Fuels and Combustion
Which of the following would require least amount of secondary air for combustion?

Coke breeze containing 25% ash and 2% volatile matter
Anthracite containing 10% volatile matter and 8% ash
Bituminous coal containing 20% ash and 25% volatile matter
Semi-bituminous coal containing 25% ash and 20% volatile matter

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Fuels and Combustion
Anthracite can be used for

Recarbonising steel
Blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke
All of these
Making carbon electrodes

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