METHOD FOR CHARGE PREPARATION FOR PRODUCING COLORLESS SHEET GLASS WITH INCREASED TRANSPARENCY Russian patent published in 2022 - IPC C03B5/00 

FIELD: glass industry.

SUBSTANCE: invention relates to the glass industry and can be used in the production of colorless float glass. Batch preparation includes dosing, mixing and wetting in a mixer of quartz sand, soda ash, dolomite, limestone or marble, feldspar, sodium sulfate, as well as small additives. Before a direct transition, quartz sand and dolomite are replaced with similar materials with a reduced iron oxide content, and marble is used instead of limestone. Further, during the first 20-24 hours of the transition period, selenium, cobalt oxide and erbium oxide are added to each portion of the mixture prepared in the mixer in an amount 3-5 times greater than the required value, which is 0.0026-0.004% for selenium, for cobalt oxide - 0.00051-0.0008% and for erbium oxide - 0.0064-0.01% by weight of the charge. And at the end of the transition period, these materials in an amount 3-5 times more than the required value are loaded into each 3-5th portion of the mixture being prepared. In the process of the reverse transition to the production of colorless sheet glass with a standard light transmittance, the supply of selenium, cobalt oxide and erbium oxide to the charge is stopped, and as marble, quartz sand and dolomite with a reduced content of iron oxide are consumed, they are replaced with starting materials. In this case, during the first 24-36 hours of the reverse transition, iron oxide is added to each portion of the mixture being prepared in the amount of 0.05-0.113% by weight of the mixture. After that, its supply to each portion of the mixture is reduced to 0.0227-0.0015% and is stopped when marble, quartz sand and dolomite with a reduced content of iron oxide are completely replaced with starting materials.

EFFECT: increasing the accuracy of dosing and mixing of small batch additions and reducing the time for the forward and reverse transition from the production of colorless sheet glass with a standard light transmittance to the production of colorless sheet glass with increased transparency.

1 cl, 1 dwg, 3 ex