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.

Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. [1]

石煤（stone-like coal）是一种含碳少、低热值的燃料，也是一种低品位的多金属共生矿。 石煤由4亿至5亿年前地质时期的菌藻类等生物遗体，在浅海环境下经腐泥化作用和煤化作用转变而成。

2023年8月15日 · Coal is a non-clastic sedimentary rock. They are the fossilized remains of plants and are in flammable black and brownish-black tones. Its main element is carbon, but it can also contain different elements such as hydrogen, sulfur and oxygen. Unlike coal minerals, it does not have a fixed chemical composition and crystal structure. Depending on ...

2025年1月20日 · Anthracite, the most highly metamorphosed form of coal and the least plentiful form. Anthracites are black to steel gray and have a brilliant, almost metallic luster. They can be polished and used for decorative purposes.

Coal is an organic sedimentary rock that forms from the accumulation and preservation of plant materials, usually in a swamp environment. Coal is a combustible rock and, along with oil and natural gas, it is one of the three most important fossil fuels. Coal has a wide range of uses; the most important use is for the generation of electricity.

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.

1987年1月1日 · The gasification of stone coal (bituminous shale) is an important way to make rational use of its thermal energy, increase its heat efficiency and prevent pollution. The principle by which stone coal and stone waste gas boilers make gas is basically the same as when coal gas is made in ordinary boilers.

2017年9月21日 · Based on Chinese Standard (GB/T15663.1-2008 GB/T. 2008), stone coal (also referred to as stone-like coal) is a combustible, low-heat value, high-rank sedimentary rock mainly derived from early P...

2024年12月20日 · Coals are the most abundant organic-rich sedimentary rock. They consist of undecayed organic matter that either accumulated in place or was transported from elsewhere to the depositional site. The most important organic component in coal is humus. The grade or rank of coal is determined by the percentage of carbon present.