Abstract A dust-free granular alkaline earth carbonate material particularly suited for feed stock for glass furnaces and the process for preparing said granular material, wherein the alkaline earth carbonate in freshly prepared aqueous slurry in finely divided form is combined with a solution of alkali silicate sufficient to provide on the basis of solid to solid, about 0.25%, by weight, of silicon dioxide and the slurry is dried and sintered by heating and holding it at a temperature of about 700*-900*C for about one-half hour, thereby converting the solids in the aqueous slurry to a dense material which can be ground to a dust-free, free flowing form giving a high yield of 16 to 140 mesh size suitable for use as a feed stock in glass furnaces.
Inventors
👤 James A Robertson
👤 David W Tunison
👤 Andrew O C Fong
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-31 05:43
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/02; C03C1/028
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
A DUST FREE GRANULAR ALKALINE EARTH METAL CARBONATE SELECTED FROM THE GROUP CONSISTING OF BARIUM AND STRONTIUM CARBONATES, IN PHYSICAL FORM, SUITABLE FOR FEED STOCK IN GLASS FURNACES, THE PRODUCT BEING CHARACTERIZED BY ITS GRAININESS AND PARTICLE HARDNESS AND CAPACITY TO BE HANDLED MECHANICALLY WITHOUT GENERATING FINE DUST, SAID PRODUCT INCLUDING AS AN INTERCRYSTALLINE SINTERING AGENT, DISPERSED THROUGH IT AN ALKALI METAL SILICATE IN AN AMOUNT PROVIDING FROM 0.05 TO 0.50 PERCENT BY WEIGHT OF SILICATE (EXPRESSED AS SILICON DIOXIDE) WHICH IS SINTERED INTO THE TOTAL FINAL COMPOSITION.
Claim 2
Dependent Claim
88 words
A DUST FREE GRANULAR ALKALINE EARTH METAL CARBONATE SELECTED FROM THE GROUP CONSISTING OF BARIUM AND STRONTIUM CARBONATES, IN PHYSICAL FORM, SUITABLE FOR FEED STOCK IN GLASS FURNACES, THE PRODUCT BEING CHARACTERIZED BY ITS GRAININESS AND PARTICLE HARDNESS AND CAPACITY TO BE HANDLED MECHANICALLY WITHOUT GENERATING FINE DUST, SAID PRODUCT INCLUDING AS AN INTERCRYSTALLINE SINTERING AGENT, DISPERSED THROUGH IT AN ALKALI METAL SILICATE IN AN AMOUNT PROVIDING FROM 0.05 TO 0.50 PERCENT BY WEIGHT OF SILICATE (EXPRESSED AS SILICON DIOXIDE) WHICH IS SINTERED INTO THE TOTAL FINAL COMPOSITION.
Claim 3
Dependent Claim
20 words
The product in accordance with claim 1 in which the material is strontium carbonate with about 0.14 percent of SiO2.
Claim 4
Dependent Claim
20 words
The product in accordance with claim 1 in which the material is barium carbonate with about 0.17 percent of SiO2.
Claim 5
Dependent Claim
20 words
The product in accordance with claim 1 in which the material is strontium carbonate with about 0.14-0.50 percent of SiO2.
Claim 6
Dependent Claim
16 words
The product in accordance with claim 1 in which the alkali metal silicate is sodium silicate.