Investigation Of Self-adhesive In Glass Batch Briquetting

Granulated glass batch is one of the measures of energy saving in glass industry, andthe constraints is the selection of the binder material. In this paper, the replacement ofcalcium carbonate, magnesium carbonate by calcium oxide, magnesium oxide, and theaddition of broken glass have been investigated for the feasibility. The aim is to achievethe self-adhesive effect through hydration reaction. The influencing factors and variationrule in the granulation processhave been studied and the melting properties has beenanalyzed.The batch ingredients were calculated according to the float glass ingredients.Thebatch with different moisture content, different contents and particle size of broken glasswere briquetted. And the compressive strength under different curing conditions has beenanalyzed by the universal press machine. The melting properties of briquetting have beeninvestigated by XRD, DSC, high temperature microscopy analyzer, SEM and otherequipment. The results show that, the addition of calcium oxide, magnesium oxide andbroken glass can induce the self-adhesive effect and the melting rate of the glass batch hasbeen improved to some extent, while the melting temperature has been reduced.After the environmental conservation for14days with the moisture content of12%,temperature of25℃and humidity of30%, the compressive strength of the briquettingwith calcium oxide and magnesium oxide can reach12.24MPa. With the increase ofconservation time, the briquetting becomes harder gradually due to the appearance ofCaCO3, Ca2SiO4. After the granulated, the termination temperature of thermaldecomposition of the glass batch is984.1℃,and the thermal decomposition energyconsumption is219.15J/g. Compareed with the traditional loose batch, the thermaldecomposition termination temperature shifts25.7℃to the lower temperature and theenergy consumption reduces60.59J/g. The vitrification at900℃is74.72%, which is20.94%higher than that of the traditional loose batch. The number of bubbles during themelting process is reduced also.After the environmental conservation for7days with the moisture content of12%,temperature of25℃and humidity of30%, the compressive strength of the briquettings with the broken glass can reach35.61MPa when the content of broken glass is30%andthe particle size10μm. With the increase of conservation time, some substances such asNaAlSi2O6·3H2O appreas which can increase the strength. After granulated, the thermaldecomposition termination temperature of glass batch is917.3℃, and the thermaldecomposition energy consumption is197.3J/g. Compareed with the traditional loosebatch, the thermal decomposition termination temperature shifts95.2℃to the lowertemperature while the energy consumption reduces82.44J/g. The vitrification at900℃is60.92%, which is7.14%higher than that of the traditional loose batch. The number ofbubbles during the melting process is reduced also.