Conversion of caking coal into non-caking coal by treatment with sulphur and sulphur dioxide |
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Authors: | Hiroshi Fukudome Ho Huu Thoi Masashi Iino Hiroji Iwasaki |
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Affiliation: | Chemical Research Institute of Non-aqueous Solutions, Tohoku University, Katahira 2- Chome, Sendai, 980 Japan |
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Abstract: | The effects on the caking properties of coals of reaction between the coals and S8 and SO2, have been studied. Caking coals (Akabira, Shinyubari, Zollverein, Indian Ridge, and Big Ben) lose their caking properties when treated with S8 above 200 °C. For Shinyubari coal the crucible swelling number decreases from to 2 with treatment temperature of 235°C in which 5% of S is incorporated into the coal. The decaking of coal is attributed to thio-ether cross-linkages. Caking coals also lose completely their caking property when reacted with SO2 at 170 °C. The decaking action of SO2 is attributed to oxidation of coal in which ether cross-linkages are formed. |
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