Numerical investigation of monodisperse granular flow through an inclined rotating chute

A discrete element model of spherical glass particles flowing down a rotating chute is validated against high quality experimental data. The simulations are performed in a corotating frame of reference, taking into account Coriolis and centrifugal forces. In view of future extensions aimed at segregation studies of polydisperse granular flows, several validation steps are required. In particular, the influence of the interstitial gas, a sensitivity study of the collision parameters, and the effect of system rotation on particle flow is investigated. Shirsath et al. have provided the benchmark laboratory measurements of bed height and surface velocities of monodisperse granular flow down an inclined rotating chute. With a proper choice of the friction coefficients, the simulations show very good agreement with our experimental results. The effect of interstitial gas on the flow behavior is found to be relatively small for 3‐mm granular particles. © 2014 American Institute of Chemical Engineers AIChE J, 60: 3424–3441, 2014     

水利枢纽溢洪道掺气坎槽体型研究

结合糯扎渡水利枢纽溢洪道掺气减蚀模型试验研究，根据试验资料，利用回归分析，拟合出关系曲线，建立了坎高与水深、流速、溢洪道底坡、挑坎挑角关系的经验公式，并通过已建成的工程实例来验证公式的实用性．该公式对掺气坎槽选型提供了依据，可供设计与模型试验阶段参考。     

溢洪道阶梯陡槽段水面掺气位置试验与计算探讨

外凸型阶梯式消能工是应用于溢洪道陡槽段上的一种新型的辅助消能工。目前溢洪道陡槽段外凸型阶梯式消能工已在水利工程中得到了应用,但对此类型阶梯式消能工水力特性的研究成果仍较少。本文在5种坡度比和不同阶梯体型(包括阶梯高度、阶梯间距等参数)的阶梯陡槽溢洪道水力模型试验研究的基础上,对溢洪道阶梯陡槽段水力特性进行研究探讨,分析了陡槽段坡度比、阶梯跌坎体型参数等对溢洪道陡槽段泄流流态的影响,并将阶梯陡槽段泄流分为光滑水流区和掺气水流区两部分,提出了外凸型阶梯陡槽段水面掺气断面位置和水深的计算公式。本文研究成果可为溢洪道阶梯陡槽段沿程水面线和消能计算提供参考。     

攀枝花白马铁尾矿选钛工艺研究

借鉴以往试验成果,结合矿石性质,采用分级-一段磁选-螺旋溜槽重选-二段磁选-浮选新工艺对攀枝花白马选铁尾矿进行回收钛的选矿试验。经系统的条件试验,确定了各环节合适的工艺参数,最终获得了TiO2品位为46.23%、TiO2回收率为29.66%的钛精矿,同时可使原铁尾矿中残留的铁和硫得到综合回收。试验成果可作为白马铁矿建设钛选厂的技术依据。     

卡布其露天矿6~#溜井及风井降段方案研究

卡布其石灰石矿6#溜井跟其他溜井不同的是距离很近的地方有一风井。论述了"满井法"和"空井法"的优缺点,然后根据矿山实际情况应用特殊"空井法"对溜井及风井进行降段,即保证了溜井正常降段,又使风井得到安全合理的降段。     

胶带机转运点收尘环节的优化

胶带机转运点扬尘的原因主要有设备选型不合适、收尘管道设计不合理、设备和管道未做保温及清灰压缩空气影响等方面.为改善收尘效果,文章着重从收尘系统设计、设备及收尘管道选型、收尘罩设计及胶带机导料槽结构优化的几个方面来探讨一下改进措施.     

峨口铁矿放矿明溜槽爆破成形

峨口铁矿为了解决东区采场的矿石出路问题，决定增建两条放矿明溜槽。本文简述了溜槽工程地质概况，详细地介绍了溜槽的爆破成形设计方案，分析了爆破效果。     

Flow pattern, mass flow rate, pressure distribution, and temperature distribution of two-phase flow of HFC-134a inside short-tube orifices

New experimental data on the influence of short-tube orifice configuration, including diameter, length, length-to-diameter ratio (L/D), and orientation on the flow pattern, mass flow rate, and pressure distribution of HFC-134a inside the short-tube orifice are presented. Short-tube orifice diameters ranging between 0.605 and 1.2 mm with L/D ranging between 1.87 and 33 are used in the experiments. Three different forms of the metastable liquid flow, which are metastable liquid core flow, conical metastable liquid core flow, and full metastable liquid flow are visually observed. The short-tube orifice diameter has a significant effect on the increase in the flow rate. Conversely, the change in the orientation of the test section has no significant effect on the flow rate. The choke flow phenomenon disappears inside the short-tube orifice when L/D is less than 2.91. Based on the present data, a correlation for predicting the mass flow rate through short-tube orifices is proposed.     

组合式螺旋溜槽的研究

根据普通螺旋溜槽在现场应用所存在的问题及其分选机理，设计了具有粗、精、扫选组合式的新型螺旋溜槽。这种新型螺旋溜槽，粗选溜槽设置在上部，精、扫选溜槽内外相套设置在粗选溜槽下部。粗、精、扫选槽体均有不同的结构参数。用设计的新型螺旋溜槽及普通螺旋溜槽对磁铁矿──石英（粒度范围为－0．15～0）人工混合物料进行了试验对比。试验结果表明：新型螺旋溜槽的选矿效率比普通螺旋溜槽高7．1％，精矿品位高2．38％，回收率高5．47％。     

紫金山金矿高位溜井的防跑矿技术

溜井作为运输矿石途径之一。具有依靠自重溜放经济性的一面，在矿山生产中被广泛采用。文中针对紫金山露天采场溜井及溜井管理状况，分析了溜井跑矿原因，通过对溜井的跑矿危害提出防治措施，意在实际生产中能够预防跑矿事故发生，利于矿山生产，并对相应矿山生产有一定的借鉴作用。