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transformation of coal and types of coal

Jan 29, 2020018332Types of Coal . Hard vs. Soft Coal falls into two main categories hard and soft. Soft coal is also known as brown coal or lignite. China produces more hard coal than any other country by a factor of about three. The whopping 3,162 million metric tons of hard coal produced by China dwarfs the output of the second and thirdranked producers ...

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