Transformations of pyrite in different associations during pyrolysis of coal

摘要: Abstract The samples of pure pyrite, the mixtures FeS2 or FeS loaded on a low-ash coal char, and an acid-washed with high content pyrite were used to investigate transformations different physical associations during pyrolysis. presence although affected evolution sulfur-containing gases in vapor phase, had little influence thermal decomposition at 450–650 °C. Pyrite conversion above 920 °C, especially transformation formed into elemental iron, was facilitated primarily by char matrix entity. During pyrolysis coal, isolated agglomerates single crystals transformed individual aggregates gaps coke grains, while most embedded particles located edge decomposed Fe–S phases which remain inside closely contact carbon matrix. Meanwhile low-sulfur products mainly represented as FeSy (0