中国超白玻璃用低铁石英砂的矿物材料学特征OA

Low iron quartz sand is a quartz raw material product with huge demand,playing an important role in the photovoltaic industry and used to manufacture ultra-clear glass in China.In this paper,the mineral material science characteristics of low iron quartz sand from different regions of China are systematically studied using inductively coupled plasma optical emission spectrometry(ICP-OES),X-ray diffraction(XRD),scanning electron microscope-energy dispersive spectroscopy(SEM-EDS),and stereoscopy.Using these techniques,we determine the chemical composition,mineral composition,adsorbed water content,particle size distribution,microscopic morphology,pH value,and acid residue of the samples.The results show that:(1)In line with the ultra-clear glass enterprise standard requirements of low iron quartz sand,its mineral composition is primarily quartz,with an adsorbed water content≤6%,particle sizes concentrated to-0.425～+0.106 mm,and we find chemical compositions of w(SiO2)≥99.82%,w(Al2O3)≤0.234%,w(Fe)≤88.659×10-6,w(Ti)≤185.292×10-6,w(Cr)≤0.792×10-6,and w(Ni)≤0.116×10-6.(2)Among mineral sand and sea sand samples,the chemical index of the latter is significantly better.The total amount of trace impurity elements in the sea sand samples is 325.115×10-6,which is significantly lower than that of mineral sand samples(≥401.477×10-6),where the contents of Fe and Ti are the lowest(44.045×10-6 and 31.910×10-6,respectively).(3)Residual chloride ions of pickling sand have obvious adverse effects on the production process and the quality of manufactured ultra-clear glass.As such,the residual acid and chloride ions should be removed,to make the pH value of the product reach a neutral value and adhere to quality testing and technical requirements.(4)According to the quality requirements and actual contents of Fe and Ti in low iron quartz sand,to determine the content of trace impurity elements accurately,it is recommended to use the ICP-OES detection and analysis method with low detection limits.