One kind of fluorine-free boron-free E-glass fiber and its preparation method

The present invention discloses a fluorine-free boron-free E-glass fibers, characterized by the following parts by weight of the starting material was prepared by melting the drawing: 30 to 35 parts by bubble sand, 10 to 13 parts of kaolin, Ye Lashi 10-20 parts, 20 to 25 parts of lime, and dolomite 5 to 10 parts of the lithium-containing tailings from 8 to 20 parts; the content of lithium oxide, lithium-containing tailings less than 5%; starting material used in the completely fluorine and boron; the fluorine-free boron-free E-glass fibers and an amount of component:? SiO2 58 ~ 60%, CaO? 22 ~ 25%, MgO? 2 ~ 3.5%, Al2O313 ~ 15.0%, Fe2O3? 0.3 ~ 0.45%, R2O? 0.2 to 0.8% and L? i2O? 0.1 to 0.4%; wherein, R2O is Na2O and K2O. The glass fibers with the current formulation E glass fibers compared to conventional applications completely removed most harmful fluorine-containing material, and volatiles are removed completely boron-containing material, and preferably a lithium-containing industrial tailings as a main one of the materials, the melting temperature is lowered, significantly reducing the emissions can be directly produced on a large scale furnaces and oxy-fuel boosting electrical structure.