In the method and system for producing glass reduction of reduction-sensitive ingredients in the glass is reduced or preferably is avoided during the melting and fining processes. The glass preferably has a high refractive index. During the process an oxidizing agent is inducted into a fining vessel
In the method and system for producing glass reduction of reduction-sensitive ingredients in the glass is reduced or preferably is avoided during the melting and fining processes. The glass preferably has a high refractive index. During the process an oxidizing agent is inducted into a fining vessel and preferably also into a melt crucible made of a slit skull that is cooled by a cooling agent. The oxidizing agent is preferably oxygen. Furthermore a system for conducting the method is also described.
대표청구항▼
1. A process of producing glass in a metallic skull crucible comprising a melt crucible (13), a fining vessel (14) connected to the melt crucible (13) to receive the glass melt from the melt crucible (13), a means for heating the glass melt in the fining vessel inductively with a high-frequency elec
1. A process of producing glass in a metallic skull crucible comprising a melt crucible (13), a fining vessel (14) connected to the melt crucible (13) to receive the glass melt from the melt crucible (13), a means for heating the glass melt in the fining vessel inductively with a high-frequency electromagnetic alternating field, a means for conducting at least one oxidizing agent into the fining vessel, wherein the fining vessel each comprise walls, which are cooled by a cooling agent and which are provided with high-frequency permeable slits, said process comprising the steps of: a) melting a glass batch in the melt crucible to form a glass melt,b) conveying the glass melt to the fining vessel,c) fining the glass melt in the fining vessel at a fining temperature higher than a temperature of the glass melt in the melt vessel,wherein during the fining said at least one oxidizing agent is conducted into the glass melt in the fining vessel so that reduction of reduction-sensitive components in the glass melt is avoided or reduced, andwherein the glass melt in the fining vessel are heated inductively by the means for heating the melt crucible and the fining vessel inductively with a high-frequency electromagnetic alternating field. 2. The process according to claim 1, wherein said at least one oxidizing agent conducted into the glass melt in the fining vessel is selected from the group consisting of oxygen and ozone. 3. The process according to claim 1, further comprising conducting the glass melt into a homogenization vessel, performing a homogenizing process in the homogenization vessel, and conducting at least one oxidizing agent into the glass melt in the homogenization vessel, so that reduction of said reduction-sensitive components in the glass melt is further avoided or reduced. 4. The process according to claim 3, wherein said at least one oxidizing agent conducted into the glass melt in the homogenization vessel is selected from the group consisting of oxygen and ozone. 5. The process according to claim 1, wherein the glass is a high-index glass with a refractive index of at least 1.7. 6. The process according to claim 1, wherein the glass has a composition, in wt. %, comprising: ComponentsWt. %P2O5, B2O3, SiO2 or F 0-50 eachNb2O5, Ta2O5, Bi2O3, Sb2O3 or PbO 0-80 eachWO3 or MoO3 0-30 eachGeO2 0-20MgO, CaO, SrO or BaO 0-40 eachLi2O, Na2O, K2O, Rb2O or Cs2O 0-12 eachZnO or TiO2 0-8 eachΣ Nb2O5, Ta2O5, Bi2O3, Sb2O3, PbO20-80Σ WO3, MoO3, GeO2 0-40Σ alkali metal oxides 0-15Σ alkaline earth metal oxides 0-30. 7. The process according to claim 1, wherein the glass melt in the melt crucible is heated inductively with a high-frequency electromagnetic alternating field. 8. The process according to claim 1, wherein the glass melt in the melt crucible is heated with a burner supplied with fossil fuels and an additional heater initiates a glass melting process to form the glass melt. 9. The process according to claim 1, further comprising conducting the at least one oxidizing agent into the glass melt via bubbling nozzles located in a bottom of the melt crucible and into the glass melt via bubbling nozzles located in a bottom of the fining vessel. 10. The process according to claim 1, wherein the at least one oxidizing agent is conducted in a laminar flow into the glass melt by foamed, porous or perforated structures arranged in a bottom of the melt crucible and/or arranged in a bottom of the fining vessel. 11. The process according to claim 1, further comprising transferring the glass melt from the melt crucible into the fining vessel though a connecting element made from a material selected from the group consisting of platinum, ceramics and steel. 12. The process according to claim 1, further comprising cooling vessel walls of the melt crucible and the fining vessel with a cooling agent to form a solidified crust. 13. The process according to claim 1, wherein said at least one oxidizing agent is oxygen and said oxygen is conducted into the glass melt in said fining vessel at a flow rate that is less than 30 l/h. 14. The process according to claim 13, wherein the oxygen conducted into the glass melt forms bubbles that have a size that is not smaller than 0.5 mm. 15. The process according to claim 1, wherein the glass has a composition, in wt. %, comprising no more than 30 wt. % of SiO2. 16. The process according to claim 1, wherein the fining vessel and/or the melt crucible comprises metal or metal alloy.
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