Abstract
It is important to investigate in detail the mineralogical properties of the mineral matters in coal, for the application of advanced coal cleaning techniques such as column flotation, oil agglomeration and chemical cleaning.In this paper, existing state of mineral matters, including sulfur component in Miike coal is investigated for getting basic data to produce ultra-clean coal.50% particle size of mineral matters is 5.4 μm in the Miike coal pulverized to -500μm. Quartz and albite exist mostly in the higher range of specific gravity in coal sample and concentrated in a part of degradinite. In contrast, montmorillonite, kaolinite and calcite exist in the middle and lower ranges. Although, the majority of the former two minerals could be rejected by commonly used physical cleaning methods, it would be necessary to apply some advanced coal cleaning techniques, in order to reject the latter three minerals finely dispersed in coal matrix.Approximately 1/3 of total sulfur in Miike coal exist in the form of iron sulfide, which is composed of pyrite and marcasite. The iron sulfide particles of +100 μm almost consist of pyrite. The proportion of pyrite/marcasite is 4/3 and 50% particle size of these minerals is 20pm, in the fraction of-50 pm size range, which indicating that the physical cleaning could be applied to reject them with relative ease. Organic sulfur, occupying 2/3 of total sulfur, is uniformly dispersed in coal substance, then it is necessary to apply some chemical cleaning methods for the rejection.
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