NEW MOLTEN REFRACTORY PRODUCTS FOR GLASS FURNACES

Journal Article · Sun Jan 01 04:00:00 EST 1961 · Ogneupory (U.S.S.R.) For English translation see Refractories (USSR) (Engl. Transl.)

OSTI ID:4775391

Meloyan, S S.S.

The production and development of molten refractory products is described with special emphasis on alumina, kaolin, and zirconic concentrates as charge components. The refractory materials are called baddeleyite corundum or Bakor in short, as their crystalline phases represepent baddeleyite (ZrO/sub 2/) and corundum ( alpha -Al/sub 2/O/sub 3/). The service life of Bakor in glass furnaces is 20--30 months at 14880-1500 deg C. Experiments were made for the production of Bakor-33, which contains about 33% ZrO/sub 2/, 50% Al/sub 2/O/sub 3/ , and 12--13% SiO/sub 2/. Industrial alumina, zircon free from iron, and industrial zirconium dioxide were used as charge components. Additions: marble dust and calcined soda. Bakor-33 is molten at 1900--2000 deg C and cast at 1800- 1820 deg C. Heat treatment takes 8--10 days. Its specific gravity is 3.6--3.7 g/ cm/sup 3/, the weight of unit volume 3.3-3.6 g/cm/sup 3/, the maximum apparent porosity 3%, and the softening point at 2 kg/cm/sup 2/ lies at 1740 deg C. Analysis: 13.72% SiO/sub 2/; 49.78% Al/sub 2/O/sub 3/; 0.71% FeO/sub 3/; 0.84% CaO; 0.11% TiO/sub 2/; 1.92% alkalies; 32.92% ZrO/sub 2/. By using Bakor-33 the glass melting temperature can be increased from 1450 to 1600 deg C and the service life of the glass furnaces to 36--48 months. Main sources of scrap (40%) are cracks, large shrinkage cavities, and convexity of lateral faces, which is mainly caused by the imperfection of the production process. (OTS)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-16-032131
• OSTI ID: 4775391
• Journal Information: Ogneupory (U.S.S.R.) For English translation see Refractories (USSR) (Engl. Transl.), Journal Name: Ogneupory (U.S.S.R.) For English translation see Refractories (USSR) (Engl. Transl.) Vol. Vol: No. 12; ISSN OGNPA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALKALI METALS
ALUMINUM OXIDES
ALUMINUM SILICATES
BADDELEYITE
CALCIUM CARBONATES
CALCIUM OXIDES
CASTING
CLAYS
CONFIGURATION
CORUNDUM
CRACKS
CRYSTALS
DEFORMATION
DUSTS
FURNACES
FUSED SALTS
GLASS
HEAT TREATMENTS
HIGH TEMPERATURE
IRON OXIDES
KAOLIN
LIMESTONE
MATERIALS TESTING
MELTING
MELTING POINTS
METALS, CERAMICS, AND OTHER MATERIALS
MINERALS
OXIDES
PHASE DIAGRAMS
PLANNING
POROSITY
PRODUCTION
PYROLYSIS
REFRACTORIES
RESIDUES
SHRINKAGE
SILICON OXIDES
SODIUM CARBONATES
SURFACES
TITANIUM OXIDES
VOLUME
WEIGHT
ZIRCONIUM ALLOYS
ZIRCONIUM OXIDES