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extraction of copper from cuprous oxide

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extraction of copper from cuprous oxide

Posted by Nikhil Chauhan 6 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 3 months ago

Considering the Graph (1) the Cu₂O line is at the top.
So to reduce oxide ores of copper directly to the metal by heating with coke (both the lines of C, CO and C, CO₂ are at much lower positions in the graph particularly after 500 – 600K).
Most of the ores are sulphide and some may also contain iron. The sulphide ores
are roasted/smelted to give oxides:
2Cu₂S + 3O2 → 2Cu₂O + 2SO₂
- The oxide can then be easily reduced to metallic copper using coke:
- Cu₂O + C → 2 Cu + CO
In actual process, the ore is heated in a reverberatory furnace after mixing with silica. In the furnace, iron oxide ‘slags of’ as iron silicate and copper is produced in the form of copper matte. This contains Cu₂S and FeS.
- FeO + SiO₂ → FeSiO₃ (Slag)
Copper matte is then charged into silica lined convertor.
Some silica is also added and hot air blast is blown to convert the remaining
- FeS₂, FeO and Cu₂S/Cu₂O to the metallic copper.
  - Following reactions take place:
    - 2FeS + 3O₂ → 2FeO + 2SO₂
    - FeO + SiO₂ → FeSiO₃ (6.38)
    - 2Cu₂S + 3O₂ → 2Cu₂O + 2SO₂
    - 2Cu₂O + Cu₂S → 6Cu + SO₂
  - The solidified copper obtained has blistered appearance due to the evolution of SO₂ and so it is called blister copper.

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