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There are many production processes for common red iron oxide pigments, generally dry and wet. Among them, green alum calcination is a common one, is also the most used one. What aspects should be paid attention to when manufacturing and processing with this method:
The reaction mechanism of the green alum calcination method is to use the heating method to decompose the green alum, and use the oxygen of the air to oxidize the green alum. For the smooth progress of the reaction, dehydration treatment is performed first, otherwise ferrous sulfate will dissolve in its own crystal water during high temperature calcination. Moisture evaporates rapidly through high temperature ,It will cause the ferric sulfate to agglomerate after melting, and finally cause the product to agglomerate and not be in a powder state.
To be continued...
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