Abstract
This work presents the study of filtration of calcium carbonate aqueous suspensions in the presence of a dispersing agent. Two methods were used in this investigation. According to the first method, the dispersing agent was added to the calcium carbonate suspension and the filtration of this suspension was carried out in a single stage. The filter cake obtained by this method was homogenized and liquefied (acquired the fluidity), but the filtrate was contaminated by the dispersing agent. In the second method, two-stage filtration was carried out. In the first stage, a pre-layer of cake was formed using the calcium carbonate suspension without the dispersing agent. In the second stage, the dispersing agent was added to the suspension in order to form a liquefied cake and to saturate the pre-layer of cake by dispersing agent. The influence of the dispersing agent concentration on the filtrate electrical conductivity, the filter cake resistance and the dryness were compared for the two methods. The new method of two-stage filtration reduces or completely eliminates the filtrate contamination by the dispersing agent and decreases the cake resistance when compared with the single-stage filtration. The filter cakes obtained by both single- and two-stage filtration are fluid and show thinning behaviour at shear rates between 10 and 600 s−1.
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