1. Technical Center for Industrial Product and Raw Material Inspecting and Testing of Shanghai Customs, Shanghai 200135, China; 2. College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China; 3. Comprehensive Technology Service Center of Shengsi Customs,Shengsi 202450, China
Abstract：Indonesia is the largest source country of imported coal in China, and its coal resources are mainly concentrated in Sumatra Island and Kalimantan Island. The quality characteristics, trace element characteristics and geological genesis of Indonesian coal were summarized. The results showed that Indonesian coal had the quality characteristics of high moisture, low ash, low sulfur and high volatile matter, and its trace element content was generally lower than the average value of the world coal, showing the characteristics of ultra-low fluorine, ultra-low phosphorus, ultra-low chlorine, ultra-low arsenic and ultra-low mercury. Indonesia is located near the equator, and its unique peat environment is an important reason for high moisture, low ash content, low sulfur content, high volatile matter and low trace element content of Indonesian coal. In addition, the intrusion of igneous rock, volcanic ash and seawater could also cause great differences in the quality and trace element of Indonesian coal in local area. The comprehensive utilization of imported Indonesian coal was prospected from the aspects of coal blending and burning, clean utilization, etc. It was suggested to carry out the scientific evaluation according to different blending and burning scenarios. Moreover, the clean utilization of inferior coal in local areas should be paid attention to. Due to the differences of paleoenvironment and geological origin, the trace element content of coals from different origins had the characteristic of "fingerprint", which could be applied to the origin tracing of Indonesian coal.
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