A kind of fluorine-free, boron-free and alkali-free glass fiber and preparation method thereof

Abstract

The invention discloses a fluorine-free, boron-free and alkali-free glass fiber, which is characterized in that it is prepared by melting and drawing the following raw materials in parts by weight: 30-35 parts of bubble sand, 10-13 parts of kaolin, and 10-20 parts of pyrophyllite 20-25 parts of lime, 5-10 parts of dolomite and 8-20 parts of lithium-containing tailings; the content of lithium oxide in the lithium-containing tailings is less than 5%; the raw materials used do not contain fluorine and boron at all; The composition and content of the fluorine-free, boron-free and alkali-free glass fiber are: SiO2? 58-60%, CaO? 22~25%, MgO? 2~3.5%, Al2O313~15.0%, Fe2O3? 0.3~0.45%, R2O? 0.2~0.8% and L? i2O? 0.1~0.4%; Among them, R2O is Na2O and K2O. Compared with the currently traditionally used E glass fiber, this glass fiber formula completely removes the most harmful fluorine-containing raw materials, and completely removes the volatile boron-containing raw materials, and optimizes an industrial lithium-containing tailings as the main One of the raw materials, the melting temperature is lowered, the exhaust gas emission is greatly reduced, and it can be directly mass-produced in a pool kiln with pure oxygen combustion and electric boosting structure.

Description

technical field [0001] The invention relates to a production formula of alkali-free glass fiber, in particular to a fluorine-free, boron-free alkali-free glass fiber with less harmful gas emission and an environment-friendly preparation method thereof. Background technique [0002] At present, the traditional alkali-free glass fiber formulations contain about 1% F 2 and 6~8% boron oxide; when melting alkali-free glass, due to F 2 with SiO 2 Combined with being extremely volatile, more than 50% of the fluoride will volatilize with the flue gas during the melting process. The treatment of fluorine-containing waste gas requires a lot of manpower and material resources. Waste gas treatment has caused a heavy economic burden to the glass fiber industry. Improper treatment and discharge into the atmosphere will cause serious consequences and endanger the health of the public. Simultaneously, boron compound is also a kind of volatile and expensive component. If its volatile matt...

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Problems solved by technology

[0002] At present, the traditional alkali-free glass fiber formulations contain about 1% F 2 and 6~8% boron oxide; when melting alkali-free glass, due to F 2 with SiO 2 Combined with being extremely volatile, more than 50% of the fluoride will volatilize with the flue gas during the melting process. The treatment of fluorine-containing waste gas requires a lot of manpower and material resources. Waste gas treatment has caused a heavy economic burden to the glass fiber industry. Improper treatment and discharge into the atmosphere will cause serious consequences and endanger the health of the public

At the same time, boron compound is also a volatile and expensive component. If it is not handled properly, its volatiles will be discharged into the atmosphere, which will also cause damage to plants and humans, and the preparation cost is high, and the glass fiber performance of the obtained product is low.

[0003] The patent with the application number 200910231248.8 discloses a fluorine-free, low-boron, alkali-free glass fiber formula and preparation method. Although the fluorine-containing raw materials are completely removed from the formula, it still contains boron, a volatile component, which will also cause air pollution, and The resulting product has low glass fiber properties

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