New challenges regarding nonprocess elements in the liquor and lime cycle
Source abstract
Abstract
Optimal performance of the green liquor plant, recausticizing plant, and lime cycle is vital for adequate white liquor availability and quality as well as for a mill’s energy efficiency. Recently, various problems in the liquor and lime cycle have been frequently reported by our industrial partners, including poor performance of green liquor filters or sludge filters, decreased filterability of lime mud, increased lime kiln dead load, and poorquality white liquor. Those problems are most likely caused by an accumulation of nonprocess elements in the liquor and lime cycle due to increased mill closure, increased use of biofuels, or both. Data from the literature and earlier studies have been analyzed with regard to the occurrence and concentration of nonprocess elements in various process streams, including filtered green liquor, green liquor sludge, lime mud, and white liquor. The mineral forms in which nonprocess elements often precipitate were also studied, together with the common knowledge and rules of thumb used by mills for dealing with the problems. The literature data are compared with the newest analytical results from a sampling campaign involving several mills with varying process solutions with respect to nonprocess elements. The consequences and possible recommendations for the mills are presented.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Minerals Flotation and Separation Techniques · Metal Extraction and Bioleaching · Extraction and Separation Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (11)
Show source-provided references
1. Taylor, K. and Bossons, D., Pulp Pap. Can. 107(3): 37(2006).
2. Taylor, K. and McGuffie, B., Pulp Pap. Can. 108(2): 27 (2007).
3. Ribeiro, J.C.T., Santos, S.M., and Tran, H., “Experience of low lime mud solids problems at a kraft pulp mill,” Int. Chem. Recovery Conf., TAPPI PRESS, Atlanta, GA, USA, 2007, p. 567.
4. Ulmgren, P. “The removal of aluminum from the recovery system of a closed kraft pulp mill,” Int. Chem. Recovery Conf., TAPPI PRESS, Atlanta, 1985, p. 299.10.3183/npprj-1987-02-01-p004-009 ↗
5. Lidén, J. “Green liquor dregs; its origin, and effects in the lime cycle,” Int. Chem. Recovery Conf., TAPPI PRESS, Atlanta, 1995, p. A291.
6. Ulmgren, P., Nord. Pulp Pap. Res. J. 1(12): 32(1997).10.3183/npprj-1997-12-01-p032-041 ↗
7. Richardson, B., Lownertz, P., Forget, C., et al., “Behavior of nonprocess elements in the kraft recovery system,” Int. Chem. Recovery Conf., TAPPI PRESS, Atlanta, 1998, p. 1025.
8. Wannenmacher, N., Kimura, S., and Frederick, W.J., Ind. Eng. Chem. Res. 44(24): 9316(2005).10.1021/ie050353c ↗
9. Berglin, N., Lovell, A., Delin, L., et al., “The 2010 reference mill for kraft market pulp,” PEERS Conf., TAPPI PRESS, Atlanta, 2011, p. 273.
10. Ulmgren, P., “Processfrämmande grundämnen i vitlutsberedningen del 1,” SCAN FORSK-Rapport 512, STFI, Stockholm, 1998.
11. Empie, H.J., Ellis, M., and Amundsen, M., “Fundamentals of dregs removal,” Final Progress Report to the Member Companies of the Institute of Paper Science and Technology, Georgia Institute of Technology, Atlanta, 1999.