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Manipal Entrance Test 2013 Chemistry Paper
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© examsnet.com
Question : 8
Total: 60
The final step for the extraction of copper form copper pyrites in Bessemer convertor involves the reaction.
Cu
2
S
+
2
FeO
–
–
–
–
–
▸
2
Cu
+
2
Fe
+
SO
2
Cu
2
S
+
2
CuO
+
–
–
–
–
–
▸
6
Cu
+
SO
2
4
Cu
2
S
+
FeS
–
–
–
–
–
▸
8
Cu
+
2
Fe
SO
2
2
Cu
2
S
+
FeS
–
–
–
–
–
▸
4
Cu
+
Fe
+
SO
2
Validate
Solution:
Ore- copper pyrites . CuFeS
2
Concentrated pyrites ore (froth- floatation process) is roasted below 800°C FeS is converted to FeO while copper remains as sulphide
Roasting
2
FeS
+
3
O
2
Δ
–
–
–
–
–
🢖
2
FeO
+
2
SO
2
↑
Smelting
FeO
+
SiO
2
–
–
–
–
–
🢖
FeSIO
3
slag
(
SiO
2
either is present ore or is added)
Bessemerisation
2
Cu
2
S
+
3
O
2
→
2
Cu
2
O
+
2
SO
2
Cu
2
S
+
2
CuO
+
–
–
–
–
–
🢖
6
Cu
+
SO
2
(final step)
© examsnet.com
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