Foaming of E-Glass II (Report for G Plus Project for PPG)

Kim, Dong-Sang ; Portch, Matthew P. ; Matyas, Josef ; Hrma, Pavel R. ; Pilon, Laurent

Pacific Northwest National Laboratory (U.S.)

关键词: Limestone;    Radioactive Waste Processing E-Glass;    Sulfates;    Foam;    Chemical Composition;   

DOI  :  10.2172/973457
RP-ID  :  PNNL-15394
RP-ID  :  AC05-76RL01830
RP-ID  :  973457

美国|英语

来源: UNT Digital Library

【 摘 要 】

In a previous study, the effect of the furnace atmosphere on E glass foaming was investigated with the specific goal to understand the impact of increased water content on foaming in oxy-fired furnaces. The present study extended the previous study and focused on the effect of glass batch chemical composition on E-glass foaming. The present study also included reruns of foam tests performed in a previous study, which resulted in the same trend: the foaming extent increased nearly linearly with the heating rate and no foam was produced when CO2 + 55% H2O atmosphere was introduced at 300°C. It was shown that the lack of foaming in the test with CO2 + 55% H2O atmosphere introduced at 300°C was caused by a loss of sulfate at T <1250°C because of higher water content at the early stages of melting. The tests with new batches in the present study showed that replacing quicklime with limestone tend to decrease foaming, possibly caused by increased sulfate loss during early stages of melting in the batch with limestone. The batches where Na2SO4 was replaced with NaNO3, NaNO3 + CeO2, or CeO2, produced only very limited foaming regardless of the replacing components. As expected, the foaming extent increased as the sulfate content in the batch increased. The results of the present study suggest that foaming can be reduced by using limestone over quicklime and by decreasing the sulfate addition to a minimum required for refining.