工业球磨制备石英砂粉体球磨介质的磨损研究

球磨作为一种介质运动式粉碎工艺,广泛应用于冶金选矿、陶瓷、化工、建材等大型工业部门,在众多成本中球磨介质磨耗占据较大比例。本文采用重量法通过调整球磨参数得出球磨介质的磨耗规律。结果表明:随着球磨时间延长,介质质量不断减小;在一定范围内,随着球磨转速增加,球磨介质磨损加越快;在一定范围内,随着料球比增加,球磨介质磨损减慢;随着大小球比值增加,球磨介质磨损总量在减小,但磨损速度基本不变。当球料比为1∶0.3,大小球质量比为1∶0.5,转速为110 r/min,工业球磨石英砂粉体球磨介质的磨损预测:石英砂原矿球磨到粒径为11.25μm,球磨介质磨耗与石英砂粉体产量的磨耗约为3.17 kg/t。     

高能球磨制备纳米WC/MgO粉末的工艺研究

本文采用正交试验法,对高能行星球磨制备纳米WC-38%MgO(质量分数)复合粉末的工艺参数进行了优化研究。试验表明,当磨球直径为10mm、球磨机转速为350r/min、球料比为6:1时,最有利于WC-MgO复合粉末的细化。当球磨罐中装料量(mp=100g)一定时,理论计算和球磨实验得出的最佳球料比均为6:1。     

高能球磨法制备Fe_3O_4超细颗粒过程中转速对其性能的影响

采用高能球磨法制备水基Fe_3O_4磁性颗粒,研究了转速对其研磨效果、粘度、沉降稳定性、样品形貌及流变性能的影响。结果表明:球磨机转速对Fe_3O_4磁性颗粒悬浮液的粘度和沉降稳定性的影响很大。在相同的研磨时间内,随着转速的提高悬浮液中超细颗粒的含量增多,转速为200 r/min,球磨机对物料有很好的研磨效果;悬浮液的零场粘度先增大后减小;悬浮液的沉降率先减小后增大,沉降量是先变少后变多的过程,当球磨机转速定为200 r/min时,所得样品的稳定性最好;磁场强度低于65 mT时,在相同磁场强度下,低转速制取样品的剪切应力较大。磁场强度高于65 mT时,在相同磁场强度下,高转速制取样品的剪切应力较大。     

球磨法制备高流动性铝合金粉末技术研究

为研究球磨法制备高流动性铝合金粉末技术,以AlSi10Mg为试验原材料,采用多步球磨法制备高流动性铝合金粉末。研究结果表明,随着球磨时间的增加,铝合金粉末粒度呈先减小后增大的趋势;随着球磨转速的提升,铝合金粉末粒度整体呈下降状态;不同球料比下,铝合金粉末粒度存在较大差异。当球磨时间为16h、球磨转速为300r/min、球料比为12∶1时,能得到最佳流动性的铝合金粉末。     

正交优化纳米碳化硅粉的制备工艺参数

实验选用无水乙醇为液相介质,聚乙烯吡咯烷酮(PVP)作为修饰剂,采用高能球磨法,成功制备出分散良好的纳米碳化硅粉.通过正交实验,分析了球磨时间、碳化硅颗粒的加入量、碳化硅与修饰剂的质量比和转速4个工艺参数对纳米碳化硅粉的产率、产量和粉体的特征粒径D50的影响.结果表明在本实验条件下,制备纳米碳化硅粉的最佳工艺参数为:时间15 h,碳化硅的加入量30 g,碳化硅与修饰剂的质量比2∶1,转速300 r/min.     

高能球磨法制备纳米赤铁矿矿物颜料水分散体

以赤铁矿为原料,马来酸酐-醋酸乙烯酯共聚物PMV为分散剂,采用高能球磨法制备纳米级赤铁矿颜料水分散体,讨论了研磨时间、研磨介质以及分散剂用量等对分散体的粒径和Zeta电位的影响。结果表明,采用行星式球磨仪在球磨机转速为500 r/min,球磨时间为5 h,分散剂用量为0.25 g/g颜料,研磨介质为直径2 mm和0.5 mm锆珠的质量比为3∶2时,能获得粒径大小为230 nm的赤铁矿颜料水分散体,具有一定的粒径分散稳定性。     

行星球磨对磷酸铁锂前驱体性能的影响

采用行星球磨法制备磷酸铁锂前驱体微粉,并通过激光粒度分析仪对磷酸铁锂前驱体的粒径大小及分布进行表征。主要研究了球料比、球磨时间和球磨转速等球磨工艺对磷酸铁锂前驱体粒径大小及分布的影响。结果表明:通过行星球磨可以获得粒径为微米级别的磷酸铁锂前驱体微粉,最佳的工艺条件是球料比3∶1、球磨转速200 r/min、球磨时间10 h。     

