高压水射流粉碎矿物的机理研究

前混合式高压水射流粉碎是水射流粉碎的一种重要方法,分析和实验研究表明：加入到高压水中的物料颗粒在受到高的静水压力后以高速射出,使积聚在颗粒中的弹性应变能迅速释放,进而使颗粒粉碎,因此压力释放效应是高压水射流粉碎的一个重要机理。     

气流磨制备磷渣超细粉的研究

研究利用气流磨制备磷渣超细粉。研究结果表明,磷渣试样的比表面积随气流磨料流速度的增加而减小,随入磨气压的增加或粉碎气压的增加而增大。在料流速度为5 g/s、入磨气压为0.75 MPa、粉碎气压为0.70 MPa条件下,制备的磷渣超细粉的比表面积达到859 m²/kg、特征粒径达到5.91 μm。     

白云石的超细气流粉碎与分级加工

采用扁平式超细气流粉碎机与超细离心式空气分级机组成的闭路系统对白云石进行超细加工,分析了操作参数对产品粒径的影响。     

高压水除鳞喷嘴射流边界的分析

目前国内多把除鳞喷嘴的高压水射流边界当作直线来进行估测,但实验数据表明由此计算出来的轧制方向射流宽度与实际值的差距比较大。从垂直喷射高度H与轧制方向射流宽度L的试验拟合曲线可知,射流边界近似为抛物线。     

反应釜高压水射流清洗设备研制

根据反应釜的结构特点设计出了合适的清洗设备.设备中三维旋转喷头伸缩机构和三维旋转喷头的合成运动保证了高压水射流可以覆盖反应釡内任何位置,完成对反应釜的清洗,并在应用中得到了较好的效果.     

Prediction of particle size distribution of dronedarone hydrochloride in spiral jet mill using design of experiments

In pharmaceutical industry, micronization is used to achieve solubility enhancement through the increase in specific surface area, and finally improving the dissolution rate of the drug. Industrial application of micronization is mostly based on experience and trial and error method. This research deals with the micronization of dronedarone hydrochloride and the path for evaluation of characteristics of micronized drug. Micronization was performed in laboratory spiral jet mill and the samples were analyzed to determine particle size distribution, span of distribution, sphericity, shape, and specific surface area. Results were analyzed using analysis of variance and in terms of specific energy consumption. Paths for evaluation of particle size and span of distribution were proposed and good correlation between experimental and model results was achieved.     

变频调速在气流磨微粉生产线中的应用

采用变频控制技术,控制流化床气流磨的分级机转速,可以确保微粉生产线产品质量。     

热压缩空气在气流粉碎中的应用及其加料器喷嘴设计

热压缩空气、冷压缩空气与过热蒸汽作为气流粉碎机的工作介质有各自不同的内在特性,通过比较,明确了热压缩空气的不同之处,为工程中的实际选择提供了依据.并对以热压缩空气为工作介质的气流粉碎机加料器喷嘴的设计方法作了较为详细的研究.     

Ultrafine comminution of dental glass in a stirred media mill

A systematic study on the comminution of amorphous glass particles with complex composition (seven constituents) to produce nanoparticles has been performed in a high-energy stirred media mill. The influence of solids loading, dispersion stabilisation via pH and addition of dispersants on particle size was investigated in aqueous suspensions. Further, the effect of using 2-propanol and benzyl alcohol as dispersion media on the particle size and morphology is presented and compared to the aqueous system. The specific surface area of the product powder was analysed by the BET method, the secondary particle size was determined by static light scattering and the morphology was investigated by SEM and TEM. Dispersion viscosity and stability was measured using rotational viscosimetry and zeta-potential measurements, respectively. The results show that the solids loading plays a central role in the comminution efficiency, where lower loadings lead to finer particles after a given milling time. Stabilisation of the aqueous powder dispersion by adjusting the pH or by adding a dispersant did not result in an enhanced milling efficiency in terms of fast reduction of the particle size. The smallest glass nanoparticles with a primary particle size were achieved by a two-step comminution process. The particles were irregularly shaped when milled in water, however, when processed in 2-propanol and benzyl alcohol, they had a plate-like geometry.     

