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以萃取混合澄清器的澄清室为研究对象,通过改变澄清室结构,包括:1)在澄清室加装挡板和带孔栅板;2)保持混合室与澄清室体积比不变,减小澄清室高度,增加澄清室面积;3)在澄清室顶部加装混合相溜槽,增加混合相流通路径等3种措施,来提高其澄清能力。研究表明,这3种措施对提高混合澄清器的澄清性能均有一定作用,其中增加澄清室面积对提高澄清性能效果最好,其次为增设混合相溜槽,最后是增设挡板和带孔栅板。 相似文献
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卧式机械搅拌混合澄清器简介与选择 总被引:1,自引:0,他引:1
<正> 一、前言混合澄清器是所用较早、应用较广、处理量较大、种类繁多的液-液萃取器。按多级混合澄清段的装配位置不同,可分为卧式混合澄清器与立式混合澄清器。前者以水平方式相连,后者以垂直方式相连。按输入量不同,可分为机械搅拌混合澄清器、离心分离混合澄清器、空气脉冲混合澄清器、超声波混合澄清器和利用流体能的混合澄清器。针对目前国内的湿法冶金工业中普遍采 相似文献
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<正> 前言混合澄清器是一种使用较早、应用较广和种类较多的萃取器。我国采用的普通混合澄清器,是一种在混合室设有前室的三孔型萃取器,重相从下 相似文献
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具有平行的、板状的倾斜板或槽形通道的倾斜面澄清器结构紧凑。有极好的澄清功能,可确保构件负荷均匀,浓密性能稳定以及沉积物排出方式合理。 相似文献
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由于采用最佳的絮凝技术,即使是非常难澄清和难浓缩的悬浮液也能改善澄清和浓缩效果,并且可以有规律地控制.高效浓缩机具有使絮凝颗粒和胶质物料更快地沉降的优点,从而明显降低费用.倾斜板澄清器的澄清面积大,当给料含水量大时,所需澄清体积减小,配套采用特殊设计的浓缩机,絮凝颗粒可以得到充分浓缩. 相似文献
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为解决传统煤炭矿井水处理工艺成本高、设备占地面积大等问题,提出并设计了一种锥盘旋流澄清器,采用CFD技术对锥盘旋流澄清器内部流场进行了数值模拟,研究进料速度和锥盘插入深度对其澄清性能的影响,并进行了试验验证。结果表明:在一定范围内,增大锥盘插入深度,可以适当增加湍动能,从而提高澄清性能;适当增大进料速度也可增加湍动能,但是进料速度超过1.6m/s时,湍动能过大,对絮体扰动作用过大,反而不利于澄清性能的提高。当进料速度为1.6m/s,锥盘插入深度为400mm时,固体悬浮物去除率可达92.1%,浊度去除率可达59.8%。 相似文献
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为了研究封闭巷道岔路口处挡板设置位置对冲击波传播特性影响,使用ANSYS数值计算软件进行二维爆炸流场模拟,针对挡板的方向及位置进行了比较,监测并绘制了管网中各点的超压变化曲线以及挡板处的速度矢量图,分析爆炸冲击波的传播规律。研究结果表明:单挡板放置在冲击波去向侧时,对巷道底部的超压影响相比无挡板的情况变化不大,但对封闭巷道中心部位的超压削弱效果最佳,并对压力的波动具备一定稳定效果;在设置双挡板且双挡板均放置在冲击波去向侧时,对封闭巷道中心部位的超压削弱程度最大,而双挡板异侧放置且入口处挡板在冲击波来向侧时,对巷道内壁面的超压削弱效果最佳。 相似文献
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The copper Leaching, Solvent Extraction and Electrowinning circuit (LX–SX–EW) is one of the most effective processes for extracting copper from low grade ores. This work focuses on the liquid–liquid extraction SX sub-process, since many difficult to handle operational problems within LX–SX–EW circuits are related to SX malfunction. Controlling these problems better can reduce operational costs and increase recovery and copper production. Realistic dynamic simulation is a standard tool nowadays to design and assess more effective control strategies. In this work we present a general dynamic model for SX mixer–settlers, and applied it to two different units, one located in an extraction stage and the other in a stripping stage of a copper plant. The model includes a non-trivial settler hydrodynamics represented by a set of nonlinear differential equations for both mixer and settler units. The mixer is modelled as a continuous stirred tank reactor and the settler as a hydrodynamic circuit combining series and parallel connections of continuous stirred tank and plug flow reactors. The model was calibrated with industrial plant data, resulting in realistic simulations of outlet copper concentrations. Using the proposed model, we obtained better fitting than that achieved with simpler settler models that include only a time delay. The model fitting parameters provide sufficient flexibility to accurately reproduce the dynamics of different units in industrial plants. 相似文献
