酸、热处理对高岭土水行为的影响

表面水和结构水是高岭土中水的两种主要存在形式,它们的行为在很大程度上反映了高岭土的结构和表面状态。本文主要研究高岭土的酸、热处理对其水行为的影响,利用热分析方法测定了不同酸、热处理条件下高岭土的吸水和脱水过程,比较各种处理条件对表面水和结构水的影响。     

两种UHMWPE／Kaolin复合材料在干摩擦条件下的滑动摩擦磨损性能研究

在ＭＭ－２００型磨损试验机上分别对以釜内聚合和熔融机械混合方法制备的高岭土填充超高分子量聚乙烯基复合材料（ＵＨＭＷＰＥ／Ｋａｏｌｉｎ）在干摩擦条件下与４５＾＃钢对摩时的摩擦磨损性能进行了研究,并用扫描电子显微镜和立体光学显微镜对其磨损表面进行了观察与分析,对材料的磨损机理进行了探讨。结果表明：引入适量的高岭土能明显降低ＵＨＭＷＰＥ的摩擦系数和磨损率,用釜内聚合方法制备的ＵＨＭＷＰＥ／Ｋａｏｌｉｎ复     

煤系高岭土及其深加工

介绍了我国煤系高岭土的储量、分布、性质、用途、发展现状和目前煤系高岭土的深加工产品,并指出目前我国开发利用高岭土中的问题及与先进国家的差距。     

X射线荧光光谱法测定催化原料高岭土化学成分的研究

采用LiBO2熔样,X射线荧光光谱仪测定了高岭土的化学组成,结果表明,测定值与化学法及推荐值相符,重复测定高岭土主、次量组分的相对标准偏差小于0.83%,方法简便快捷,分析时间仅为传统湿法化学分析的1/8,应用于高岭土的测定,结果满意。     

准东煤掺烧高岭土对固钠率及灰熔融特性影响研究

选择常见的黏土矿物高岭土作为准东煤添加剂掺烧,研究了不同掺混比例、不同燃烧温度下添加剂的固钠率和煤灰熔融特性的变化,结合XRD谱图和三元相图研究了灰中矿物在高温下的演变过程。结果表明,固钠率随高岭土掺混比例增加逐渐增大,在0~2%时增长较快,2%~5%增长较慢,随燃烧温度升高略微下降;掺混后煤灰熔点随掺混比例先缓慢减小,再快速减小,后快速增加,在3%时达到1 200 ℃左右;XRD和三元相图分析结果表明,煤灰熔融特性变化是由于灰中硅钙石、钙黄长石和钙长石矿物比例的变化引起,发生低温共熔现象是导致掺混比例为3%和4%时煤灰熔点最低的主要原因;当掺混比例为2%时,固钠率在60%以上且灰熔点在1 300 ℃左右,利于固态排渣,当掺混比例为3.0%~4.0%时,灰熔点在1 200 ℃左右,利于液体排渣。     

Removal of methylene blue by two zeolites prepared from naturally occurring Egyptian kaolin as cost effective technique

The optimum condition as well as adsorption behavior of two zeolite types prepared from Egyptian kaolin (namely, zeolite A and zeolite X) with methylene blue (MB) are demonstrated in this study. This will be a step to remove such dyes from textile as well as dying industries.MB removal was investigated using synthetic solutions at initial concentrations 15 mg/L of MB at constant temperature and pH (25 ± 0.1 °C and 7.5 ± 0.2) respectively. The removal efficiency was determined at different contact times and different zeolite doses.The optimum contact times for the removal of MB were 60 min and 75 min for zeolite X and zeolite A, respectively. 0.6 g was the optimum dose for removal of MB with both zeolite types.The batch method has been employed, using MB concentration in solution ranging from 2 to 25 mg/L. The percentage removal and distribution coefficients (K_d) were determined for the adsorption system as a function of sorbate concentration. The isothermal models investigated in this study show that adsorption ratios of MB on both zeolites match to Langmuir and Freundlich equation adding to that every equation constant has been calculated. According to the equilibrium studies, adsorption of zeolite X in higher concentrations is much better than that of zeolite A. Dublin–Kaganer–Radushkevich (DKR) shows physisorption endothermic adsorption process for both zeolites and also linear correlation of Redlich–Peterson and Tekman isothermal models were proved.These results show that zeolites prepared from naturally abundant Egyptian kaolin hold great potential to remove dying materials such as MB from wastewater. This will encourage using such low cost technique in removal of dyes from industrial wastewater.     

高岭土原位无溶剂法合成小粒径ZSM-5分子筛

结合原位水热法和无溶剂法的优点,在不添加有机模板剂和溶剂的基础上,以高岭土为原料通过晶种诱导绿色高效地合成出ZSM-5分子筛。运用X射线衍射、N2吸附-脱附、扫描电镜、透射电镜和NH3程序升温脱附(TPD-NH3)等技术对ZSM-5分子筛进行表征。表征结果与原位水热法合成的ZSM-5分子筛相比,原位无溶剂法合成ZSM-5分子筛的结晶度较高、晶体粒径较小、酸强度略高、孔结构相似。     

A review on synthesis of kaolin-based zeolite and the effect of impurities

Zeolite is extensively synthesized for the application in a large variety of catalysis processes such as ion exchange, hydrocarbon cracking, and organic synthesis. In order to satisfy the serious terms of sustainability that denotes to the reduction of costs and chemical waste, kaolinite-based zeolites were produced from cheap natural resources as against to the conventional process that employs pure sodium silicate and sodium aluminate. This review paper is to highlight the current trends in the synthesis of zeolite. Prior to previous reviews, great concern is focused on the impurities effect on the catalytic performance of kaolinite-based zeolites. This study reveals that the impact of impurities in a catalytic reaction was in fact, underestimated or neglected. For instance, it was found that Fe ion concentration as small as 60 ppm gives significant catalytic output. Hence, a new practice to report the concentration of impurities in the research publication is suggested. This undoubtedly will generate a better interpretation of the catalytic activity from the zeolite framework.     

FeCl3混凝特性的研究

用高岭土作为浊度源，通过一系列实验，对影响其混凝的主要因素pH值、碱度、悬浊液浓度及混凝体系的电荷状态作了分析研究。结果表明，pH值和原水碱度会极大地影响FeCl3的水解产物，进而影响整个混凝反应，高岭土的浊度对混凝反应产生的影响很小。     

高岭土尾砂在高强混凝土中应用的试验研究

利用机械力活化方法,对高岭土尾砂进行了活化研究,采用对比试验,对活化后的高岭土作混凝土掺合料配制C70高强混凝土的力学性能和耐久性进行了研究.结果表明,经过机械力火化后的高岭土的活性与偏高领土相近.高强混凝土中掺入高岭土不仅能满足强度等级要求,而且能提高混凝土的渗透性,具有显著的经济效益与社会效益.