The solubility of calcium carbonate in green liquor handling systems
| Autor: | Honghi Tran, Vladimiros G. Papangelakis, Alisha Giglio |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
040101 forestry
Mechanical Engineering General Chemical Engineering food and beverages 04 agricultural and veterinary sciences 02 engineering and technology General Chemistry equipment and supplies chemistry.chemical_compound Calcium carbonate 020401 chemical engineering chemistry Chemical engineering Media Technology 0401 agriculture forestry and fisheries Green liquor General Materials Science 0204 chemical engineering Solubility |
| Zdroj: | TAPPI Journal. 18:595-602 |
| ISSN: | 0734-1415 |
| DOI: | 10.32964/tj18.10.595 |
| Popis: | The formation of hard calcite (CaCO3) scale in green liquor handling systems is a persistent problem in many kraft pulp mills. CaCO3 precipitates when its concentration in the green liquor exceeds its solubility. While the solubility of CaCO3 in water is well known, it is not so in the highly alkaline green liquor environment. A systematic study was conducted to determine the solubility of CaCO3 in green liquor as a function of temperature, total titratable alkali (TTA), causticity, and sulfidity. The results show that the solubility increases with increased temperature, increased TTA, decreased causticity, and decreased sulfidity. The new solubility data was incorporated into OLI (a thermodynamic simulation program for aqueous salt systems) to generate a series of CaCO3 solubility curves for various green liquor conditions. The results help explain how calcite scale forms in green liquor handling systems. |
| Databáze: | OpenAIRE |
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