Question

if an ore contains SiO2 as gangue parties.then suggest suitable flux to remove that gangue particles

Answer 1

CaCO3 would work well in blast furnace

Answer 2

Answer:

Calcium oxide is used to remove Silica $\left(\mathrm{SiO}_{2}\right)$ as gangue in an ore.  

$\mathrm{CaO}(\mathrm{Flux})+\mathrm{SiO}_{2}(\text { Gangue }) \rightarrow \mathrm{CaSiO}_{2}(\mathrm{Slag})$

Explanation:

• Flux is a chemical substance added to the impure ore to remove the impurities in the form of gangues.
• It can be a basic or acidic flux. Acidic flux is an oxide of a non-metal or an acidic oxide like $\mathrm{SiO}_{2}, \mathrm{B}_2 \mathrm{O}_{3}$ that are added to ores to remove basic gangues like CaO, MgO etc.
• A basic flux is an oxide of a metal or a basic oxide like CaO, MgO etc.
• It is used to remove the basic gangues like $\mathrm{SiO}_{2}, \mathrm{B}_2 \mathrm{O}_{3}$ etc from the ores.
• When flux is added to the impure ore, it combines with the gangue and forms a fusible mass called slag.
• This slag is later removed through various methods to purify the metal from the ore.