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化工进展  2015 

酸浸工艺脱除微硅粉杂质离子及其对热碱溶解过程的强化

DOI: 10.16085/j.issn.1000-6613.2015.12.041

Keywords: 废物处理,二氧化硅,浸取,溶解

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Abstract:

针对热碱溶解微硅粉制备水玻璃的过程中存在Si转化率较低的问题,提出了采用酸浸预处理的方法脱除微硅粉中的金属杂质,强化其热碱溶出过程,以提高Si的转化率。本研究通过采用X射线荧光仪(XRF)、冷场发射扫描电子显微镜与能谱分析仪(SEM-EDS)、X射线衍射仪(XRD)以及滴定分析检测方法,研究了酸种类、酸浓度、反应温度、固液比、反应时间对金属杂质浸出率的影响和酸浸工艺对微硅粉热碱溶出过程的强化作用,得出适宜的酸浸条件HCl浓度2mol/L、反应温度60℃、固液比1(6～8)、反应时间40～60min。在碱溶出过程初期,酸浸处理后的微硅粉中SiO2的溶出率由46.62%增至61.91%,得到了显著提高。结果表明酸浸预处理对微硅粉的碱溶过程起到很好的强化作用,提高了Si的转化率,这将在增大微硅粉利用率的同时也有利于满足工业水玻璃[Na2O·(2.5～3)SiO2]对模数的要求。

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