Discussion
Many plastic components are used as ........ for blast furnaces.
Answer: A
Plastics are used as reducing agents for blast furnaces.
A blast furnace reduces iron ore (iron oxides) to iron using carbon and hydrogen from coke. Waste plastics are hydrocarbons, so when injected into the furnace they break down into carbon monoxide and hydrogen, which reduce the ore. Steelmakers in Japan and Germany have used waste plastic injection to replace part of the coke or pulverised coal.
A blast furnace needs reduction, not oxidation, so plastics cannot act as oxidising agents. 'Protecting agents' and 'infectious agents' have no role in the process; the last is a biological term.
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