Fuels and Combustion
Coke oven gas is stripped of its H₂S and mercaptans content by

Adsorption on silica gel
Adsorption on bog iron bed
Bubbling it through dilute sulphuric acid
Absorption in wash oil

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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
All of these
It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber
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

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