Uncleaned coal

…The products that are separated and removed during the coal washing process and discarded are called waste. Coal that is shipped after only simple processing such as crushing and sieving is called unwashed coal. Raw coal received at the coal washing plant is roughly separated into free particles and crushed to a particle size of 50 to 100 mm or less, which is suitable for the washing process. …

*Some of the terminology used to refer to "uncleaned coal" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…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。破砕，ふるい分けなどの簡単な処理のみにより出荷される商品炭は未選炭uncleaned coalと呼ばれている。　選炭工場に受け入れられた原炭は，およその粒子が単体分離され，また選別過程に適した粒度の50～100mm以下にまで破砕される。…

※「uncleaned 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