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Causes of poor dregs settling in a green liquor clarifier, TAPPI Journal August 2022

ABSTRACT: A study was conducted to examine the most likely parameters responsible for poor dregs settling at a kraft mill over a 2.5-year period, using multivariate data analysis (MVDA) and machine learning (ML) techniques. The dregs settling behavior seems to be seasonally influenced, implying that wood quality variation can be a factor. The results from the MVDA/ML analysis show that poor dregs settling is correlated to incomplete combustion and/or low load conditions in the recovery boiler, low sulfidity in the causticizing plant, and high flow in the green liquor•weak wash cycle. Compositions of dregs and black liquor were also examined to identify correlations with impaired dregs settling. The results show that poor dregs settling strongly correlates with high silicon (Si) content in dregs and moderately correlates with high iron (Fe) and high aluminum (Al) contents, and with low bulk density in dregs. For mills that experience dregs settling or green liquor filtering issues, regular compositional analyses of dregs, green liquor, weak wash, and black liquor are recommended in order to monitor the dynamics of silicon and other constituents in the recovery cycle.

Editorial: Special coating issue contains highlighted works from TAPPICon 2023, TAPPI Journal November 2023

ABSTRACT: Did you know that TAPPI’s Coating and Graphic Arts Division has changed its name to Coating, Printing, and Surface Enhancement (CPSE) Division? This change occurred mid-year, as our members realized that the new name fits much better with the day-to-day workings of the Division, as well as the broader activities to functionalize and add value to paper and paperboard that continue to expand into new arenas.

Opportunities in Bioenergy and the Bioeconomy, Paper360º September/October 2023

A New Vision for Industry Leader IP, Paper360º September/October 2023

ASPI News, Paper360º September/October 2023

Best Practices for Wastewater Treatment and Management, Pape

Best Practices for Wastewater Treatment and Management, Paper360º November/December 2016

Tissue 2017 Marks Exciting New Endeavor, Paper360º November/

Tissue 2017 Marks Exciting New Endeavor, Paper360º November/December 2016

WestRock Hosts 2016 Fall Customer Alignment Meeting, Paper36

ASPI News: WestRock Hosts 2016 Fall Customer Alignment Meeting, Paper360º November/December 2016

Three-dimensional pore structure visualization and character

Three-dimensional pore structure visualization and characterization of paper using X-ray computed tomography, TAPPI JOURNAL September 2017

Effect of surface treatment with biodegradable materials on

Effect of surface treatment with biodegradable materials on properties of linerboard made from old corrugated containers (OCC), TAPPI Journal September 2017