Aluminium is added in Bessemer process to remove certain impurities, but not in \(\mathrm{L}-\mathrm{D}\) process. This is because (a) pure oxygen is passed in Bessemer process (b) pure oxygen is passed in \(\mathrm{L}-\mathrm{D}\) process (c) air is passed in \(L-D\) process (d) of addition of spiegel in Bessemer process

Short Answer

Expert verified
Answer: Pure oxygen is passed in the L-D process.

Step by step solution

01

Option (a): Pure oxygen is passed in Bessemer process

Actually, the Bessemer process involves blowing air, not pure oxygen, through molten iron to remove impurities. Therefore, option (a) is incorrect.
02

Option (b): Pure oxygen is passed in L-D process

The L-D (Linz-Donawitz) process, also known as the basic oxygen steelmaking process, uses pure oxygen instead of air to remove impurities from molten iron. The use of pure oxygen reduces the need for aluminium as a deoxidizer for the molten iron. Therefore, option (b) is the correct answer.
03

Option (c): Air is passed in L-D process

This statement is incorrect. In the L-D process, pure oxygen is used, not air. Hence, option (c) is not correct.
04

Option (d): Addition of spiegel in Bessemer process

Spiegeleisen, or spiegel, is an alloy of iron, manganese, and carbon, used as a deoxidizer in the production of steel. It is added in some steelmaking processes but its addition is not the reason why aluminium is used in the Bessemer process. Therefore, option (d) is not the correct answer. After analyzing all given options, the correct answer is (b) pure oxygen is passed in L-D process.

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