US 7,448,231 B2
	Process for preparing batch materials for the manufacture of glass
Pierre Jeanvoine, Poissy (France); and Arnaud Le Verge, Paris (France)
Assigned to Saint-Gobain Glass France, Courbevoie (France)
Appl. No. 10/490,215 PCT Filed Oct. 04, 2002, PCT No. PCT/FR02/03398 § 371(c)(1), (2), (4) Date Nov. 03, 2004, PCT Pub. No. WO03/031357, PCT Pub. Date Apr. 17, 2003.
Claims priority of application No. 01 13021 (FR), filed on Oct. 08, 2001.
Prior Publication US 2005/0056058 A1, Mar. 17, 2005
Int. Cl. C03B 3/00 (2006.01); C03B 5/235 (2006.01); C03B 1/00 (2006.01)

U.S. Cl. 65—134.5  [423/331; 423/332; 423/334; 501/27]

17 Claims

1. 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).