国内磨矿回路中矿浆粒度的在线检测

在线检测矿流粒度分布对指导生产操作和获取最佳经济效益至关重要。本文介绍了PSM-400和PSI200两种不同类型的在线粒度分析仪的原理、配置、应用技术和应用效果。永平铜矿在实践中总结了PSM-400型超声波粒度分析仪的频率选择和标定方法。PSI200型粒度分析直接线性测量具有无可比拟的优越性，应用前景广阔。     

介绍一种新型的粒度分析仪PSI200

在线检测矿流粒度分布对指导生产操作和获取最佳经济效益至关重要。在检测原理上有重大突破的ＰＳＩ２００型粒度分析仪由四个部分组成，测量头是核心，控制手段利用了ＰＬＣ。其直接线性测量的原理带来了无可比拟的优越性，从而具有广泛的应用前景。     

基于数字图像处理的球团矿粒度检测

为了解决球团矿粒度的在线检测，在分析了球团图像特征的基础上，合理地运用计算机图像处理与识别技术实现了球团粒度检测及粒度分布计算。样本实验结果表明，粒度测量结果能够较真实地反映实际球团粒度分布范围。     

粉体粒度分析检测方法概述

通常用构成粉体的基本单位－颗粒的性质来研究粉体物料的行为，而颗粒具有形状，粒度，密度和比表面积四大基本特征，其中颗粒粒度是表征颗粒状态的重要参数。在很大程度上，它决定着最终粉体物料的用途和制品的性能，所以研究颗粒粒度是非常有必要的。近年来，随着我国氧化铝行业多品种氧化铝生产的发展，氧化铝粉体的粒度分布检测在该行业就显得尤其重要，然而由于没有统一的仪器及标准，同一样品送至不同单位检测结果往往不同，常使人困惑，本文旨在从粉体的颗粒粒度，粒度检测方法等各方面对粉体粒度检测进行论述，从而使人们对粒度检测有一个全面的认识和了解。     

图像识别技术在炼铁原燃料粒度检测中的应用

论述了图像识别技术在高炉原燃料粒度检测中应用的技术原理,原燃料粒度大小对高炉料柱的透气性的影响非常大,实时了解原燃料粒度大小及分布变化趋势,对把控高炉炉况趋势越来越重要;本研究是通过数字图像处理技术来实时在线获得原燃料粒度的变化情况,该技术在生产中的实际应用取得良好的效果。     

粒度显示器测量生球团矿粒度过程的自动化管理系统

描述了在运动状态下，用粒度显示器视频计算机系统（TBKC粒度计完善方案）进行球团矿粒度组成的无接触测量。在原料造球管理实验算法的基础上，按照粗糙度指标，显示了对于圆盘造球机球团分离区自动化系统应用的前景。     

粉尘的沉降性能及粒度分析

本文介绍了工业粉尘的粒度概念，以及微细颗粒在流体中的运动特征，讨论了静止流体中颗粒沉降终速斯托克斯公式在粒度分析中的应用，分析了颗粒群中颗粒的分布情况。     

图像技术在球团方面的应用及未来发展方向

<正>图像技术在球团中的应用集中在成品球团矿平均粒度在线检测、球团矿还原膨胀测定和回转窑生产氧化球团时窑内温度的在线监测等。图像技术在球团生产的应用还不是很广泛,目前仅局限于成品球团矿平均粒度检测、球团矿还原膨胀测定以及回转窑内部球团和烟气温度测定。未来发展方向应该更多地着眼于整个球团的     

浅谈袋装铁合金自动取样机应用实践

中南股份检测中心的5E-CPY型袋装铁合金取样机主要负责对袋装铁合金的机械取样。该机功能相对单一，仅有取样功能，未配备除尘系统，不具备袋装铁合金在线粒度检测功能。粒度检验只能通过人工筛分，效率低下。文章介绍了检测中心通过工程改造项目运用的一套先进袋装铁合金自动取样及粒度检验系统，解决了改造前袋装铁合金检验存在的问题，提升袋装铁合金质量检验装备水平，堵塞管理漏洞，改善作业环境和降低劳动强度，提高检验效率。     

