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首页> 外文期刊>FILTRATION >FILTERABILITY OF MINERAL SUSPENSIONS PREDICTED WITH THE ANALYTICAL PHOTOCENTRIFUGE: METHOD OF MULTISTAGE CENTRIFUGATION
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FILTERABILITY OF MINERAL SUSPENSIONS PREDICTED WITH THE ANALYTICAL PHOTOCENTRIFUGE: METHOD OF MULTISTAGE CENTRIFUGATION

机译：分析性离心法预测的矿物悬浮液的易滤性：多级离心法

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摘要

This article describes an experimental procedure and data analysis for characterising the filterability of min- eral suspensions with the help of a new method of multistage centrifugation (MC). MC is based on the com- bination of two experiments: centrifugal sedimentation-consolidation in a centrifuge tube with an impermea- ble bottom, and centrifugal compression-permeability in a centrifuge tube with a permeable bottom (filtration cell). The experiments were performed at different centrifugal accelerations with the help of the analytical photocentrifuge. The application of MC requires a relatively small quantity of suspension (a few millilitres). The analysis of experimental data yields the constitutive equations, namely the dependence of local perme- ability on particle volume fraction, and the pressure dependencies of local filter cake dryness and local spe- cific cake resistance. MC was used for characterisation of the model suspension of calcium carbonate. Application of MC allowed the estimation of specific resistance in the pressure range 10~4 to 10~5 Pa. The values of specific cake re- sistance, obtained with the help of MC, were in good correspondence with those determined from conven- tional constant pressure filtration experiments. The pressure dependence of specific cake resistance ob- tained by MC was also comparable with that estimated for a lower pressure region (10~3 to 10~4 Pa) by the method of centrifugal consolidation as proposed by Loginov et al.
机译：本文介绍了一种借助多级离心（MC）新方法表征矿物质悬浮液可过滤性的实验程序和数据分析。 MC是基于两个实验的结合：底部不透水的离心管中的离心沉降-固结，底部为可渗透的离心管（过滤池）中的离心压缩-渗透率。借助分析型离心机，以不同的离心加速度进行了实验。 MC的应用需要相对少量的悬浮液（几毫升）。对实验数据的分析得出了本构方程，即局部渗透率对颗粒体积分数的依赖性，以及局部滤饼干燥度和局部特定滤饼阻力的压力依赖性。 MC用于表征碳酸钙的模型悬浮液。使用MC可以估算10〜4到10〜5 Pa压力范围内的电阻率。借助MC获得的比饼电阻值与从常规常数确定的电阻值非常吻合。压力过滤实验。 MC所获得的特定滤饼阻力的压力依赖性也可以与Loginov等人提出的通过离心固结方法在较低压力区域（10〜3至10〜4 Pa）估计的压力依赖性相当。

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