Investigation Of The Preparation Of Alkali-resistant Glass Fiber Using Blast Furnace Slag And Other Industrial Waste

In this paper, the main research objects are blast furnace slag, fly ash and red mud which are composed of SiO₂, CaO, MgO, Al₂O₃, Fe₂O₃ et al oxide, and made a series of silicate glass samples by adjusting the ratio and adding other industrial raw materials of glass fiber. Relevant tests were adopted to analy the changes of the structure and properties of solid waste glasses with corrosion resistance and glass fiber forming performance as the main basis. And then explores the feasibility of the preparation of alkali-resistant glass fiber using those industrial solid waste. we preliminarily designed out the alkali-resistant glass fiber composite with blast furnace slag and red mud as the raw material. The research process and conclusions of this paper are as follows:Firstly,a series of aluminum silicate glasses were prepared by using blast furnace slag and fly ash and industrial raw material. Through the researches of structure, performances and formability of fiber, glass sample with good alkali resistance performance higher than that of ordinary E glass fiber was found, which also has a good fiber formability. Studys found that the polymerization degree of the structure of the solid waste glasses increased along with the network formation（SiO₂） gradually replace of network modification（alkaline earth metal oxide）. Meanwhile, the number of bridge oxygen of [SiO4] tetrahedron increased, glass transition temperature（Tg） increased and the density gradually decline. As network intermediates（Al₂O₃） gradually replace part of the alkaline earth metal oxides, the polymerization degree of the solid waste glass structure increasing, the Tg and the first crystallization peak temperature（Tc） increased and the density gradually decline. In alkali resistance performance, with the increase of SiO₂ replace quantity, the alkali resistant performance of solid waste glasses improved firstly and then decreased. A3 specimen with 56.85wt% SiO₂ content has optimal alkali resistant performance, and the alkali corrosion mass loss of A3 specimens lower 57.3% than that of E fiber glass. Along with the increase of the amount of Al₂O₃ replace, the alkali resistance performance drops gradually.On this basis, this text also studied the influence of the changes of the proportion of iron oxide and Al₂O₃ on the structure and the properties of the solid waste glasses through introducing red mud, meanwhile the feasibility of taking red mud as raw materials of alkali-resisitant glass fiber was explored and obtained iron aluminum silicate fiber glass using the blast furnace slag and red mud as the raw material. The alkali resistant performance of optimal specimen is better than that of ordinary E fiber glass, and fiber forming of this glass is possible. In this study, we found that the change of Fe₂O₃/Al₂O₃ has a little influence on polymerization degree of glass structure of this system. With the increase of this ratio, the polymerization degree is only a slight downward trend after improve firstly, and the density first increases then decreases. From the acid or alkali corrosion test results, it is concluded that the glass sample have the best corrosion resistance when the Fe₂O₃ / Al₂O₃ mole ratio is 1.Finally, ZrO₂ was added in the optimized components of solid waste glasses to improve the alkali resistance, and studied the influence of quantity of ZrO₂ addition on the structure and properties of solid waste glasses, meanwhile found the optimum adding amount. It is concluded that the addition of ZrO₂ have little influence on the polymerization degree of network. The structure density of solid waste glasses increased with the increase of ZrO₂, and the density growth began to slow when the amount of ZrO₂ more than 10 wt %. In the solid waste glass system of this study, the maximum addition of ZrO₂ should be below 15 wt %, the optimum adding amount around 10 wt %, at which the acid or alkali resistant of the samples are as good as market available AR alkali resistant fiber glass. Through glass fiber forming performance testing, it is found that the molding temperature T_lg3 and upper limit temperature of crystallization T_uc raised with the increase of adding amount of Zr O₂, meanwhile the drawing interval ΔT(T_lg3-T_uc) became smaller, and drawing performance degradation. The optimal alkali-resistant samples with the content of Zr O₂ is 10 wt % still meet the requirement of drawing performance, and conform to the requirements of the continuous alkali-resistant glass fiber preparation process. The monofilament control experiment proved that they are able to continuously drawn fiber monofilament which is less than 20 microns in diameter.