超声波条件下膨润土合成4A沸石

在低温条件下,膨润土在超声波下快速合成了4A沸石,分别用粒度、XRD、SEM等进行了表征.结果表明,膨润土在超声波下合成4A沸石的速度是膨润土酸化法的4倍,合成产物的白度为95%,钙离子交换量为328 mg/g4A沸石,平均粒径为460 nm.     

猫砂的研究与应用进展

近年来,猫砂作为一种宠物用品,为室内养宠物的家庭带来了便利,市场上猫砂种类繁多,对于猫砂的研究创新也在不断深入。本文从猫砂的背景、种类及特点、性能及品质改良等几个方面,对猫砂相关的研究进行整体性的阐述,以期为猫砂的性能提升发展研究提供参考。     

改性沸石和膨润土对氟离子吸附性能研究

选用高温焙烧、硫酸、硫酸镁改性天然沸石和膨润土,考察了3种改性方法对沸石和膨润土吸附氟离子性能的影响。实验结果表明,高温焙烧、硫酸改性和硫酸镁改性均提高了沸石和膨润土对氟离子的吸附能力。改性沸石对氟离子的吸附符合Langmuir等温吸附模型;硫酸改性、硫酸镁改性膨润土对氟离子的吸附可用Langmuir模型和Freundlich模型描述,高温焙烧改性膨润土对氟离子的吸附则符合Freundlich模型。     

膨润土碱熔活化水热合成NaP沸石分子筛

为利用膨润土合成NaP沸石分子筛,研究了膨润土的成分,该膨润土的主要成分为蒙脱石和石英。采用向膨润土中加碱在850 ℃碱熔1 h的方法,活化了膨润土中的蒙脱石和石英,获得了高活性的原料。采用水热合成的方法,通过正交实验,确定了合成NaP沸石分子筛的优化条件：二氧化硅与三氧化二铝物质的量比为5、氧化钠与二氧化硅物质的量比为1.6、水与氧化钠物质的量比为50、50 ℃老化2 h、95 ℃晶化9 h。X射线衍射和扫描电镜分析结果表明,所得产物为纯净的NaP沸石分子筛,平均粒径为1 μm,干沸石的钙离子交换量（以碳酸钙计）为315 mg/g。     

膨润土制洗涤助剂4A沸石的研究

本文研究了用膨润土合成4A沸石影响其质量的因素,特别指出了碱处理酸化物的重要性。对产生的废酸和废碱进行了综合利用。试验结果表明用句容甲山-3膨润土合成的4A沸石在洗衣粉中应用去污效果良好。     

膨润土、沸石和赤泥用作垃圾填埋场底部防渗衬里的机理探讨

通过膨润土、沸石和赤泥三种材料的单层衬里土柱试验,对比研究了渗透前后衬里材料物相变化和渗透滤液的成分变化,探讨了三种天然矿物材料用作垃圾填埋场衬里的防渗及衰减有害有机物的机理,为用三种矿物材料构建复合矿物衬里提供重要借鉴.结果表明,膨润土主要依靠吸水膨胀性及吸附性降低渗透系数和衰减有害物质;沸石复杂的孔道结构决定了其良好的衰减有害物质能力;渗透后赤泥中方解石和文石含量增加,强度增大,确保衬里结构完整,Fe~(3+)被有机物还原有利于增强衰减能力.     

膨润土深加工制备P型沸石

以廉价的膨润土为原料,分别进行了氢氧化钠水溶液高温活化和氢氧化钠碱熔活化制备P型沸石的实验,合成了两种结构不同的P型沸石,并对合成产品作了表征和物化性能测试.结果表明:碱法工艺具有资源利用率高,无废液排放等优点.合成的P型沸石性能比4A沸石优越,是理想的洗涤助剂替代品.     

黏土类矿物合成多孔分子筛的研究进展

综述了以黏土类矿物合成沸石分子筛的特点,分别介绍了高岭土、膨润土、海泡石的组成、结构及其在合成沸石分子筛时对以上3种黏土的处理改性,并阐述黏土类矿物制备多孔分子筛的应用前景.     

吸附性矿物在复混肥生产中的应用研究

对沸石、膨润土、硅藻土、凹凸棒土、海泡石、轻烧镁等吸附性矿物在复混肥生产中的应用进行了研究。     

非金属矿加工专利文摘（国内）

一种制造超细碳酸钙分散性颗粒的方法,一种高度交联型烯烃聚合物／碳酸钙复合型纳米粒子的制备方法,一种多功能绿色环保纳米二氧化钛涂料及其制备方法,一种无机-有机复合膨润土废水处理材料的制备方法,宠物用猫砂及其制备方法     

Investigation of the effect of zeolite,bentonite, and basalt fiber as natural reinforcing materials on the material properties of PPS and CF-reinforced PPS

