| 摘要 |
To provide a vacuum-degassing method and a vacuum degassing apparatus excellent in the effect of vacuum-degassing molten glass, more specifically, a method for vacuum-degassing molten glass and a vacuum degassing apparatus, capable of effectively suppressing formation of reboil bubbles. A method for vacuum-degassing molten glass, which comprises melting glass materials to be silicate glass and passing the resulting molten glass in a flow passage in a vacuum degassing vessel, the interior of which is maintained in a reduced pressure state, to vacuum-degas the molten glass, wherein vacuum-degassing is carried out under conditions satisfying the following formula (1) at a bottom portion of the vacuum degassing vessel: SS = pSO 2 / P abs < 2.0 wherein SS is the supersaturation degree of SO 2 in the molten glass, pSO 2 is the partial pressure (Pa) of SO 2 , and P abs is the pressure (Pa) at the bottom portion of the glass flow passage of the vacuum degassing vessel. |
