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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Based on the data, the solids content of the upper part in the column is slightly smaller than the initial solids content, and as time goes by, it also dedimentation gradually. Experimental Apparatus sedimenfation Methodology Since Kynch theory ignores all the chemical and physical forces between particles, no further analysis on the influence of pH values will be discussed.

Customize your widget with the following options, then copy and paste the code below into the HTML of your page to embed this item in your website. When one specific column-settling test is finished, the pushing device is used to push the sample out the top of the settling column. Tests were also conducted on fines of copper tailings with dispersant, kaolin and a mixture of kaolin and concrete sands.

It is easy to identify the termination of all the lines with constant concentration as the line AB represents the fall of the interface between the supernatant water and the suspension. Back to tab navigation Fetching data from CrossRef. For reproduction of material from PCCP: However, for the convenience of exposition, a simplest relationship is assumed in his paper.

The results of particle size distribution analysis are discussed in order to sedimentatikn the 5 segregation phenomenon in column settling tests and the column settling tests with sample-collection. According to Kynch theory, the most important observation target is the interface between the supernatant water and the suspension below it.


The application of interface settling rates in hindered settling to the determination of the mean particle radii.

Soils and Foundations, 21 1 The curve can be divided into two sections. Characterization, treatment and environmental impacts. Contact Us Terms Help Privacy. However, only one mode is examined in detail in this research. Application of dewatering technologies in throry of robust non-segregating tailings.

After tailings are produced, most of the tailings mass is normally discharged in a storage tailings pond known as a Tailings Management Facility TMF in the form of slurry Lottermoser, Two mixing kyncg were employed for the column-settling test. When the interface reaches ml or ml, the velocity suddenly decreases to a relatively low value. Water or liquid is squeezed out of the mass.

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Particle size distribution is presented in Figure 3. In order to gain further understanding regarding the process of sedimentation, column settling tests are employed in this research to learn about the settling behavior of tailings. Coarse particles settle individually at the beginning of thory column settling test, leading to two negative results regarding the application of Kynch theory.

Experimental data is listed in Appendix F. In the latter tests, the second method of mixing the solution directly in the thdory and shaking was selected for the rest of the tests since it is more convenient and efficient. They claimed that, for the dispersion of grained particles prepared in a low concentration, there is a time period in which the movement of the interface between the dispersion and water settles in a linear fashion.

The diameter of the column is 2. An understanding of sedimentation and consolidation of tailings provides a solid foundation for the management of tailings.

One yknch explanation for this is the segregation of larger particles in the fines. Prior to filling the columns, the MFT left were sampled for time zero analysis. Fundamental study of the sedimentation of copper tailings with Kynch theory.


Kyncn settling tests and the column settling tests with sample-collection on copper tailings with different particle size ranges were conducted to investigate the influence of sedinentation size on general settling behavior. A large amount of coarse particles settled at the bottom of the column in the first one or two minutes. One possible explanation of this phenomenon is the segregation of the coarse particles.

Applicability of Kynch Theory to Flocculent Suspensions

After putting the bottom piece on, the volume of the column was recorded as ml. Experimental data is listed in Appendix E.

It took around 12 days for the interface to drop 50 ml along the settling column 1 hour in the tests without dispersant. Column settling tests on different fractions of copper tailings were carried out to investigate the settling behavior.

As such, a new apparatus was designed and constructed. At different time intervals 15 beginning from time zerosamples were drawn from each of the sample ports from top to bottom. After 24 hours, the interface stopped at around ml.

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

This may sedimentatiion some time to load. Suspensions with lower solids contents may not form a clear interface during the sedimentation process. Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

This liquid-solid separation is known as sedimentation. There were eight ranges: Doctoral dissertation, University of Alberta. Discrete particles in low concentration suspensions.