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

Ceramics-Silikáty 35, (3) 225 - 234 (1991)


THE CHEMICAL, PHASE AND ENTHALPY BALANCE OF CHANGES IN THE PRE -HEATED BATCH FOR THE EUTAL GLASS - PART II. DETERMINATION OF PHASE AND ENTHALPY CHANGES
 
Eliášová Mária 1, Košecký Milan 2, Rekeňová Mária 1, Proks Ivo 1,
 
1 Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská 5, 842 36 Bratislava, Czechoslovakia
2 Institute of Glass Research and Development, SNP street 20, 912 50 Trenčín, Czechoslovakia

A quantitative description of chemical processes and. enthalpy changes in the pressed Eutal glass batch of 3- 4 % initial humidity that was heated in the stream of natural gas combustion products in the range of (25 °C 800 °C) is presented in this paper. During heating water is released from H₃BO₃ and kaolin and. approximately 67 % of CO₂ escape from dolomite and calcite by thermal decomposition. Interaction among components gradually generates calcium borates (primarily CaO . B₂O₃, 2 CaO . 3 B₂O₃ , 2 CaO . B₂O₃), aluminium borates (9 Al₂O₃ . 2 B₂O₃, 2 Al₂O₃ . B₂O₃), 2 MgO . B₂O₃ . CaO . 2 Al₂O₃, MgO, CaO, etc. Transition of B₂O₃ to the bound state (at 800 °C free B₂O₃ is not present in the batch) decreases B₂O₃ leakage from the batch that is caused by reactive escaping in water steam. A total heat consumption for heating the batch and. For reaction in it was estimated as Δh (<25 °C, 800 °C>) = 1630 - 1670 kJ/kg.


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