以四川广元金子山所产天然脉石英为主要原材料,经表面擦洗、破碎、磁选、煅烧、水淬、粉磨、酸浸、清洗、过滤及烘干等工艺措施对其除杂处理,制备了SiO2含量〉99.99%的高纯超细SiO2粉体。研究了单一酸、混合酸酸浸处理对Al、Fe主要有害杂质的去除效果,获得了技术可行、经济合理的酸浸工艺路线。所得样品粉体粒径d50约为291nm,Al含量为1.365×10-5,Fe含量为2.36×10-6,达到了电子行业标准对硅微粉技术指标的要求。
The high purity and ultrafine SiO2 powder(the content more than 99.99%) had been prepared after those process measures included surface scrubbing,crushing,magnetic separation,calcinations,water quenching,grinding,acid leaching,washing,filtration,drying and so on,which using natural quartz of Jinzishan in Sichuan Guangyuan as the main raw materials.It was examined that removed effect of a single sour leaching treatment on main detrimental impurity(Al and Fe) by orthogonal test.And then the mix sour leaching processing which is feasible in technology and economy was obtained by experiments.The particle size(d50) of the sample was approximately 291nm by laser particle size analysis.And the test results of ICP-OES show that the Al content is 1.365×10-5 and Fe 2.36×10-6,which reach the technical requirements of electronics industry standard.
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