高岭土制助洗剂—4A沸石的研究

研究了由山东文登市某高岭土矿制备４Ａ沸石的最佳方法和工艺条件。     

高岭土法制氟化铝新工艺研究

为了充分利用高岭土资源,在比较国内外氟化铝生产方法优缺点的基础上,研究开发成功了高岭土法制氟化铝新工艺。文中介绍了该工艺原理、工艺流程、工艺条件及工艺特点。     

高岭土干细磨过程机械力化学变化的检测

本文研究了高岭土干细磨过程中发生的机械力化学变化。采用粒度分析、SEM、XRD、IR、DTA和DTG、反气相色谱（IGC）以及BET多层吸附等测试方法对干细磨高岭土进行分析测定。结合高岭石晶体结构特点，从机械力化学角度阐述了在高岭土干细磨过程中发生的晶格无序化、脱羟基反应、表面性质变化及团聚作用的机理。     

高岭土分散与高浓泥浆液化的研究

本文应用材料物理化学原理,研究了高岭土深加工的分散条件及高浓泥浆液化。结果表明,采用Disp-1分散剂可以在中性条件下进行有效分散,并实现高岭土的高浓泥浆液化。     

东宫下村高岭土矿开采后生态环境预测与治理对策

本文对龙岩布东宫下村高岭土矿开采后,植被和生态坏境可能遭到的破坏程度进行预测。在此基础上,提出恢复生态平衡的四条措施以及工程施工的四点建议,为维持该矿区的生态平衡提供有关的科学根据。     

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.     

Efficient Method for the Synthesis of Michael Adducts Using Kaolin Preloaded with KOH

Michael addition of various active methylene compounds to β-nitrostyrenes is efficiently catalyzed by using Kaolin preloaded with KOH in acetonitrile at room temperature with moderate to good yields.     

羟甲基化三聚氰胺改性PAM絮凝剂的絮凝沉降性能研究

以非离子型聚丙烯酰胺(PAM)、三聚氰胺和甲醛为原料,在水相中合成出羟甲基化三聚氰胺改性聚丙烯酰胺阳离子絮凝剂.对该絮凝剂固体样品进行红外表征,在1100和1582 cm-1处分别出现了仲胺C-N伸缩振动峰和亚胺N-H的弯曲振动峰,说明聚丙烯酰胺和三聚氰胺之间通过曼尼希(M ann ich)反应形成了新的聚合物.在室温25℃、pH=1情况下,用其处理模拟废水(2 g/L高岭土悬浊液),絮凝剂投加量为5.66 mg/L时,浊度去除率可达99.80%.     

Determination of Structural Water Content in Clayey Materials

Water may be present in clayey materials in different forms (hydration water and structural water), providing different properties to the materials such as reactivity and plasticity, and affecting the industrial processes in which they are involved, resulting in the importance of the determination these types of water. In addition, some clayey materials such as bentonites or sepiolites, present very high avidity for water, which must be considered in the characterization of the materials, and especially in the structural water content determination. In the literature, no rapid and accurate methods for the determination of structural water content in this type of clayey materials are described and validated, so to fill the lack of a methodology for determining structural water, a method by combustion and infrared detection has been established. In the development of the methodology, the sample preparation was the most important step, in which the drying process of the samples had particular relevance. The time and temperature of drying and the maximum time that the samples can be stored in the desiccator before the analysis were evaluated. The development of the measurement method was performed optimizing the conditions and constructing calibration curves. The developed methodology was validated using reference materials. Finally, several clayey materials (sepiolites, bentonites, and kaolin) were analyzed using the developed methodology. The results were compared with those obtained by differential thermal analysis-thermogravimetry (DTA-TG), concluding that the DTA-TG analysis is only useful for the determination of structural water when the materials do not contain carbonates (e.g., calcite, dolomite).     

Heat of hydration of high reactive pozzolans in blended cements: Isothermal conduction calorimetry

A study was carried out comparing silica fume (SF) and dealuminated kaolin (DK) as pozzolanic materials in blended cements. Ten, 20 or 30 wt% of SF or DK were substituted for Portland cement. The kinetics of hydration up to 45 h were studied using isothermal conduction calorimetry. Blends containing pozzolanic materials usually have decreased heats of hydration compared to pure cement during the period of C₃S hydration, i.e. during the main hydration peak. Depending on the chemical composition and the activity of the pozzolan, the reaction taking place with the lime typically contributes to the heat output after the main hydration peak.The pozzolanic activity of DK is the principal factor and heat evolution increases with respect to pure PC mortar, during the first 15 h. The presence of hydrated silica (silanol groups) in DK increases the pozzolanic activity especially before and during induction period. The acidic silanol sites are capable of a fast acid-base reaction with the alkalis and with any Ca(OH)₂ present in cement during the induction period.