Science and Technology news... :: View topic - reactions for the stack process for producing lead white

hechnal · Guest

Hey,

Does anyone know, or could possibly work out, the chemical reactions
which occur in the production of the pigment lead white
((PbCO3)2.Pb(OH)2)?

The basic process is:

A specially constructed chamber contained rows of earthenware pots
filled with acetic acid. These were surrounded by a fermenting
substance that would not only release the necessary heat to forward
the reaction but also produce carbon dioxide. Such substances were
commonly manure. Lead sheets were placed above the pots and wooden
floorboards were laid over them. The chamber was then left for 3-4
months. The lead is converted, with the action of air, acetic acid and
carbon dioxide via lead hydrate to lead acetate, lead acetate
hydroxide to lead carbonate hydroxide. On opening, the lead white
accumulated on the lead sheets was scraped off, washed and dried.

Thank you,

Michael


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