Complete the following sentence: In the conversion of iron to steel, ______ ; Your answer here;oxide is used to neutralise acidic impurities.
Question
Complete the following sentence: In the conversion of iron to steel, ______ ; Your answer here;oxide is used to neutralise acidic impurities.
Solution
In the conversion of iron to steel, limestone or calcium carbonate is added; this compound reacts with the impurities in the iron such as silicon, phosphorus, and sulfur, forming slag. This slag is lighter than the molten iron and so it floats on top, allowing for easy removal. The remaining iron is then converted into steel. Therefore, the complete sentence is: "In the conversion of iron to steel, limestone or calcium carbonate is added; this oxide is used to neutralise acidic impurities."
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