Bituminous coal - Lexeitan

A coal whose coalification rank is between subbituminous and anthracite. It is black in appearance and is a typical type of coal. It is called bituminous coal because it produces bitumen (asphalt and pitch-like substances) during pyrolysis. The carbon content determined by elemental analysis is less than that of anthracite, but is roughly in the range of 80-90% by mass (daf). It has the highest caking property among coals, so it is used as a raw material for coke production, and strongly caking bituminous coal is particularly important. According to the JIS standard, it is broadly divided into two types, with calorific values ​​on an anthracite and dry basis (daf) of 34-35 MJ kg ^-1 and 35 MJ kg ^-1 or more, the latter being called strongly caking coal. The former, which has low caking property and a high volatile content, is used as fuel for power generation. The total production of hard coal (2001) was approximately 3.8 billion t, and bituminous coal accounts for the majority of this. [See alternative terms] Elemental analysis of coal

Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition

石炭化度が亜歴青炭と無煙炭の間に位置する石炭．外観は黒色で石炭の代表的なもの．熱分解時に歴青(アスファルトやピッチ状物質)を発生するので歴青炭とよぶ．元素分析による炭素量は，無煙炭より少ないが，大まかには80～90質量％(daf)の範囲にある．石炭のなかでは，粘結性がもっとも大きいので，コークス製造用原料に用いられ，とくに，強粘結性歴青炭は重要である．JIS規格では，無水・無灰基準(daf)の発熱量が34～35 MJ kg^－1 と35 MJ kg^－1 以上の2種類に大別され，後者は強粘結炭とよばれる．粘結性が小さく揮発分の多い前者は発電用燃料に用いられる．ハードコールの全生産量(2001年)は約38億 t で，歴青炭はその大部分を占める．[別用語参照]石炭の元素分析

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