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Journal articles
Magazine articles
TAPPI News, Paper360º November/December 2019

TAPPI News, Paper360º November/December 2019

Journal articles
Magazine articles
ASPI News, Paper360º November/December 2019

ASPI News, Paper360º November/December 2019

Journal articles
Magazine articles
Open Access
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.

Journal articles
Magazine articles
Open Access
Editorial: Kathleen Bennett: Opportunities for paper are pro

Editorial: Kathleen Bennett: Opportunities for paper are proliferating, TAPPI JOURNAL May 2016

Magazine articles
Open Access
Leveraging mill-wide big data sets for process and quality i

Authors: Jianzhong Fu and Peter W. Hart | ABSTRACT: The MWV mill in Covington, VA, USA, experienced a long term trend of increasing episodes of paper indents that resulted in significant quantities of internal rejects and production downtime. When traditional troubleshooting techniques failed to resolve the problem, big data analysis techniques were employed to help deter-mine root causes of this negative and increasingly frequent situation. Nearly 6000 operating variables were selected for a deep dive, multi-year analysis after reviewing mill-wide process logs and 60000+ PI tags (data points) collected from one of the major data historian systems at the MWV Covington mill. Nine billion data points were collected from November 2011 to August 2014. Strategies and methods were developed to format, clean, classify, and sort the various data sets to compensate for process lag time and to align timestamps, as well as to rank potential causes or indicators. GE Intelligent Platforms software was employed to develop decision trees for root cause analysis. Insights and possible correlations that were previously invisible or ignored were obtained across the mill, from pulp-ing, bleaching, and chemical recovery to the papermaking process. Several findings led the mill to revise selected process targets and to reconsider a step change in the drying process. These changes have exhibited significant impacts on the mill’s product quality, cost, and market performance. Mill-wide communications of the identified results helped transform the findings into executable actions. Several projects were initiated.

Magazine articles
SetPoint: Shining a Light, Paper360º May/June 2016

SetPoint: Shining a Light, Paper360º May/June 2016

Magazine articles
Meet the 2016 TAPPI/PIMA Awards Honorees, Paper360º May/Jun

Meet the 2016 TAPPI/PIMA Awards Honorees, Paper360º May/June 2016

Magazine articles
Be Original: The Path to LC Paper’s OnePly Tissue, Paper360º

Be Original: The Path to LC Paper’s OnePly Tissue, Paper360º May/June 2016

Magazine articles
TAPPI JOURNAL Summaries, Paper360º May/June 2016

TAPPI JOURNAL Summaries, Paper360º May/June 2016

Magazine articles
Extending Lifecycle: the Key to Lower Costs, Paper360º May/

Extending Lifecycle: the Key to Lower Costs, Paper360º May/June 2016

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