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Cake Filtration에서 공극률과 비저항의 변화특성

Variation of Porosity and Specific Resistance in Cake Filtration

HWAHAK KONGHAK, August 1987, 25(4), 419-426(8), NONE
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Abstract

Cake filtration에서 cake의 공극률과 국소여과 비저항이 filter cake에 가해지는 압력에 따라 변화하는 특성을 단면적이 38.48 ㎝2되는 filter cell에서 실험적으로 고찰하였다.
실험에 사용된 슬러리는 탄산칼슘, Talc(I) 및 Talc(II)의 세종류 입자를 각각 물에 섞어서 사용하였는데, 입자의 첨가량은 30 wt%로써 고농도 슬러리였다. Fiter cake에 가해지는 압력은 외부에서 가해지는 압력과 실런더 벽과 cake의 마찰에 의한 에너지 손실을 고려한 실제 cake에 가해지는 압력을 고려하였다.
실검결과 Filter cake의 공극률은 압력의 증가에 따라 log-log 그래프에서 선형적으로 감소하였으며, 국소여과 비저항은 압력의 증가에 따라 log-log 그래프에서 선형적으로 증가하였다.
다공성 입자인 규조토를 첨가한 슬러리의 경우 filter cake의 공극률의 현저한 증가를 가져와 국소여과 비저항을 줄일 수 있었다.
Variations of porosity and specific local resistance in cake filtration were studied in a filter cell by increasing filtration pressure. The cross sectional area of filter cell was 38.48 ㎝2, and the slurries used were made of water and CaCO3, Talc(I) and Talc(II), respectively. The amount of solids added to water was 30 wt% to make highly concentrated slurries.
The net loading pressure to the filter cake as well as the pressure to the filter cell were considered to verify the dependence of porosity and specific resistance on the loading pressure.
From the experimental results, the cake porosity decreased and the specific local resistance increased linearly with the increasing pressure in log-log plots, respectively.
The addition of the porous dialite as a body-feeding filter aid into slurries increases the cake porosity and decreases the specific local resistance of the filter cake.

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