The basic composition of microbead glass is a sodium borosilicate system.
In order to improve the performance, Al2O3, CaO, MgO, Li2O, TiO2 and other components were introduced into the basic components. Among them, B2O3+R2O is about 30%, which is a high boron sodium glass. Its devitrification temperature is 810-940°C, and the phase separation zone is 680-810°C. The phase separation zone is connected with the crystallization zone and the phase separation speed is faster.
The glass has high boron and sodium content, high temperature viscosity, and low melting temperature of ceramic fiber paper.
Therefore, in the melting process, the following issues need to be solved: (1) Choose the right raw materials to reduce the gas content in the glass. (2) Determine a reasonable furnace structure and melting process to solve the problem of boron volatilization and glass clarification. (3) Determine the appropriate molding process to avoid glass phase separation. (4) Huaneng Rock Wool Board selects appropriate refractory materials to reduce high temperature erosion.
Since the microbeads are formed using a secondary process, the beads used for the production of beads must first be made into a certain size of pellets.
The choice of raw materials is due to the low temperature viscosity of the glass and its low melting temperature. Therefore, although there are a large number of refractory components such as SiO2, Al2O3, and TiO2 in the glass component, the raw material selection is not difficult, and pure oxides such as quartz sand, industrial alumina, and Titanium Dioxide can be directly used.
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