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Modelling of precipitation of silicon, aluminium and phosphorus into green liquor dregs
RISE - Research Institutes of Sweden, Bioeconomy.
RISE - Research Institutes of Sweden, Bioeconomy.
RISE - Research Institutes of Sweden, Bioeconomy.
2017 (English)In: International chemical recovery conference, May 24-26, 2017, Halifax, Canada, 2017Conference paper, Published paper (Refereed)
Abstract [en]

A set of empirical equations is presented for modelling the precipitation of aluminium, silicon and phosphorous in green liquor plants as a function of initial concentrations of these elements plus magnesium, calcium and alkali in the dissolver. As process parameters, the model includes residence time and temperature. Concentrations, temperature and residence time have been varied according to a factor design plan. Main findings are that in laboratory experiments it was possible to remove aluminium, silicon and phosphorous down to concentrations below their solubility in white liquor thus avoiding accumulation of these elements in the lime cycle. In addition, the experimental work showed that the initial concentrations of aluminium, silicon and phosphorous in raw green liquor have a strong increasing impact on their concentrations in filtered green liquor.

Place, publisher, year, edition, pages
2017.
Keywords [en]
non process element, green liquor, solubility, laboratory experiment, modelling, precipitation, aluminium, silicon, phosphorus
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-33024OAI: oai:DiVA.org:ri-33024DiVA, id: diva2:1172769
Conference
International chemical recovery conference (ICRC 2017), May 24-26, 2017, Halifax , Canada
Available from: 2018-01-10 Created: 2018-01-10 Last updated: 2018-01-11Bibliographically approved

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