A coal with high ash content is undesirable, as________________?

• A. It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber
• B. 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 o
• C. The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besi
• D. All A., B. and C.