Fuels and Combustion
Fussain

Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal
Is friable, charcoal like substance
Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation
All of these

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Fuels and Combustion
A coal with high ash content is undesirable, as

The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes
The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the
All of these
It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber

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