吡丙醚系列悬浮剂自动化加工工艺研究

研究釡内剪切机形式、在线剪切、砂磨机锆珠填充率、砂磨机物料流量等参数对吡丙醚系列悬浮剂的粒径影响。结果表明,高剪切有助于快速降低粒径,在线剪切有助于改善粒径分布范围,达到均质的目的。研究吡丙醚系列悬浮剂的最佳锆珠填充率及砂磨物料流量,确定吡丙醚系列悬浮剂的最佳生产工艺条件。     

研磨设备和工艺参数对氧化锆粉体粒度的影响

为了研究不同研磨设备及研磨工艺参数对粉体团聚体的解聚效果,以d50=1.355μm的氧化锆粉体为研究对象,研究了研磨设备和工艺参数对氧化锆料浆粒度的影响。首先,分别采用立式球磨机、立式珠磨机和卧式砂磨机为研磨设备,以φ2 mm的氧化锆球作为研磨介质,以m介质∶m物料=5∶1的介质物料比研磨15 h后,检测研磨后氧化锆料浆的粒度。结果表明,卧式砂磨机的研磨效果最优,研磨后氧化锆料浆的d50=0.303μm。然后,采用卧式砂磨机为研磨设备,以φ2 mm的氧化锆球作为研磨介质,选择介质物料比(m介质∶m物料)、料浆固含量(w)、线速度和研磨时间作为试验因素,进行四因素三水平(m介质∶m物料分别为4∶1、5∶1和6∶1,料浆固含量(w)分别为35%、45%和55%,线速度分别为5、10和15 m·s-1,研磨时间分别为20、25和30 h)正交试验,检测研磨后氧化锆料浆的粒度。结果表明:采用卧式砂磨机为研磨设备,当介质物料比(m介质∶m物料)为4∶1,料浆固含量(w)为45%,线速度为10 m·s-1,研磨时间为25 h时,研磨效果最佳,研磨后氧化锆料浆的d50约为0.3μm。     

分散染料后处理工艺对粒径影响研究

本文着重研究了分散红玉S-5BL在实验室和生产用砂磨机中,砂磨工艺各参数以及后处理工艺条件对粒径及其分布的影响,探讨了砂磨工艺条件对粒径及其分布的关系.     

水性悬浮体系的工艺探讨

水悬浮体系的制备过程中,立式砂磨机和卧式砂磨机是目前普遍使用的关键设备,其加工过程对产品的储存物理稳定性影响很大。为了研究了这两类砂磨机和研磨时间对悬浮体系研磨效率及贮存物理稳定性的影响,我们进行了一系列实验对比,结果表明,通过延长研磨时间,可以降低悬浮体系中颗粒的平均粒径和粒径分布（粒径〈3μm的百分比）,提高悬浮体系粘度,从而改善悬浮体系的物理稳定性。在相同条件下,卧式砂磨机的研磨效率比立式砂磨机的要高。     

锆珠在分散,还原染料研磨中的应用试验

奉试验采用上海东展国际贸易有限公司提供的以色列瑞米公司产中1.8～2.0mm锆珠(以下简称锆珠)与浙江天台山玻璃厂产中2.5～3.0mm强化玻璃珠(以下简称玻璃珠)。这两种不同的研磨介质,在同染料、同扩散剂、同染料助剂比、同研磨介质物科比、同磨浆含固量、使用同种仿生产用砂磨锅小型设备的情况下,对锆珠和玻璃珠在分散、还原染料研磨中的性能进行了对比。通过对研磨浆的pH值、研磨浆的粘度、珠沾色、珠的磨损、研磨效率、研磨效果这6个方面的性能比较。得出初步结论。     

分散染料后处理工艺对粒径影响研究

本文着重研究了分散红斑Ｓ－５ＢＬ在实验室和生产用砂磨机中，砂磨工艺各参数以及后处理工艺条件对粒径及其分布的影响，探讨了砂磨工艺条件对粒径及其分布的关系。     

钛白卧式砂磨研究

以湿球磨钛白初品为原料,利用卧式砂磨机研究了不同砂磨工艺对浆料粒度的影响,并考察了浆料不同粒度对其白度和水分散性的影响.实验结果表明:较优的砂磨工艺为砂磨转速3000 r/min,锆珠粒径1.8 mm,进料浓度410 g/L,进料泵转速l,填充率80％;在较优条件下实验室一级砂磨后的浆料中值粒径相对现场两级砂磨浆料降低了36 nm;粒度越小,浆料水分散性越好,当浆料中值粒径为231 nm时,水分散性达到99.3％,浆料不同粒度对白度基本没有影响.实验结果对生产现场砂磨能够提供重要的理论及技术支撑.     