高压水射流清洗污垢时的机理及参数

根据污垢的成分和特点，结合高压水射流冲蚀岩石的破碎机理，分析了两类典型污垢的破碎机理，给出了高压水射流清洗污垢的部分技术参数     

Parameter effects on dry fine pulverization of alumina particles in a fluidized bed opposed jet mill

The paper presents the experimental results on dry fine pulverization of alumina particles in a fluidized bed opposed jet mill. The effect of operating parameters (i.e., feed load, inlet air pressure and the distance between nozzle outlet and jet meeting point) on the grinding results was investigated in detail. The breakage behaviors of alumina particles with respect to the effects of different parameters were discussed via the selection and breakage functions calculated by the first Kapur function method. In addition, the product size distributions could be simulated by a proposed model.     

高压辊磨机在铁矿石加工中的应用

高压辊磨机因其在使用过程中可以省掉磨碎前的中细碎设备,而且可以不设中间矿仓,以及与其他粉碎设备配用可实现整个系统的最佳粉碎效果,所以其在铁矿石加工中的应用快速增长。本文介绍了高压辊磨机在铁矿石加工中的应用与选型,说明正确认识高压辊磨机的加工性能并采用合适的参数进行选型,可优化现有铁矿石加工工艺流程,达到节能降耗的效果。     

高压水射流清洗及喷砂设备的研究分析

高压水射流技术作为近30年来发展起来的一门新技术,因其高效、节能、无污染等优点,在各行业得到了广泛的应用。文章结合具体项目,首先阐述了高压水射流技术的原理及相关参数,然后介绍了高压水射流系统的组成,最后对系统的设计进行了详细说明。     

高压水射流清洗机射流打击力的研究分析

水射流打击力是影响高压水射流清洗机清洗效果的重要因素之一,在一定程度上决定了高压水射流清洗机的清洗质量.本文主要从理论上对高压水射流清洗机的射流打击力进行了分析.     

高压水射流技术在清洗钻杆中的应用

在尾管固井、处理井下事故,如堵漏、打底塞、填井等工艺过程中,水泥浆在钻杆中凝固而导致钻杆堵塞时有发生。传统的处理方法是将这些堵塞的钻杆报废,结果造成很大的浪费。在系统研究高压水射流流动规律和动力特性基础上,针对不同喷嘴角度和喷射压力进行研究,找出最合适的角度和压力,根据不同使用条件和适用对象,对水射流参数进行了调整,对钻头切削齿和喷嘴布置进行合理的设计。研究了一项高压水射流处理水泥堵塞钻杆新技术,设计制造了清洗堵塞钻杆的专用设备和工具,现场实验取得了显著效果。     

大直径地下敷设管道高压水射流清洗工艺的研究

介绍了直径为７２０ ｍ ｍ 、井口间距２００ ｍ 的地下敷设管道内壁用高压水射流清洗除垢,并将清下的锈垢吹扫到井口、提升到地面上来的新工艺．现场试验表明：该工艺对其他工况类似的管道清洗具有一定意义     

高压水射流清洗技术在核蒸汽发生器清洗中的应用

介绍了高压水射流清洗技术在核电站的应用特点,以及高压水射流清洗技术在我国各核电站的应用情况,并指出今后高压水射流清洗技术在该领域发展的方向。     

高压水清洗深井新工艺及装备的研究开发

阐述了利用高压水清洗深井筛管上的锈垢的旋转喷头及打捞深井井底沉积物的装置,并采用新工艺,既可解决深井清洗的难题,又可使沉淀在深井井底的沉积物被打捞到地面上来．对于超过１００ｍ以上的深井的清洗具有特别重要的意义．     

Preparation of high solid loading titania suspension in gelcasting using modified boiling rice extract (MBRE) as binder

Preparation of high solid loading homogeneous titania suspension using modified boiling rice extract (BRE) as consolidator (network-former)/binder for gelcasting application has been investigated. To achieve in situ consolidation forming of TiO₂ ceramic, the gel network formed by swelling and gelatinization of the modified BRE (MBRE) with 2-hydroxyethylmethacrylate was studied. The dispersion behaviour of the titania powder and rheology of the suspension under the influence of binder content, dispersant (Darvan 821A) concentration and pH of the dispersing media have been discussed. The present process of gel casting deals with 50-80 weight% solid loading of titania particles with MBRE (2-10 weight% to that of total solid loading) in presence of dispersant (ammonium salt of polyacrylic acid [(C₄H₅O₂-NH₄⁺)n]). The influence of BRE concentration and solid particle loading on rheological properties of aqueous titania suspensions has been analyzed under steady and oscillatory shear conditions. Thermogravimetry (TG) and differential thermal analysis (DTA) on gelcast green body has been evaluated and analyzed. The characterization of green and sintered body has been done with respect to density, porosity and microstructure.