球磨机转速、磨球尺寸对磨矿效率的影响

转速和磨球尺寸是球磨机的两个重要工作参数,为研究转速和磨球尺寸对磨矿性能的影响,本文选取3个不同的转速和2个不同的磨球直径,选用平均加速度、每百秒撞击次数、平均撞击强度、平均抛落次数和平均抛落高度5个参数作为评价磨矿性能的指标,通过惯性数据分析方法对磨球加速度信号进行定量分析。实验结果表明,当转速过低、磨球直径过大时,球磨机内部的磨球处于泻落状态,平均加速度值、平均撞击强度较低和每百秒的撞击次数较少,磨矿效率较低。     

磨机衬板与磨球配合磨损的实例浅析

1 引言球磨机衬板与磨球是水泥生产的易损件。磨机工作时,衬板受到磨球和物料的抛落冲击而磨损,还受到磨球的滑动磨损;磨球则受到衬板反作用的磨损、物料的磨损和磨球之间的磨损,它们之间相互作用又相互影响。在实践中,我们发现材料的硬度与耐磨性呈相关性,耐磨性随着硬度的提高而提高;同时还发现磨球和衬板是一对摩擦付,一方硬度提高则另一方磨损加快。因此,正确选择衬板与磨球配合工作,做到磨球耐磨的同时又对衬板的磨损最少,这关系到企业的效     

水泥磨机中高铬磨球基体组织选择的模拟研究

本文借助MLD-10型动载冲击磨料磨损试验机模拟磨球工况,提出了大、中、小型水泥磨机分别选用奥氏体基、回火聚合物基、马氏体基高铬铸铁磨球,耐磨性能最佳。     

六号合金衬板在管磨机中的应用

六号合金衬板在管磨机中的应用邹俊甫，邹伟斌广州军区黄石水泥厂黄石市二水泥厂众所周知，磨机运行过程中，磨料、磨球、衬板组成三体磨损体系。磨料受磨球冲击并在与磨球接触中受压而被击碎；钢球、磨料与村板受压应力作用楔人表面，切向力作相对运动，使钢球、衬板的表...     

低温环境下使用的S30408不锈钢焊接工艺研究

研究了焊接线能量、层间温度、焊缝组织、化学成分对S30408奥氏体不锈钢焊接接头低温(-196℃)冲击功的影响,结果表明,控制焊接线能量和层间温度可提高接头的抗冲击性能,焊缝铁素体含量及C含量也对冲击功有影响,铁素体含量和C含量越高,冲击功越低。     

新型研磨体的研究与应用

根据水泥磨机特有的工作条件,依据奥氏体在高应力冲击条件下具有加工硬化的特性,尝试了用高铬铸铁铸态铬奥氏体作为磨球的抗磨基体,阐述了铸态下获得奥氏体所遵循的化学成分设计原则。从高铬铸铁结晶的特性出发,分析了金属型铸造对磨球基体的强度、韧性和耐磨性的影响。     

球磨机磨球材质与衬板材质配副性的研究

在MLD-10型动载磨料磨损试验机上,选用高铬铸铁、马氏体球铁与45~#钢等三种磨球材质作为上试样;选用高铬铸铁、中铬铸钢与高锰钢等三种衬板材质作为下试样进行各自不同配副性的动载三体磨料磨损试验。结果表明:在相同衬板材质条件下,磨球材质硬度提高,其耐磨性增高;而在相同磨球材质条件下,并非衬板材质硬度越高,其耐磨性越高;但磨球材质硬度越高,衬板材质耐磨性趋向于增高。在冲击能量为2.5焦时,硬度最高的高铬铸铁相互配副时,其系统耐磨性最佳。     

球磨法制备超细稻壳二氧化硅

将稻壳用10％(体积分数)的盐酸处理后在600℃焚烧得到稻壳二氧化硅,再利用球磨法进行研磨,得到平均粒径为5.01 μm、分散度为1.31的超细稻壳二氧化硅粉体.研究了研磨时间、球料比和磨球直径对粉体粒径的影响,并对研磨前后粉体的性质、红外光谱(FTIR)及X-衍射图谱(XRD)进行了比较.结果表明:合适的球料比、磨球...     

纳米钛酸钡颗粒砂磨分散工艺研究

本文研究了使用砂磨机进行纳米颗粒分散时的流量设定和磨球选择。为了确保砂磨过程中磨球不会逸出或者聚集在砂磨机的一端，浆料在研磨腔体中的上升速度应小于浆料液面上升速度，因此使用不同粒径的磨球都有最大限制流量。研磨过程的分散效率采用田中粉碎方程进行计算，结合实验结果可以计算出被粉碎钛酸钡颗粒的粉碎强度，结合分散效率的曲线可计算出适当的磨球粒径，实验中要达到较高的分散效率，所需的磨球粒径为0.08～0.10mm。     

风淬高铬铸球的试验研究

风淬高铬铸球的试验研究唐山水泥机械厂李雨森当前各种球磨机中采用的研磨介质种类繁多。其中有：马氏体球墨铸铁磨球、高碳低铬合金铸球、磷铜钛多元合金铸球、铬钒钛铸铁磨球、铬钼铜白口铸铁磨球、多元合金铸钢磨球、高铬铸铁磨球、高铬铸钢磨球等。但就大型水泥磨机来...     

合理配球提高球磨机的生产能力

在钙镁磷肥半成品加工生产过程中,为了使磨机的粉碎效率高,只单纯考虑研磨体的装载量是不够的,还必须确定研磨体的规格及用量,即研磨体的级配.介绍研磨体级配的平均球径与研磨物料平均粒径的关系.     

