초록 ▼

One subject of the invention is a process for manufacturing a glass, the chemical composition of which comprises at least 3% by weight of iron oxide, expressed in the form Fe2O3, comprising a step of electric melting, using electrodes submerged in the molten glass, of a vitrifiable batch material mi

One subject of the invention is a process for manufacturing a glass, the chemical composition of which comprises at least 3% by weight of iron oxide, expressed in the form Fe2O3, comprising a step of electric melting, using electrodes submerged in the molten glass, of a vitrifiable batch material mixture containing at least one manganese carrier wherein the manganese is in an oxidation state higher than +2.

대표청구항 ▼

1. A process for manufacturing a glass comprising from 3-15% by weight of iron oxide, expressed in the form Fe2O3, the process comprising: electric melting, with electrodes submerged in a molten glass, of a vitrifiable batch material mixture comprising at least one manganese carrier in which mangane

1. A process for manufacturing a glass comprising from 3-15% by weight of iron oxide, expressed in the form Fe2O3, the process comprising: electric melting, with electrodes submerged in a molten glass, of a vitrifiable batch material mixture comprising at least one manganese carrier in which manganese is in an oxidation state higher than +2,wherein the glass comprises, by weight percentages: SiO235-55%;Al2O314-27%;CaO12-16%;MgO 0-6%;Na2O + K2O 1-17%;B2O3 0-8%;P2O5 0-3%; andTiO2 0-2%, andwherein the glass comprises a combined content of CaO and MgO in the range of 14 to 18% by weight. 2. The process of claim 1, wherein the at least one manganese carrier is selected from MnO2, Mn3O4, Mn2O3, Mn2O7, a permanganate, or any mixture thereof. 3. The process of claim 1, wherein a total amount of manganese carrier contained in the vitrifiable batch material mixture is such that one ton of a dry mixture thereof comprises an amount ranging from 1 to 20 kg of manganese in an oxidation state higher than +2, expressed in the form MnO2. 4. The process of claim 1, wherein the at least one manganese carrier is selected from Mn3O4, Mn2O3, Mn2O7, a permanganate, or any mixture thereof. 5. The process of claim 1, wherein the at least one manganese carrier is Mn2O3. 6. The process of claim 1, wherein a total amount of manganese carrier contained in the vitrifiable batch material mixture is such that one ton of a dry mixture thereof comprises an amount ranging from 2 to 10 kg of manganese in an oxidation state higher than +2, expressed in the form MnO2. 7. The process of claim 1, wherein a total amount of manganese carrier contained in the vitrifiable batch material mixture is such that one ton of a dry mixture thereof comprises an amount ranging from 4 to 8 kg of manganese in an oxidation state higher than +2, expressed in the form MnO2. 8. The process of claim 1, wherein the glass composition comprises at least 0.3% by weight of manganese oxide, expressed in the form MnO2. 9. The process of claim 1, wherein the vitrifiable mixture contains no nitrate. 10. The process of claim 1, wherein the glass comprises a combined content of CaO and MgO in the range of 15 to 18% by weight. 11. The process of claim 1, wherein the electrodes comprise molybdenum. 12. The process of claim 1, wherein the electrodes comprise tin oxide. 13. The process of claim 1, wherein during the melting the temperature of the molten glass, measured in contact with tank refractories and at a hottest point, ranges from 1400° C. to 1650° C. 14. The process of claim 1, wherein after the melting the molten glass is formed into mineral wool during a fiberizing step.