高岭土伴生型石英分粒级制备光伏玻璃用石英砂

Preparation of Quartz Sand for Solar Photovoltaic Glass from Quartz Associated Kaolin by Size Fraction Distribution

这是一篇陶瓷及复合材料领域的论文。为助力碳中和、碳达峰目标,我国光伏玻璃需求量近年来快速增长,从而使光伏玻璃用低铁石英砂(ωFe_(2)O_(3)≤0.010%)供应趋紧,因此高岭土伴生型石英制备低铁石英砂备受关注。高岭土伴生型石英通常可在高岭土物理选矿的尾矿中富集,以广西合浦某高岭土物理选矿尾矿为实验对象,研究了分粒级选矿提纯对高岭土伴生型石英制备低铁石英砂的影响规律。结果表明,高岭土伴生型石英矿中+2mm粒级的SiO_(2)、Al_(2)O_(3)、Fe_(2)O_(3)含量优于0.71~2mm、0.125~0.71mm粒级相应指标;采用磨矿-分级-磁选-浮选的分粒级选矿提纯工艺,不同粒级所得浮选石英精砂的Fe_(2)O_(3)含量均不低于0.016%;对+2 mm粒级浮选精砂分别采用硫酸、草酸与氢氟酸、草酸为酸浸介质所得石英精砂的Fe_(2)O_(3)含量分别降至0.0091%、0.0054%,满足光伏玻璃、光学玻璃用低铁石英砂的Fe_(2)O_(3)含量要求。

This is an essay in the field of ceramics and composites.To achieve carbon neutrality and peaking carbon dioxide emissions,the low-iron quartz sand(ωFe_(2)O_(3)≤0.010%)supply for photovoltaic glass is tightening in China,so the preparation of low-iron quartz sand from quartz associated with kaolin gradually attracting widespread attention.However,quartz associated with kaolin can usually be enriched in the tailings of kaolin physical beneficiation.Taking quartz associated kaolin which is from tailings of kaolin physical beneficiation in Hepu,Guangxi as the object,the effect of purification by size fraction distribution on the preparation of low iron quartz sand from quartz-associated kaolin was studied in this essay.The experimental results showed that the index of SiO_(2),Al_(2)O_(3)and Fe_(2)O_(3)content in size of 2 mm or more was better than that of 0.71~2 mm and 0.125~0.71 mm respectively,but for all different size fraction products,ferric oxide content of quartz sand is not less than 0.016%by grinding,hydraulic classification,magnetic separation and flotation.The content of quartz sand obtained by sulfuric acid and oxalic acid was 0.0091%,and the content of quartz sand obtained by hydrofluoric acid and oxalic acid was 0.0054%respectively,both of which meets the ferric oxide content requirement of low iron quartz sand for solar photovoltaic glass and optical glass.