Comparison Study for Domestic Coal and Material Characteristics of Coal from the Shipwreck of Koryo Dynasty

Abstract

This study analyses geochemistrical, microscopic, mineralogical characteristics of coals which have been collected from in and out of the shipwreck No 1 of Mado island during underwater excavation in Taean. The result from mineralogical and geochemical analysis reveals that the specific gravity of the coals is 1.28g/cm 3. Considering that coals contains 10% mineral of it and the specific gravity of the pure is 1.15g/cm 3 , it is believed that the collected coals would be lignite or biturminous coal. The X-ray diffraction analysis which displays the peak of 2θ is 20~25C degree, proves that the collected coals would be categorised as low rank coal. The collected coals is composed of: 93%-94%(93.5%) of vitrinite maceral group, 5%-6%(5.5%) of exinite maceral group, and 1% of inertinite maceral group. In addition, the average of reflection rate is Rmean: 0.627 showing that it would be either high volatile bituminous C coal or sub-bituminous C coal. Such result confirms that the coal is sub-bituminous C or high volatile bituminous C coal in accordance with the U.S Bureau of Mine(USBM) classification system. The element analysis reveals that the coal is the coking coal which