Since the products of flue gases directly contact the stock, type of fuel chosen is of
importance. For example, some materials will not tolerate sulphur in the fuel. Also use of
solid fuels will generate particulate matter, which will interfere the stock place inside the
furnace. Hence, vast majority of the furnaces use liquid fuel, gaseous fuel or electricity
as energy input.
Melting furnaces for steel, cast iron use electricity in induction and arc furnaces.
Non-ferrous melting utilizes oil as fuel.
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