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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This may take some time to load. To load this item in other compatible viewers, use this url: The results are shown in Figures 4. The drop of the interface or the change of the upper section of the suspension has nothing to do with the structure on the bottom, and for this reason, the last sections of sediemntation the curves stay in the same position. There is kynchh the other possibility that sedumentation dramatic increase of the solids content is simply a result of the accumulation of coarse particles.

Two O-rings were used on the bottom piece to prevent leakage and to help the bottom piece move smoothly and stably in the column. The management of tailings is a significant issue within the mining industry worldwide.

Settling rates and sediment volumes of flocculated kaolin suspensions. Since we know that the concentration varies with the height x, the total particles crossing level K can also be expressed as: I would also like to offer my gratitude to Aaron Hope, millwright of CMP laboratory, for his hard work on the construction of the experimental apparatus.


In order to investigate the 50 influence of segregation 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. At the beginning, several sets of column settling tests are performed. Total copper tailings, with a large range of particle sizes could not satisfy the assumptions of Kynch theory on particle size, and failed to conform to Kynch theory.

As shown in Figure 1. However, only one mode is examined in detail in this research. The first involves an improved methodology through which to collect samples of sediment at different heights in the settling column during the settling test. Since Kynch theory ignores all the chemical and physical forces between particles, no further analysis on the influence of pH values will be discussed.

The compression of the structure was barely seen to occur. Experimental Apparatus and Methodology With more experimental data, the influence of compression settling on Kynch theory might be more accurately summarized.

This result indicates that a decrease kyncj the effect of segregation increases the applicability of Kynch theory. A plausible explanation would be the existence of sedimentation in the beaker, and not having stirred enough when the samples were being moved into the settling column, leading to a lower solids content in the settling column.

In most cases, sieve analysis is conducted on dry materials. One possible explanation of this phenomenon is the segregation of the coarse particles.

Several objectives of this study are summarized. Coarse particles settle individually at the beginning of the column settling test, leading to two negative results regarding the application of Kynch theory.


In other words, the first set was sampled when the interface reached ml, and the second set was sampled when the interface reached ml. Some specific objectives of this research are: Observations were made on the rest of the four sets and are shown in Figure 3.

This worked well for the layers on the top since the water content was high, but not well for the bottom layers as the water was removed before the sand particles.

A theory of sedimentation – Transactions of the Faraday Society (RSC Publishing)

Once the sample collection process started, the samples were pushed out slowly using the specially made apparatus. Chapter 3 presents a description of the test samples of total tails and fines from copper tailings.

Authors contributing to RSC publications journal articles, books or kynh chapters do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material.

The pushing device was placed on the track and fixed right below the first column. A new experiment apparatus was constructed to conduct column settling tests and column settling tests with sample collection.

In this case, all the curves should be straight lines as in Figure 2.