摘要
研究了用高岭土制备Ａ型沸石及有关工艺过程，得出了最佳工艺条件，并对产品进行了Ｘ射线衍射及电镜扫描的测定。制备出对钙离子吸附能力高的Ａ型沸石，研究了其对溶液中Ｃａ２＋离子的吸附机理，讨论了温度和溶液浓度变化对Ａ型沸石吸附Ｃａ２＋离子动力学的影响。实验结果表明：Ａ型沸石对Ｃａ２＋的吸附可分为两个阶段：在反应的初期（ｔ≤１０ｍｉｎ），反应进行非常之快，影响因素复杂，动力学方程呈曲线关系；在反应的后期（ｔ＞１０ｍｉｎ），满足方程ｄＣ／ｄｔ＝－ｋ·Ｃ。经过计算，得出该吸附反应的活化能Ｅ＝１７．０７ｋＪ／ｍｏｌ，吸附频率因子Ａ＝２０２．４ｓ－１。
The process of using kaolinite from Leiyang county, Hunan Province to prepare zeolite A was reported. The best technical condition for preparing zeolite A has been obtained. The X ray diffraction analysis and scanning electron microscope observation of the product were carried out. The kinetics of zeolite A adsorbing Ca 2+ in aqueous solution was described,and the influences of temperature and the original concentration of Ca 2+ were emphatically studied. The results showed that there are two stages in this adsorption reaction. In the first stage ( t ≤10min), the reaction is very quick and the kinetics relation is complex; in the second stage ( t >10 min), the reaction becomes slow, which accords with the equation of ln C =- kt+b . The relationship between the adsorption velocity constant and the temperature in the later stage accords with the Arrhenius equation; the activation energy E =17.07 kJ/mol, and the adsorption frequency factor A =202.4 s -1 .
出处
《中国有色金属学报》
EI
CAS
CSCD
1996年第3期39-42,共4页
The Chinese Journal of Nonferrous Metals
关键词
A型沸石
制备
钙离子
吸附
无机材料
zeolite A preparation calcium ion adsorption mechanism