This study was performed to expand the usage area of phenylene sulfide (PSS) by reducing its cost without deteriorating the material properties. For this purpose, mechanical, thermo-mechanical and abrasion tests were conducted to composite materials obtained by adding carbon fiber (CF), basalt fiber (BF), zeolite, and bentonite into PPS, and the effects of additive type and ratio were examined. For the test samples, fabricated by the melt blending, the fiber content was 10 wt.%, while zeolite, and bentonite ratios were 1, 5, and 10 wt.%. According to tensile and abrasion test results, zeolite, and bentonite improved the properties of fiber-reinforced PPS by showing a synergistic effect. It has been demonstrated in this research that the cost of fiber-reinforced PPS matrix composites, which are widely used in advanced engineering applications, can be reduced by using natural minerals zeolite and bentonite without sacrificing material properties. Findings obtained from mechanical and wear tests, revealed that the composition containing 10, 10, and 80 wt.%, zeolite, CF, and PPS, respectively, exhibited optimum material properties. BF for PPS has been shown to be an alternative reinforcement to CF, as it exhibits the lowest wear rate and better interacts with particles in the matrix.     

Effect of physico-chemical conditions on the properties of zeolite microparticles used in pulp and paper applications

Zeolites are framework aluminosilicates that have been proposed as a replacement for bentonite in microparticle retention systems. It has been claimed in many patents that zeolite can improve sheet formation in fine paper manufacturing. However, this improvement was not observed in mechanical grades. These experimental results, and also theoretical evidence, suggest that papermaking pH plays an important role in zeolite efficiency. In consequence, the effect of pH and temperature on the chemical properties of zeolite and bentonite microparticles was determined. Streaming potential, conductivity, and pH were measured while microparticle solutions were gradually acidified to pH 5. Samples were also taken at specific pH values to measure the cationic demand. Results showed that a gradual reduction of pH caused several modifications to zeolites. The first step was the neutralization of free hydroxyl ions in solution. The second step was an irreversible exchange of the charge-compensating sodium ions by hydrogen ions on the inner and outer surface of microparticles. Finally, dealumination of the zeolites occurred. It was determined that neutralization must be completed before ion-exchange can begin. However, ion-exchange and dealumination occurred simultaneously. Between pH 7.5 and 9, zeolites had more anionic sites than bentonite (around 0.8 meq/g vs. 0.5 meq/g). The higher surface charge of zeolites might partly explain their efficiency in microparticle systems. On the other hand, under pH 7.5, the anionic charge of zeolite samples rapidly decreased while that of bentonite was stable. The effect of temperature was also studied in the 25 to 55 °C range. Generally, a temperature rise promoted a greater dissociation of the surface hydroxyl groups and an acceleration of ion-exchange and dealumination processes.     

河南省肖河沸石矿应用研究

对河南省肖河沸石矿进行了系统的物性测定和化学分析以及对其在肥料生产中的应用进行了实验研究。结果表明：该沸石矿不仅含有对植物生长有用的Ｋ２Ｏ、ＭgＯ以及Ｚｎ，Ｃｕ ，Ｍｎ，Ｆｅ等多种微量元素，而且具有较强的吸附性和阳离子能力，对改良土训和提高肥效均具有显著影响。肥效试验证明，沸石复混肥与对照相比可提高产量４５．７％，比添加膨润土的情况增产７．６％。     

有机粘土吸附处理水中苯酚的性能及应用

分别用溴化十六烷基三甲铵（ＣＴＭＡＢ）、氯化十六烷基吡啶（ＣＰＣ）和氯化十四烷基吡啶（ＴＰＣ）改性膨润土、沸石和硅藻土；探讨了制备有机粘土的适宜条件；研究了粘土类型、表面活性制种类及其浓度对有机粘土吸附处理水中苯酚性能的影响。结果表明，有机粘土吸附处理苯酚的性能较钉适应的的土好得多。通过Ｘ－衍射分析等手段探讨了有机粘土的结构及其吸附处理。     

利用膨润土合成4A沸石试验研究

以膨润土为原料，通过选矿提纯，酸化，碱化，成胶，晶化这一工艺过程合成了4A沸石，并探讨了分子筛的合成条件。     

Transesterification of sunflower oil over zeolites using different metal loading: A case of leaching and agglomeration studies

The aim of this study was to analyse the catalytic performance of several heterogeneous catalysts in the transesterification of sunflower oil with methanol. In order to characterize the different catalysts, nitrogen adsorption/desorption and CO₂ temperature programmed desorption were used. The transesterification of sunflower oil was carried out using three different zeolites: mordenite, beta and X, to determine the influence of the kind of zeolite on the methyl ester production. The influence of the metal incorporation technique was studied using both impregnation and ion-exchange methods. Also, the transesterification reaction was carried out using catalysts with different metal loading. Finally, zeolite X was agglomerated with a binder, sodium bentonite, to study how the presence of a binder could change the catalytic performance of the zeolite. A methyl ester content of 93.5 and 95.1 wt% was obtained at 60 °C employing zeolite X with or without sodium bentonite, respectively. All biodiesel synthesized were characterized using the standard UNE-EN 14214. A complete deactivation study was carried out in order to check the sodium leaching from the catalyst. The results supported the hypothesis of a homogeneous-like mechanism where the alkali methoxide species were leached out.