中国超白玻璃用低铁石英砂的矿物材料学特征

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Abstract： Low iron quartz sand is aquartz raw material product with huge demand，playing an important role in the photovoltaic industryand used to manufactureultra-clear glassin China.In this paper，the mineral material science characteristics of low iron quartz sand from different regions of China are systematically studied using inductively coupledplasma 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，adsorbedwatercontent，particle sizedistribution，microscopic morphology， pH value，and acid residue of the samples.The results show that： （1） In line with the ultra-clear glass enterprise standardrequirementsoflowironquartzsand，itsmineralcompositionis primarilyquartz，withanadsorbed water content ⩽6% ，particle sizes concentrated to -0.425～+0.106mm ，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 later 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 efects 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 Feand Ti in low iron quartz sand， to determine thecontent of trace impurityelementsaccurately，it is recommended to use the ICP-OES detection and analysis method with low detection limits.

Key words： low iron quartz sand；quartz；quartz raw materials；ultra-clear glass；photovoltaic glass

超白玻璃是以低铁石英砂为主要原料制备的一种低铁、高透明度的硅酸盐玻璃。（剩余17585字）