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首页> 外文期刊>Separation and Purification Technology >Crossflow filtration as a new method of wet classification of ultrafine particles
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Crossflow filtration as a new method of wet classification of ultrafine particles

机译：错流过滤作为超细颗粒湿法分级的新方法

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摘要

The particle layer build-up during crossflow microfiltration (CMF) has been examined experimentally. To gain more informtion than only the time dependent filtrate flux, specially designed flat duct modules have been developed. These modules provide defined flow conditions and allow an easy removal of the particle layer covered membrane. The particle layer thickness and topography, the specific mass flow rate and the particle size distribution were recorded. The deposition process was examined in turbulent and in laminar flow as well as for paricles having a negligible density difference compared to the liquid. These rdsults led to a new process of wet classification, that takes advantage of the primary disadvantegeous effect of selective particle deposition. The aim of the new process is to win tha particle layer as fine product. The process is subdivided in two steps. In the first step, the fines deposit on the the membrane and then are discharged by back-flushing in the second step. A new pilot plant with tubular membranes shows the transferability of the flat duct experiments and proves the feasibility of the two process steps. The influence of the determining parameters flow velocity, filtrate flux and particle concentation has been studied.
机译：已经通过实验检查了错流微滤（CMF）期间颗粒层的堆积。为了获得不仅仅是随时间变化的滤液通量的更多信息，还开发了专门设计的扁平管道模块。这些模块提供了确定的流动条件，并允许轻松去除被颗粒层覆盖的膜。记录颗粒层厚度和形貌，比质量流量和粒度分布。在湍流和层流中以及与液体相比密度差可忽略的颗粒中检查沉积过程。这些结果导致了湿分类的新过程，该过程利用了选择性颗粒沉积的主要不利影响。新工艺的目的是赢得优质产品的颗粒层。该过程分为两个步骤。在第一步中，细粉沉积在膜上，然后在第二步中通过反冲洗将其排出。一个新的带有管状膜的中试工厂展示了扁平管实验的可移植性，并证明了这两个工艺步骤的可行性。研究了确定参数对流速，滤液通量和颗粒浓度的影响。

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