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Journal articles
Magazine articles
Open Access
Sulfur makeup in an unbleached kraft pulp mill, TAPPI Journal August 2024

ABSTRACT: Sodium sesquisulfate or “sesqui” (Na3H(SO4)2) is a by-product of chlorine dioxide production at kraft pulp mills. It is typically used for sodium and sulfur makeup in the liquor loop. Mondi Hinton Inc. (MHI) in Hinton, AB, Canada, was converting from bleached to unbleached kraft pulp production and was thus losing this source of makeup. The only option that was readily available as a substitute was sodium hydrosulfide (NaHS), which was cost prohibitive. Other options such as sodium sulfate (Na2SO4), emulsified sulfur, sulfuric acid (H2SO4), and sodium bisulfite (NaHSO3) were compared. The mill concluded that pelletized sulfur plus sodium hydroxide or “caustic soda” (NaOH) was the best option. Laboratory-scale experiments showed that pelletized sulfur dissolved in white liquor (WL). A mill-scale trial revealed that pelletized sulfur added to a causticizer had no adverse impacts on the downstream pressure filters or kiln operation. The sulfur reacted to produce polysulfide upstream of the WL storage tank, giving the liquor an orange hue. This polysulfide appeared to partially degrade into thiosulfate before being fed to the digester. The heavy black liquor (HBL) sulfur:sodium (S:Na) ratio did not change significantly, even though the sulfur/soda addition location was upstream of the original one. In addition, other properties such as liquor heating value and elemental analysis did not significantly change. Due to polysulfide/thiosulfate concentration in the white liquor, it was determined that the carbon steel equipment was at risk for corrosion. During the annual turnaround that occurred eight months after the addition of sulfur was started, the wash zone of the digester showed no signs of thinning/damage. The mill has been running exclusively with pelletized sulfur for 22 months (as of August 2024), realizing significant cost savings compared to the use of NaHS or other sulfur/soda addition options.

Journal articles
Open Access
Electrochemical Removal of Color and Toxicity from Bleached

Electrochemical Removal of Color and Toxicity from Bleached Kraft Effluents, 1994 Environmental Conference Proceedings

Magazine articles
Open Access
Editor's Note: Collecting industry information that counts,

Editor's Note: Collecting industry information that counts, TAPPI JOURNAL April 2010

Journal articles
Open Access
Reappraisal of the role of turpentine vapor in noncondensible gas explosions, TAPPI JOURNAL April 2010

Reappraisal of the role of turpentine vapor in noncondensible gas explosions, TAPPI JOURNAL April 2010

Journal articles
Open Access
Effects of impregnation time on hardwood kraft pulp characteristics and papermaking potential â?¢ a mill study, TAPPI JOURNAL April 2010

Effects of impregnation time on hardwood kraft pulp characteristics and papermaking potential • a mill study, TAPPI JOURNAL April 2010

Journal articles
Open Access
Ozone-enhanced bleaching of softwood kraft pulp, TAPPI JOURNAL August 2010

Ozone-enhanced bleaching of softwood kraft pulp, TAPPI JOURNAL August 2010

Journal articles
Open Access
Optimization of elemental chlorine-free bleaching for a softwood kraft pulp â?¢ part 1: impact of oxidative extraction on chlorine dioxide stoichiometry, TAPPI JOURNAL August 2010

Optimization of elemental chlorine-free bleaching for a softwood kraft pulp • part 1: impact of oxidative extraction on chlorine dioxide stoichiometry, TAPPI JOURNAL August 2010

Journal articles
Open Access
Online monitoring of inorganic cooking chemicals in white liquor by pulse voltammetry, TAPPI JOURNAL August 2010

Online monitoring of inorganic cooking chemicals in white liquor by pulse voltammetry, TAPPI JOURNAL August 2010

Journal articles
Open Access
CFD-Based Modeling of Kraft Char Beds â?¢ Part 2: A Study on the Effects of Droplet Size and Bed Shape on Bed Processes, TAPPI JOURNAL February 2010

CFD-Based Modeling of Kraft Char Beds • Part 2: A Study on the Effects of Droplet Size and Bed Shape on Bed Processes, TAPPI JOURNAL February 2010

Journal articles
Open Access
Study on the Chemical Modification Process of Jute Fiber, TAPPI JOURNAL February 2010

Study on the Chemical Modification Process of Jute Fiber, TAPPI JOURNAL February 2010

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