矿物原料对SiO_2-Al_2O_3-MgO玻璃熔制的影响研究

目前SiO_2-Al_2O_3-MgO系统的S级高强玻璃纤维生产主要以石英砂、氧化铝、重质氧化镁等化工级原料分别引入玻璃组分中的各氧化物实现。这些化工原料纯度高,有助于提高产品成分和性能的稳定性,但这些原料在熔制过程中需要更高的熔制温度,具有能耗大、玻璃液的澄清及均化困难等缺点。为改善SiO_2-Al_2O_3-MgO系统S级高强玻璃的熔制工艺性能,开展了在玻璃原料中引入高岭土、滑石粉的熔制实验,研究矿物原料对高强玻璃熔制的影响规律。通过DSC分析了玻璃的特征温度点,利用XRD表征了熔制过程中配合料的物相变化情况,并在快速升温炉中进行了配合料的熔制实验观测,同时进行了新生态玻璃纤维的强度测试。研究表明:采用矿物原料能显著降低配合料的熔制温度,降低熔制能耗,改善特种玻璃熔制的工艺性能,形成玻璃的温度降低50℃以上;同时也发现矿物原料中的Fe~(2+)含量较大,增加了玻璃液的温度梯度,玻璃液表面温度低,不利于玻璃液的澄清,因此需要采取措施降低矿物原料中Fe~(2+)的含量,以改善玻璃液的澄清效果,避免玻璃纤维的性能受到影响。

THE INFLUENCE OF RAW MINERAL MATERIALS FOR SiO2-Al2O3-MgO SYSTEM GLASS

Silica sand,aluminium oxide and magnesium oxide have always been selected as main raw materials for the production of S high-strength fiber glass in the SiO2-Al2O3-MgO system.The high purity of these chemicals helps to improve the stability of product composition and performance,which bring highly energy-consuming,require higher temperature and have difficulties in glass melt clarification and homogenizing meanwhile.To improve the melting process performance of SiO2-Al2O3-MgO system S-glass,the influence of kaolin and talc in S-glass melting is studied in this paper.The characteristic temperature of glass is analyzed by DSC,the phase transformation in the batch melting process is characterized by XRD.The batch melting experiment has been carried out in a muffle furnace,and the strength test of the new born glass fiber was carried out.Studies have shown that use of the batch of kaolin and talc can significantly lower the melting temperature about 50 ℃,reduce energy consumption and improve the system of S-glass melting process performance.Also it is found that minerals of Fe2+ content in raw materials is larger,which increase the temperature gradient in glass melt and is not conducive to glass clarification.So,in order to improve the glass clarification and avoid the glass fiber performance affected,measures should be taken to reduce the content of Fe2+ in S-glass batch melting.