Survey Research for Developing Highly-Efficient Upgrading Technology of Brown Coals Mined in Asia and Oceania

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Low rank coals such as brown coals are abundant but it is generally difficult to transport and store due to their high spontaneous combustibility. Therefore, it is necessary to develop upgrading processes of brown coals which will be utilized at the coal mines so that Japan can use such an abundant resource. In order to develop highly-efficient and environmentally-friendly processes, wehave to understand current situations of mining, pretreatment, and environmental measure at the coal mines. In this research, we visited several brown coal mines in Asia and performed a survey on mining method, pretreatment method, and environmental measure