Building Materials
During smelting process, the combination of fuel in the furnace

Carbon dioxide with carbon forms carbon mono-oxide
All listed here
Carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2
Forms carbon dioxide

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Building Materials
Asbestos

Is a natural fibrous mineral substance
Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
All of these
Contains iron oxide and alumina

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