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Borate autocausticizing equilibria in recovery boiler smelt
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry.
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2005 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 20, no 2, 232-236 p.Article in journal (Refereed) PublishedText
Abstract [en]

The effect of the potassium and boron concentration in an alkali carbonate/borate mixture and the effect of CO, concentration in the gas were studied with thermogravimetry and thermal analysis up to 900 degrees C. Results show that the auto-causticizing reaction is readily reversible with 1 % CO2 or higher in the gas if the mixtures contain only sodium compounds. Both a higher CO, concentration and a higher potassium concentration lead to lower autocausticizing. In systems that contain only potassium compounds, the autocausticizing is low and no recarbonation is observed. In potassium-rich systems, volatilization of alkali- and/or boron-components becomes more prominent than in sodium systems.

Place, publisher, year, edition, pages
Stockholm: AB Svensk papperstidning , 2005. Vol. 20, no 2, 232-236 p.
Keyword [en]
alkali berates, boron, chemical equilibria, chemical recovery, decarbonation, partial borate autocausticizing, recovery boiler, smelt
National Category
Materials Engineering
URN: urn:nbn:se:umu:diva-120455ISI: 000230271800016OAI: diva2:928981
Available from: 2016-05-17 Created: 2016-05-16 Last updated: 2016-05-17Bibliographically approved

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Backman, Rainer
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