Dry Coal Preparation of Fine Particles by KAT Process
In this study, effectiveness of KAT Process, dry coal preparation process developed by KIGAM (Korea Institute of Geoscience and Mineral Resources), was assessed for bituminous coal from MAK-Naryn Sukhait (NS) coal mine, Mongolia. 1-25 mm raw coal delivere
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Korea University of Science and Technology (UST), 217 Gajungro, Yuseong-gu, Daejeon 305-350, Korea Korea Institute of Geoscience & Mineral Resources (KIGAM), 92 Gwahang-no, Yuseong-gu, Daejeon 305-350,Korea Hanbit Korea Standard Engineering Co.,Ltd, 39, Jungsansaneop-ro, Buk-gu,Ulsan,Korea Mongolyn Alt Corporation (MAK),44 Chinggis Avenue, Khan Uul district, 1 khoroo, Ulaanbaatar, Mongolia
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Abstract In this study, effectiveness of KAT Process, dry coal preparation process developed by KIGAM (Korea Institute of Geoscience and Mineral Resources), was assessed for bituminous coal from MAKNaryn Sukhait (NS) coal mine, Mongolia. 1-25 mm raw coal delivered from Mongolia was screened and classified with 1-5 mm, 5-10 mm, 10-20 mm, and over 20 mm particle size range. Separation tests were conducted for 1-5 mm and 5-10 mm size fractions using two types of pilot scale KAT Process units, suitable for each size range. Prepared test samples were concluded as well liberated samples having less than 3 % of weight material between specific gravity range of 1.6 to 2.0 g/cm³. Test results conducted under optimum conditions observed at previous investigations. Overall, the average ash rejection and combustible recovery for 1-5 mm fraction was 81% and 77% respectively and the feed ash content was decreased from 35% to 12% in product and the average product yield was 56.3%. The 5-10 mm size fraction average ash content was 48.4%. After the dry separation, about 41% of the feed was recovered as product with average 9.4% ash content. Ash rejection and combustible recovery was 91.7% and 76.8% respectively. Conducted tests showed that KAT process can effectively remove large amount of dense impurities from low grade coal thus producing an acceptable ash content clean coal product. Keywords : Low grade coal, Dry coal beneficiation, Air table, Autogenous medium
1. Introduction Coal is the one of the main fossil fuel for energy and most of worldwide energy consumptions still depend on coal. Coal needs to be cleaned from its gangue minerals in order to increase its quality and to meet the industrial standards through many kinds of coal beneficiation techniques. Today the dominant coal beneficiation technologies mostly rely on wet methods which requires huge amount of process water and inescapable high operation cost during processing procedures. Waterless coal beneficiation technologies have some notable advantages compared to wet technologies. The dry beneficiation methods are based on the differences in physical properties between coal and mineral matters such as density, size, shape, lustrousness, magnetic susceptibilities, electrical conductivity, frictional coefficients. [4]. The dry coal-cleaning separators can be broadly classified into three groups: air tables, air jigs, and dry dense medium separators [5]. Optical sorting, magnetic and electrostatic separators also considered as part of the dry processes. Dry preparation of coal can be economical by reducing capital and operational costs. It will not utilize water and no dewat
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