不同粉磨方式下高炉矿渣粒度特征的分析比较

为了客观地评价球磨和搅拌粉磨的设备效能,并为高炉矿渣高效制备技术的开发研究提供相关的试验研究数据,采用小型球磨和搅拌磨制备不同粒度的高炉矿渣产品,对不同粉磨方式下高炉矿渣的颗粒群粒度分布特性进行分析研究。结果表明,小型球磨及搅拌磨产品的粒度分布均符合Rosin-Rammler-Bennet分布;随着粉磨时间的延长,颗粒粒径减小;搅拌磨的粉磨效率较高,其高炉矿渣产品的粒度分布较窄。     

不同粉磨方式矿渣粉对矿渣水泥流变性的影响

用激光粒度分析仪（LPS）研究了球磨和立磨粉磨的矿渣粉的粒度分布，用旋转粘度计对矿渣水泥的流变性能进行了测量。发现：球磨机所加工的矿渣粉比立磨加工的矿粉颗粒尺寸分布宽、细颗粒含量高；矿渣粉比表面积相近时，矿渣掺量在小于30%和大于40%时由球磨矿渣粉制成的矿渣水泥比立磨矿渣水泥的屈服应力和粘度小，而掺量在30%～40%之间时球磨矿渣水泥的粘度和屈服应力较立磨的稍大。此外，对矿渣粉颗粒群与水泥流变性之间进行了灰色关联分析，发现小于10μm的矿渣颗粒增加了水泥浆的屈服应力和粘度，而大于10μm矿渣颗粒却削弱了水泥浆的屈服应力和粘度。     

气流磨粉磨超细矿渣粉的粉体性能和微观形貌研究

煤炭、粉煤灰及矿渣是用于水泥生产的原料或混凝土的掺合料,而细度是影响粉体材料性能的因素之一。本文以矿渣为材料,利用JFC-5对撞式流态化床气流磨制备了超细矿渣粉,对超细矿渣粉的粉体性能和微观形貌进行了研究。研究表明,气流磨粉磨超细矿渣粉存在粉磨平衡,超细矿渣粉颗粒分布集中,分选机转速过大,得到的矿渣粉体出现团聚现象。     

β-C_2S粉磨过程的摩擦化学研究

对水泥矿物之一β-C_2S 的粉磨过程进行了摩擦化学研究,用 X 射线微观应力测定法和正电子湮没技术(PAT)测定了粉磨过程中β-C_2S 晶格畸变和结构缺陷的变化,从形变的微观机制对测试结果进行了探讨。测定了不同粉磨时间样品的比表面积,粒径分布和水化放热速率,解释了不同大小颗粒水化活性差异的原因。     

A TRIBOCHEMICAL STUDY ON THE GRINDING PROCESS OFβ-C_2S

对水泥矿物之一β-C_2S 的粉磨过程进行了摩擦化学研究,用X 射线微观应力测定法和正电子湮没技术(PAT)测定了粉磨过程中β-C_2S 晶格畸变和结构缺陷的变化,从形变的微观机制对测试结果进行了探讨。测定了不同粉磨时间样品的比表面积,粒径分布和水化放热速率,解释了不同大小颗粒水化活性差异的原因。     

助磨介质作用下旋窑熟料微细化过程的研究

研究了助磨剂作用下旋窑熟料的微细化过程。结果表明 ,助磨剂在不同粉磨阶段的作用机理不同 ,在相同的粉磨时间下助磨剂提高了粉磨细度 ,改善了物料的颗粒分布 ,改变了颗粒形貌 ,还改变了粉磨物料的微观结构 ,加剧了物料的晶格畸变、晶格缺陷及无定形化 ,加速了物料结构中化学键的破坏 ,尤其是C3S矿物中Si—O键的断裂 ,从而增加物料的反应活性     

高钛矿渣的粉磨特性研究

由于攀钢高炉渣中含有20%以上的TiO2,使其利用受到很大限制,为使高钛矿渣作为掺合材料应用于混凝土,需首先了解高钛矿渣的粉磨特性。本文中研究了粉磨时间与高钛矿渣细度之间的关系,对比了高钛矿渣与普通矿渣易磨性并分析了助磨剂对高钛矿渣粉磨的影响。结果表明,高钛矿渣的易磨性较普通矿渣差,可使用助磨剂提高高钛矿渣的粉磨效率。     

