Anthracite, also known as hard coal and black coal, is a hard, compact variety of coal that has a submetallic lustre. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals.

硬煤为烟煤、无烟煤的统称，指恒湿无灰基高位发热量大于或等于24MJ/kg的煤。 黑色有强光泽，以指摩擦不致沾污，比重在1.7以上。

There are four major types (or “ranks”) of coal. Rank refers to steps in a slow, natural process called “coalification,” during which buried plant matter changes into an ever denser, drier, more carbon-rich, and harder material. The four ranks are: Anthracite: The highest rank of coal.

無煙煤 （anthracite、 希臘語： ανθρακίτης，意為「類煤」，衍生於「木炭」的希臘語 άνθραξ） [1]，也稱為 黑煤 、 硬煤 （英語： black coal, hard coal），是一種堅硬、緻密且高 光澤 的 煤 礦品種。 在所有的煤品種中， 變質作用 的程度最高，具有高的熱含量和 碳 含量，以及最少的雜質。 ^ "anthracite," The Oxford English Dictionary. 2nd ed. 1989. OED Online. Oxford University Press. Retrieved 2010-06-26. [1] [ 失效連結] Anthracite.

2025年4月4日 · Hard and brittle, anthracites break with conchoidal fracture into sharp fragments. Unlike many bituminous coals, they are clean to the touch. Although anthracites are difficult to ignite, they burn with a pale blue flame and require little attention to sustain combustion.

无烟煤 （anthracite、 希臘語： ανθρακίτης，意为“类煤”，衍生于“木炭”的希腊语 άνθραξ） [1]，也稱為 黑煤 、 硬煤 （英語： black coal, hard coal），是一种坚硬、致密且高 光泽 的 煤 矿品种。 在所有的煤品种中， 变质作用 的程度最高，具有高的熱含量和 碳 含量，以及最少的雜質。 ^ "anthracite," The Oxford English Dictionary. 2nd ed. 1989. OED Online. Oxford University Press. Retrieved 2010-06-26. [1] [ 失效連結] Anthracite.

2021年9月1日 · 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 third-ranked producers—the U.S. at 932 ...

Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis. It is often subdivided into semi-anthracite, anthracite, and meta-anthracite on the basis of carbon content. Anthracite is often referred to as "hard coal"; however, this is a layman's term and has little to do with the hardness of the rock.

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2015年1月30日 · hard coal [英][hɑrd kəul][美][hɑː(r)d kol] 硬煤，无烟煤; 白煤; 例句 1.Soft coal burns with more flames than hard coal. 烟煤燃烧时火焰较无烟煤多。 2.Finally great depth of burial, long time and higher temperature may metamorphose the lignite into soft coal or bituminous coal and in extreme cases, to hard coal or ...