基于Unet网络的烧结混合料粒度检测模型

目前烧结生产中混合料粒度主要通过人工检测方式获取,该操作方式不连续,且准确度有待提高,难以确定粒度分布与烧结生产参数之间的定量关系。因此,本文提出一种烧结混合料粒度检测模型,该模型采用CCD工业相机和工业光源作为混合料图像的主要采集设备;在图像预处理过程中,使用加权平均法用于图像的灰度化处理;在粒度检测模型构建中,应用Unet网络对烧结混合料图像进行分割处理。结果表明：工业光源的使用提高了采集时的亮度,也能在最大程度上降低外界光线的影响,确保烧结混合料图像的稳定性;图像预处理有助于分辨烧结混合料的颗粒特征,在此基础上,使用中值滤波和直方图均衡化更适合表征图像中混合料颗粒的边缘,并将颗粒内部特征模糊化,对噪声及其他不利因素有很好的去除效果;训练好的Unet网络分割模型对烧结混合料的分割准确率达到91%以上,分割精度误差低于9%,对混合料图像的分割效果较好。该模型的应用可为烧结生产提供及时、准确的粒度分布数据,有助于提高烧结混合料粒度检测效率,帮助企业提升经济效益和社会效益。     

还原工艺对钼粉粒度和氧含量的影响

以仲钼酸铵、三氧化钼、二氧化钼和钼粉为原料,采用不同的温度和不同的料层厚度进行了还原,分析了所得钼粉的粒度、氧含量和形貌,剖析了同舟内不同层次钼粉的粒度和氧含量的变化规律。     

Comparison of Grain Size in Plain Carbon Hot-Rolled Sheets Manufactured by CSP and Conventional Rolling Processing

 Average grain size and grain size distribution in as hot-rolled SPHC, SPHD, and SPHE sheets manufactured by compact strip production (CSP) processing and traditional continuous casting and rolling (CCR) processing respectively were investigated by quantitative metallographic method. The results show that the average grain size and distribution width of grain size in sheets manufactured by CSP processing was obviously larger than that by CCR processing. It was analyzed that multi-phase transformation and high reduction ratio in CCR processing resulted in refining grain size, which would be dominant reason for controlling grain size. In plain carbon steels such as SPHC, SPHD and SPHE, the effect of fine precipitation in CSP on behavior of deformation and recrystallization of austenite during rolling, and consequent refinement of grain size seem not to be as important as the effect of re-heating and roughing in CCR processing. Homogenizing in re-heating and refining grain size in roughing in CCR processing would refine final grain size and also make grain size homogenized. Very coarse grain size would result in mixed grain size, large distribution width of grain size due to interaction of static and dynamic recrystallization in CSP processing.     

粒度仪在巴润选矿厂的应用

在选矿工业中,粒度无疑是选矿作业较为重要的指标,粒度的测定也就显得尤为重要。粒度仪是用一定的自动控制方法测试固体颗粒的大小和分布的一种仪器,文章主要是对矿浆样品的指标进行化验分析,得出DFPSM超声波粒度仪在选矿作业中的准确性,并对其与粒度大小、料流稳定的关系做进一步分析。     

Modeling of thermomechanical processing of heat-treatable aluminum alloys

This paper describes formulation of a model for calculating recrystallized grain size for heat-treatable aluminum alloys subjected to thermomechanical processing for grain size control. When combined with Zerer's equation for the limiting grain size during grain growth in particle-containing materials, the model can be used to calculate the stable grain size after thermomechanical processing. A set of adjunct models and experimental observations have been used to relate alloy composition and processing parameters to the intermediate variables which are inputs to the model for recrystallized grain size. Model results are compared with experimental data from various sources. Modeling results exhibit all of the trends observed in the experimentally-determined grain sizes for AA7075, for AA6063, and for modified AA7475 alloys containing different dispersoid-forming additions.     

