CBSE Class 10 Answered
An ore on heating in air produces sulphur dioxide gas.which process would you suggest for its concentration?describe briefly any 2 steps invoved in the convertion of disconcentrated ore into related metal.
Asked by | 16 Aug, 2012, 07:23: PM
Expert Answer
The roasting of sulfide ores such as pyrite, sphalerite, and cinnabar (mercury sulfide) releases SO2:
Large amount of copper are obtained from copper pyrite (CuFeS2) by smelting. Ores containing 4% or more copper are treated by smelting process. Very poor ores are treated by hydro-metallurgical process. The two steps invoved in the convertion of disconcentrated ore into related metal:
Smelting : The roasted ore is mixed with coke and silica (sand) SiO2 and is introduced in to a blast furnace. The hot air is blasted and FeO is converted in to ferrous silicate (FeSiO3). | |
FeO + SiO2 è FeSiO3
Cu2O + FeS è Cu2S + FeO |
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FeSiO3 (slag) floats over the molten matte of copper. |
BESSEMERIZATION Copper metal is extracted from molten matte through bessemerization . The matte is introduced in to Bessemer converter which uphold by tuyers. The air is blown through the molten matte. Blast of air converts Cu2S partly into Cu2O which reacts with remaining Cu2S to give molten copper.
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2Cu2S + 3O2 è 2Cu2O + 2SO2
2Cu2O + Cu2Sè 6Cu + SO2 |
Answered by | 17 Aug, 2012, 06:31: PM
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