浮选柱的分选原理与参数选择

从浮选柱的分选原理出发,指出影响浮选柱分选效果的各种因素,通过试验,确定了浮选柱分选煤泥时的最佳操作参数。     

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％.     

新型短体浮选柱的研究

介绍一种新型短体浮选柱──旋流器式浮选柱的结构，工作过程及分选状况；分析探讨了旋流力场在降低浮选柱高度方面的独特作用及显著效果，指明该浮选柱是一种工艺性能完备的新型短体浮选柱。     

旋流-静态微泡浮选柱在胶磷矿浮选工艺中的应用

采用旋流-静态微泡浮选柱对某胶磷矿进行了半工业试验研究,在原矿品位为23.73%P2O5的情况下通过正-反浮选流程获得了精矿P2O5品位29.78%、MgO品位0.29%,回收率82.69%的良好指标,缩短了流程结构.为浮选柱技术的工业应用进行了积极探索.     

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。     

浮选柱筛板充填的气含率研究

浮选柱气含率大小是决定浮选柱回收能力和分选效果的重要参数之一．探讨了旋流-静态微泡浮选柱气含率在轴向的分布及其影响因素．研究了筛板充填浮选柱的气含率,结果表明：气含率在清水且不加起泡剂的浮选柱内的轴向分布不均匀,由于气泡的兼并和破裂呈现上部低、下部高的趋势．筛板充填浮选柱的气含率随着循环量的增大先增后减,当循环量为720L／h时,平均气合率达到最大值29．6％;之后,随着给料速度的增大而略有减小;同时,随着筛板数量的增多先增后减,当筛板充填层数为7块时达到最大值．     

含Cu(Ⅱ)废液CGA-浮选柱处理的正交试验研究

用十二烷基硫酸钠（SDS）制备胶质气体泡沫（CGA），以CGA为浮选载体并通入常规浮选气泡在浮选柱内对模拟舍Cu（Ⅱ）废液进行浮选分离试验，考察浮选柱循环泵工作压力、pH值和SDS用量对Cu（Ⅱ）去除率的影响，并综合各操作参数，用部分析因法做Cu（Ⅱ）浮选分离的正交试验，试验结果表明，采用胶质气体泡沫与常规柱浮选气泡相结合的方法处理含Cu（Ⅱ）废水，铜离子去除率可达99％以上。     

溶气-柱浮选技术处理含Cr（VI）废水的研究

结合溶气气浮技术和柱浮选技术的优点,提出用溶气-柱浮选技术处理含Cr(Ⅵ)废水的思路.采用φ50 mm的浮选柱,通过特制的溶气释放器在柱体内产生微泡.介绍了该技术的工艺流程及原理.采用水合肼(N2H4·H2O)为还原剂,AlCl3为絮凝剂,十二烷基硫酸钠(sDS)为表面活性剂,考察了废水pH控制、溶气压力、回流比、絮凝剂及表面活性剂浓度对浮选效果的影响.实验结果表明,在优化操作参数的条件下,处理效果很好,废水中Cr(Ⅵ)的去除率达98%以上.     

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。     

射流浮选柱气泡发生器及其充气性能的研究

根据射流泵原理设计了一种浮选柱气泡发生器，并对其充气性能进行了试验，研究了气泡发生器结果参数、流体压力、负压与柱内含气率的关系；探讨了浮选过程中浮选药剂浓度、矿浆浓度变化对含气率的影响．结果表明：气泡发生器的射流面积比对含气率有较大影响，最佳面积比为6～10；含气率随压力增高而增加，压力升到一定程度后，含气率趋于平稳；当气泡发生器吸气室负压达到一定数值后，含气率也将趋于饱和；随起泡剂用量加大，含气率呈上升趋势；随矿浆浓度的增加，含气率则呈下降趋势．研究结果为射流浮选柱气泡发生器的设计和结构优化提供了依据。     

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.     

Experimental investigation and modeling of flotation column for treatment of oily wastewater

A unique cyclonic static microbubble flotation column was developed for oily wastewater separation. The separation efficiency was found to be highly dependent on gas holdup and bubble size distribution. By changing the circulation pressure, gas flow rate, frother concentration, the effect of operation parameters on gas holdup and oil removal efficiency were attained. A mathematical modeling between the kinetic constant and the gas holdup was established for oily water separation process. The results show that higher gas holdup and smaller microbubble sizes are beneficial to improve oil removal efficiency.     

胶磷矿浮选技术的改进

胶磷矿浮选过程选择性差的根本原因,是由于矿物组分尤其镁离子的溶解,造成矿物表面性质相互转化和捕收剂皂盐在矿物表面无选择性沉积. 通过控制浮选条件和药剂制度,尽可能避免捕收剂和溶解组份在矿物表面无选择性吸附或沉积,是选择性调控胶磷矿浮选性质的重要手段. 此外,采用机柱联合浮选装置来改善胶磷矿的浮选分离环境,对提高其浮选效率也非常重要. 实验表明:对原矿含五氧化二磷22.16%、氧化镁3.15%、二氧化硅25.41%的湖北远安磷矿石,通过采取以上改进措施,采用简单的单一浮选工艺,可获得磷精矿五氧化二磷品位＞30%、回收率＞80%和氧化镁品位1%左右的分选指标     

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.     

微泡浮选柱选煤技术

分析了微泡浮选柱的理论基础，气泡大小与浮选速率的关系，气泡大小对生产能力的影响．另外还介绍了实验室、半工业和工业生产规模微泡浮选柱的分选效果．很显然，减小气泡直径是改善超细粒物料回收率和取得最大处理能力的关键因素     

高效SE-54色谱毛细管交联柱的制备和研究

研究了石英毛细管内表面活性点处理方法,并在适当的温度下,用C.P引发交联,制备SE-54石英毛细管柱。实验结果表明:经预脱活毛细管内表面与固定相的润湿性得到显著改善,同时提高了色谱柱的柱效和耐温性能,降低了柱流失,柱效达2 700块/m以上。讨论了柱温对分离参数的影响,并应用于几个分析实例,得到了令人满意的结果。     

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.