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Mill experience of calcium carbonate scale formation in green liquor pipelines, TAPPI Journal August 2020
ABSTRACT: Experience of hard calcite (CaCO3) scale formation in green liquor pipelines at four kraft pulp mills was systematically investigated to determine if there is any correlation between the severity of the scaling problem at each mill and the design and operating conditions of its causticizing plant. The results show that the high degree of supersaturation of calcium ions (Ca2+) in the liquor is the main contributing factor. Mills that operate at a lower green liquor total titratable alkali (TTA), higher causticity, and a larger liquor temperature drop are more likely to produce a green liquor that is supersaturated with Ca2+, and thus experience more severe scaling problems. In order to minimize CaCO3 scaling, the green liquor handling equipment should be operated as steady as possible to avoid conditions that allow Ca2+ to be supersaturated. The strategies include minimizing variations in liquor TTA, insulating the green liquor pipelines to reduce temperature gradients, and adding lime mud to weak wash to provide seeds for precipitation to occur on mud particles instead of on metal substrate.
Journal articles
Black liquor gasification with direct Causticization using titanates in a Pressurized entrained-flow reactor. part i: kinetics of the causticization reaction , Journal of Pulp and Paper Science, April 2003, Vol. 29(4) (433KB)
Black liquor gasification with direct Causticization using titanates in a Pressurized entrained-flow reactor. part i: kinetics of the causticization reaction , Journal of Pulp and Paper Science, April 2003, Vol. 29(4) (433KB)
Journal articles
Magazine articles
Extending Its Reach, Paper360º, July/August 2017
Extending Its Reach, Paper360º, July/August 2017
Journal articles
Magazine articles
Saica Champblain Beats Mist—But How?, Paper360º March/April 2020
Saica Champblain Beats Mist—But How?, Paper360º March/April 2020
Journal articles
Magazine articles
Textiles: A New Door of Opportunity Opens, Paper360º November/December 2022
Journal articles
Magazine articles
TAPPI Journal Summaries, Paper360º May/June 2021
TAPPI Journal Summaries, Paper360º May/June 2021
Journal articles
Magazine articles
TAPPI Journal Summaries, Paper360º November/December 2020
TAPPI Journal Summaries, Paper360º November/December 2020
Journal articles
Magazine articles
Best Practices for Wastewater Treatment and Management, Pape
Best Practices for Wastewater Treatment and Management, Paper360º November/December 2016