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Modeling of Cross Flow Classifier with Water Injection
Abstract:In hydrocyclones, the particle separation efficiency is limited by the suspended fine particles, which are discharged with the coarse product in the underflow. It is well known that injecting water in the conical part of the cyclone reduces the fine particle fraction in the underflow. This paper presents a mathematical model that simulates the water injection in the conical component. The model accounts for the fluid flow and the particle motion. Particle interaction, due to hindered settling caused by increased density and viscosity of the suspension, and fine particle entrainment by settling coarse particles are included in the model. Water injection in the conical part of the hydrocyclone is performed to reduce fine particle discharge in the underflow. The model demonstrates the impact of the injection rate, injection velocity, and injection location on the shape of the partition curve. The simulations are compared with experimental data of a 50-mm cyclone.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1334453Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1589
 Dueck, J., Neesse, Th., Minkov, L., Kilimnik, D., Hararah, M., 2004. Theoretical and experimental investigation of disturbed settling in a polydisperse suspension. In: Matsumoto, Y., (Eds.), Proceedings of ICMF-2004. Fifth International Conference on Multiphase Flow, 30 May-4 June, Yokohama (Japan), Paper No. 106, pp. 1-8.
 Dueck, J.G., Yu, D., Kilimnik, L.L., Min-kov., Neesse, Th., 2003. Measurement of the sedimentation velocity of finely divided particles in a tray centrifuge. Journal of Engineering Physics and Thermophysics 76 (4), 748-759.
 Dueck, J.G., Minkov, L.L., Pikushchak, E.V., 2006. On separation curves of a throughput classification apparatus of finite length. Journal of Engineering Physics and Thermophysics 79 (4), 171-178.
 Dueck, J., Minkov, L., Pikutchak, E., 2007. Modeling of the ÔÇÿÔÇÿFish- Hook"-Effect in a classifier. Journal of Engineering Physics and Thermophysics 80 (1), 64-73.
 Heiskanen, K., 1993. Particle Classification. Chapman and Hall, London-Glasgow-New York-Tokyo-Melbourne-Madras. p. 321.
 R.Q., Ozsever, A.V., Singh, N., Parekh, B.K., 2001. Apex water Injection for improved hydrocyclone classification efficiency. Mineral Engineering 14 (11), 1445-1457.
 Kelsall, D.F., Holmes, J.A., 1990. Improvement in classification efficiency in hydraulic cyclones by water injection. In: Proceedings of the 5th Mineral processing Congress, Paper 9, Institute Of Mining and Metallurgy, pp. 159-170.
 Minkov, L., Dueck, J., 2005. Collective effects by settling of polydisperse dense suspension. Eurasian Physical-Technical Journal 12 (1(3)), 47-63.
 Neesse, Th., Schubert, H., Graichen, K., 1991. Practical and theoretical aspects of dense-flow classification. Aufbereitungstechnik 32 (9), 459- 472.
Schubert, H., Neeße, Th., 1980. A hydrocyclone separation model in consideration of the multi-phase flow. In: Preprints International Conference of Hydrocyclones, Cambridge, BHRA Fluid Engineering, Paper No. 3, pp. 23-36.
Udaya Bhaskar, K., Govindarajan, B., Barnawal, J.P., Rao, K.K., Gupta, B.K., Rao, T.C., Classification studies of lead-zinc ore fines using waterinjection cyclone. International Journal of Mineral Processing 77, 2005, 80-94.