Investigation Of The Imitative Basalt Fiber Prepared By Red Mud

Red mud is a sort ofpollutantfrom aluminum production,meanwhile our country accounts for a large proportion of aluminum, which means a large quantity of red mud cause different sorts of environmental pollution problems. Thus widening the application area of red mud,and improving the utilization of red mud areurgent.Red mud contains the main components, such as SiO2, Al2O3, Fe2O3, Na2 O.The imitative basalt fiber prepared by mixture of red mud dolomite, pyrophyllite, quartz powder preparation, fluorite, industrial Al2O3. All raw materials are industrial-grade raw material except red mud in this study, so the imitative basalt fibercan be better applied to industrial production.Theimitative basalt fiber is based on the aluminosilicate system, whose main properties arechemical stability, thermal stability, and main components of the samples are within composition of the basalt fiber.First, this study focused on effect of crystallization onthe imitative basalt fiber, finding that iron oxide, TiO2 and other components lead to the samples devitrification, the crystalline phase is magnetite(?-Fe2O3), which results in adverse effect on drawing wire of the basalt fiber. For the properties, main characteristic temperatures of the samples present increasing gradually with the lower degree of crystallization, and water resistance also enhanced gradually. Acid resistance of the samples exhibit the change of enhanced after falling first, but alkali resistance is reduced gradually. In terms of the structure, the sample of the whole degree of the network polymerization increased with decrease of the crystallization, the density is also increasing constantly. Finally choosing sample without crystallization for follow-up study.Nextwe investigatethe effect of iron oxide on preparation of the imitative basalt fiber. Firstly, the glass transition temperature with network former SiO2 replacing iron oxides(FeO, Fe2O3), and the crystallization peak temperature decrease first then increase, but the thermal stability of the sample has obviously improved with the increase of SiO2; The valence of Fe ion changes along with the change of composition of the samples cause the whole water-resistance of the samples improved, and the acid-resistance exhibit floating state due to the particularity of iron oxide, the alkali-resistancealso exhibit irregular change. By the comparison and summary of main properties, comprehensive property of this samples are close or exceed E-glass, AR-glass, acid and alkali resistance of the optimal composition in SF and AF group are better than the homegrown basalt fiber, the density of the component decreases gradually with the increase of Si/Fe ratio.Throughnetwork intermediates Al2O3 replacing iron oxides(FeO, Fe2O3)by reducing the introduction of the red mudgradually, the water-resistance and alkali-resistance improved with the increase of Al/Fe ratio, but the acid-resistance weaken. In terms of the structure, the lower degree of polymerization of glass network with the increase of Al/Fe ratio, resulting in the decrease of bridge oxygen which connects glass network, butdensity of samples exhibit floating state.Finally we investigate the effect of network intermediates onpreparation of the imitative basalt fiber, glass transition temperature and crystallization peak temperature decreases with Al/(Ca + Mg) ratio increase, but melting temperature keeps increasing. Water resistance and alkali resistance of the samplesexhibit first increases and then decreases, butthe alkali resistance keeps increasing, and acid and alkali resistance of the optimal sample is superior to the homegrown basalt fiber obviously. On the structural side, lower overall degree of polymerization of the glass network and decrease of average ionic radius of the samples cause the decrease of density.