Constancy of Slurry Concentration in Filtration

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Constancy of Slurry Concentration in Filtration

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- Constancy of Slurry Concentration in Filtration
- CIESC Journal Issue 4, (1991)
- 作者机构：
  
  福州大学化工系,福州
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 August 1991，
  
  Published：25 August 1991
- 稿件说明：
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王中来. Constancy of Slurry Concentration in Filtration[J]. CIESC Journal, 1991, (4).
DOI：

王中来. Constancy of Slurry Concentration in Filtration[J]. CIESC Journal, 1991, (4). DOI：

摘要

本文对过滤过程悬浮液的平均浓度和瞬时浓度进行理论分析

并推导出相应的计算公式;同时

介绍一种测定瞬时浓度的实验方法.结果表明

通常情况下

采用通气搅拌、机械搅拌和循环流动三种恒浓度方法中的一种或两种

即能保证悬浮液浓度在过滤过程中基本上维持恒定.

Abstract

The slurry concentration plays an important role in filtration. Four concepts of concentration are developed

the conventional concentration of slurry 5

which is the mass fraction of solids in slurry from the slurry-tank

the average concentration during filtration Sav defined by Sav =Ws/(ρV + mavWs)

the percentage variation of the average concentratin Eav defined by Eav=| (S-Sav)/S |×100%

and the instantaneous concentration of slurry in filtration St

which is the concentration at cake/slurry interface. On the basis of material balance

the equation of the instan taneous concentration of slurry in filtration is derived as follows: where ρs is the true density of cake solids

ρ the density of filtrate

A the filtration area

V the volume of filtrate

i the number of drainage surfaces

L the thickness of filter-chamber

and εi the porosity at cake/slurry interface which is determined by the Compression-Permeability Cell tes.tThe experiments to measure dV/d(L/i) in the equation were made by use of the experimental apparatus for hydraulic pressure distributions.

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