钛精矿重选分离含硅物相影响因素研究

针对四川某钛精矿中存在的硅含量过高的问题,提出了摇床重选法分离二氧化硅的方法。通过球磨工艺获得不同粒径颗粒,然后采用摇床进行重选,研究粒径大小、粒径组分占比、冲程等因素对钛精矿含硅相的分离效果。结果表明,随着磨矿时间的增加,-200目(＜75 μm)钛精矿占比逐渐增加。当研磨时间为8 min时,-200目钛精矿的占比为83.0%(质量分数)。随着冲程的增大,SiO₂的品位和TiO₂的回收率均呈逐渐增大的趋势。当冲程为15 mm时,SiO₂的品位由2.46%(质量分数)降低至1.07%。重选分离后原矿分为三部分,TiO₂品位:钛精矿>中矿>尾矿,SiO₂品位:钛精矿<中矿<尾矿。当-200目铁精矿占比85.5%(质量分数)时,重选后SiO₂的含量最低可降至0.93%(质量分数)。     

高能球磨法制备亚微米TATB炸药

高能球磨法是对敏感炸药进行安全细化的有效方法,本文采用高能球磨法对TATB炸药进行微纳化,研究了微纳过程中影响TATB细化效果的因素,包括表面活性剂、水料比、球磨温度、转速和球磨时间;总结了高能球磨法制备超细TATB的操作技巧,如球磨罐的安装、装料量的控制、磨腔内物料降温和磨球上物料的冲洗。上述研究和总结为安全高效利用高能球磨机制备超细炸药进行了有益尝试与探索,优化条件下得到了亚微米级超细TATB炸药。     

高能球磨法制备亚微米TATB炸药

高能球磨法是对敏感炸药进行安全细化的有效方法,本文采用高能球磨法对TATB炸药进行微纳化,研究了微纳过程中影响TATB细化效果的因素,包括表面活性剂、水料比、球磨温度、转速和球磨时间;总结了高能球磨法制备超细TATB的操作技巧,如球磨罐的安装、装料量的控制、磨腔内物料降温和磨球上物料的冲洗。上述研究和总结为安全高效利用高能球磨机制备超细炸药进行了有益尝试与探索,优化条件下得到了亚微米级超细TATB炸药。     

成型方式对石英砂烧结砖性能的影响研究

利用低品位石英砂制备高性能石英砂烧结砖,通过对原料和砖体物相分析、砖体的显微结构分析以及砖体的物理性能分析,研究了成型方式对砖体性能的影响。结果表明:等静压成型的压力比手压成型的大得多,使得坯体内部气孔数量少且孔径小,有利烧结。等静压成型所制备的砖体抗压强度(34.8MPa)比可塑(手压)成型的砖体抗压强度(19.5MPa)高得多,但与烧结砖的国家标准相比,两种成型方式的烧结砖各种性能都达到标准。     

锆英砂球磨过程中颗粒分布的分形研究

测定了球磨不同时间后锆英砂的粒度分布,计算了其分形维数,并结合颗粒形貌的观察,对球磨过程中粉料的破碎行为做了研究,结果表明：当球磨时间较短时,椭球形原砂被破碎为具有尖锐边角的不规则形状,降低了进一步破碎的难度,破碎效率提高,因此分形维数不断增大;但随着颗粒的细化及其含量的增加,不但自身破碎的难度逐渐增加,而且阻碍了粗颗粒的破碎,故球磨更长时间后分形维数增大的趋势趋缓;同时,锆英砂球磨过程中不同粒度颗粒破碎的难度存在差异,导致随分形维数上升,颗粒分布的离散度快速上升,不利于双峰级配粉的制备。     

The effect of interstitial gas on milling. Part 2

In a previous paper results were presented on the effect of interstitial gas on the milling characteristics of one specific fine powder in a ball mill. This second paper gives more data on two other powders, cracking catalyst and hematite, together with those on the powder used in the earlier experiments, quartz sand. The effects found are similar for each of the three powders: increasing gas pressure or viscosity of the gas or both inside the mill increases the rate of breakage and decreases the fineness of the daughter particles of a milling event. The overall milling speed or production rate as well as the ultimate fineness of the product are both improved by increasing pressure or viscosity.On the basis of these results a comparison is made with wet milling. It appears that pressurized milling, pressure around 10 bar, is a good alternative for the milling of fine powders.     

Effect of planetary ball milling on phase transformation of a silica-rich iron ore

The phase transformation of a silica-rich iron ore during planetary milling has been studied. A mixture of silica-rich low grade iron ore and iron powder (4.75 wt.%) was subjected to high energy ball milling and the resulting products were characterized at various milling times. The major constituents of the silica-rich iron ore are hematite (54.2%) and quartz (44.6%). Upon milling, these phases have undergone phase transformation to form fayalite (Fe₂SiO₄) as the major phase along with unreacted quartz as the minor phase. X-ray and Mössbauer spectroscopy studies confirmed the formation of fayalite phase. It was observed that the optimal constitution of the product, in which fayalite is the major phase, could be attained within 15 h of milling.     

