China's high borosilicate glass production technology h […]
China's high borosilicate glass production technology has a large gap with foreign developed countries. In 1952, domestic crucible furnaces were used to form small-sized high-borosilicate glass chemical equipment by hand. In 1958, a full set of technical equipment was introduced from Germany, and glass-cell furnaces were used to continuously produce high-borosilicate-glass products. The large-scale production of high-borosilicate glass pipes has been introduced in France; since 1980, high-borosilicate glass melting technology has been introduced from Japan's NEG and other companies, and large-scale high-borosilicate glass chemical equipment has been produced using mechanized forming technology using vertical introduction of electric furnaces. At present, the melting process of high borosilicate glass mainly adopts the electric flux gas (oil) method and the all-electric melting method. The simple gas method and the fuel oil method are rarely used because the melting temperature of the glass is too high and the melting rate is too low.
Generally speaking, the production scale of the melting furnace for electric-assisted gas (oil) melting process is relatively large, which can reach tens of tons to hundreds of tons per day, and the melting quality of glass is better; The production scale is relatively small. At present, the domestic is mainly electric melting furnaces with a daily melting capacity of about 10t / d. The vertical pull-down method is mainly used to produce high-borosilicate glass products such as water heaters, heat collection tubes, glass instruments, and glass rods. The production technology is relatively Relatively backward, with low technical level. The scale of all-electric melting furnaces for high-borosilicate glass in developed countries has reached a daily melting capacity of more than 50t / d. The main method is to produce high-borosilicate glass pipes and products by the horizontal pull-down method. The production line has a high level of mechanized automation and advanced production technology. .