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The solubility of calcium carbonate in green liquor handling systems, TAPPI Journal October 2019

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.

Conference papers
Biodegradable Paper-based Coffee Cups: Current Progress and Outlook, 19Papercon

Biodegradable Paper-based Coffee Cups: Current Progress and Outlook, 19Papercon

Conference papers
PROMINENT ENERGY AND PERFORMANCE IMPROVEMENTS FROM SOFTWARE FOR AC INDUCTION MOTOR DRIVES, 19TissueCon

PROMINENT ENERGY AND PERFORMANCE IMPROVEMENTS FROM SOFTWARE FOR AC INDUCTION MOTOR DRIVES, 19TissueCon

Conference papers
AI-Driven Machine Health and Performance, 19TissueCon

AI-Driven Machine Health and Performance, 19TissueCon

Conference papers
Increased Productivity with Sustainable Non-DestructiveDry Ice Cleaning, 19TissueCon

Increased Productivity with Sustainable Non-DestructiveDry Ice Cleaning, 19TissueCon

Conference papers
HYDRAGEN TM TECHNOLOGY, 19TissueCon

HYDRAGEN TM TECHNOLOGY, 19TissueCon

Conference papers
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DEVELOPING INNOVATIVE TOOLS TO ENHANCE QUALITY CONTROL, MILL PROCESSES AND ACCELERATE NEW PRODUCT DEVELOPMENT, 19TissueCon

Conference papers
Drive Cost Savings through Insulation and Enhanced Maintenance Practices to Energy Efficiency, 19TissueCon

Drive Cost Savings through Insulation and Enhanced Maintenance Practices to Energy Efficiency, 19TissueCon

Conference papers
New Age Vacuum System Concepts for Tissue Machines, 19TissueCon

New Age Vacuum System Concepts for Tissue Machines, 19TissueCon

Conference papers
State of the Art Wastewater Lagoon AerationBetter Treatment, Lower Costs, 19TissueCon

State of the Art Wastewater Lagoon AerationBetter Treatment, Lower Costs, 19TissueCon

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