thermal coal, coking coal, metallurgical coke.
Coking coal is the main raw material used in the production of coke, which is in turn used as fuel for the production of steel.
Thermal coal is used for power generation, while coking coal for the production of coke. Due to the different chemical compositions, coking coal is priced higher than thermal coal.
extracted from:
http://www.theedgedaily.com/cms/content.jsp?id=com.tms.cms.article.Article_5237d92f-cb73c03a-39060b00-e77829a0
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