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Chemical Engineering Basics

Q1: Which of the following if present in iron ore, enhances its value ?

A Alumina

B Alkali oxide

C Lime & Magnesia

D None of these

ANS:C - Lime & Magnesia

Among the options provided, lime and magnesia enhance the value of iron ore. These compounds serve as fluxes during the smelting process of iron ore into iron and steel. Here's why:

  1. Lime (calcium oxide) and magnesia (magnesium oxide): These compounds act as fluxes in the blast furnace process. Fluxes help to remove impurities such as silica, alumina, and other acidic oxides from the iron ore, forming a molten slag. This slag floats on top of the molten iron and can be easily separated, thereby improving the purity of the iron produced.
Alumina and alkali oxides, on the other hand, can be considered impurities in iron ore, and their presence might require additional processing steps to remove them, which can increase production costs. Therefore, they do not enhance the value of iron ore.



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