Borate autocausticizing equilibria in recovery boiler smelt

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Lindberg D, Perander L, Backman R, Hupa M, Kochesfahani S, Rickards H
Förläggare: AB SVENSK PAPPERSTIDNING
Publiceringsår: 2005
Tidskrift: Nordic Pulp and Paper Research Journal
Tidskriftsakronym: NORD PULP PAP RES J
Volym: 20
Nummer: 2
Artikelns första sida, sidnummer: 232
Artikelns sista sida, sidnummer: 236
Antal sidor: 5
ISSN: 0283-2631


Abstrakt

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.


Nyckelord

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

Senast uppdaterad 2020-03-04 vid 05:26