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Low grade coal
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…The intermediate-quality product is called “middlings.” The term “low-grade coal” is also used for low-quality coal. The product that is separated and removed during the coal washing process and discarded is called waste rock. … *Some of the terminology used to refer to "low grade coal" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
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…また中間品質の製品を二号炭middlingsという。低品質の石炭に対しては低品位炭low grade coalという言葉も用いられる。選炭過程によって分離･除去され，廃棄される産物を廃石という。… ※「low grade coal」について言及している用語解説の一部を掲載しています。 出典｜株式会社平凡社世界大百科事典 第２版について | 情報 |
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