共查询到19条相似文献,搜索用时 78 毫秒
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对于高压料床挤压粉碎时难以定量检测料饼中细粉含量的问题,本文从理论结合实验提出了一种间接有效的检测方法。通过对不同阶段特点的分析,提出采用球磨机多次研磨并通过回归算法计算原始料饼的颗粒分布,进而准确的评价设备的粉磨效果。 相似文献
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对于物料经高压料床挤压粉碎后形成的料饼中细粉含量难测定、在不破坏级配的情况下难打散的问题,提出一种用于测定料饼中颗粒分布的方法:采用球磨机中装入轻质低密研磨体(橡胶球等)的料饼打散装置;通过试验和数据分析设置研磨体的参数、研磨打散时间T;在此参数配置下用磨机打散挤压后的料饼,再对打散的物料进行筛析。如此,既可实现料饼的充分打散,而又能在不改变此物料级配的情况下得到粒度的分布。进一步地,可用于开展辊压机等料床粉碎设备的挤压破碎和闭路循环挤压的实验研究工作,为料床粉碎设备的闭路循环挤压实验研究提供新的分析手段和方法。 相似文献
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本文研究了低温透明熔块釉不同粒度分布对锆基色料发色的影响,通过对比试验得出了适合锆基色料发色的粒度范围,并简要考察了影响锆基色料在熔块釉中发色的因素。 相似文献
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为了综合利用我国的煤炭资源,本文通过中试制浆试验及试烧,认为洗煤厂的煤泥可以制备水煤浆,作为水煤浆加压气化的原料。 相似文献
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在直径1 m,高8 m的半圆冷模射流流化床上,利用PC-4颗粒浓度测定仪和局部取样的方法,考察了细粉通过密相输送的方式进入中心射流区时,射流区域的颗粒浓度分布.实验所用细粉粒径为-80 160目(均粒径为138 μm)的聚氯乙烯细粉颗粒,粗颗粒为均粒径为1.1 mm的聚苯乙烯颗粒,研究结果表明,在流化床射流区域存在一细粉高浓度区,在径向上,细粉颗粒浓度呈先增高后降低的趋势,在轴向上,当达到一定射流高度的床截面时细粉浓度逐渐降低,在两种不同细粉进料量时,射流区域细粉浓度的增大幅度与进料量的增加成正比,在较低进料量时,细粉高浓度区较不明显且靠近分布板区域细粉浓度较高,较高细粉进料量时,细粉高浓度区域更为显著. 相似文献
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采用激光粒度分析仪对某种微细粒级荧光粉运用不同的样品循环运动速度和加载超声波进行粒度组成与分布的测量。通过正态曲线叠加比较获得:该微细粒级荧光粉颗粒平均直径为4.128μm,中值为3.145μm,标准差为3.930μm,变异系数为95.10%,众数为4.048μm,并测得不同粒径颗粒所占的质量分数。结果表明,该方法是粉末粒度及粒度分布测量的准确方法。 相似文献
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Wet screening is one of the methods used to remove fine material from the coal feed to gasification. Sasol Synfuels in South Africa undertook an investigation to quantify fine coal generation in the coal supply to gasification. Coal samples were wet screened in the laboratory and results compared to the normal dry screening procedure. It was found that the fines (−0.5 mm) increased almost five times when the coal was wet screened compared to dry screening. This study was subsequently initiated by Sasol Technology R&D to establish the mechanism of fine coal generation during wet screening, as well as the effect of wet screening on particle size distribution (PSD) and chemical properties of coal. Changes in the PSD and chemical properties of coal from individual coal sources used at Sasol Synfuels were compared. Composite coal samples with a predetermined PSD of all individual coal sources used at Sasol Synfuels were screened under wet and dry conditions. The PSD was again determined after screening, as well as the mineral composition (by X-ray diffraction) of the fines. Results indicated that wet screening caused clay minerals to be removed from the coal structure leading to an increase in the fines. This removal of minerals weakened the coal structure causing further size degradation of coarser fractions. 相似文献
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Zhao Feng Jianqi Qi Xu Huang Xiaofeng Guo Yin Yu Xiuxia Cao Yuezhong Wang Di Wu Chuanmin Meng Tiecheng Lu 《Journal of the American Ceramic Society》2019,102(5):2377-2389
A detailed investigation of planetary ball-milling for coarsened AlON powder was carried out. Our results showed that the weight ratios of milling ball-to-powder, the revolution rate and the planetary ball-milling time have significant impacts on the microscopic morphology, particle size distribution and average particle size of powder. The process and mechanism were analyzed, and the outcome of our study can be used to optimize the complicated planetary ball-milling method by controlling the planetary ball-milling time or adjusting the revolution rate at the final stage of planetary ball-milling. Sequentially, using fine and uniform AlON powder by optimized planetary ball-milling with an average particle size below 300 nm and excellent sintering properties, highly transparent AlON ceramic with an in-line transmittance of 84% at 2000 nm was successfully prepared through pressureless sintering at 1880°C for 6 hours using the elaborative treated powder synthesized from carbothermal nitridation method. 相似文献
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利用群体粒数衡算(population balance,PB)计算机模拟和实验研究了甘露醇水溶液的喷雾干燥过程中液滴的粒度分布的变化规律。液滴干燥过程中的颗粒粒度的萎缩速率,在群体粒数衡算模型中描述为液滴的逆(或负)生长项,通过单个液滴反应动力学方法(reaction engineering approach,REA)获得。基于单个液滴干燥的反应工程方法模型REA和群体粒数衡算模型PB集成建立了PBREA模型。PBREA 模型的求解是通过高分辨率数值方法。本文模拟研究了不同工况下,不同粒径液滴的干燥时间、液滴平均含湿量以及液滴粒度分布随时间的变化。结果显示,液滴粒径越大,干燥时间越长,模型预测的颗粒平均粒径为实验值的1.0~1.5倍,粒度分布跨度是实验值的0.61~0.89倍。模拟误差主要来源于液滴及颗粒粒径分布统计精度、单个静止液滴与群体运动液滴干燥的差异、热导率及扩散系数是经验值3个方面。在使用Buchi 290 小型喷雾干燥仪进行的实验中,使用了图像采集和分析方法得到了液滴及颗粒的数密度分布,并和模拟结果做了对比。结果表明该模型可以有效地预测喷雾干燥过程中干燥颗粒的平均粒度及分布跨度。 相似文献