椭圆等厚筛分技术及其应用

本文在对物料振动筛分析机理进行深入探讨的基础上,提出了椭圆等厚筛分新技术,阐述了随圆等厚筛分的原理及对物料筛分的影响。提出了椭圆等厚筛分技术是提高料处理量和筛分效率的先进筛分方法,并简介了该技术的应用情况。     

新筛分技术在铁合金生产上的应用

通过对不同筛分料的机理调研,针对性研制出新型筛分机组,创新性地解决了铁合金生产中铁合金成品、兰炭等易碎物料、硅石等物料的精细清洗及筛分问题,并通过工程样机的研制和试验,验证了新筛分技术机组对工艺要求的满足度及技术的可靠性。     

滚动筛分技术在铁前系统中的应用探讨

介绍了筛分技术在铁前系统中的应用现状及存在的技术难题,通过对滚动筛分技术的原理分析,探讨了滚动筛分技术在处理块矿、粉状物料筛分方面的优点,以及对炼焦生产配合煤选择性破碎工艺、烧结矿调质处理工艺、煤粉预筛分处理工艺等新技术应用的推动作用。     

筛分技术的进展——合成纤维筛网发展的新领域

引言 本文叙述合成纤维筛网和40—5微米微细颗粒的筛分技术。 提起筛分技术(即不分方法)人们总期望筛分机械(筛分设备或筛子)新产品的出现。但是,如果筛网技术若不伴随其发展,筛分也就不能充分发挥其效能。 一提到筛分,人们自然就会想到不锈纲筛网,但是最近合成纤维筛网的发展异常惊人,使筛网进入了多样化的时代。筛分机械的处理能力完全由筛网及其张力所决定。合成纤维筛     

活性石灰焙烧系统筛分装置改进措施

阐述了活性石灰焙烧系统中筛分装置的形式及工作原理,对改进后的筛分装置的结构形式,使焙烧系统的筛分效果更好。     

铝熔炼热铝渣的处理工艺与设备

以铝加工的铝熔炼特点为切入点,分析热铝渣的分类及成分组成,介绍了回转炒渣及筛分、压制及破碎筛分、高速搅拌及筛分3种热铝渣的处理工艺与设备,并结合它们的优缺点,明确了各自的应用范围。     

镍基高温合金粉末筛分工艺的研究

介绍了粉末筛分设备及其主要工艺参数 ,并围绕筛分处理的生产效率及粉末质量的影响因素展开了讨论     

提高烧结块筛分效率的工业试验

介绍韶关冶炼厂采用变频技术改变振动给料机和振动筛的工作频率,提高烧结块筛分效率的试验及效果。     

鄂钢380m^3高炉供上料系统设计

鄂钢３８０ｍ＾３高炉供上料系统设计采用了以下先进实用的技术：槽上矿、焦一次筛分,槽下矿、焦二次筛分,焦矿槽及返矿仓采用铸石砖内衬,槽下烧结矿及焦炭集中称量并进行误差补正,块杂矿及焦丁分散称量并进行误差补正,采用交流变频料车卷扬机,主控综合楼四位一体,槽上槽下均设电除尘等。     

提高烧结块筛分效率的工业试验

介绍韶关冶炼厂采用变频技术改变振动给料机和振动筛的工作频率，提高烧结块筛分效率的试验及效果。     

提高焦丁筛筛分效果的优化措施

详细介绍了在筛分面积、筛分时间、筛分振幅以及保证振筛稳定运行等方面的技术创新措施。通过改造振筛筛棒和孔距尺寸、安装控料速装置、增加振动电机配重以及程序控制等技术手段,提高了筛分面积,延长了筛分时间,提高了振筛振幅,保证了设备正常运行,显著提高了入炉焦丁的筛分质量。     

Effects of ultrafiltration on solute clearances in hollow fiber artificial kidneys

Although solute clearances in artificial kidney coils increase with ultrafiltration (UF), we have previously shown that increases are usually less than UF rate (most likely because of decreases in diffusive transport with UF coils and, for larger solutes, molecular sieving). The present studies demonstrate the effects of UF on clearances of Na and bromsulphalein (BSP) (mol. wt. 838) in hollow fiber dialyzers. Clearances were measured at increasing transmembrane hydrostatic pressures at perfusion rates of 200 and 500 ml. per minute. Fractions of total clearance attributable to diffusion as compared to solvent drag forces were calculated. Sieving coefficients were determined in studies where diffusion was minimized and clearance was primarily by solvent drag. Clearance increases were less than UF rate only for BSP; molecular sieving most likely accounts for the difference at high perfusion rates. Only at 200 ml. per minute was slight decrease of diffusion with UF suggested. Thus, in contrast to coils, there is minimal or no decrease in diffusion with UF in hollow fiber dialyzers.     

