Compared with the coke fired furnace and concern over climate changes due to the emissions, the gas fired cupola wins hands down.

It requires around half of the base energy to melt a given tonne of iron and can operate without any visible emission even when using dirty materials.

There are significant reductions in the amount of emissions of sulphur and nitric oxides and no sulphur absorption makes the furnace ideal for the production of ductile or nodular iron.

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