Flue Gas:
The gas leaving the furnace is known as flue gas. It contains
nitrogen,
carbon monoxide, carbon dioxide and fine solid particles including carbon
particles. The emission of flue gas into the atmosphere tends to damage the
environment and is a source of environmental pollution.
Pig Iron:
The molten metal obtained from the blast furnace is run into
sand moulds where it cools down to solid blocks called pig iron, because its
ingots on solidification look like pigs. Pig iron is about 96% iron (Fe),
and 4% carbon (c) with small amounts of other impurities such as silicon,
sulphur, phosphorus and manganese.
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