Microsilica dust in the ferrosilicon industry

Abstract Possible mechanisms of microsilica dust formation and factors affecting its quantity have been discussed. General mathematical models to predict the dust quantity based on electrical and coke consumptions, and flue gas temperature as functions of silicon recovery in the process and silicon content of the alloy have been established. It has also been shown that the flue gas temperature can be used as an additional process control parameter. Comments are made on the effect of the dust formation on the whole process economics and it is pointed out that the formed microsilica dust is a valuable by-product and not an industrial waste.
Keywords: Metallurgy, Silica dust, Ferrosilicon industry, Dust formation, Ferroalloys, Electric arc furnace
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Summary: In order to define the ore/waste boundaries as finely as possible, mine planners often insist on kriging very small blocks (relative to the spacing of the available sample grades). These kriged estimates for very small blocks are over-smoothed. For several simple sampling patterns the relation between the block size and the variogram range, and the kriging results were studied. Meaningful estimates of individual blocks are obtained when the variogram range is large compared to the block size...
Publication: CIM Bulletin
Author(s): Margaret Armstrong, Normand Champigny
Keywords: Geostatistics, Ore reserve estimation, Kriging
Issue: 923
Volume: 82
Year: 1989
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Summary: The recovery and separation of platinum-group metals (PGM) from primary and secondary materials currently attracts a lot of interest due to the high value of the metals and their increasing demand for high-tech applications. Thus, the traditional refining processes are gradually replaced by newer more efficient separation techniques such as solvent extraction and ion exchange. In this paper the classical and modern refining techniques are reviewed and the pertinent solution chemistry...
Publication: CIM Bulletin
Author(s): G.P. Demopoulos
Keywords: Hydrometallurgy, Platinum-group metals, Refining Processes, Separation techniques, Solvent extraction
Issue: 923
Volume: 82
Year: 1989
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Summary: Laboratory testing, by Lakefleld Research determined that, in spite of the relatively high pyrite content of the Golden Rose (OR) orebody, it would respond well to gravity concentration followed by either direct cyanidation or cyanidation of a flotation concentrate.
Economics favoured the former choice which became the adopted process flowsheet.
During the latter stage of the feasibility study, the Dekalb 500 tpd copper flotation mill became available in the Highland Valley of British...
Publication: CIM Bulletin
Author(s): Gary Hawthorn
Keywords: Equipment design, Mineral processing, Concentrator design, Emerald Lake concentrato
Issue: 923
Volume: 82
Year: 1989
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Summary: As sulphide ores are usually concentrated by flotation, the material is very finely ground (< 37 pm), wet and impregnated with the chemicals used in flotation. These conditions are favourable to the development of chemical reactions which are largely influenced by atmospheric conditions (temperature, humidity, wind, etc.) as well as by the geometry of the piles.
Physical and chemical properties of a chalcopyrite concentrate were determined by laboratory tests. The knowledge of these...
Publication: CIM Bulletin
Author(s): R.A. Guedes de Carvalho, C.G. Gonzalez Beca, M.N. Sampaio, O. Neves, M.C. Sol Pereira, H. Sousa Vale
Keywords: Mineral processing, Chalcopyrite, Transportation, Storage, Flotation
Issue: 923
Volume: 82
Year: 1989
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Summary: The 1980s have proven extremely difficult years for many resource-based organizations. Mining companies have learned how to weather the negative effects of inevitable economic cycles. However, with some notable exceptions, such as gold mining companies, the mining industry has faced a broader and deeper round of cutbacks than any experienced since the 1930s. Downsizing has been a major issue for many mining companies as they have faced the need for dramatic staffing cost reductions in the...
Publication: CIM Bulletin
Author(s): John Stoten
Keywords: Downsizing, Mineral economics, Human resources
Issue: 923
Volume: 82
Year: 1989
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Summary: The Edmonton region accounted for 40% of Alberta's sand and gravel production in 1981 (about 12 million m3). Most of this production was by commercial operations (75%) for use in essential public works projects (64% in road and asphalt production).
Although the Alberta Geological Survey delineated 1157 million m3 of gravel, a number of areas are considered to be in short supply. An econometric model was used for forecast demand in the region. Predictions, based on this forecast and estimated...
Publication: CIM Bulletin
Author(s): W.A.D. Edwards
Keywords: Industrial minerals, Aggregates, Mineral deposits, Sand, Gravel
Issue: 923
Volume: 82
Year: 1989
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