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Gypsum Scale Formation in White Water of a Closed‐Cycled Paper Mill
Author(s) -
Choi SangJune,
Kim HaeYoung,
Kim YoungHun,
Park Hyeon,
Englezos Peter
Publication year - 2003
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450810521
Subject(s) - gypsum , papermaking , precipitation , sulfate , calcium , scale (ratio) , mineralogy , environmental science , chemistry , chemical engineering , pulp and paper industry , materials science , meteorology , engineering , metallurgy , geography , cartography
The accumulation of calcium and sulfate ions in a process stream of a closed papermaking system may cause calcium sulfate scale formation. This study presents measurements of calcium sulfate precipitation conditions and a thermodynamics‐based model for the prediction of such precipitation conditions in the papermaking white water at 50°C. The precipitates were found to have the structure of gypsum (CaSO 4 ·2H 2 O). The model calculations were compared with experimental data and found to be in good agreement.