浮选柱的结构及其发展

浮选柱具有结构简单，节能，投资少，流程简单等优点，有与机械搅拌浮选机竞争的能力．近年来，国内外对浮选柱的研究和应用日益增多。出现了一些新型的浮选柱。     

新结构浮选柱的试验研究

作者分析了浮选柱分选特征及所存在的严重问题,详细地阐述了新结构浮选柱的结构特征,并示出了部分试验结果。试验表明,新结构浮选柱优于传统浮选柱,放大效应小;半工业性新结构浮选柱与实验室新结构浮选柱的选别效果相当;新结构浮选柱中增设预矿化器和微泡发生器可使浮选效果大为改善。     

钢管纤维混凝土短柱轴压承载力计算分析

钢管钢纤维高强混凝土柱是一种新型的结构.普通钢管混凝土短柱的承载力计算公式不能满足钢管钢纤维高强混凝土短柱的需要.在对7根钢管钢纤维高强混凝土短柱和3根钢管高强混凝土短柱试验的基础上,对其承载力进行了理论分析.推导了钢管钢纤维高强混凝土短柱极限承载力的理论计算公式,对其影响因素进行了分析,给出了钢管钢纤维高强混凝土短柱极限承载力的简化计算公式.公式的计算结果与试验结果吻合较好,可供工程设计参考.     

浮选柱反浮选胶磷矿的影响因素

浮选柱是一种高效的细粒物料分选设备,但应用于胶磷矿浮选仍然受诸多因素制约.为考查浮选柱结构特征、工作参数和操作条件等因素对其分选效果的影响,采用试验室浮选柱对贵州瓮安磷矿进行了单一反浮选试验,重点研究了矿浆浓度、药剂用量、筛板充填方式和充气量对浮选柱反浮选效果的影响.结果表明,在磨矿细度为-0.074 mm占88％、矿浆浓度为25％（质量分数）、油酸钠用量为1.8 kg/t、硫酸用量为5 kg/t和充气量为400 L/h时,反浮选的分选效果较好.由于浮选柱可以通过充填筛板来改善其分选环境,因此在较优条件下,其分选效率比用浮选机时高1.57％.     

外包H型钢混凝土轴压短柱的受力性能

提出了一种新型外包钢混凝土组合结构形式,即外包H型钢混凝土组合柱.通过对这种组合短柱在轴心压力作用下的全过程分析,分析了影响其极限承载力的因素,并与型钢混凝土轴压短柱进行了对比,得出了这种组合柱的一些优点.     

复合型石墨浮选剂选矿试验研究

介绍了一种新型的复合型石墨浮选剂的合成及其浮选效果的试验研究，该浮选剂用于代替常用的捕收剂和起泡剂浮选石墨，使产品的品位由８５％提高到９３％，回收率由６５％提高到８５％。     

十字形截面钢骨混凝土异形柱单向偏压试验

目的设计一种新型十字形截面钢骨混凝土异型柱,研究其受力性能及破坏机理.方法对3根含钢率不同的十字形截面钢骨混凝土异形短柱和1根无钢骨的十字形截面普通混凝土异形柱进行单向偏压试验.结果十字形截面钢骨混凝土异型柱的承载力要比无钢骨的普通钢筋混凝土异形柱的承载力平均高出54%,随着含钢率的增大,构件的承载力及延性相应增加.结论十字形截面钢骨混凝土异形柱中的钢骨与混凝土能够较好的共同工作直至破坏,这种新型十字形截面钢骨混凝土异型柱为组合结构的发展提供了一种新的结构形式.     

