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Fate of phosphorus in the recovery cycle of the kraft pulping process, TAPPI Journal March 2020
ABSTRACT: The accumulation of nonprocess elements in the recovery cycle is a common problem for kraft pulp mills trying to reduce their water closure or to utilize biofuels in their lime kiln. Nonprocess elements such as magnesium (Mg), manganese (Mn), silicon (Si), aluminum (Al), and phosphorus (P) enter the recovery cycle via wood, make-up chemicals, lime rock, biofuels, and process water. The main purge point for these elements is green liquor dregs and lime mud. If not purged, these elements can cause operational problems for the mill. Phosphorus reacts with calcium oxide (CaO) in the lime during slaking; as a result, part of the lime is unavailable for slaking reactions. The first part of this project, through laboratory work, identified rhenanite (NaCa(PO4)) as the form of P in the lime cycle and showed the negative effect of P on the availability of the lime. The second part of this project involved field studies and performing a mass balance for P at a Canadian kraft pulp mill.
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Stay in Compliance with Automated Wastewater Treatment, Paper360º March/April 2020
Stay in Compliance with Automated Wastewater Treatment, Paper360º March/April 2020
Journal articles
Magazine articles
Effects of a PFI refiner’s operational parameters on the swellability of recycled fiber, TAPPI Journal May 2020
ABSTRACT: This paper presents data on the effects of operational parameters (number of revolutions, linear pressure, and gap) of the PFI refiner on the swellability of recycled fiber, which was characterized by water retention value (WRV). The results showed that the increase of recycled fiber’s WRV was proportional to the number of revolutions and the linear pressure, but inversely proportional to the gap. The mathematical relation between these parameters and the fiber WRV could be described by an empirical model for gaps greater than 0.1 mm. Scanning electron microscopic images of fiber morphology showed that the basic framework of fibers could be maintained with the gap greater than 0.1 mm, but was destroyed with smaller gaps. This model provides a technical reference for quantitative control of refining treatment and an effective method for improving recycled fiber quality.
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Alternative “green” lime kiln fuels: Part I—Pulping/recovery byproducts, TAPPI Journal May 2020
ABSTRACT: This paper is the first of a two-part series on “green” lime kiln fuels. The first part of this work reviews the use of pulp mill and recovery byproducts as either full or partial replacement of oil or natural gas in the kiln. The second part reviews the use of various forms of woody biomass, bio-oils, gasification, and hydrogen as potential carbon neutral or carbon-free lime kiln fuels.
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Editor's Note: An Ideal Raw Material for Pulp and Paper, TAP
Editor's Note: An Ideal Raw Material for Pulp and Paper, TAPPI JOURNAL March 2010
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Walter Schalka: RISI’s Four-time Latin American CEO of the Year, Paper360º September/October
Walter Schalka: RISI’s Four-time Latin American CEO of the Year, Paper360º September/October
Journal articles
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TAPPI Journal Summaries, Paper360º September/October
TAPPI Journal Summaries, Paper360º September/October
Journal articles
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TAPPI Journal Summaries, Paper360º May/June 2018
TAPPI Journal Summaries, Paper360º May/June 2018
Journal articles
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Paper Chemistry: What’s New, What’s Next, Paper360º March/
Paper Chemistry: What’s New, What’s Next, Paper360º March/April 2017
Journal articles
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New Outlook for Ecologic, Paper360º March/April 2017
New Outlook for Ecologic, Paper360º March/April 2017