PUC Karnataka Science Class 12Department of Pre-University Education, Karnataka
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State the Role of Silica in the Metallurgy of Copper. - PUC Karnataka Science Class 12 - Chemistry

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Question

State the role of silica in the metallurgy of copper.

Solution 1

During the roasting of pyrite ore, a mixture of FeO and Cu2O is obtained.

The role of silica in the metallurgy of copper is to remove the iron oxide obtained during the process of roasting as ‘slag’. If the sulphide ore of copper contains iron, then silica (SiO2) is added as flux before roasting. Then, FeO combines with silica to form iron silicate, FeSiO3 (slag).

Solution 2

During roasting, copper pyrites are converted into a mixture of FeO and Cu20. Thus, acidic flux silica is added during smelting to remove FeO (basic). FeO combines with SiO2to form famous silicate (FeSiO3) slag which floats over molten matte.

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APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 12 (2015 to Current)
Chapter 6: General Principles and Processes of Isolation of Elements
Q: 9 | Page no. 163
Solution State the Role of Silica in the Metallurgy of Copper. Concept: Application of Thermodynamic Principles of Metallurgy.
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