Improved control of fuming and reverberatory furnace operation by rapid slag analysis

Abstract An X-Met Analyzer was purchased from Outokumpu in late 1983 for use in the Hudson Bay Mining and Smelting smelter. Its first use was in the fuming plant to give zinc assays of each charge of slag tapped from the fuming furnaces. This quickly told the operators exactly when each charge had reached its economic tap-out point, and gave supervision a fool-proof method of identifying good operation. These and other factors led to major improvements in coal utilization in thefumers and to major increases in zinc oxide production. A second unit was later purchased for the reverberatory furnace to give silica and iron assays of the slag, and these were used to make adjustments in the feed composition to maintain the desired SiO^Fe ratio in the slag. Since purchasing the units for the furnace, the oil consumption and copper content of the slag have dropped significantly.
Keywords: Metallurgy, Pyrometallurgy, Hudson Bay Mining and Smelting smelter, X-Met analyzer, Fuming furnaces, Coal utilization, Equipment.
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Publication: CIM Bulletin
Author(s): P.J. HANNON, D.M. DOYLE
Keywords: Mineral processing, Research and Development, Nova Scotia Development Agreement, Geoscience, Minerals technology, Development, Public information.
Issue: 907
Volume: 80
Year: 1987
Text
Summary: Rock rejection during the flotation of a copper-nickel ore was improved by adding carboxymethyl cellulose to both a rougher and cleaner flotation stage. The selection of the rock depressant was based on laboratory rates studies. Plant operating results are presented which confirm the laboratory selection of two particular brands of carboxymethyl cellulose. The rock assay of the concentrate was reduced from more than 40% to less than 15%.
Publication: CIM Bulletin
Author(s): GORDON E. AGAR, GREGORY H. STYLES
Keywords: Mineral processing, Flotation, Kinetics, Sulphide mineral flotation.
Issue: 907
Volume: 80
Year: 1987
Text
Summary: Continuous pressure filtration is a modern process for the mechanical dewatering of flotation concentrates of coal and similar coal slurries. This method will give a lower moisture content than classical vacuum filtration, the improvement lying in the range 5% to 15%. Eighteen coal slurries have been examined in this survey. They are representative of a wide spectrum of filtered slurries.
Publication: CIM Bulletin
Author(s): M. DOSOUDIL
Keywords: Coal preparation, Coal flotation, Slurries, Pressure filtration, Dewatering, Filtration, Preparation plants.
Issue: 907
Volume: 80
Year: 1987
Text
Summary: There is a widespread concern that certain of Finance Minister Michael Wilson's Tax Reform proposals will likely lead to a significant decline in flow-through funding after 1988. This does not bode well for the junior exploration sector, which relies heavily on flow-through to finance exploration programs. The exploration industry is actively pursuing various solutions to the problems posed by Tax Reform, in order to ensure that flow-through has a future.
Publication: CIM Bulletin
Author(s): ROBERT B. PARSONS
Issue: 907
Volume: 80
Year: 1987
Text
Summary: The paper reviews state-of-the art welding processes and consumables for structural and pressure equipment applications in offshore environments, particularly the Arctic. Optimum selection of consumables will be discussed with regard to the facility to meet tentative toughness requirements in weld-ments. Finally, the development of welding procedure specifications will be considered in relation to the prevention of hot or cold cracking and lamellar tearing.
Publication: CIM Bulletin
Author(s): J.C. PRICE
Keywords: Welding metallurgy, Metallurgy, Offshore technology, Arctic, North West Alaskan pipeline, Pipelines, Hydrogen cracking, Lamellar tearing.
Issue: 907
Volume: 80
Year: 1987
Text
Summary: Recovery of precious metals associated with a sulphidic matrix has an important economic effect on complex sulphide ore treatment. Because a significant portion of the silver and gold associated with pyrite are rejected to tailings during the selective flotation of pyritic Zn-Pb-Cu ore, other ore processing routes have been investigated.
Direct leaching of the ore with ferric sulphate solution followed by separation of different components of the solid suspension by flotation was applied....
Publication: CIM Bulletin
Author(s): FRANCISZEK LETOWSKI
Keywords: Hydrometallurgy, Leaching-flotation process, Flotation, Recovery processes, Ore processing, Delta region, Extraction metallurgy.
Issue: 907
Volume: 80
Year: 1987
Text
Summary: Northgate Patino Mines produces a copper concentrate assaying 22% Cu. Moisture content of the product averages 12.5% H2O when dewatering with conventional vacuum disk filters. Recent smelter contracts reflect higher energy costs and increased moisutre penalty charges. This situation forced Northgate to investigate possible alternatives such as rotary dryers and pressure filtration. After laboratory testing, it was found that pressure filtration could economically meet the smelter's requiremen...
Publication: CIM Bulletin
Author(s): G. LADOUCEUR
Keywords: Mineral processing, Dewatering, Copper concentrate, Northgate Patino mines, Copper Rand dewatering.
Issue: 907
Volume: 80
Year: 1987
Text
Summary: A conductivity probe mounted in the shell of the mill has been used to measure the behaviour of the load in the mill as a function of operating variables. It was found that certain properties of the conductivity signal correlate strongly with the per cent solids of the slurry passing through the mill; in particular the angular location 6D of the shoulder of the load is an increasing function of the per cent solids. A method for measuring the viscosity of the pulp discharging from the mill has...
Publication: CIM Bulletin
Author(s): M.H. MOYS, A. MONTINI
Keywords: Mineral processing, Grinding mills, Mill operation, Slurry rheology, Milling circuits, Computer control.
Issue: 907
Volume: 80
Year: 1987
Text
Summary: The Ferderber gold deposit is of Archean age. It consists of a series of gold-bearing quartz lenses within a shear zone that crosscuts the central part of the quartz dioritic Bourlamaque batholith. On average, this zone strikes N70E and dips 65SE.
The Ferderber shear zone, which hosts the ore lenses, has been affected by a succession of tectonic events. A possible early period of brittle shear, accompanied by the formation of quartz lenses, resulted from strike slip movement along the zone....
Publication: CIM Bulletin
Author(s): L. VU, R. DARLING, J. BELAND, V. POPOV
Keywords: Structural geology, Gold deposits, Ore reserves, Exploration, Economic geology, Ferderber gold deposit.
Issue: 907
Volume: 80
Year: 1987
Text
Summary: The Swayze gold mine is an Archean vein deposit in northern Ontario. The veins are superimposed on a conjugate joint system and are contained within an anastomosing alteration envelope in a metadiorite body. Reserves were estimated on the basis of fire assays of channel samples and carload samples from underground mine openings, surface and underground diamond drilling and surface trenching. A semivariogram constructed from channel samples along one of the drifts yielded a horizontal,...
Publication: CIM Bulletin
Author(s): G. HARPER, F.T. MANNS
Keywords: Orofino, Swayze, Ontario, Archean volcanics, Diorite, Gold, Quartz veins, Alteration, Structure, Ore controls, Reserves, Calculations, Computer.
Issue: 907
Volume: 80
Year: 1987
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