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利用激光粒度仪测定精对苯二甲酸的产品粒度,探讨了激光衍射法在测定精对苯二甲酸产品粒度分布中的应用情况,并与传统的筛分法进行了比较,开发了几种新的分析模式。结果表明,激光粒度法可测定出精对苯二甲酸颗粒的各种分布形式,测定方法简便、快速,测定结果重复性好,准确度高,对生产的指导意义较大。 相似文献
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介绍了用马尔文激光粒度仪测定4A沸石粒度分布方法,通过实验对比找到了优化的测试条件。此外,据国家标准(QB/T 1768—2003)的规定,电对4A沸石粒度分布进行TN定。通过对比,在经过优化的测试条件下,使用马尔文激光粒度仪测定的粒度分布结果,可以和国标(QB/T 1768—2003)的测试结果相匹配,从而达到实验目的。优化的测试方法容易建立,精密度高,已得到应用,效果良好。 相似文献
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从粒度分布的测定方法、测定原理和特点,介绍了BT-9300S激光粒度分布仪在陶瓷生产中的应用。在陶瓷产品生产过程中,快速测量和有效控制粉体的粒度及其分布,对提高产品质量、降低生产成本具有重要意义。 相似文献
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Boehmite sol was prepared by hot water hydrolysis of aluminum iso-propoxide using nitric acid as the catalyst. Calcium nitrate to yield 0–20 vol% calcia was added to the boehmite sol. The boehmite with additives was calcined at 600°C for 3 h. The calcined powder was milled at 230 rpm for 6 h and particle size was measured using Laser particle size analyzer. The powder samples were calcined at 1600°C for 3 h and the formation of calcium hexaaluminate was discussed using phase diagram, transmission electron microscope, energy dispersive spectra, and X-ray diffraction spectra. The powder samples calcined at 600°C for 3 h were compacted into cylindrical pellets and sintered at temperatures ranging from 1400° to 1600°C for 6 h and the formation of hexaaluminate (platelike) grains were confirmed using Scanning electron microscope and optical microscopy. 相似文献
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用有机硅、甲基丙烯酸及其酯类单体接枝改性环氧树脂,合成了具有自乳化性能的水性环氧树脂乳液。用激光粒度分析仪测定乳液的粒径及其分布,用傅里叶红外、热重分析仪对聚合产物作了结构表征和热分析。考察了温度、引发剂用量对接枝率及接枝率对乳液成膜性能的影响;甲基丙烯酸、有机硅及单体总量对乳液稳定性、成膜物耐水性和耐盐水性的影响。结果表明:当配方选用引发剂、有机硅用量分别为单体总质量的5.5%、2.5%,m(单体总量)∶m(环氧树脂)=1∶2,丙烯酸及其酯类单体的玻璃化温度Tg为30℃,体系酸值为35 mgKOH/g,接枝温度为110℃时,制得的水性环氧树脂乳液具有良好的稳定性、耐水性及耐盐水性。 相似文献
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Heekyu Choi Woong Lee Dong-Uk Kim Shalendra Kumar Jonghak Ha Seongsoo Kim Jungeun Lee 《Korean Journal of Chemical Engineering》2009,26(1):300-305
We report the particle size distribution of poly component particulate systems studied in three kinds of experimental methods.
Six analyzers, such as Mastersizer Microplus (Malvern Instruments Ltd., UK), LS230 (Coulter Electronics Ltd., USA) LMS30 (Seishin,
Japan), Analysette22 (Fritsch, Germany), HELOS (Sympatec, Germany) based on a laser diffraction and scattering method, and
the SKC-2000S (Seishin Co., Ltd., Japan) based on the centrifugal sedimentation method, were used to study the particle size
distribution. The results do not show reasonably good agreement between the different analyzers and different sample systems.
There is a discrepancy regarding the absolute values, which can be explained by the fact the techniques used are based on
different measuring principles. The results of the present study reflect that the investigator must carefully select the particle
size analyzer for a particular application. Therefore, we suggest that it is necessary to measure the particle size distribution
by using at least two types of analyzers or more of different makers. 相似文献
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多晶硅合成过程中副产大量四氯化硅。以四氯化硅为硅源,通过水解反应成功合成了二氧化硅粉体。探讨了反应温度、四氯化硅的加料速度、四氯化硅和水的加料比、循环比等条件对二氧化硅比表面积的影响,并利用X射线粉末衍射仪、傅里叶红外光谱仪、比表面测定仪和粒度分析仪等测试工具对所制备的二氧化硅的结构、粒径等参数进行了表征。实验结果表明:在温度为50 ℃,四氯化硅的加料速度为2.0 L/min,加料比[m(四氯化硅)∶m(水)]为0.10~0.15,循环比为10 h-1的条件下,可制得满足橡胶补强剂要求的二氧化硅粉体。 相似文献
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Xingfu SONG Shuying SUN Dengke ZHANG Jin WANG Jianguo YU 《Frontiers of Chemical Science and Engineering》2011,5(4):416-421
Magnesium hydroxide with high purity and uniform particle size distribution was synthesized by the direct precipitation method using MgCl2 and NaOH as reactive materials and NaCl as additive to improve the crystallization behavior of the product. The particle size distribution, crystal phase, morphology, and surface area of magnesium hydroxide were characterized by Malvern laser particle size analyzer, X-ray diffraction (XRD), scanning electron microscope (SEM) and Branauer-Emmett-Teller (BET) method, respectively. The purity of products was analyzed by the chemical method. The effects of synthesis conditions on the particle size distribution and water content (filtration cake) of magnesium hydroxide were investigated. The results indicated that feeding mode and rate, and reaction temperature had important effects on water content and the particle size distribution of the product, and sodium chloride improved the crystallization behavior of magnesium hydroxide. The ball-like magnesium hydroxides with the particle size distribution of 6.0–30.0 μm and purity higher than 99.0% were obtained. This simple and mild synthesis method was promising to be scaled up for the industrial production of magnesium hydroxide. 相似文献
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以羰基镍粉为原料,采用焙烧法制备了氧化亚镍,并将其球磨后得到微米粉体。采用热重-差示扫描量热仪(TG-DSC)研究了羰基镍粉在空气气氛中加热时的氧化行为,利用激光粒度分析仪、等离子体光谱仪、X射线衍射仪(XRD)和扫描电镜(SEM)等分析了样品结构、成分和形貌。结果表明:空气和氧气两种气氛对产物纯度影响不明显。在两种载气条件下,通过优化焙烧温度和焙烧时间(焙烧温度为700 ℃、焙烧时间为2 h、载气流量为1.5 L/min),羰基镍粉可直接焙烧制备得到纯度为100%、结晶度高的面心立方体氧化亚镍,球磨后得到粒度为4~19 μm的类球形微米氧化亚镍粉末。制备过程具有工艺简单、环境友好的特点。 相似文献