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论述了顺流浮选机下导管中气容率的在线测定方法。详细地研究了各种操作参数对下导管中气液两相流和气固液三相流的气容率比及工作稳定性的影响。 相似文献
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《Minerals Engineering》2006,19(1):37-47
The liquid phase hydrodynamics in column and heap leaching is a key design aspect that has attracted some attention, but was not yet completely elucidated. On the other hand, conventional trickle bed catalytic reactors have received enormous attention for many decades; however, the operational variables range in this case is generally far from the column and heap leaching processes. This paper presents a hydrodynamic study performed in a bench scale column, where the axial dispersion and the liquid holdup, as a function of the liquid flow rate, are estimated using residence time distribution experiments. The normalized tracer concentrations are fitted using a non-linear least square method and the piston-dispersion-exchange model that is solved numerically using the finite differences method. The trends of axial dispersion, dynamic and static saturation, and exchange coefficient for mass exchange between mobile and stagnant phases, showed excellent agreement with previous results for low Reynolds number in conventional trickle bed reactors. In this study, these experimental results and empirical correlations are presented. The dynamic saturation of the bed increases with the flow rate while the static saturation decreases slightly. The axial dispersion is weak dependent of the liquid flow rate, but is non-negligible and should be accounted for in the mathematical modeling of heap and column leaching process. 相似文献
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介绍了一种改进型箱式混合澄清器的结构特点及其在提钒新工艺萃取过程中的应用情况。实际生产运行考察结果表明,该设备完全能满足提钒新工艺的要求并具有效率高、分相快、操作简便、运行稳定、适应能力强等优点。 相似文献
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利用四阶Runge-Kutta法求解了液固分选流化床内颗粒的简化动力学方程,得到了颗粒速度和位移等随时间变化关系,并搭建了流化试验系统,验证了颗粒简化动力学方程的准确性,其预测的颗粒干扰沉降末速相对偏差基本可控制在5%以内。建立了基于该简化动力学方程的液固分选流化床数学模型,与试验分选结果相比,各密度级颗粒分配率的均方根误差为5.05。利用该模型探究了入料速率对颗粒分离结果的影响,发现入料速率增大导致的床层有效密度与实际分选密度比值减小是该过程中液固流化床分选效率降低的原因。 相似文献
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矿浆斜窄上升流的固粒沉降与分级过程研究与应用 总被引:1,自引:0,他引:1
将斜浅层发展并界定为矿浆斜窄(上升)流,按三维立体系统研究了其固粒沉降与分级过程,包括流宽对分级精度的关键作用。指出拉美拉设备为单元集成式结构,斜窄流设备也由元件、单体、组合体集成,经参数优化扩试推荐的斜窄流斜长、厚度及斜角的优选范围分别为:>1.2m、>30mm及45°~77.2°。该设备大规模工业应用已6年,钛铁矿选厂给矿浆的分级、锡选厂细粒锡石床选前的脱泥以及磷矿石闭路湿磨中的分级等,实现的单位占地产能平均为原有设备的4倍,分级质效率翻番。 相似文献