Anthracite, commonly known as white coal or red coal, is the most highly metamorphosed coal variety. It is hard, dense and features a metallic luster, with a carbon content of over 80% and a volatile matter content of less than 10%. It has few impurities and low pollution, and when burned, it produces a blue flame with almost no smoke. As a natural clean energy source, it boasts stable chemical properties and is not prone to spontaneous combustion. It is not only suitable for civil applications such as clean heating in northern China during winter and food processing, but also plays an important role in industrial fields including chemical engineering (for the production of synthetic ammonia and methanol), metallurgy (blast furnace injection) and power generation. China is a major producer and reserve holder of anthracite, with its main deposits distributed in Shanxi, Henan, Guizhou and other provinces.