Analisis Sebaran Kualitas Batubara Seam C dan D Berdasarkan Kadar Air, Abu, Zat Terbang, Karbon dan Nilai Kalori Daerah Konsesi Pertambangan PT. Manggala Alam Lestari, Kecamatan Bayung Lencir, Kabupaten Musi Banyuasin, Sumatera Selatan

Abstract

Coal, also mentioned as coal deposite sediment, is a sediment which contains accumulation of organic material from lithification residual plant. Those materials has been compacted, chemically altered, and methamorphic process in geologic time scale. The processes is caused by the younger deposite burden, temperature, pressure and time. To define the coal quality is by using chemical analysis which are proximate analysis, ultimate analysis, and maceral analysis. This research devines from the proximate analysis to notice weight percentage of the calorific values, volatile matter, ash, carbon content, and inherent moisture. Suitable methods for this research are survey method, descriptive, and analytical. Data processing involves computerizing process by graphic software to correlate stratigraphically and distribution map of coal quality anomalies on several bore holes in the researched field. The distribution of seam C and D on researched field continues with strike position southwest – northeast and intercalation for 2 – 3 m thick. Dominan factors which caused coalification process at seam C and D is organic suply (vegetations). Rate of quality value of seam C contains 42.31 % of total moisture for relative distribution at northwest and southeast, 13.76 % of inherent moisture for relative distribution to southwest, 15.77 % of ash content for relative distribution at northwest and middle map, 41.68 % of volatile matter for relative distribution to south, 28.85 % of fixed content for relative distribution at west – northwest and east, and 4826,27 cal/gr of calor value at west and east. While rate of quality value of seam D contains 41.09 % of total moisture for relative distribution at northwest, 14.12 % of inherent moisture for relative distribution to northwest, 15.44 % of ash content for relative distribution at southeast, 39.91 % of volatile matter for relative distribution to east, 30.53 % of fixed content for relative distribution at northwest and east, and 4520.52 cal/gr of calor value at west and east. Based on the calculation and coal classification of A.S.T.M. (American Society for Testing and Materials), seam C produces calorfic value 8687.54 Btu/lb ranhed as subbituminous coal. While as seam D produces calorfic value 8136.54 Btu/lb ranhed as lignite A.