Method for preparing raw materials for glass-making
AssigneeSaint-Gobain Glass France
InventorPierre Jeanvoine
Life of this patent
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Abstract
The subject of the invention is a process for manufacturing compounds based on one or more silicates of alkali metals, such as Na and K and/or alkaline earth metals such as Ca, Mg, and/or on rare earths, such as Ce, optionally in the form of mixed silicates which combine alkaline-earth metals, such as Ca, with the alkali metal(s) and the rare earth(s), by conversion of silica and of halides, especially of one or more chlorides, or sulfate or nitrate, of the said alkali metals and/or of the said rare earths and/or of the said alkaline-earth metals, such as NaCl, KCl or CeCl4. The heat needed for the conversion is supplied, at least partly, by one or more submerged burners. The subject of the invention is also an apparatus for carrying out the process and for its use.
Claims39
A process for producing at least one alkali metal, alkaline-earth metal, or rare earth metal silicate, or a mixed silicate thereof, comprising,
- reacting silica and at least one alkali metal, alkaline-earth metal, or rare earth metal halide, sulfate or nitrate in a contiguous molten mass in a reactor, and
- removing said at least one alkali metal, alkaline-earth metal, or rare earth metal silicate, or a mixed silicate thereof, from said reactor in a molten state,
- wherein beat and turbulence are supplied to said molten mass by combustion from one or more submerged burners.
Dependencies are inferred from the claim text.