Extraction of Metals - Result Question 93

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

(1979,2M)

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Solution:

  1. In the first step, galena is heated in presence of O2 (limited quantity) in a reverberatory furnace, where PbS is partially oxidised to PbO :

PbS+32O2PbO+SO2

In the second step, more PbS is added and heated in absence of O2, where the following self reduction takes place

PbS+2PbO3Pb+SO2



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