球磨机研磨体级配设计与计算

球磨机研磨体合理的级配,对提高磨机产量和产品质量、降低粉磨电耗,具有重大的作用。在总结几百家水泥厂磨机工艺技术员工作经验的基础上,根据笔者长期从事物料粉磨研究和实践的心得体会,综合考虑研磨体总装载量、各仓填充率、平均球径、物料水分、物料流动性、物料粒度、隔仓板形式、隔仓板篦缝大小、各仓长度、粉磨流程等因素,详细介绍了球磨机研磨体级配计算的方法、原理和步骤,并编制成“球磨机研磨体级配及补球计算程序”软件。     

球磨机大型化的界限问题(一)

本文分析了球磨机大型化的界限问题，同时提出了适合当前生产力水平的球磨机最佳直径的确定方法——技术经济指标封闭图。     

高压水射流切割技术及在建材领域中的应用

本文介绍了高压水切割原理，机构组成，加工非金属材料的工艺参数及在建材领域中的应用。     

超细石英砂粉体的机械球磨工艺优化研究

利用长江沿岸低品位石英砂开发研制保温隔热砖,研究球磨参数对低品位石英砂粒径的影响,为制备高性能的保温隔热砖奠定原料基础。研究结果表明:随着球磨时间的延长,石英砂粒径减小;随着球磨转速的增加,石英砂粒径逐渐减小;随着球磨机装料量的增加,石英砂的粒径增加;随着球比的增加,石英砂粒径逐渐增加。综合考虑整个工艺过程性价比,确定最佳球磨参数为:球磨时间为60min,球磨转速为300r/min,球磨机装料量为200g/L,大小球质量比值为0.75。     

Optimization of variables in grinding brass particles for paint and pigment industry

Flaky metal powders commonly used as paint and pigments, are generally produced by grinding in ball mills or vibration mills. The key to good quality powder production is to optimize the processing parameters. In the present work grinding of brass particles is studied in detail in a laboratory size ball mill to determine the optimal levels of the ball to material ratio, type and amount of additives, mill speed, ball load, etc. The quality of the powder is assessed on the basis of water coverage, degree of flattening and luster by visual inspection. Preliminary results in a 35 cm diameter ball mill with 30% ball load show that a material to ball ratio of 0.067 with a 0.1% dosage of stearic acid is required for good quality powder. For determining optimal mill speed and ball size a 2² factorial design of experiment has been followed. It has been determined that to achieve best powder quality the mill must run at 70% critical speed and the ball size must not exceed 20 mm. The quality of the powder assessed through SEM study for surface morphology and particle size analysis compares very well with the industrial samples.     

The effect of ball and mill diameters on grinding rate parameters in dry grinding operation

For dry ball mill grinding operation, the effect of ball and mill diameters on grinding rate parameters of the size-discretized population balance model has been investigated for quartz, limestone, a soft cement clinker and a hard cement clinker. Experiments were performed in three mills of 29.2, 40.6 and 61.0 cm diameter. The diameter of the balls used ranged from 1.27 to 3.81 cm. The particle size range covered was $\text{8}\text{10}$ to $\text{100}\text{150}$ mesh. The rate parameter values were determined very accurately using a special technique. It has been shown that the particle size exponent α in equation S_i = Ax_i^α is independent of ball and mill diameters. Based on this fact, a new correlation has been developed to describe the effect of ball and mill diameters on the rate parameters. The various constants in this correlation are strongly material dependent.     

Using the discrete element method to analyze the breakage rate in a centrifugal/vibration mill

The grinding characteristics of a centrifugal mill with varying G/D (gyration/mill diameter) ratios were investigated using the population balance model and the discrete element method (DEM). A series of grinding tests were conducted on illite samples using a centrifugal mill under various conditions, and the breakage parameters were calculated. Three-dimensional DEM simulations were also conducted. It was found that the specific rates of breakage estimated for various grinding conditions correlated well with the impact energy calculated from DEM simulations. This information was used to develop scale-up functions for the centrifugal mill in terms of G/D ratio, rotational speed, mill diameter, grinding media diameter, and ball loading.     

半终粉磨钢渣微粉生产线的设计和实践

钢渣微粉化是解决钢渣终端利用的有效途径,但采用传统粉磨工艺无法有效解决钢渣微粉生产中的除铁难题,同时也无法保证钢渣微粉产品的稳定细度和活性。采用带辊压机半终粉磨的圈流高细磨钢渣微粉粉磨工艺,可以充分发挥和利用辊压机的挤压优势和球磨机的研磨功能,达到显著改善产品性能、增产节能,又能高效除铁的效果,是当前钢渣固废利用的可靠有效方案。经优化比较和生产实践,建议在新建或改造钢渣微粉生产线时,以控制辊压机与球磨机的装机功率比在0.6~0.7,球磨机的长径比控制在3.5~4.0为宜。     

Effect of mill diameter on the rate of initial grinding in vibration ball mills

Vibration ball milling was carried out using three kinds of mills with the same internal volume but different diameters. The variations of specific surface area produced with time were investigated at a constant vibration intensity using feldspar with an initial size range of 74 – 149 μm. As a result, it was found that the specific surface area of product was markedly influenced by the difference in mill diameter even at the same vibrating conditions. According to an empirical equation proposed in a previous paper, the rate of initial grinding was also found to vary by a factor of 1.4 to 2.0, depending upon the mill used. The dependence of the rate of grinding on mill diameter can be explained by considering an effective area of mill shell capable of colliding with balls and a motion of balls in each mill. An available suggestion for designing a mill pot was obtained from this work.