The Study Of Cerium's Fining And Decolorization Of Glass

In this topic, the application and development of finging agent and decolorization agent of glass are introduced. Rare earth composite addition had important significance for glass.The topic of this paper was about fining and decolorization of Na2O-CaO-SiO₂ flat Glass. Little Na₂SO₄, CeO₂, Ce₂(CO₃)₃, were chosen as addition .The optimal kind of addition and content were determined by comparison with the fining and decolorization effects. The study suggested that using single fining agent couldn't satisfy the fining require of Na2O-CaO-SiO₂ flat Glass. When Ce₂(CO₃)₃ or CeO₂ was compounded with Na₂SO₄ used as addition, the fining and decolorization effect, apparent quality and transmissivity could be greatly improved. This was because Ce₂(CO₃)₃ or CeO₂ was mainly used to eliminate fineseeds and having glass decolored, while the function of Na₂SO₄ was to remove bubbles.Comparative results indicate that Na₂SO₄-Ce₂(CO₃)₃ compound agent is better than Na₂SO₄-CeO₂ compound agent on the effect of fining and decolorizat-ion ,Which is mainly because CO₂ chang the atmosphere of stoves.There were synergistic effect on Na₂SO₄ and Ce₂(CO₃)₃, which depends on the content of Na₂SO₄, and the best point is 2.5%.In this essay, effects of kinds of addition on comprehension properties such as density, visible light transmittance and UV transmittance were furtherly researched. Addition had less influence on density. But they had obviouse effet on visible light transmittance and UV transmittance of glass.