助磨介质作用下旋窑熟料微细化过程的研究

研究了助磨剂作用下旋窑熟料的微细化过程，结果表明，助磨剂在不同粉磨阶段的作用机理不同，在相同的粉磨时间下助磨剂提高了粉磨细度，改善了物料的颗粒分布，改变了颗粒形貌，还改变了粉磨物料的微观结构，加剧了物料的晶格畸变，晶格缺陷及无定形比，加速了物料结构中化学键的破坏，尤其是C3S矿物中Si-O键的断裂，从而增加物料的反应活性。     

高能球磨法制备超滤分离膜用钼铜复合粉末

研究高能球磨法制备纳米钼铜复合粉末的主要影响因素,通过扫描电镜和透射电镜分析粉末的形貌及颗粒尺寸.研究结果表明,复合粉的粒度随着球磨时间的延长而减小,但随着球磨时间增加,团聚加剧;通过重力沉降法可以去除浆体中的团聚体,从而获得颗粒分布适合的粉体,10h球磨粉沉降后粉体颗粒尺寸约为50～60nm,20h球磨粉沉降后粉体颗粒尺寸约为20～30nm.     

采用振动磨制备中药微粉

采用振动磨对三七和水蛭两种中药材进行粉磨实验,研究振动磨工艺参数对粉磨效果的影响。结果表明:水蛭的粉磨效果很好,在短时间内就能达到所要求的微粉粒度;而三七的粉磨效果较差,粉磨时间长且存在无法磨细的中间颗粒。增大磨介填充率、减少物料填充量、减小入磨粒度、增加粉磨时间都可以有效降低最终中药微粉的粒度。     

Comparison of Milling Processes: Ball Mill Versus Air Classifying Mill

Abstract

A study was initiated to compare the milling process and equivalence of mills for milling a fibrous material. In this study, milling processes using either a ball mill (Abbe Model Number 2) or an air classifying mill (Mikro ACM 10) were compared. Samples from both processes were evaluated by appropriate physical and chemical analyses such as particle size, surface area, densities, and potency. The particle size distribution and surface area analysis showed equivalence between the two milling processes. Scanning electron micrographs (SEM) showed that the samples had similar morphology. The potency of samples obtained from either of the milling processes was not affected by differences in the milling processes. In addition, results of milled samples that were subsequently granulated and compressed into tablets showed no difference in assay, content uniformity or disintegration time. Based on these results, it is concluded that the ball mill and the air classifying mill produce material that is equivalent in terms of physical and chemical properties, and therefore the processes of milling are interchangeable.     

Comparison of Milling Processes: Ball Mill Versus Air Classifying Mill

A study was initiated to compare the milling process and equivalence of mills for milling a fibrous material. In this study, milling processes using either a ball mill (Abbe Model Number 2) or an air classifying mill (Mikro ACM 10) were compared. Samples from both processes were evaluated by appropriate physical and chemical analyses such as particle size, surface area, densities, and potency. The particle size distribution and surface area analysis showed equivalence between the two milling processes. Scanning electron micrographs (SEM) showed that the samples had similar morphology. The potency of samples obtained from either of the milling processes was not affected by differences in the milling processes. In addition, results of milled samples that were subsequently granulated and compressed into tablets showed no difference in assay, content uniformity or disintegration time. Based on these results, it is concluded that the ball mill and the air classifying mill produce material that is equivalent in terms of physical and chemical properties, and therefore the processes of milling are interchangeable.     

冲击式超细粉碎机研制

本文着重介绍了冲击式超细粉碎机的结构，设计原则和在非金属矿等方面的应用实例。冲击式超细粉碎机是能够生产数十微米到数微米微细粉产品的干式粉碎机，它与其它粉磨设计相比，结构简单，单位能耗低，粉碎物料范围广，该机用于非金属矿超细粉碎，在给料粒度不大于８ｍｍ时，一次粉碎粒度１０μｍ通过率可达９０％以上。     

Failure Analysis of Mill Shaft Roll

A strip mill roll shaft failure was investigated. The investigation revealed that the fatigue strength of the shaft had been compromised by a combination of several factors that included: inadequate fillet radius size, the use of dissimilar filler materials to rebuild the shaft surface, the presence of slag inclusions at the weld/alloy interface, and machining defects on the shaft surface. Such failures have occurred repeatedly, and this paper presents a case study investigating the cause of the problem and discusses possible remedial measures to prevent similar occurrences.     

