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
Visual recovery boiler inspection, TAPPI JOURNAL, December 1994, Vol. 77(12)
Visual recovery boiler inspection, TAPPI JOURNAL, December 1994, Vol. 77(12)
Journal articles
Upgraded recovery boiler meets low air emissions standards, TAPPI JOURNAL, December 1994, Vol. 77(12)
Upgraded recovery boiler meets low air emissions standards, TAPPI JOURNAL, December 1994, Vol. 77(12)
Journal articles
Bimodal fume particle size distributions from recovery boiler and laboratory scale black liquor combustion, TAPPI JOURNAL, December 1994, Vol. 77(12)
Bimodal fume particle size distributions from recovery boiler and laboratory scale black liquor combustion, TAPPI JOURNAL, December 1994, Vol. 77(12)
Journal articles
Influence of voids on the engineering constants of paper par
Influence of voids on the engineering constants of paper part 2: void modeling, TAPPI JOURNAL, December 1994, Vol. 77(12)
Journal articles
Environmental compatibility of effluents of aspen biomechanical pulps, TAPPI JOURNAL, January 1994, Vol. 77(1)
Environmental compatibility of effluents of aspen biomechanical pulps, TAPPI JOURNAL, January 1994, Vol. 77(1)
Journal articles
The use of xylanases in kraft pulp bleaching: a review, TAPPI JOURNAL, June 1994, Vol. 77(6)
The use of xylanases in kraft pulp bleaching: a review, TAPPI JOURNAL, June 1994, Vol. 77(6)
Journal articles
Stainless steel piping for pulp handling and chemical recovery, TAPPI JOURNAL, June 1994, Vol. 77(6)
Stainless steel piping for pulp handling and chemical recovery, TAPPI JOURNAL, June 1994, Vol. 77(6)
Journal articles
Recovery of Sulfur from Spent Semichemical Pulping Liquors,
Recovery of Sulfur from Spent Semichemical Pulping Liquors, 1991 Engineering Conference Proceedings
Journal articles
Magazine articles
Effects of agitator blade scaling on mixing in dissolving tanks, TAPPI Journal April 2022
ABSTRACT: Hard calcium carbonate scale often forms on the agitators in smelt dissolving tanks. The effects of this scale on mixing are not well understood. While mixing in tanks has often been modeled in the literature, there have been no studies involving agitator scaling. To better understand the impact of agitator scaling on hydrodynamics and tank concentrations, a steady state, three-dimensional (3D) model has been developed for a smelt dissolving tank at a kraft pulp mill. In this work, four cases are compared: an agitator with no scaling, mild scaling, moderate scaling, and extreme scaling. The extreme scaling case is representative of scale buildup on a dissolving tank agitator that was significant enough that the agitator had to be stopped and cleaned. The reduction in the agitator fluid jet velocity is relatively small for the mild and moderate scaling cases, but it becomes more significant for the extreme scaling case, for which the results indicate that the mixing of the smelt with the weak wash is likely poor and that there would thus be a risk of smelt pooling.
Journal articles
Magazine articles
A model black liquor formulation for use in development and evaluation of membranes for concentrating weak black liquor, TAPPI Journal February 2022
ABSTRACT: As part of a larger program to develop robust membranes for concentrating weak black liquor prior to the evaporation step, several commercially available membranes were tested for suitability in this application. Given the variation in kraft black liquor for various wood species, the mill-to-mill variations, and the challenges of obtaining fresh samples, the need became apparent for a synthetic reference black liquor that would allow any membrane developer to test a new prototype membrane and compare the results with others. We present a formulation for a model black liquor (MBL) similar to real kraft black liquor in the composition of the major species that can be formulated from readily available reagents. The MBL was tested with two commercial membranes and resulted in similar levels of lignin retention as the real black liquor. It also showed similar viscosity behavior to real black liquor as a function of solids content.