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Chem Chemistry

ChemistryNEB 2074 (old course)

What is meant by Slag? Write an example of it.

2

Answer

· Based on the official syllabus and past papers
Updated
CaCO₃+SiO₂High temperature (extraction furnace)CaSiO₃+CO₂
Formation of slag (CaSiO₃) during iron extraction from limestone (CaCO₃) and silica (SiO₂) impurities. The reaction occurs in a blast furnace at ~1500°C.

Slag is a non-metallic, glassy, or rocky by-product formed during the extraction of metals (especially iron and steel) from their ores. It consists primarily of metal oxides and silicates, which are less dense than the molten metal and float on top. Slag is formed when flux (e.g., limestone, CaCO₃) reacts with impurities like silica (SiO₂) in the ore at high temperatures, producing a fusible slag that can be easily separated from the purified metal.

Example of slag: When limestone (CaCO₃) is added as a flux in a blast furnace to remove silica (SiO₂) impurities, calcium silicate (CaSiO₃) is formed as slag:

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