轧钢机中的自激振动问题

以前关于轧钢机中自激振动的研究,忽略了一些重要因素:例如,万向联轴节的间隙、摩擦系数是随机的以及多自由度中的零频率,内共振。本文讨论了这些问题,得到了一些新的动力学模型和结论。     

Grindability of Quartz in Stirred Media Mill

Nowadays, ultrafine grinding in the submicron particle size range is becoming an increasingly conventional process. One of the mostly used ultrafine grinding ways is the size reduction in the so called stirred media mill. This article deals with the experimental investigation of wet grinding of quartz in a stirred media mill. The applicability of the introduced operating Rittinger index and the lower limit size of Rittinger law are studied. Furthermore, the effect of solid concentration of suspension, ball filling ratio, circumferential speed of the stirrer, and size of grinding media on the fineness (median particle size and specific surface area) was examined. Additionally, a relative grindability calculated from the operating Rittinger index is introduced in order to compare the efficiency of stirred media milling. It was found that the grinding conditions greatly affect the applicability of Rittinger's law and its lower limit size.     

分级式锤式冲击磨加工石油焦粉

针对石油焦的特性与粉碎要求,对现有分级式锤式冲击磨的结构进行研究,主要对粉碎速率、锤头与轨道之间的距离、设备磨损、分级精度、收集系统稳定性及安全问题进行探讨、改进及优化,设计出LNI-660A型分级式冲击磨,通过实际加工石油焦粉的工业应用,证明了该设备锤头使用寿命高达2 400 h以上,当石油粉产品粒度d90<68.98μm时,产品达3.5 t/h以上,并且部件磨损较小,能有效地控制大颗粒,系统运行稳定。     

气流磨尾尘的超细粉碎

用气流磨加工碳化硅磨料时,约有5%-15%的物料变成了尾尘.这部分碳化硅微粉由于粒度分布范围很宽,无法直接利用.本实验研究对气流磨碳化硅尾尘用搅拌磨粉碎进行了探讨.实验研究了不同研磨时间粉尘的纯度变化;分散剂对粒度变化的影响以及不同研磨时间,微粉的粒度、粒度分布的变化关系,实验结果证明气流磨尾尘经过搅拌磨研磨可以得到分布窄、单峰的理想微细粉体;随着研磨时间的增加,粉体纯度下降;磷酸盐水分散剂可以促进研磨的进程.     

小石磨磨出大产业

小汤圆越滚越大 在陈泽民的办公桌旁,放着一台相当古旧且十分干争的民间小石磨,引起我们的好奇.陈泽民意味深情地摆弄着小石磨说:"这是我创业起家的宝贝."陈泽民祖籍四川,三岁起就跟着身为炮兵专家的父亲辗转南北.1965年从新乡医学院毕业,响应党的号召支援三线建设,在四川一个兵工厂医院工作.1978年,爱人因病调回郑州,两年后,他也回到了郑州.在四川的十几年里,夫妇俩学会了做腊肉、腌泡菜、做汤圆等手艺.逢年过节靠这盘小石磨,做出许多汤圆送给亲戚、朋友、邻居和同事,大家都说不是一般的好吃.     

气流磨粉碎颗粒分析

为了分析超细粉体颗粒冲击破碎时颗粒破碎与颗粒材料性质之间的关系,运用应力波理论及颗粒材料结构特性对气流磨粉碎进行了定性分析。采用JFC-5气流磨对8种晶体及非晶体材料进行超细粉碎,并用SSX-550电子扫描显微镜分别对8种超细粉体颗粒进行形貌观察。分析发现晶体颗粒的破碎与其晶格构造特点密切相关,被粉碎颗粒形状具有相应明显的晶体特点;非晶体颗粒的破碎则具有很大的随机性,颗粒形状无明显几何特点,无晶界可循。