Question

extraction of copper from copper pyrite

Answer 1

The concentrated ore is heated in excess supply of air on the hearth of reberberatory furnace below its melting point. The different changes during roasting are:

a. Moisture and volatile impurities are driven out.

b. Non-metallic impurities like sulphur, phosphorous, arsenic etc. are removed as their oxides.

S + O2      →             SO2

P4 + SO2        →       2P2O5

c. Copper pyrite dissociates into individual sulphide

2CuFeS2 + O2    →         Cu2S + 2FeS + SO2     major r × n

Small amount of metal sulphides are oxidized to oxides.

2FeS + 3O2     →       2FeO   + SO2             minor reaction

2Cu2S + 3O2   →       2CuO  + 2SO

Answer 2

see .. copper pyrite Isa ore which formula is cufes2 ...

hence there is impurities of sulfer .

1 so forth floating method or .. magnetic separation method will be used in constration of ore .. so .. see ..

2 now ..it is time of . oxidation .. at here we use . roasting .. for removing .. sulfer from the ore. ..
3. now it's time of reduction .. cu is a reducing agent .. it can reduce it self thatethode is called self reducing process .. in here .
cu2s +O2= cu2o
cu2o +cu2s = cu+ so2 ....

4 now it's time of refining. . some method of refining is following ....
poling method.
electrolytic separation .

last thing. see u have nothing there is Fe. but didn't used to come without. a. in fussable. impurites of si2o3. (silica). so .. we will used .. here a basic flux. because silica is acidic ..
for making it fussable ....


first time it a bda and Diya ..but essa lg ..ours lesson revise hua thx sir for asking ....

name hp