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US 10,000,404 B2Granted
Glass manufacturing method using electric melting
AssigneeSaint-Gobain Isover
InventorsRichard Clatot, Stéphane Maugendre
Life of this patent
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Abstract
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.
Claims14
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:
- SiO2
- 35-55%;
- Al2O3
- 14-27%;
- CaO
- 12-16%;
- MgO
- 0-6%;
- Na2O + K2O
- 1-17%;
- B2O3
- 0-8%;
- P2O5
- 0-3%;
- and
- TiO2
- 0-2%, and
- wherein the glass comprises a combined content of CaO and MgO in the range of 14 to 18% by weight.
17 more elements
Dependencies are inferred from the claim text.