微细钼粉的团聚及其对钼丝加工的影响

对生产细钼丝用微细钼粉的形貌和结构进行了显微分析和研究。结果发现,微细钼粉的团聚结构,其中包括晶粒界面、钼粉颗粒界面和团聚钼粉的表面不但对钼氧化物的还原速度,而且对钼粉的加工性能发生了重要的影响。研究结果表明,微细钼粉的团聚度主要取决于其母体所由生成时包括加料方式在内的酸度控制技术。为了生产轻微团聚、粒度均匀的微细钼粉以便为细钼丝生产提供优秀原料,应当严格控制生产β型四钼酸铵的酸度条件。     

PARTICLE SIZE AND SHAPE CHARACTERISTICS OF KEMERBURGAZ QUARTZ SANDS OBTAINED BY SIEVING,LASER DIFFRACTION,AND DIGITAL IMAGE PROCESSING METHODS

The ever-progressing development of industrial processes and products regularly requires significant progress in the development of associated measurement techniques. With the advance of technology, there have been many developments in the mining sector. Mineral particle size is a critical parameter in any process involving the liberation and separation of minerals. In most mineral processing plants, product grade and mineral recovery require sufficient mineral liberation and optimum size distribution. There are many methods of measuring mineral particle sizes. Sieving, sedimentation, microscopy, digital image processing, and laser diffraction are the most common particle size analysis methods. The shape of the particles plays an important role in the assessment of particle size distribution. Most sizing techniques, however, assume that the sample being measured is spherical, as a sphere is the only shape that can be described by a single number. Therefore different techniques can give different results for the same sample depending on this aspect. Within the scope of this study, the particle size distribution of two different sand samples (Sarikum and Senkoy) was assessed by sieving, digital image processing, and laser diffraction techniques. In addition, the convexity and circularity parameters of the samples were measured by a Morphology G device. The particle size distribution results obtained from different techniques for each sample are discussed depending on the values of convexity and circularity of the sample particles.     

THE CONTROL OF GRAIN SIZE IN THE MANUFACTURE OF SINTERED HARD-METAL

Abstract

In sintered hard-metals grain-size control is of exceptional importance because the basic properties of wear-resistance and strength are critically dependent upon it. In some applications a change in average grain size from 5·0 to 1·0 μm can increase wear-resistance by as much as twenty times, while the same change can halve the transverse rupture strength.

Each step in manufacture, from the chemical processing of the ore to the final sintering operation, can influence the final grain size. The factors operating at each stage are not yet completely understood. However, the most important processes of tungsten reduction and carburizing have been closely studied and these are chosen to control and monitor grain size during manufacture. The factors influencing grain size during these operations are discussed in some detail. The difficulty of relating powder-particle size and sintered-product grain size is mentioned. This is largely due to the weaknesses of conventional methods of measurement. Size changes in reduction, carburizing, and milling have been examined by metallographic means, and this has shown clearly the effect of aggregation and of polycrystalline particles in confusing the relationship between powder-particle size and sintered grain size.

The metallographic method of mounting products in copper has been especially informative with products with a grain size of > 1·5 μm, but optical limitations make the results less clear with a finer size. However, inferences drawn from this work have been largely confirmed by the scanning micrograph.     

亚共析钢复相组织中铁素体晶粒尺寸测定方法

亚共析钢复相组织主相的晶粒尺寸主要采用金相法和扫描电镜 EBSD 法。其中,金相法可以测量晶粒尺寸并对其评级,定量测量过程需要手动完成;扫描电镜 EBSD 法可对经过电解抛光的试样进行晶粒尺寸的自动测量,借助两相花样质量的差异,实现对铁素体+珠光体复相组织中铁素体晶粒的自动统计。     

高等级管线钢的超细晶粒控制

论述了高强度管线钢超细品粒控制的材料学原理和关键技术.分析了应变诱发相变和超细奥氏体强化相变这两种超细品粒控制方法的原理、工艺设计原则以及工业化应用需要注意的问题.讨论分析的结果表明,轧制过程中积累足够大的应变是实现超细晶粒控制的关键.在工业生产中只能通过多道次轧制工艺逐个道次的应变累加实现所需的应变积累.而抑制道次之...     

制锁用H65黄铜带材深冲性能的研究

晶粒的大小、均匀性及取向决定着带材深冲性能,其受到加工率、退火温度、原始晶粒大小等因素的影响。可采用多轧程轧制和退火的方法生产制锁用H65黄铜带材,均匀分配加工率,采用中轧加工率55%、中间退火工艺460℃~520℃×8h,有利于带材深冲性能的良性遗传;采用精轧加工率50%、成品退火温度680℃,晶粒度控制在20~25μm,充分均匀晶粒和优化结晶取向,可提高带材深冲性能避免深冲破裂。