Making a pelletized glass batch for soda-lime glass manufacture

Details Making a pelletized glass batch for soda-lime glass manufacture Making a pelletized glass batch for soda-lime glass manufacture

1975-11-03

1977-05-31

Bashore, S. Leon

Glass manufacturing

Processes

Repairing or cleaning of apparatus; or batch dust prevention...

65134, 106DIG8, 264117, C03B 516, B01D 4706, C03C 304

Patent

active

040266915

ABSTRACT:
This invention pertains to improvements in the manufacture of soda-lime glass from pelletized glass batch material in which a major portion of the alkali metal oxide flux material (e.g. Na.sub.2 O) in the final glass is derived from an alkali metal hydroxide (e.g. NaOH) and in which the alkali metal hydroxide is reacted with alkaline earth metal oxide source material during the preparation of the pelletized glass batch material. The improvements are obtained by reacting aqueous, concentrated, alkali metal hydroxide with at least a portion of the alkaline earth metal oxide source material (e.g. limestone) to form an aqueous slurry which contains the reaction products, then mixing with the slurry the remaining glass batch materials under conditions to assure thorough mixing and then pelletizing and heating the batch material at a temperature of at least about 145.degree. C to assure substantially complete drying of the pellets and substantially complete reaction of the alkali metal hydroxide.
Pellets thus made produce a more consistent batch material for feeding into a melting vessel in which molten glass is formed. The invention provides not only a more efficient glass making process, but also provides for salvaging heat energy and chemical values from the effluent gases of the melting furnace, thereby abating pollution.

REFERENCES:
patent: 3555133 (1971-01-01), Gentaz
patent: 3728094 (1973-04-01), Bowman
patent: 3753743 (1973-08-01), Kukuda et al.
patent: 3760051 (1973-09-01), Eirich et al.
patent: 3914364 (1975-10-01), Engelleither et al.
patent: 3956446 (1976-05-01), Eirich et al.

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