Question

In steelmaking, slag primarily functions to:

• A. Improve thermal conductivity
• B. Remove impurities
• C. Add carbon
• D. Increase viscosity

Hint:

In metallurgy, think of slag as a "scavenger"—its job is to trap impurities and clean the metal during smelting or refining.

Answer 1

The Correct Option is B

In the steelmaking process, slag is a by-product formed from the reaction between fluxes (like limestone) and impurities present in the raw materials, such as silica, alumina, and other non-metallic oxides.
Its primary role is to remove impurities from the molten metal. Slag captures and separates these unwanted elements, preventing them from remaining in the final steel product.
While slag may have some minor effects on heat retention or fluid properties, its main function is purification of the metal. It does not improve conductivity, add carbon, or increase viscosity intentionally.