Metallurgical coal

Metallurgical coal is coal of a sufficient grade for use in steel production. Steel smelting and other metallurgical processes use coking coal or coke, made by heating bituminous coal in an oxygen deficient environment to reduce mineral impurities (e.g. less sulfur, phosphorus). Some grades of Anthracite coal are used for sintering, PCI, direct BF charge, pelletizing, and in production of ferro-alloys, silicon-manganese, calcium-carbide and silicon-carbide. Metallurgical coal contrasts with thermal coal, and has different sources (produced mainly in Canada, the United States, and Australia) and industrial significance; prices for the two may vary.

The suitability for conversion to coke is also referred to as the caking ability. Metallurgical coal is harder, blacker, produces less ash when burned, and contains less moisture.

Metallurgical coal may be further divided into categories:-

...
Wikipedia