石英砂的塑性机理研究

研究了石英砂的塑性并对其进行改善,得出石英砂颗粒大小、砖坯含水率、砖坯p H值和增塑剂含量对砖坯塑性的影响规律及机理,并且为利用石英砂而采用可塑成型去制备高性能的烧结砖探索出了合适的成型工艺条件:球磨时间24h、含水率为29%、坯料p H=9和增塑剂含量为5%。     

大规格球磨机球磨釉料的探讨

8吨球磨机应用氧化铝刚玉质异形砖与普通瓷质砖砌筑成具有过渡圆角及不连续螺旋的新结构内衬（以下简称为新内衬），在广东某大型企业的生产线上球磨陶瓷耐磨地砖釉料，并就釉料颗粒大小及粒度分布、电耗、介质磨耗等与1．5吨球磨机进行对比，进行了实验研究。结果表明：配有新内衬的8吨球磨机可磨出颗粒较小、粒度分布较窄的质量好的釉料，且具有好的经济效益；在墙地砖大批量生产的条件下，采用新内衬的8吨等大规格球磨机替代1．5吨球磨机球磨普通釉料切实可行。     

Effect of high-energy ball milling on the microstructure and properties of ultrafine gradient cemented carbides

Planetary low-temperature high-energy ball mill was used for preparing the mixed powders with different particle sizes by adjusting the milling time. The ultrafine grain gradient cemented carbides were prepared by sinter-HIP treatment. The effects of milling time on the gradient formation, grain growth, and mechanical properties of ultrafine grain gradient cemented carbides were investigated. The results show that the high-energy ball milling cannot effectively reduce the particle size of mixed powder with short milling time. In addition, the particle size of the mixed powder is significantly reduced, while the specific surface area is significantly increased when the ball milling time exceeds 25 hours. The gradient layer thickness and the grain size increase at the beginning and then decrease when the mixed powder particle size was decreased. Simultaneously, the density, hardness, and fracture toughness of the alloy increase gradually. On the contrary, the number of WC with abnormal grain growth is significantly increased. The thickness of the gradient layer reached 32 μm, and the mean WC grain size is 314 nm. Based on the analyzed results, an optimized gradient layer thickness, grain size, density, and hardness can be obtained when the ball milling time is 35 hours.     

原料颗粒级配对玻璃配合料混合均匀性的影响

研究了砂岩,白云石,石灰石的粒度分布的变化对玻璃配合混合均匀性的影响。结果表明：砂岩中２００目以下细粉含量的增加将降低配合料的均匀性,而减少砂岩中４０目以上的粒子可提高配合料的均匀性。白云石与石灰石粒度的增大会明显降低混合的均匀性。根据所研究的结果,笔者提出了与我国实际情况较适合的砂岩,白云石和石灰石原料间颗粒级配的建议。     

Anisotropic Grain Growth in Mullite Powders as a Result of High-energy Ball Milling

High-energy ball milling was applied to a commercial mullite powder, which had a particle size ranging from 2 to 10 μm, and was considerably refined to be <1 μm after milling for 10 h. Anisotropic grain growth of mullite was observed in the milled mullite powder, starting at relatively low temperatures (1200°C). The anisotropic grain growth was possibly attributed to the special anisotropic structure of mullite and refined mullite powder as a result of the high-energy ball milling, although other factors, such as lattice defects, localized stress of the milled powder, and impurities or contaminations caused by the high-energy milling also could be factors. This anisotropic grain growth of mullite might be useful in the fabrication of reinforced ceramics based on mullite and other materials.     

水胶比对再生砖粉ECC工作性能和力学性能的影响

利用再生砖粉全取代石英砂制备工程用水泥基复合材料(ECC),深入研究和分析了材料的工作性能和力学性能,利用扫描电镜技术对相关机理进行了探讨。研究表明:水胶比变化范围在0.30~0.39(质量比,下同)时,再生砖粉ECC拌合物的坍落度均在200 mm以上,工作性能良好;水胶比相同的情况下,用再生砖粉取代石英砂后,ECC的力学性能有所下降;水胶比变化范围在0.30~0.37时,再生砖粉ECC的抗折强度随水胶比的增大而增大,水胶比变化范围在0.30~0.39时,再生砖粉ECC的抗压强度随水胶比的增大而减小;各组再生砖粉ECC均表现出良好的应变硬化特征,呈现多缝开裂状态,且极限应变均大于2%。在本文试验条件下,水胶比为0.37时再生砖粉ECC的弯曲性能和单轴拉伸性能最佳。