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.
Original language | Undefined/Unknown |
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Pages (from-to) | 232–236 |
Number of pages | 5 |
Journal | Nordic Pulp and Paper Research Journal |
Volume | 20 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2005 |
MoE publication type | A1 Journal article-refereed |
Keywords
- alkali berates
- boron
- chemical equilibria
- chemical recovery
- decarbonation
- partial borate autocausticizing
- recovery boiler
- smelt