2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 4. Lotter Intl. Symp. / Mineral Processing
| Editors: | Kongoli F, Bradshaw D, Waters K, Starkey J, Silva AC |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2017 |
| Pages: | 226 pages |
| ISBN: | 978-1-987820-67-6 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
CD shopping page
Combined Microflotation as a Powerful Technology of Fine Ferrous Ore Beneficiation
Niclolaj Rulyov1; Nessipbay Tussupbayev2;1INSTITUTE OF BIOCOLLOID CHEMISTRY, UKRAINIAN NATIONAL ACADEMY OF SCIENCES, KYIV, UKRAINE, Kyiv, Ukraine; 2, , ;
Type of Paper: Regular
Id Paper: 88
Topic: 5
Abstract:
Flotation is a conventional and most common technique for minerals beneficiation. However, its efficiency drops dramatically when floated particles size falls below 30 µm. With the depletion of rich deposits and the rising need to develop poor finely disseminated ores, which requires grinding down to particles sizes well below 30 µm, the challenge of fine particles flotation comes to the forefront. Solving this problem by increasing flotation time and bubbling rate inevitably involves increased investments and production costs, and the decrease in the concentrate quality and valuable component recovery rate. In certain cases, these considerations become critical for taking the decision on the deposit viability.
The theoretical and experimental findings show that the most effective approach to fine particles flotation challenge involves the application of fine bubbles, which are smaller than 5x(particles size). However, practically it is not feasible to generate a large amount of fine particles below 100 µm in size in conventional pneumo-mechanical flotation cells. Hence, extended research has started to design an apparatus for producing fine bubbles outside the flotation cells and introduce bubbles into a cell as air-in-water dispersion. It has been proven both theoretically and experimentally that even small volumes of fine bubbles contribute to significant increase of flotation efficiency. The method, which uses the combination of conventional coarse bubbles and fine bubbles acting actually as flotation carriers, is termed «combined microflotation».
The purpose of the present study is to establish the effectiveness of microbubbles application for beneficiation of finely dispersed (80% below 33 µm) magnetite concentrate (iron content 64.5%) by reverse flotation in pneumo-mechanical cells at actual production facilities of Poltavsky Concentrator (Gorishni Plavni, Ukraine). The industrial scale generator “SEBBA-5” (delivered by Turboflotservice Company) was used as a microbubble source. This generator produces bubbles smaller than 50 µm. The results have shown that the relative increase of the flotation rate (when the iron content in the concentrate reaches 68%) is practically in direct ratio to the volume dose of fine bubbles per feed unit weight. In particular, at the microbubble dosage of 0.005 m3/t flotation rate constant has increased by 8.7% and at the dosage 0.015 m3/t – by 25%.
Keywords:
Flotation; Iron; Mineral; Ore; Particles; Technology;References:
[1] В. V. Derjaguin, S. S. Dukhin and N.N. Rulyov: Kinetic theory of flotation of small particles, in Surface and Colloid Science (ed: E. Matievič), 1984, Plenum Press: N. Y. – London, v. 13, 71-113.[2] J. F. Anfruns and J. A. Kitchener: Rate of capture of small particles in flotation, Transactions of the Institution of Mining and Metallurgy C: Mineral Processing and Extractive Metallurgy, 86 (1977), C9–C15.
[3] N. N. Rulyov: TURBULENT MICROFLOTATION OF FINE DISPERSE MINERALS (The General Concept), Proceedings of Strategic Conference and Workshop: FLOTATION & FLOCCULATION: From Fundamentals to Applications, (ed. J. Ralston et al), (2003) Snap Printing, Australia, 177-184.
[4] N. N. Rulyov: TURBULENT MICROFLOTATION: Theory and Experiment, Colloids & Surfaces A: Physicochemical and Engineering Aspects, 192 (2001), 73 – 91.
[5] G. Reay and C. A. Ratcliff: Effects of bubble size and particle size of collection efficiency, Can J. Chem. Eng., 53 (1975), 481-486.
[6] N. N. Rulyov: TURBULENT MICRO-FLOTATION OF ULTRA-FINE MINERALS, Mineral Processing and Extractive Metallurgy (Trans. Inst. Min. Metall. C), 117 (2008), 32- 37.
[7] F. Sebba: Improved generator for micron-sized bubbles, Chemistry and Industry, 3 (1985), 91-92.
[8] R.-H. Yoon: Microbubble flotation, Minerals Engineering, 6 (1993), 619–630.
[9] N. N. Rulyov: COMBINED MICROFLOTATION OF FINE MINERALS: Theory and Experiment. Mineral Processing and Extractive Metallurgy (Trans. Inst. Min. Metall. C), 125, (2016) 81-85.
[10] M. Fan, D. Tao, R. Honaker and Z. Luo: Nanobubble generation and its applications in froth flotation (part IV): mechanical cells and specially designed column flotation of coal, Mining Science and Technology, 20 (2010), 0641–0671.
[11] M. Fan, D. Tao, R. Honaker and Z. Luo: Nanobubble generation and its applications in froth flotation (part II): fundamental study and theoretical analysis. Mining Science and Technology, 20 (2010), 0159–0177.
[12] 12 R., Ahmadi, D. A., Khodadadi, M. Abdollahy, and M. Fan: Nano-microbubble flotation of fine and ultrafine chalcopyrite particles, International Journal of Mining Science and Technology, 24 (2014), 559–566.
[13] S. Calgaroto, A. Azevedo and J. Rubio: Flotation of quartz particles assisted by nanobubbles, International Journal of Mineral Processing, 137 (2015), 64–70.
[14] N. N., Rulyov, N. K. Тussupbayev, and О. V. Kravtchenco: Combined Microflotation of Fine Quartz. Mineral Processing and Extractive Metallurgy (Trans. Inst. Min. Metall. C), 124 (2015), 217–233.
[15] N. K., Тussupbayev, N. N. Rulyov, and О. V. Kravtchenco: Microbubble augmented flotation of ultrafine chalcopyrite from quartz mixtures. Mineral Processing and Extractive Metallurgy (Trans. Inst. Min. Metall. C), 125 (2016), 5-9.