高岭土凝胶及氧化硅的制备与光谱性质研究

Study on Preparation and Spectroscopy of Silica-Alumina Hydrogel and Silica from Kaolin

高岭土经氢氧化钠活化后与盐酸反应制备了硅铝酸盐凝胶,所得硅铝酸盐凝胶经过干燥与酸化处理得到氧化硅.利用红外光谱(IR)、X射线衍射(XRD)和X荧光光谱(XRF)对所得硅铝酸盐凝胶及氧化硅进行了表征研究,探索了高岭土制备硅铝酸盐凝胶的最佳条件.结果表明,高岭土矿为40 g时制备硅铝酸盐凝胶和氧化硅的最佳条件为:氢氧化钠用量15～20 g、盐酸浓度4～5 mol·L;IR,XRD及XRF表征结果显示,最终产物具有氧化硅的结构且其纯度较好.

In our research, silica-alumina hydrogel was prepared by activation with NaOH and reaction with HCl from kaolin, and silica was obtained from the hydrogel by drying and acidifying with HC1. IR, XRD and XRF were used for testing the results, and better result was obtained. The optimal conditions of processing for kaolin 40 g were 15-20 g of sodium hydroxide and 4-5 mol·L^-1 of hydrochloric acid. Finally, preparation processing to get silica, as well as the structure and purity of the resulting silica were characterized by means of IR, XRD and XRF.