Coking Coal or Metallurgical coal
Coking Coal or Metallurgical coal is used in manufacturing steel, where carbon must be as volatile-free and ash-free as possible. Coking coal is also heated to produce coke, a hard porous material which is used to blast in furnaces for the extraction of iron from the iron ore.
Non Coking Coal
Non Coking Coal does not have any caking properties and it is mainly used as thermal coal for power generation. It has a higher ash content and also used in industries like cement, fertilizer, glass, ceramic, paper, chemical and brick manufacturing. Indian Non Coking Coal is classified on the basis of Gross Calorific Value (GCV) which consists of 17 GCV bands.
Anthracite Coal is a hard, compact variety of mineral coal that has a high luster. Anthracite ignites with difficulty and burns with a short, blue, and smokeless flame. It has the highest carbon count, the fewest impurities, and the highest calorific content of all types of coals, which also include bituminous coal and lignite. It is mostly used for chemical and metallurgical purposes. Crushed anthracite makes an excellent medium density filtration media and is also used for water filtration process.
Jhama Coal is characterized by high ash, low volatile matter and high fixed carbon. Jhama is usually dull, compact and hard in nature. In India, a large amount of Jhama Coal has been found in the Damodar Valley Coalfields. Jhama is widely used in Lime Manufacturing, Ferro Alloys and Brick Manufacturing units.
Lignite Coal also referred to as brown coal, is a soft brown fuel and is considered the lowest rank of coal. It has characteristics that put it somewhere between coal and peat. Its carbon content varies from 40-55 % and it contains about 25-35% of moisture. The calorific value of lignite ranges between 6000-7000 B.Th.U (3300-3900 K.Cal/kg). Lignite is mainly used in power generation, and Brick Manufacturing units.
Metallurgical Coke is used as a fuel and as a reducing agent in smelting iron ore in a blast furnace where a uniform and high temperature is required. It is widely used at integrated plants as well as secondary steel / Pig Iron (Mini Blast Furnaces), Foundries, and Zinc & Copper Smelting.
Breeze Coke or Coke Fines
Breeze Coke or Coke Fines refers to the fine sizes of coke, usually less than 10mm. It is generated after screening operation where pieces and dust too small for steel making are removed. Coke breeze is either reused on site (e.g. in the sinter plant) or disposed as a by-product. The 0-3 mm is the most favourable particle size for coke breeze in the sintering process. It is used in Cement Industry, Refractories & Sintering Operations