Demineralisation of a semianthracite char with molten salts/HCl: A study by X-ray diffraction |
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Authors: | M Alfaro-Domínguez F Sánchez Bajo |
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Institution: | Departamento de Electrónica e Ingeniería Electromecánica, Escuela de Ingenierías Industriales, Universidad de Extremadura, Avda de Elvas s/n, 06071 Badajoz, Spain |
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Abstract: | The effects of chemical heat treatments of a semianthracite char (AC) on the composition of the mineral fraction of the material are investigated. The starting char was first treated with a mixture of LiCl/KCl or LiCl/KCl/CaO at 743, 873 or 1173 K and the products obtained were then washed thoroughly with distilled water. A small fraction of these samples were treated with 10−3 M HCl solution. The composition changes were studied by X-ray diffraction. The predominant mineral components initially present in the starting char are quartz, mullite, muscovite and/or kaolinite and oldhamite. The treatments of AC resulted in significant changes in the mineral fraction of the material, in particular when LiCl/KCl/CaO was used. In this case, spurrite, γ-calcium orthosilicate and gehlenite were formed, which were eliminated by treatment with 10−3 M HCl solution. |
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Keywords: | 61 10 &minus i 61 66 Fn |
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