Search
Use the search bar or filters below to find any TAPPI product or publication.
Filters
Content Type
Publications
Level of Knowledge
Committees
Collections
Journal articles
Magazine articles
Removal of silicon from green liquor with low-temperature precausticizing, TAPPI JOURNAL January 2017
Removal of silicon from green liquor with low-temperature precausticizing, TAPPI JOURNAL January 2017
Journal articles
Magazine articles
Melt-blown compostable polyester films with lignin, TAPPI J
Melt-blown compostable polyester films with lignin, TAPPI JOURNAL March 2017
Journal articles
Magazine articles
How to use total dissolved solids measurements to evaluate the performance of diffuser washers—A mill study, TAPPI Journal April 2020
ABSTRACT: Various types of pulp washing equipment are available. Each washing device has a unique mechanical construction, and the washing principle is often a combination of dilution, thickening, and displacement washing. In this work, the performance of the pressure diffuser washer is studied. In stepwise trials, the effect of the feed and discharge consistencies on the performance of the diffuser was studied. The effect of the downward velocity of the screen on the pressure diffuser’s washing efficiency was also studied. The measurement of total dissolved solids (TDS) by a process refractometer was used as a wash loss measurement unit and the refractometer’s results were used in the calculations of standardized Nordén efficiency (E10) values. The chemical oxygen demand (COD) and conductivity values were also measured and their results compared to the TDS results.The results indicated that feed consistency has a significant effect on the performance and effectiveness of the diffuser washers in the mill. It can also be stated that when the downward velocity of the screen is adjusted to too high a level, the washing efficiency of the pressure diffuser decreases. As a conclusion from the mill tests, it can be stated that even small process parameter changes can provide enhanced diffuser washing at the beginning of the washing line, which has a direct effect on the performance of post-oxygen washing.
Journal articles
Magazine articles
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.
Journal articles
Editorial: Honghi Tran: A Prolific TAPPI Journal, TAPPI JOUR
Editorial: Honghi Tran: A Prolific TAPPI Journal, TAPPI JOURNAL July 2016
Journal articles
Corrosion Mnitoring and Root Cause Identification in High So
Corrosion Mnitoring and Root Cause Identification in High Solids Concentrators, TAPPI JOURNAL July 2016
Journal articles
Decreasing specific energy of thermomechanical pulps from reduction of raw materials variability, TAPPI JOURNAL September 2009
Decreasing specific energy of thermomechanical pulps from reduction of raw materials variability, TAPPI JOURNAL September 2009
Journal articles
Pre-Extraction of Hemicelluloses and Subsequent Kraft Pulping, Part II: Acid- and Autohydrolysis, TAPPI JOURNAL September 2009
Pre-Extraction of Hemicelluloses and Subsequent Kraft Pulping, Part II: Acid- and Autohydrolysis, TAPPI JOURNAL September 2009
Journal articles
Optimization of ECF Bleaching of Kraft Pulp: Part 1. Optimal Bleaching of Hardwood Pulps Made with DifferentAlkali Charges, TAPPI JOURNAL January 2008
Optimization of ECF Bleaching of Kraft Pulp: Part 1. Optimal Bleaching of Hardwood Pulps Made with DifferentAlkali Charges, TAPPI JOURNAL January 2008
Journal articles
Determination of the mineral constituents of recycled paper mill sludge, TAPPI JOURNAL June 2008
Determination of the mineral constituents of recycled paper mill sludge, TAPPI JOURNAL June 2008