Question

During the extraction of $Fe$ the slag obtained is_______.
(A) $FeSi{{O}_{3}}$
(B) $FeO$
(C) $CaSi{{O}_{3}}$
(D) $MgSi{{O}_{3}}$

Answer 1

Hint: When a metal is separated from its ore, the product left behind is called slag. It is actually the impurities. This process is smelting. The slag thus formed is a mixture of metal oxide and silicon dioxide. It occurs as a molten liquid. After cooling, the slag solidifies. Slag contains a high amount of iron. This is the reason why slag gets stuck to the magnet. Flux is of two types: Acidic flux and basic flux. The acidic flux combines with basic impurity, and the basic flux combines with acidic impurity to form slag.

Complete Step by Step Answer:
The extraction of $Fe$is done by the process of calcination. The process of calcination involves heating the metal's ore to a high temperature without any exposure to air or oxygen. When $CaC{{O}_{3}}$ is introduced to a blast furnace during the metallurgy process of iron, calcium ions emerge as slag. The calcium oxide combines with silicon dioxide to form calcium silicate, also known as slag.

Correct Option: (C) $CaSi{{O}_{3}}$.

Additional Information: Slag prevents the metal from coming into contact with the air, preventing oxidation. It is insoluble in molten metal because it floats on the surface of the metal. The slag can be used to build roads, make cement, or create plant fertiliser.

Note: In some conditions, the metal extracted from the ore is not more valuable than the slag. Example: Ilmenite is a titanium-iron oxide mineral from which titanium oxide is prepared.