Calcium Oxide Is Added to Molten Iron in the Production

question 12

Multiple Choice

Calcium oxide is added to molten iron in the production of carbon steel in order to

• A)convert silicon and phosphorus oxides to slag which can be decanted from the molten steel.
• B)serve as a scrubber to remove sulfur dioxide from the gases leaving the furnace.
• C)remove any traces of acid which could weaken the steel.
• D)add a small amount of oxygen to the steel to prevent corrosion and increase its strength.
• E)create gangue.

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