高岭土碱法活化合成P型沸石及其对水中钾离子的吸附

Synthesis of P-Zeolite from Alkli-activated Kaolinite and Its Adsoption to K^+

为降低开发制备P型沸石新工艺的能耗,进行了氢氧化钠碱熔活化高岭土合成P型沸石的研究,分析了活化反应的机理,确定高岭土碱熔活化的适宜条件为:高岭土与氢氧化钠按质量比1:0.94在400℃焙烧碱熔反应2h,活化物料用水玻璃和水调整摩尔配比为Al2O3:SiO2:NaO:H2O=1:3.2:3.7:220,得到的P型沸石料液体系在80℃下老化反应3h,然后加少量4A沸石作晶种在95℃晶化30h,可合成性能良好的P型沸石.以P型沸石作吸附剂对水中K+的吸附实验表明,其对模拟海水的K+吸附量为10.5mg/g.

In order to reduce energy cost in developing new technology of P-zeolite synthesis from kaolinite, the synthesis of P-zeolite from alkli-activated kaolinite was carried out and the activative reaction mechanism was also analyzed. The suitable conditions of activative reaction were that the mixture of kaolinite and sodium hydroxide with mass ratio 1：0.94 was calcined at 400 ℃ for 2 h. Adding water glass and water to the alkli-activated kaolinite, the suitable composition solution of P-zeolite synthesis was obtained. The mixed compound with molar ratio of Al2O3：SiO2：Na2O：H2O=1：3.2：3.7：220 was fwstly aged at 80℃ for 3 h, secondly crystallized with 4A-zeolite as seed at 95 ℃ for 30 h, and the P-zeolite was obtained. The experimental result of adsorption ofK^＋ on P-zeolite showed that K^＋ ion exchange capability for simulated seawater was 10.5 mg/g.