-group minerals is in refractory applications for the production of refractory...
Publication: CIM Bulletin
Author(s): P.R.A. Andrews
Keywords: Industrial minerals, Silicates, Refractory silicate minerals, Kyanite.
Issue: 988
Volume: 88
Year: 1995
Text
Summary: A support system for large ground convergence conditions or burst-prone ground must contain holding elements (rockbolts, cable bolts, etc.) that are strong yet capable of sustaining large deformations, i.e., they must absorb as much energy as possible. Steel wire rope anchored in a borehole by a friction bolt provides these desired yield characteristics if the factional anchorage is placed deep enough into the rockmass, i.e., in non-yielding rock or beyond the expected depth of rock ejected...
Publication: CIM Bulletin
Author(s): D.D. Tannant, P.K. Kaiser
Keywords: Rock mechanics, Frictional anchorages, Rockbursts, Swellex bolts, Cables, Wire ropes, Pull-out tests, Energy absorption.
Issue: 988
Volume: 88
Year: 1995
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