ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 33, (2) 105 - 122 (1989)


THE MAIN TECHNOLOGICAL CHARACTERISTICS OF GLASS MELTING ZONES WITH RESPECT TO THE COURSE OF THE MELTING PROCESS - PART III. THE MAIN CHARACTERISTICS HOLDING TILL COMPLETE SAND DISSOLUTION AND REFINING
 
Němec Lubomír 1, Laurentová Simona 2
 
1 Institute of the Chemistry of Glass and Ceramics, Czechoslovak Academy of Sciences, Lípová 5, 120 00 Prague
2 Department of the Technology of Silicates, Institute of Chemical Technology, Suchbátarova 5, 166 28 Prague 6

The study deals with the effect of melting temperature, sand grain size, the type and concentration of the refining agent, the size of the stagnant zone and agitation of the melt by bubbling, on the specific energy consumption and output of a model melting zone in the melting of soda-lime glass. Dissolution of sand and refining were considered as the main melting processes and the theoretical data from Part I [1] were uaed in the calculations. In most instances, sand dissolution was found to be the controlling process, so that the conclusions concerning the advantages of high mean melting temperatures and a small stagnant zone, reached in Part II [2], also hold in the present part. Refining controls the entire melting process only in the case of low or medium melting temperatures, and when melting batch with fine-grained sand at these temperatures. If bubbling with gas is employed, the sand dissolution and refining have to be separated in terms of space; however, even such an arrangement appears to be advantageous.


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