Alkali-free glass and manufacturing technique thereof

Abstract

The invention relates to alkali-free glass for the production of continuous glass fiber product and production process thereof, pertaining to inorganic non-metallic material field. The main production raw materials of the alkali-free glass comprise quartz sand, limestone, pyrophyllite and dolomite; wherein, the production processes comprise proportioning, melting, fiber forming, fiber drawing and product processing; the temperature for fiber forming is 1160-1360 DEG C, the viscosity is 1000 poises and liquid phase temperature is at least 97 DEG C lower than that of the fiber forming; the weight proportions of compositions to the product are respectively that: silicon dioxide is 58-62 percent, calcium oxide 20-24 percent, aluminum oxide 12-14 percent, magnesium oxide 2-4 percent, fluorine 0-0.6 percent, potassium oxide and sodium oxide 0-2 percent in total, titanium oxide 0-2 percent, iron trioxide 0-0.6%, sulfur trioxide 0-0.6% and micro impurity 1%. By adjusting the variety and proportion thereof of glass raw materials, the invention removes fluoride materials such as fluorite and boride such as borocalcite from raw materials of glass, thereby controlling the origin of the waster gas pollutants.

Description

Technical field: [0001] The invention relates to an alkali-free glass used for producing continuous glass fiber products and a production process thereof, belonging to the field of inorganic non-metallic materials. Background technique: [0002] A common glass composition used to produce continuous glass fibers is alkali-free glass, which is the most common glass used to produce electronic-grade and reinforced glass fibers. The main advantage of alkali-free glass is that it uses fluoride and boride as flux, which can be melted and clarified at a relatively low temperature. However, boron and fluorine are volatile components in the glass melting process, and are the main part of the volatiles in the glass melting operation, forming a relatively large amount of exhaust gas pollutants. Therefore, it is necessary to build high-efficiency waste gas treatment facilities to ensure that the discharged waste gas meets the environmental protection requirements stipulated by the state...

AI Technical Summary

Problems solved by technology

However, boron and fluorine are volatile components in the glass melting process, and are the main part of the volatiles in the glass melting operation, forming a large amount of exhaust gas pollutants

Therefore, it is necessary to build high-efficiency waste gas treatment facilities to ensure that the discharged waste gas meets the environmental protection requirements stipulated by the state, thereby increasing production costs and easily causing secondary pollution of solid waste

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