Borate autocausticizing equilibria in recovery boiler smelt

Daniel Kristoffer Lindberg, L Perander, R Backman, Mikko Hupa, S Kochesfahani, H Rickards

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    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.
    Original languageUndefined/Unknown
    Pages (from-to)232–236
    Number of pages5
    JournalNordic Pulp and Paper Research Journal
    Issue number2
    Publication statusPublished - 2005
    MoE publication typeA1 Journal article-refereed


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

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