Coal Types and Specifications

RB1, RB2, RB3: RB1, RB2, and RB3 are used to classify thermal coal based on quality. These grades are often used for trading purposes.

Specifications
Calorific Value Basis (kcal/kg NCV)	6,000
Calorific Value Min (kcal/kg NCV)	5,850
Total Moisture (ARB)	12.0% Max
Volatile Matter (ARB)	22.0% Min
Ash (ARB)	15.0% Max
Sulphur (ARB)	1.0% Max
Hardgrove Grindability Index (HGI)	45 – 70
Nominal Topsize	50 mm
IDT	Min 1,250 °C in a reducing atmosphere
Calcium Oxide in Ash (DB)	12.0% Max

Specifications
Calorific Value Basis (kcal/kg NCV)	6,000
Calorific Value Min (kcal/kg NCV)	5,700
Total Moisture (ARB)	13.0% Max
Volatile Matter (ARB)	21.0% Min
Ash (ARB)	17.0% Max
Sulphur (ARB)	1.0% Max
Hardgrove Grindability Index (HGI)	45 – 70
Nominal Topsize	50 mm
IDT	Min 1,250 °C in a reducing atmosphere

Specifications
Calorific Value Basis (kcal/kg NCV)	5,500
Calorific Value Min (kcal/kg NCV)	5,300
Total Moisture (ARB)	14.0% Max
Volatile Matter (ARB)	20.0% Min
Ash (ARB)	23.0% Max
Sulphur (ARB)	1.0% Max
Hardgrove Grindability Index (HGI)	45 – 70
Nominal Topsize	50 mm
IDT	Min 1,150 °C in a reducing atmosphere

Specifications
Calorific Value Basis (kcal/kg NCV)	4,800
Calorific Value Min (kcal/kg NCV)	4,500
Total Moisture (ARB)	14.0% Max
Volatile Matter (ARB)	18.0% Min
Ash (ARB)	32.0% Max
Sulphur (ARB)	1.2% Max
Hardgrove Grindability Index (HGI)	45 – 70
Nominal Topsize	50 mm
IDT	Min 1,150 °C in a reducing atmosphere

Anthracite is a high-rank coal with unique characteristics:

It has the highest carbon content among all coal types, typically over 90%, which makes it a very energy-dense fuel.
Anthracite has low volatile matter and produces minimal smoke or emissions when burned, making it a clean-burning fuel.
It has a high ignition temperature and burns at a steady, consistent rate, making it ideal for residential heating and industrial applications.
Due to its low ash content and high energy output, anthracite is used in home heating stoves, furnaces, and in some industrial processes.

Coking coal, also known as metallurgical coal, is crucial for steel production

It has specific properties that make it suitable for the production of coke, which is used in the steelmaking process.
Coking coal has low sulfur and phosphorus content, as impurities can negatively affect the quality of steel.
It must have a high coking ability, meaning it can form a strong and porous coke when heated in a coke oven.
The resulting coke is used in blast furnaces to reduce iron ore to molten iron, a key step in steel production.

Volatile Matter (VM)	Approximately 20-32%
Fixed Carbon (FC)	Approximately 63-82%
Ash Content	Typically less than 9%
Sulfur Content	Ideally below 1%
Phosphorus Content	Generally below 0.02%
Crucible Swelling Number (CSN):	Typically 7 or higher
Fluidity	Usually in the range of 200-400 ddpm (decigrams per minute)

Coal Grades	Size (mm)	Total Moisture (%)	Ash Content (%)	Volatile Matter (%)	Total Sulphur (%)	Net Calorific Value (Kcal/kg)
Steam High CV Coal	0-50	9.0-10.0	10.0-11.0	31.0-35.0	0.25-0.35	6200-6300
Steam High Volatile Coal	0-50	9.0-10.0	10.0-11.0	31.0-35.0	0.25-0.35	5900-6150
Steam High Volatile Low CV Coal	0-50	14.0-16.0	7.0-9.0	31.0-35.0	0.40-0.50	5400-5500
Steam Mid Volatile SS-coal	0-50	9.0-10.0	10.5-16.0	18.0-19.0	0.25-0.30	6000-6500
Steam Low Volatile T-coal	0-50	7.0-8.0	10.0-15.5	9.0-11.0	0.25-0.40	6200-6400
PCI Washed SS-coal	0-50	7.0-8.0	5.0-6.0	18.0-19.0	0.20-0.30	6900-7200
PCI Washed T-coal	0-50	6.0-7.0	7.5-9.0	9.0-11.0	0.20-0.30	6800-7200
PCI High Volatile Coal	0-50	7.0-8.0	8.0-9.0	32.0-34.0	0.40-0.50	6600-6800
PCI T-coal ash 12%	0-50	9.0-10.0	10.0-12.0	9.0-11.0	0.30-0.40	6600-6900
Sized High Volatile	50-200	5.5-7.0	4.0-7.5	18.0-20.0	0.25-0.30	7000-7300