Arsenic is one of the toxic trace elements in coal, it greatly harms the environment and the human body. Combustion of coal will accompany arsenic release, so it is necessary to understand the release rule of high-as coal in the process of coal combustion. This paper chose three high arsenic (more than 120ppm) coals which came from the southwestern part of Guizhou province in China. The high temperature combustion experiment was conducted in muffle furnace under the temperature of 800°C, 1000°C, 1200°C and 1400°C, respectively. The analysis methods in this study include TGA, XRD, XRF, FESM-EDS and ICP-MS. The high-temperature ash (HTA) products were characterized to determine the mineral compositions, chemical compositions, mineral morphology and arsenic content. The research results showed that in the process of coal combustion, the arsenic release rate of LT-K1 coal and JL-CQ coal was 35.8% and 38.8% at the temperature of 800°C, respectively, while arsenic release rate of these two kinds of coal had a bigger increase at the temperature of 1000°C, were 85.6% and 91.1%. The arsenic release rate of LT-D2 coal had a bigger increase at the temperature of 1400°C. The arsenic release rate had a big difference with the temperature increasing, it may owe to the transformations of minerals and mineral phases.
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