The solubility of calcium carbonate in green liquor handling systems-Reference-Cited by-同舟云学术

The solubility of calcium carbonate in green liquor handling systems

Published:2019-11-01 Issue:10 Volume:18 Page:595-602
ISSN:0734-1415
Container-title:TAPPI Journal
language:en
Short-container-title:TJ

Author:

GIGLIO ALISHA,PAPANGELAKIS VLADIMIROS G.,TRAN HONGHI

Abstract

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.

Publisher

TAPPI

Subject

Mechanical Engineering,General Materials Science,Media Technology,General Chemical Engineering,General Chemistry

Reference11 articles.

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