Method for vacuum-degassing molten glass, apparatus for vacuum-degassing molten glass, process for producing molten glass, apparatus for producing molten glass, process for producing glass product, and apparatus for producing glass product

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=pSO₂/P_{abs 2.0}  (1)wherein SS is the supersaturation degree of SO₂ in the molten glass, pSO₂ is the partial pressure (Pa) of SO₂, and P_abs is the pressure (Pa) at the bottom portion of the glass flow passage of the vacuum degassing vessel.