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Chemical and Process Engineering Resources

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Category: Reactions and Processes
Question: How is precipitated calcium carbonate manufactured and what is it used for?
Keywords: v1i16,pcc,precipitated,calcium,carbonate,manufacture,uses
Answer: Precipitated calcium carbonate (PCC) is manufactured by the following reactions:CaCO3 (limestone) --> CaO + CO2 (calcination at 900C)CaO + H2O --> Ca(OH)2 (slaking)Ca(OH)2 + CO2 --> CaCO3 (PCC) + H2O (precipitation)Following these reactions a 40-60% by weight cake results. The cake is filtered, dried, and ground to fine particles. (See image below)PCC is used for papermaking as a filler or coating. In recent years it has successfully stolen much of this market from Titanium Dioxide which is more costly (though there are still applications where Titanium Dioxide is necessary). The trend in the PCC industry is to build satellite plants beside paper mills. This allows the PCC to be fed to the paper mill via a slurry line. Once inside the plant, the slurry can be dried (or spray dried) and applied instantly to the paper.Reference: Solvay Minerals and Mineral Technologies
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