초록 ▼

The object of the invention is a continuous method for obtaining glass, comprising steps consisting of: charging raw materials upstream of a furnace, along which a plurality of burners is disposed,obtaining a mass of molten glass, and thenleading said mass of molten glass to a zone of the furnace si

The object of the invention is a continuous method for obtaining glass, comprising steps consisting of: charging raw materials upstream of a furnace, along which a plurality of burners is disposed,obtaining a mass of molten glass, and thenleading said mass of molten glass to a zone of the furnace situated further downstream, at least one burner disposed in the region of this zone being fed with an over-stoichiometric quantity of oxidant, and then,forming a glass sheet, said glass sheet having a chemical composition that comprises the following constituents in an amount varying within the weight limits defined below: SiO260-75% Al2O30-10%B2O30-5%, preferably 0 CaO5-15%MgO0-10%Na2O5-20%K2O0-10%BaO0-5%, preferably 0,SO30.1-0.4% Fe2O3 (total iron)0 to 0.015%,  Redox0.1-0.3.

대표청구항 ▼

1. A glass production method, comprising: charging raw materials in an upstream part of a furnace, wherein a plurality of burners are disposed along the upstream part,obtaining a mass of molten glass, and thenleading said mass of molten glass to a zone of the furnace situated further downstream, whe

1. A glass production method, comprising: charging raw materials in an upstream part of a furnace, wherein a plurality of burners are disposed along the upstream part,obtaining a mass of molten glass, and thenleading said mass of molten glass to a zone of the furnace situated further downstream, wherein at least one burner is disposed in the region of this zone being fed with an over-stoichiometric quantity of oxidant, and then,forming a glass sheet, said glass sheet having a chemical composition that comprises the following constituents in an amount varying within the weight limits defined hereinafter: SiO260-75%;Al2O3 0-10%;B2O3 0-5%;CaO 5-15%;MgO 0-10%;Na2O 5-20%;K2O 0-10%;BaO 0-5%;SO3 0.2-0.4%;Fe2O3 (total iron) 0 to 0.015%; andRedox 0.2-0.3%. 2. The method as claimed in claim 1, wherein the furnace comprises several overhead burners disposed in the region of the sidewalls of the furnace, each of said burners being able to develop a flame transversely to the axis of the furnace. 3. The method as claimed in claim 2, wherein the overhead burners are disposed regularly upstream to downstream and are arranged in pairs of burners facing each other, the burners of each pair operating alternately so that at a given instant only burners disposed in the region of one of the sidewalls develop a flame. 4. The method as claimed in claim 3, wherein the furnace comprises between 6 and 8 pairs of burners and only the two or three pairs of burners situated furthest downstream, or the last pair of burners situated furthest downstream, are fed with an over-stoichiometric quantity of oxidant. 5. The method as claimed in claim 1 wherein the furnace comprises, from upstream to downstream, a first chamber delimiting a glass melting zone and then a refining zone and then a second chamber delimiting a cooling zone for molten glass, all the burners being disposed in the region of the first chamber. 6. The method as claimed in claim 5, wherein each burner fed with an over-stoichiometric quantity of oxidant is situated in the region of the glass refining zone. 7. The method as claimed in claim 1, wherein the burners are fed with air and fuel. 8. The method as claimed in claim 7, wherein the fuel is chosen from natural gas and fuel oil or any mixtures thereof. 9. The method as claimed in claim 1, wherein the over-stoichiometric quantity of oxidant is such that the molar ratio of oxygen to fuel is between 1.05 and 1.5. 10. The method as claimed in claim 1, wherein the glass sheet is formed by floating on a bath of tin.