Effect of inclined plane on the semimentation of calcium carbonate suspension

Abstract

The present study was undertaken in order to understand the settling phenomena of calcium carbonate in vertical vessel and vessels with inclined planes. The settling rates, in the presence of inclined planes, were compared with the vertical settling rate. Trapezoid shaped vessel and parallelogram shaped vessel were employed as settling vessels with inclined planes. The initial settling rate of calcium carbonate in the presence of inclined plane is larger than the vertical settling rate by a factor of 1 to 3 within the range of variables studied. Settling rate in the geometry having inclined plane can be represented as a sum of the vertical settling rate and the rate due to the rising of the cleat liquid along the inclined plane. The model developed in this study is $$(V_i)_o = (V_v)_o + \frac{m \cdot H_o/ \sin \theta}{B+H_o \cot \theta}$$ for trapezoid Where m, clear liquid flux, is a function of suspension concentration and inclined angle and is determined from experimental data as follow ; $$m=-0.0216\exp\,(-15.54C)\,\theta+3.5372\exp(-18,765C)$$ Present model gives a good agreement between the experimental data and calculated values. Present model for parallelogram is $$(V_i)_o=(V_v)_o+\frac{m \cdot H_o/\sin \theta}{B}$$ But for the parallelogram, experimental values are a little lower than the predicted values because of the lower inclined plane.