Oxygen Ion Activity and the Solubility of Sulfur Trioxide in Sodium Silicate Melts |
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Authors: | STIG HOLMQUIST |
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Affiliation: | Owens-Illinois Technical Center, Toledo, Ohio 43601 |
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Abstract: | The solubility of sulfur trioxide in sodium silicate melts was determined from 1150° to 1250°C by equilibrating melts in gas mixtures of known contents of sulfur dioxide and oxygen. Sulfate forms according to the reactions: O2-+ SO2+ 1/2O2= O2-+ SO3= SO42-. The data obtained at 1200°C were interpreted by the linear equation: log(SO42-) = log( P so2½ P o21/2) + log Y in which Y is a function of the soda/silica ratio. A series of parallel lines was obtained. Relative free oxygen ion activities calculated for 1200°C were in good agreement with theoretical values calculated from the thermodynamic model of Toop and Samis. |
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