2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 10: Mineral & Secondary Battery
| Editors: | Kongoli F, Silva AC, Arol AI, Kumar V, Aifantis K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 340 pages |
| ISBN: | 978-1-987820-33-1 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
< CD shopping page
Modelling The Hydraulic Entrainment Phenomenon In Microflotation
Andre Carlos Silva1; Elenice Maria Schons Silva1; Paulo Guimaraes Junior1;1UNIVERSIDADE FEDERAL DE GOIAS, Catalao, Brazil;
Type of Paper: Regular
Id Paper: 213
Topic: 5
Abstract:
Froth flotation is a mineral separation technique based on differences of the surface characteristics of the several mineral species present. The hydraulic entrainment is a phenomenon that is associated to the flotation process, consisting in the recovery of particles through the interaction between physical parameters as the air flow introduced in the system, the particle size, shape and specific mass, resulting in the entrainment of the particles trough the flow generated behind air bubbles rising in pulp. The present work was performed in order to find a function that models the hydraulic entrainment of apatite particles in Hallimond tube, basing on influence of the particle size. The entrainment tests were performed using the size fractions -300+212 Aµm, -212+180 Aµm, -180+150 Aµm and150+106 Aµm, without adding reagents. Each test was executed using 1,0 g of apatite. Then, 320 mL of distilled water with pH equal to 7 was inserted in modified Hallimond tube, followed by agitation for 1,0 min to promote the suspension of all the particles. After agitation, the aeration system was activated, starting the entrainment test itself, which also had a duration of one minute, according to standard procedure. Each test was performed in triplicate, totalling 48 tests. The results showed that there is nonlinear relation between the particle size and entrainment, described for a Gaussian function, which was adjusted trough the software Origin 9.0. In addition to this, the particles in size fraction -212+180 Aµm presented greater intensity of entrainment considering a same air flow.
Keywords:
Efficiency; Flotation; Mineral;References:
[1] Baltar, C. A. M. Flotação no Tratamento de Minério. Departamento de Engenharia de Minas - UFPE, Recife, 2008.[2] Drzymala, J. Characterization of materials by Hallimond tube flotation. Part 1: maximum size of entrained particles. International Journal of Mineral Processing. Volume 42, p. 139-152, Polônia, 1994.
[3] Kirjavainen, V. M. Application of a probability model for the entrainment of hydrophilic particles in froth flotation. Int. J. Miner. Process. 27, p. 63-74, 1989.
[4] Luz, A. B.; Sampaıo, J. A.; Almeıda, S. L. M. Tratamento de Minérios. 4º Edição. Rio de Janeiro, 2004.
[5] Neethling, S. J.; Cilliers, J. J. Solids motion in flowing froths. Chemical Engineering Science 57, p. 607-615, 2002.
[6] Subrahmanyam, T. V.; Forssberg, E. Froth Stability, Particle Entrainment and Drainage in Flotation - A Review. International Journal of Mineral Processing 23, p. 33-53, Amsterdam, 1988.
[7] Zheng, X.; Johnson, N. W.; Franzidis, J. P. Modelling of entrainment in industrial flotation cells: Water recovery and degree of entrainment. Minerals Engineering 19, p. 1191-1203, 2006.