Process for preparing batch materials for the manufacture of glass
AssigneeSaint-Gobain Glass France
InventorsPierre Jeanvoine, Arnaud Le Verge
Life of this patent
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Abstract
The invention relates to a process for manufacturing compounds based on one or more silicates of alkali metals and/or of alkaline-earth metals, optionally in the form of mixed silicates that combine at least two of these elements, said process involving: (i) preferably a conversion reaction (1) in which halides of said alkali metals and/or of said rare earths and/or of said alkaline-earth metals are converted into the corresponding sulfates; (iii) a conversion reaction (2) in which said sulfates together with silica are converted into the corresponding silicates, the heat supply needed for this conversion being provided, at least in part, by a combustion reaction (3) using a submerged burner or a plurality of submerged burners.
Claims17
A process for manufacturing compounds based on one or more silicates of alkali metals, and/or of alkaline-earth metals, and/or of rare earths, said process involving a conversion reaction (1) in which halides of alkali metals and/or of rare earths and/or of alkaline-earth metals are converted into the corresponding sulfates in a first reactor, and a conversion reaction (2) in which the sulfates of alkali metals and/or of rare earths and/or of alkaline-earth metals are converted into the corresponding silicates in a second reactor, wherein the heat supply needed for converting the sulfates into the silicates is provided, at least in part, by a combustion reaction (3) using a submerged burner or a plurality of submerged burners, wherein sulfur oxides obtained during conversion reaction (2) are recovered and the sulfur oxides undergo a reaction (4′) to convert them into sulfuric acid, and wherein the sulfuric acid is used in reaction (1).
Dependencies are inferred from the claim text.