Search

TAPPI Journal Summaries, Paper360º May/June 2022

TAPPI JOURNAL Summaries, Paper360º, July/August 2017

TAPPI JOURNAL Summaries, Paper360º, July/August 2017

TAPPI Journal Summaries, Paper360º March/April 2024

TAPPI Journal, Paper360º January/February 2023

TAPPI Journal Summaries, Paper360º March/April 2019

TAPPI Journal Summaries, Paper360º March/April 2019

World’s Most Northerly Paper Mill Makes Sustainable Choices, Paper360º January/February 2024

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.

Practical Strategies to Reduce Pulp and Paper Mill Energy Use, Paper360º July/August 2018

Practical Strategies to Reduce Pulp and Paper Mill Energy Use, Paper360º July/August 2018

Meeting the Future Through Knowledge Sharing and Connection, Paper360º March/April 2023

Woodland Pulp: Local Leadership, Global Competitiveness, Paper360º May/June 2023