Question

extraction of iron aluminum and copper​

Answer 1

Explanation:

Resources

Extraction of Copper

The chief and important ore of copper from which the metal is most isolated is copper pyrites (CuFeS2). Froth floatation process is used for concentrating the ore. The powdered ore is suspended in water and after adding little pine oil is stirred by means of air. The sulphide ore particles come to the surface & gangue remains at the bottom is rejected.

1. Ores of Copper

Name of Ore

Formula of Ore

Copper glance or Chalcocite:

Cu2S

Chalcopyrites(copper pyrites):

Cu2S×Fe2S3

Cuprite

Cu2O

Malachite

[CuCO3.Cu(OH)2]

Azurite

[2CuCO3.Cu(OH)2]

2. Extraction of Metallic Copper

Concentration of the ore by froth floatation process:

Copper pyrites contains only (2-3)% of copper. The rest of the ore contains iron or sulphide, silica, silicious materials, sulphur, arsenic etc. as impurities. Froth flotation by Xanthate and pine oil. The froth is collected and dried when concentrated ore is obtained which contains 25-30% of Cu.

Roasting

Cu2S.Fe2S3 + O2 → Cu2S + 2FeS + SO2­

Cu2S.Fe2S3 + 4O2 → Cu2S + 2FeO + 3SO2­

2Cu­2S + 3O2 → 2Cu2O + 2SO2­

Cu2O + FeS → Cu2S + FeO

Smelting of the roasted ore in blast furnace: material required

Roasted ore

Lime stone

Coke (used as fuel)

Silica (used as flux)

Lime stone (used to remove excess silica)

Reactions occurring given as follows

2FeS + 3O2 → 2FeO + 2SO2­

Cu2O + FeS → Cu2S + FeO