Borate autocausticizing equilibria in recovery boiler smelt

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Lindberg D, Perander L, Backman R, Hupa M, Kochesfahani S, Rickards H
Publisher: AB SVENSK PAPPERSTIDNING
Publication year: 2005
Journal: Nordic Pulp and Paper Research Journal
Journal acronym: NORD PULP PAP RES J
Volume number: 20
Issue number: 2
Start page: 232
End page: 236
Number of pages: 5
ISSN: 0283-2631


Abstract

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.


Keywords

alkali berates, boron, chemical equilibria, chemical recovery, decarbonation, partial borate autocausticizing, recovery boiler, smelt

Last updated on 2019-20-08 at 06:18