Thermodynamic and technico-economic analyses of the HCl-leach of magnesite and serpentine

Abstract Commercial HCl-leaching of magnesite and serpentine yields highly concentrated aqueous solutions containing 25 mass % to 33 mass % MgCl2. The partial molar enthalpies and heat capacities, the ionic activities of Mg2+ and ClÐ, and the Raoultian activity of H2O have been assessed for the concentrated MgCl2-H2O solutions at temperatures of 348 to 373 K. These thermodynamic data are used to calculate the pH of aqueous MgCl2 solutions saturated with a Mg-bearing mineral such as magnesite, serpentine, brucite, forsterite, enstatite or talc. On the basis of these thermodynamic data, technico-economic aspects are discussed as to neutralization with pulverized MgCO3, water evaporation from the MgCl2 solutions, and ore composition including such minor constituents as CaCO3, FeCO3 and Fe3O4.
Keywords: Metallurgy, HCl leaching, Magnesite, Serpentine, Thermodynamic analysis, Technico-economic analysis.
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Summary: The paper discusses the accuracy of magnetic inspections of corroded hoist ropes. It quantifies the error of measured LMA (loss of metallic area) caused by presence in the rope of ferromagnetic products of corrosion. The paper concludes that in mining practice this error is not significant.
Publication: CIM Bulletin
Author(s): T.S. Golosinski
Keywords: Equipment, Maintenance, Hoist Ropes, Corrosion.
Issue: 1034
Volume: 92
Year: 1999
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Summary: The induration of iron ore pellets has always utilized prefired pellets to protect the pallet cars from the environment of the induration furnace. This paper presents the process used to obtain superior upper sidewalls. These heat resistant castings are used on induration pallet cars, and their life improvements by as much as 400% is a significant step towards the reduction of the prefired (or hearth layer pellets.) The benefit to the industry in the removal of the hearth layer is improved...
Publication: CIM Bulletin
Author(s): J.R.D. Gravel
Keywords: Pallet Cars, Equipment, Heat resistant casings, Induration of iron ore pellets.
Issue: 1034
Volume: 92
Year: 1999
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