US 7,578,988 B2
	Preparation of silicate or glass in a furnace with burners immersed in a reducing medium
Remi Jacques, Aubervilliers (France); Pierre Jeanvoine, Courbevoie (France); Biagio Palmieri, Aubervilliers (France); and Melanie Rattier, Paris (France)
Assigned to Saint-Gobain Glass France, Courbevoie (France)
Appl. No. 10/572,452 PCT Filed Sep. 07, 2004, PCT No. PCT/FR2004/050416 § 371(c)(1), (2), (4) Date Nov. 13, 2006, PCT Pub. No. WO2005/028364, PCT Pub. Date Mar. 31, 2005.
Claims priority of application No. 03 11006 (FR), filed on Sep. 19, 2003; application No. 03 12383 (FR), filed on Oct. 23, 2003; and application No. 03 13272 (FR), filed on Nov. 13, 2003.
Prior Publication US 2007/0122332 A1, May 31, 2007
Int. Cl. C01B 33/20 (2006.01); C01B 33/24 (2006.01); C01B 33/32 (2006.01)

U.S. Cl. 423—326  [423/331; 423/332]

22 Claims

1. A process for preparing a silicate of an element chosen from alkali metals, alkaline-earth metals or rare earths, comprising reacting silica and a sulfate of said element in a reactor equipped with at least one submerged burner within a molten mass, said submerged burner being supplied with an oxygen-containing gas, an excess of reducing fuel being introduced into the reactor relative to the effectively consumed oxygen, wherein the silicate does not contain sulfate inclusion.