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The substance that is used in the steel industry for the removal of carbon…

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The substance that is used in the steel industry for the removal of carbon, Sulphur and phosphorus impurities from pig iron is

A. oxygen

B. chlorine

C. nitrogen

D. hydrogen

QUICK ANSWER…

A

DETAILS…

Oxygen is often blown into the blast furnace during the purification of pig iron to oxidize and slag out phosphorus, sulphur, carbon and silicon impurities. Carbon is oxidized to carbon monoxide, while phosphorus, sulphur, and silicon are oxidized to their respective acidic oxides.

Now for the right answer to the above question:

  1. Option A is correct. Oxygen is usually blown into the furnace to oxidize out the impurities.
  2. Option B is incorrect. chlorine is incorrect.
  3. C is incorrect. Nitrogen, not needed here.
  4. D is not the correct answer. Hydrogen may be able to remove phosphorus as phosphine, but it is not known to be in use.

KEY-POINTS…

You may please note these/this:

  • Hot air is actually what is blown into the furnace, the oxygen component and not nitrogen component in air, is what reacts with impurities to oxidize them out of the molten pig iron.

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/ culled from 2015 JAMB-UTME Chemistry past question 31 /

The substance that is used in the steel industry for the removal of carbon... » QuizTablet
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