On 31/03/2013 16:20, The Natural Philosopher wrote:
"Galena, the most common mineral of lead, is primarily lead sulfide
(PbS). The sulfide is oxidized to a sulfite (PbSO3) which thermally
decomposes into lead oxide and sulfur dioxide gas. (PbO and SO2) The
sulfur dioxide (like the carbon dioxide in the example above) is
expelled, and the lead oxide is reduced. Anglesite, Cerussite,
Pyromorphite, Mimetite and Wulfenite are other lead ores.

And they shut down Didcot because it was producing too much sulphur?

Andy