碳纤维布对钢筋混凝土短柱抗震性能改善效果的研究

系统介绍了几种改善钢筋混凝土短柱抗震性能的方法，重点研究了一种新方法，即使用碳纤维布横向包裹钢筋混凝土短柱，改善短柱受力性能和变形性能，并对其作用机理进行了分析。     

用胶质气体泡沫从废水中浮选Cu(Ⅱ)的实验研究

采用胶质气体泡沫作为浮选载体对含Cu(Ⅱ)模拟废水进行了浮选分离实验．在浮选柱中装入特定浓度的含Cu(Ⅱ)模拟废水，用表面活性荆十二烷基磺酸钠(SDS)制备胶质气体泡沫，将胶质气体泡沫引入到浮选柱，然后通入压缩空气形成常规柱浮选气泡完成浮选过程．此外，还考察了pH值、SDS用量和Cu(Ⅱ))初始浓度对分选效果的影响．实验结果表明，采用胶质气体泡沫和常规柱浮选结合的方法对含Cu(Ⅱ)模拟废水的铜离子去除率可达99％以上。     

钢骨高强混凝土T形短柱偏心受压的试验

目的 设计一种新型实腹式钢骨混凝土T形柱,研究不同含钢率对钢骨混凝土T形柱正截面承载力的影响.方法 对3根钢骨高强混凝土T形短柱和1根钢筋高强混凝土T形短柱在偏心作用下的力学性能进行了试验研究,分析了不同含钢率对承载力的主要影响,得出了相应的关系曲线.结果 钢骨高强混凝土T形短柱的承载力一般比不加钢骨的钢筋高强混凝土T形柱提高20%～34%.结论 实验表明,在异形柱中加入钢骨对异形柱的承载力有很大的提高,这种新型实腹式钢骨混凝土T型柱可以在工程中使用.     

Separation of Oil from Wastewater by Column Flotation

A new type of device, a dissolved-air flotation column, was developed for separation of oily wastewater.The unique design idea of the dissolved-air flotation column is the combined use of dissolved-air flotation and column flotation.The dissolved air release occurred within the column separation system.As a potential application the column was investigated for its performance in separating emulsified oil droplets in oily wastewater.A high separation efficiency was obtained in a series of tests.The aeration performance of the bubble generator used in the dissolved-air flotation column was also studied in particular.     

Treatment of Wastewater Containing Heavy Metals Using Dissolved Air Released Flotation Column

A new type of dissolved air released flotation column is developed to treat wastewater containing Cr（Ⅵ） based on advantages of both dissolved air floatation and column floatation. By using a column with a diameter of 50 mm and a specially made dissolved air releaser, micro-bubbles inside the column can be formed. N2H4H2O was used as reductant, AlCl3 as flocculant, C12H25SO3Na（SDS） as surfactant in the experiment. The effects of pH of wastewater, pressure of dissolved air, ratio of return water, and concentration of flocculant and surfactant on the removal efficiency are studied. The results show that the efficiency of dissolved air released flotation column is much higher than that of other approaches after the operation parameters are optimized, with the reduction ratio of Cr（Ⅵ ） in wastewater reaching 98%. So this technique can be widely used in wastewater treatment     

A honeycomb-tube packing medium and its application to column flotation

We address problems in the development of large-scale flotation columns that use short cylinders. As a starting point, we investigated the packing medium to identify a highly efficient internal packing for the flotation column. The chosen packing was a honeycomb structure with an aperture diameter of 80 mm, a web thickness of 0.80 mm, a film height of 1000 mm, packed into a 400 mm diameter space, which completely filled the vessel at optimal cost. The column consisted of a modular ring of single-hole hexagonal honeycomb tube packing made from atactic polyproplene (PP-R). The packing was tested in a cyclonic, static mi-cro-bubble flotation column. Computational fluid dynamic modeling was used to analyze the flotation fluid in a honeycomb tube packed flotation column. Our results show that the fluid axial movement was maximized and that the transverse fluid velocities were zero in the vicinity of axial flow. Using the honeycomb tube packing for copper sulfide flotation we observed that the average concentration in the product was increased to 25.41%, from an average feed concentration of 0.729%, with an average recovery of 92.92%. The demands of on-site industrial production were met.     

