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Write the chemical equations involved in the extraction of lead from galena by self-reduction process.

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Lead is mainly extracted from sulphide ore called galena. Roasting is done followed by reduction with carbon. Self-reduction finally takes place.
`2PbS + 3O_(2) rarr 2PbO + SO_(2)`
`PbS + 2O_(2) rarr PbSO_(4)`
`PbSO_(4) + PbO rarr 2Pb + 2SO_(2)`
`PbS + 2PbO rarr 3Pb + SO_(2)`.
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Write the chemical equations involved in the extraction of lead from galena by self-reduction process.

Main ore of lead is galena.This is mined and separated from other minerals by froth flotation.There are two methods of extracting the lead.
(i)First method involves the roasting of ore followed by reduction
with coke or CO.
(ii)Second method involves the partial roasting of ore followed by
self reduction.
Partial roasting of galena gives :

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