研磨工艺对颜料分散液性能的影响研究

颜料分散法是生产彩色滤光片的主要方法,通过将颜料均一、稳定地分散在溶剂体系中,再加入单体与光引发剂配成彩色光刻胶。颜料的分散需借助砂磨机完成,砂磨机的各项参数对颜料分散液的性能影响已成为当下研究的热点。探究了砂磨机转速、研磨珠大小、研磨介质填充量、溶剂添加方式以及研磨温度对颜料分散液性能的影响。实验发现,砂磨机转速在2 000 rpm时研磨效果较好,研磨珠越小,颜料分散液的平均粒径越小,研磨介质的最佳填充量为70%,研磨过程中溶剂应分批次加入,研磨温度应设定在20℃。     

不同研磨料介质在砂磨机中的研磨效果

砂磨机依靠圆周速度约为10m/s的高速旋转叶轮激烈地搅拌砂磨机中的珠状研磨介质和漆浆,产生强有力的剪切作用,使颜料分散到漆料之中,制成细度符合要求的涂料。因此在涂料的生产过程中,砂磨机中选用何种研磨介质甚为重要。研磨介质的研磨效果与其成份、密度、粒径和强度等因素有关。本文着重介绍三种不同成份研磨介质的分散效果。     

5%氟虫脲悬浮剂配方的研究

通过正交试验优化法得到5%氟虫脲悬浮剂的最佳配方:5.2%氟虫脲原药(97%)、2.5%7227-A、2.5%DISPERSE-1005、4.0%尿素、1.5%黄原胶+硅酸镁铝(质量比1∶9)、0.3%消泡剂Tanaform AF,蒸馏水补足至100%。加工工艺研究发现:使用立式砂磨机,锆珠的最佳用量(体积)是制剂质量的1.7倍,最佳研磨时间为2 h。该制剂各项指标均符合悬浮剂的要求。     

纳米磷酸锌的可控合成

在氧化锌、磷酸固-液反应体系中,以研磨反应代替搅拌反应,辅助表面活性剂对磷酸锌的颗粒尺寸进行可控合成,考察了研磨介质、磨球比例、球料比、固液比、表面活性剂等工艺条件对磷酸锌粒径分布、形貌及团聚状况的影响,并采用SEM、XRD、粒度分布和TEM对纳米磷酸锌做了表征。结果表明,表面活性剂CTAB浓度为9×10^-4 mol/L、研磨时间为3 h、锆球为研磨介质、球料质量比为150:1、Φ10 mm与Φ6 mm磨球质量比为1:4、转速为200 r/min、固液比[氧化锌和（磷酸+表面活性剂）的质量比]为1:1时,可以制备粒径分布为59~79 nm、平均粒径为68 nm、无团聚的粒状纳米磷酸锌。     

OPTIMIZATION OF OPERATING VARIABLES FOR PRODUCTION OF NANOPARTICLES USING RESPONSE SURFACE MODELING

The objective of this study is to investigate the effect of operating parameters such as ball loading (J), solid mass fraction (C_m), pH of the suspension, and grinding time (t) on particle size distribution for the production of nano mineral particles in a stirred ball mill using response surface modeling. The particle size is arrived at by the method of Rosin-Rammler-Bennett distribution rather than by the average diameter method. Box-Behnken design is employed to arrive at the number of trials required. The results obtained show that particle size decreased with the increase in ball loading, pH, and grinding time, but not solid mass fraction. Moreover, optimum (i.e., minimum particle size) value of pH and solid mass fraction is found to be 12 and 0.3 respectively for the studied material, silica.     

Study of the process of stirred ball milling of poorly water soluble organic products using factorial design

The objective of this work was to investigate the mechanism of very fine grinding in a wet ball mill as a function of process parameters, i.e. rotation speed of the mill and grinding medium bead size. The ball mill used was a Dynomill and the grinding medium consisted of zirconium oxide beads. The product is a poorly water-soluble organic compound. Laser diffraction was used to analyze the particle size distribution.During grinding the average particle diameter of the product was reduced to a minimum size, which was constant within the range of tested operating conditions.The grinding parameters were studied to control the grinding process with respect to the required grinding time for reaching the minimum particle size and wear of the set-up.The grinding time was strongly dependent on the grinding medium bead size and on the rotation speed. The grinding process became faster when the rotation speed increased and the grinding medium bead size decreased. The wear of the set-up, and therefore the contamination of the final product with heavy metals, strongly increased with the rotation speed. A similar trend was observed with an increase of grinding medium bead size. The degradation rate of the product was not significant in the range of grinding parameters studied.     