旋流式筛分过程初探

本文介绍了国内外传统旋流分级及其存在的缺陷,提出了一种新型的旋流分级器,即旋流筛分器,并分析了旋流筛分的条件及机理。指出旋流筛分为离心沉降分级和筛分的复合分级过程,前者会产生预分级的功能,以减轻筛网表面的颗粒负荷;由于旋流场分散特性及筛网的截留作用,可以提高分级精度。     

Replaceable polymers in DNA sequencing by capillary electrophoresis

Much progress has been made in the development of replaceable sieving polymers and capillary coatings for high-performance DNA sequencing by capillary electrophoresis. Several studies of parameters that affect resolution, read length and reproducibility have begun to reveal the physical mechanisms acting on single-stranded DNA during electrophoresis through semidilute polymer solutions. Recently developed electro-osmosis-inhibiting matrix polymers have simplified the process of coating capillaries, facilitating the automation of high-throughput parallel systems for large-scale sequencing.     

重型振动给料筛分机组的研究

通过对重型振动给料筛分机组的试用研究和工业应用，结果表明：具有给料筛分功能的重型振动给料筛分机组完全可以取代传统的重型板式给矿机。     

燃煤筛分特性对循环流化床锅炉运行的影响

分析了燃煤筛分特性对循环流化床锅炉运行的影响。     

粉末涂层材料粒度测试的研究

采用干筛分法、 激光衍射法和扫描电子显微镜法测试了粉末涂层材料的粒度, 对比了不同方法的测试结果, 研究了粉末材料的形貌对粒度测试的影响。 结果表明： 干筛分法测试球形的粉末、 不规则形粉末、 片状粉末的粒 度分布具有较好的重复性; 三种方法测试的结果相差较大, 且粒度越大, 差异越大。     

INVESTIGATION INTO THE POSSIBILITIES OF DEVELOPING A RATE METHOD OF SIEVE ANALYSIS

Abstract

At present it is difficult to assess the accuracy of a sieve analysis because it is necessary to decide arbitrarily when the sieving process is complete. The possibilities of the alternative approach of predicting the final sieve residue from a study of the rate of sieving, have been investigated. It is shown that for spherical particles on a wire-mesh sieve a “rate” method of analysis is possible which gives a value of the oversize percentage, independent of the operator and sieve loading. Experiments are described which indicate that the method may also be possible with irregular metal powders on wire-mesh sieves.     

Mechanisms of retardation of rigid spherical particles with 3 to 1,085 nm radius in capillary electrophoresis, using buffered polyacrylamide (molecular weight 5 x 10(6)) solutions

Subjecting particles in the size range of 3 to 1085 nm radius (R) to capillary electrophoresis in buffered solution of entangled uncrosslinked polyacrylamide (M(r) 5 x 10(6)), it was found that particle size-dependent retardation ("molecular sieving") becomes electric field- and particle size range-dependent once the particle size exceeds 15-20 nm in radius. The field strength dependence of the retardation coefficient [KR = d(log mobility)/ d(polymer concentration] and the positive or negative sign of dKR/dR suggest the existence of two different mechanisms of molecular sieving depending on the particle size range: particles with diameters less than the screening length (or blob size) of the polymer network are thought to penetrate into the available spaces within a discontinuous polymer network; particles with diameters larger than the screening length (or blob size) of the polymer network are thought to undergo size-dependent retardation by exerting shear stress against polymer chains, and displacing them, so as to cause local deformations in a continuous polymer network. A limit in the separating capacity of molecular sieving, due to a sharp increase in the rate of band widening with polymer concentration, was found when the value of the retardation coefficient exceeded 60 (mL/g).     

某厂硫酸车间循环冷却水化学处理研究

通过对某厂硫酸车间循环冷却水进行水质检测和化学处理,以及配方筛选等试验,研究了缓蚀阻垢剂复合配方（YS-607）在该循环水中对不同种金属材料的缓蚀性能。本研究结果对该厂循环水应有现实的指导意义。