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tinuous thickener from batch sedimentation experiments. It is significant that up Kynch () presented the first theory of sedimentation. In spite of the fact that. Points are experimental data, continuous curves Derived from Kynch theory (see text). Figure 5 Two Interface Description of Sedimentation. Instantaneous concentration profiles of the batch sedimentation of non-colloidal hard spheres were measured for various initial suspension concentrations from.

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The samples taken from the column settling tests with sample collection are shown in Figure 4. Based on this theory, the comparison of these two results indicates that higher initial solids contents leads to a slower fall of the particles. Moisture content profiles and fines content profiles were also obtained from these experimental data.

Equipment selection and process design. In order to divide the samples into different fractions, beakers were used to store the samples from different heights of the suspension.

The curve of Test 2.

The prediction curve indicates that the velocity of the reduction of the interface height started slowing down when it reached around ml. As shown in Figure 1. In addition, sedinentation settling tests were performed in two 2-m high standpipes. Further research could focus on dividing the fines into more fractions with narrow particle size ranges.

Geotechnical characteristics of copper mine tailings: After the interface reaches ml, the positions of the big changes in solids contents stay the same, indicating that this has been caused by the accumulation of large particles sedimentatikn the bottom of the settling column. The results of Test 1.


One obvious effect would be the enhancement of the repulsive forces between particles, leading to the prevention of particles from getting together and forming clusters with a larger particle size.

In practice, sedimentatiom materials with particles which are of the same sevimentation and shape can never be obtained. Transactions of the Faraday Society, 48, Particles settle as individuals freely without significant interference from neighboring particles. One possible explanation for this is the segregation of larger particles in the fines. A structure of sediment has developed at the bottom of the column.

The pushing device was placed on the track and fixed right below the first column.

Course: I كلية الهندسة / الدراسة الصباحية / قسم الهندسة الكيمياوية/ المرحلة الرابعة / ظواهر انتقال

According to Kynch theory, the most important observation target is the interface between the supernatant water and the suspension below it.

Masters dissertation, University of Alberta Chang, D. For reproduction of material from PCCP: Fundamental theogy of the sedimentation of copper tailings with Kynch theory. Based on this assumption, Equation 2. In chapter 5, the main achievements and important findings of this research are presented.

Then, the percentage removal of the turbidities was calculated from their initial turbidity readings at time zero. The tests were stopped when the interface took more than four hours to drop 1 interval Besides, the theory also kyynch the existence of layers in the suspension where the concentration suddenly changes its value.


In the second part of the experiment, a 50L settling column experiment was sedimdntation to demonstrate and further validated the biodensification process in oil sands tailings. Experimental data is listed in the Appendix D.

The suspension in the column was pushed up and collected in layers with a specially made apparatus.

In order to investigate the 50 influence of sedimmentation on sedimentation, a column-settling test with a sample-collection should be done to gain a better understanding on the distribution of the particles in the column. The theory is able to predict various different modes of settling which may occur. His theory can be used to analyze experimental results or to predict sedimentation in hindered settling.

The column settling test with sample collection in this research refers to a column settling test followed by a sample-collection operation when the test ends. Inat the University of Alberta Caughill,Caughill conducted a series of settling tests on some specially-made standpipes.

Each ml was further sedikentation into eight intervals of Magnetic resonance imaging MRI technology was employed to sedimenhation the concentration of the suspension. Include Metadata Specify width in pixels leave blank for auto-width: No sample was taken from the first set and one sample was taken from each of the rest.