Fabrication of Fine AlN Particles by Pulverizing with Very Small ZrO2 Beads

Nano-sized aluminum nitride (AlN) powders can enhance the sinterability of AlN ceramics. The present work examined the pulverization and dispersion of AlN powder using ZrO₂ beads of 0.1 mm in diameter as grinding medium in order to obtain nano-sized powder for low-temperature sintering. An attracting feature of the bead grinding is that the rotor creates centrifugal and shearing forces, which lead to efficient pulverization that exceeds the conventional grinding limit. The AlN powder with agglomerates and average particle size of 0.38 μm was broken up into more homogeneous particles with a narrow particle size distribution after 90 min of grinding. Qualitative examinations of the powder by transmission electron microscopy and BET indicated that the particle size was 50–100 nm and specific surface area was 70 m²/g.     

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TiO2和微米SiO2改性及分散性能的研究

采用不同的分散工艺和改性剂对纳米TiO2和微米SiO2粉体进行处理,使用激光粒度仪、红外光谱(IR)、热失重(TG)等手段对粉体粒径,粉体表面结构进行表征,探讨了超微粉体在乙二醇(EG)中分散的最佳工艺.结果表明:钛酸酯偶联剂(NDZ-201)可在纳米TiO2表面接枝,接枝率约为6%;硅烷偶联剂(KH570)可在微米S...     

机械力活化对铁尾矿活化性能的影响研究

通过机械粉磨时间对铁尾矿粉密度、比表面积、颗粒分布以及微观形貌影响研究得出：随着粉磨时间的延长,铁尾矿粉颗粒逐渐被细化,密度先减后增,比表面积先增后减;粉磨2 h时,比表面积达到最大值770 m2／kg,粒径（5±2）μm的颗粒含量约为40％,且小于5．13μm的颗粒累积含量最高,但过度粉磨会有弱团聚现象;通过研究机械力活化对铁尾矿粉活性的影响以及红外光谱（ IR）分析得出：粉磨2 h的铁尾矿粉在10％～50％掺量下,其3 d、7 d、28 d抗折强度比与活性指数均为最大值,该粉磨时间下最大程度的活化了铁尾矿粉;机械粉磨细化作用使颗粒无序化物质增多,致使活性提高。     

Size and shape characterization of conventionally and cryogenically ground turmeric (Curcuma domestica) particles

Turmeric (Curcuma domestica) powder was produced by conventional grinding and cryogenic grinding processes. The particle size and shape analyses of the ground particles were carried out, utilizing the measurement system based on time-of-transition (TOT) principle. Weight mean diameter of cryo-ground particles are 50-μm finer than conventional-ground turmeric. The size distribution in both grinding methods followed the well known Rosin–Rammler–Bennett (RRB) equation. The shape parameters of the particles of both grinding processes such as perimeter, shape factor (sphericity), average Ferret diameter, aspect ratio were measured. The shape parameters of cryo-ground turmeric were in the lower range than those of conventionally ground turmeric. The analysis confirms the usefulness of cryo-ground process in producing finer particles for heat-sensitive materials such as turmeric.     

球形木质素珠体的制备及其粒径分布研究

利用反相悬浮聚合技术制备球形木质素珠体,并采用正交实验综合研究了木质素珠体研制过程中各影响因素对珠体形成和粒径分布的影响。结果表明,以自制的复合分散剂L1, 采用体积比为1∶1的变压器油与氯苯混合物作为分散相,油水相比为3∶1,搅拌速度为200 r/min,反应温度80℃左右,反应体系的酸度控制在1.5 mol/L时,反应2 h后所得到的球形木质素珠体粒径分布最均匀,粒径在0.4~0.8 mm的木质素珠体占木质素珠体总质量的83.2%。     

高浓度料浆制备磨矿特性研究

为优化高浓度料浆制备技术,在实验室高浓度料浆制备的基础上,采用两级磨矿工艺,进行了料浆粒度分布和磨矿单位能耗的研究。实验结果表明:第一级磨矿时间19 min时,粒径<45μm的煤粒质量分数约为95%,能耗16.0 kWh/t;第二级磨矿时间35 min时,粒径<20μm的煤粒质量分数约为95%,能耗36.0 kWh/t。两级磨矿均可得到符合要求的粒度分布,研磨过程中得到的相关参数可为工业化应用提供基础设计依据参考。