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Grade: 12
        
 use of SiO2 in the extraction of copper from copper matte. 
3 years ago

Answers : (3)

Avinash
askIITians Faculty
1246 Points
							Silica (SiO2) is used in the processes of smelting of copper pyrite (CuFeS2) ore and in conversion of produced copper matte (refined copper sulfide) into a crude metal as a flux (purifying agent). It reacts with solid impurities, such as iron oxide, and forms a liquid slag with density, smaller than the copper matte. Though, the slag can be easily separated from the desired product. Smelting is an exothermic reaction between copper pyrite ore, oxygen of air and fluxes (such as silica and limestone) at 1200 °C (above the melting point of copper, but below that of the iron and silica) to form a liquid called "copper matte". The high temperature allows reactions to proceed rapidly, and allow the matte and slag to melt, so they can be "tapped out" of the furnace. In the smelting process such chemical reactions are taking place: 1) oxidizing of the copper pyrite:
2 CuFeS2 (s) + 3 O2 (g) → 2 FeO (s) + 2 CuS (l) + 2 SO2 (g)
2) conversion of iron oxides and sulfides into molten slag:
FeO (s) + SiO2 (s) → FeSiO3 (l)
2 FeS (s) + 3 O2 (g) + 2 SiO2 (s) → 2 FeSiO3 (l) + 2 SO2 (g)
The matte, which is produced in the smelter, contains around 70% copper primarily as copper sulfide as well as iron sulfide. The sulfur is removed at high temperature as sulfur dioxide by blowing air through molten matte. The iron sulfide is also converted into molten slag (reaction is shown above).
3 years ago
grenade
2056 Points
							
SiO2 in the extraction of copper from copper matte: Copper matte consists of Cu2S and FeS. In the converter FeS is converted to FeO. Silica helps in removal of FeO impurity as slag.
3 years ago
mohit vashishtha
144 Points
							
SiO2 acts as an basic flux which is used in slag formation(FeO). 
which is removed then as an impurity
3 years ago
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