Research on Pressure Drop Performance of the Packing-Flotation Column

A packing-flotation column was proposed to optimize the flotation environment A research system was established using a 100 mm diameter cyclonic micro-bubble flotation column to study fluid properties. Dry-plate and wetplate pressure drops were studied and the corresponding pressure drop equations developed. The results show that the dry-plate pressure drop of the packing cyclonic micro-bubble flotation column is 10-15 times less than that of the chemical tower, which is principally shown in its relatively small resistance coefficient, ξ = 0.0207. The wet-plate pressure drop is 2-3 times higher than that of the chemical tower, which is largely caused by the separation materials and characteristics of the equipment. With flotation, the greater the pressure drop, the better the flotation environment.     

胶磷矿柱式双反浮选工艺研究

针对我国西南地区难选硅-钙质胶磷矿,采用旋流-静态微泡浮选柱对其进行了柱式双反浮选工艺的研究.以硫酸和磷酸作为磷矿物抑制剂,脂肪酸类药剂PA-64作为碳酸盐矿物捕收剂,胺类药剂GE-601作为硅酸盐矿物捕收剂,考察了磨矿细度、药剂用量、循环泵工作压力等因素对浮选指标的影响.研究结果表明,采用旋流-静态微泡浮选柱双反浮选工艺,可以得到精矿P_2O_5品位30.49%,MgO含量0.73%,磷回收率81.03%的浮选指标,简化了胶磷矿浮选工艺流程.     

Numerical simulation of a self-absorbing microbubble generator for a cyclonic-static microbubble flotation column

The Cyclonic-Static Microbubble Flotation Column (FCSMC) is currently a widely used, novel type of flotation device. The self-absorbing microbubble generator is the core component of this device. The structure of the microbubble generator directly influences flotation column performance by affecting bubble size and distribution as well as gas holdup in the column. However, the complicated flow inside the generator results in high R&D costs and difficulty in testing. Thus, the CFD software, FLUENT, was used to simulate the gas-liquid two-phase flow inside a self-absorbing microbubble generator. The effect of area ratio, a key structural parameter, was studied in detail. Critical flow-field parameters including velocity, turbulent kinetic energy, minimum static pressure and gas holdup were obtained. The simulation results demonstrate that the optimum area ratio is 3.     

新型柱浮选泡沫输送装置及固液两相流动特性

针对高含气率、高黏性柱浮选泡沫输送的需要,设计了一种新型柱浮选泡沫输送装置,并进行了固液两相流动特性模拟.结果表明,漩涡多靠近叶片工作面,其方向与叶轮旋转方向相反;叶轮内各流道压力分布较为均匀,叶轮中心区域为低压力区;颗粒直径越大,叶片工作面和轮缘处分布的颗粒越多,磨损程度越重;颗粒浓度越大,流体的全速度越高,叶轮出口附近处颗粒速度梯度越大,叶轮受局部磨损程度越重.基于数值模拟的优化设计结果表明,采用后倾叶片、扩大出料管径和增加出料管数量,有利于改善输送效果.     

FCMC—3000旋流微泡浮选柱计算机监控系统的研制

分析和阐述了FCMC－3000旋流微泡浮选柱监控系统的控制方法，硬件和软件系统，采用两点压力法，监测和控制浮选柱内液位，确立了加药量与入料流量的函数关系，编制的Windows3.X或Widows95/98应用软件实现了浮选柱的动态检测与控制，数据存贮与打印。     

中低品位铝土矿浮选柱短流程分选研究

我国铝土矿绝大多数为中低铝硅比的一水硬铝石型,矿物嵌布粒度细,分选困难.在分析铝土矿矿石性质的基础上,利用旋流-静态微泡浮选柱对中低品位铝土矿进行分选,考察了捕收剂用量、循环压力、处理量等因素对浮选效果的影响.研究结果表明:铝土矿易泥化,微细粒级含量高,其有效分选是关键;随着捕收剂用量、循环泵压力、处理量的增大,氧化铝回收率增加、精矿铝硅比下降;当捕收剂用量1000g/t,循环泵压力0.17MPa,处理量4.0t/(m2.h)时,精矿铝硅比8.02～8.13,氧化铝回收率88.77%～90.01%.采用"一粗一精"两段浮选柱分选可以完成浮选机"一粗两精两扫"五段分选作业,分选流程短,工艺简洁.