Effective parameters on generation of nanobubbles by cavitation method for froth flotation applications

• Autorzy: Pourkarimi Z. , Rezai B. , Noaparast N.

Identyfikatory

DOI

10.5277/ppmp170220

• Języki publikacji: EN

Abstrakty

EN

The significant recovery increase in flotation of fine particles using nanobubbles has been one of the major topics in flotation science in recent years. Fine bubbles have an important effect on gas hold-up, which is necessary in froth flotation of minerals based on the process industries. At a given gas hold-up, using finer bubbles can reduce frother consumption. An exclusive nanobubble generation system has been developed in Iran Mineral Processing Research Center (IMPRC) to evaluate the effect of nanobubbles on the froth flotation performance. This device, which enhanced venturi tubes, works according to cavitation phenomena. The venturi tube is the most widely used hydrodynamic cavitation device, in which liquid flow increases in the conical convergent zone of the tube due to the thin diameter. The liquid in the cylindrical throat is higher in a flow velocity and lower in a pressure than the liquid in the entrance cylinder, which results in cavitation. In this research work, various factors such as the frother type and dosage, pH, compressed air flow, pressure in cavitation nozzle, gas types, temperature and venturi tube internal diameter were studied. For this purpose, a five-level central composite experimental design was used to check the influence of four important parameters on the median size and volume of nanobubbles. Online measurement of the bubbles size was implemented by a laser particle size analyzer (LPSA), according to standard BS ISO 13320-09. Due to the above parameters and obtained responses, the analysis of variance (ANOVA) was conducted with a suitable model to optimize the conditions, with the aim of minimizing the size of air bubbles. The optimal conditions were: frother (MIBC) dosage of 75.8 mg/dm3, air flow rate of 0.28 dm3/min, pressure of 324 kPa and pH of 9.5. The median bubble size d50 was equal to 203 nm. To validate the results, a test under optimum conditions was performed and the obtained results indicated that there was a good fit at the confidence interval of 95% and reflected the repeatability of the process.

Słowa kluczowe

EN

flotation; nanobubbles; cavitation; venturi; laser particle size analyzer

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2017
• Tom: Vol. 53, iss. 2
• Strony: 920--942
• Opis fizyczny: Bibliogr. 34 poz., rys., tab.

Twórcy

autor

Pourkarimi Z.

• Department of Mining and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnics), Tehran, Iran

autor

Rezai B.

• Department of Mining and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnics), Tehran, Iran

autor

Noaparast N.

• School of Mining Engineering, University of Tehran, Tehran, Iran

Bibliografia

• AHMADI R., KHODADADI DARBAN, A., 2013, Modelling and optimization of nano-bubble generation process using response surface methodology, International Journal of Nanoscience and Nanotechnology, Vol. 9, No. 3, 151-162.
• AZGOMI F., 2006, Characterizing frothers by their bubble size control properties, Master Thesis in Metals and Materials Engineering, McGill University, Montreal, Canada.
• AZGOMI, F., GOMEZ, C.O., FINCH, J.A., 2007, Correspondence of gas holdup and bubble size in presence of different frothers, International Journal of Mineral Processing, 83, 1–11.
• CALGAROTO S., WILBERG K.Q., RUBIO J., 2014, On the nanobubbles interfacial properties and future applications in flotation, Minerals Engineering, 60, 33-40.
• CONWAY B.E.,1975, Ion hydration near air/water interfaces and the structure of liquid surfaces, Journal of Electroanalytical Chemistry, 65, 491-504.
• ELMAHDI A.M., MIRNEZAMI M., 2008, FINCH J.A., Zeta potential of air bubbles in presence of Frothers, International Journal of Mineral Processing, 89, 40–43.
• FAN M., TAO D., 2008, A study on picobubble enhanced coarse phosphate froth flotation, Separation Science and Technology, 43, 1-10.
• FAN M., 2008, Picobubble enhanced flotation of coarse phosphate particles, Ph.D. Dissertation in Mineral Processing, University of Kentucky, Kentucky, USA.
• FAN M., TAO D., HONAKER, R., LUO, Z., 2010, Nanobubble generation and its application in froth flotation (part I): nanobubble generation and its effects on properties of microbubble and millimetre scale bubble solutions, Mining Science and Technology 20, 1–19.
• FAN M., TAO D., HONAKER, R., LUO, Z., 2010, Nanobubble generation and its applications in froth flotation (part II): fundamental study and theoretical analysis, Mining Science and Technology, 20, 159-177.
• FURUSAKI S., 2001, The expanding world of chemical engineering. CRC Press,175-176.
• ISO 13320, 2009, Particle size analysis-laser diffraction methods, Part 1, General principals.
• GUPTA A.K., BANERJEE P.K., MISHRA A., SATISH P., 2007, Effect of alcohol and polyglycol ether frothers on foam stability, bubble size and coal flotation, International Journal of Mineral Processing, 82, 126– 137.
• LI S.C., 2001, In cavitation of hydraulic machinery, ICP, London, Chapters 7 and 8.
• HAMPTON M.A., NGUYEN A.V., 2010, Nanobubbles and the nanobubble bridging capillary force, Advances in Colloid and Interface Science, 154, 30–55.
• HENRY W., 1803, Experiments on the quantity of gases absorbed by water, at different temperatures, and under different pressures. Philosophical Transactions of the Royal Society of London 93, 29–274.
• HOLL J. W., 1970, Nuclei and cavitation, Journal of Basic Engineering 92.4 ,681-688.
• JIN F., LI J., YE X., WU Ch., 2007, Effects of pH and ionic strength on the stability of nanobubbles in aqueous solutions of cyclodextrin, Journal of Physical Chemistry, 111, 11745-11749.
• MAZAHERNASAD R., AHMADI R., 2016, Determination of bubble size distribution in a laboratory mechanical flotation cell by a laser diffraction technique, Physicochemical Problems of Mineral Processing, 52, 690-702.
• MOYO P., 2005, Characterization of frothers by water carrying rate, Doctoral Dissertation in Metals and Materials Engineering, McGill University, Montreal, Canada.
• OCONNOR C.T., RANDALL E.W., GOODALL C.M., 1989, Measurement of the effects of physical and chemical variables on bubble size, International Journal of Mineral Processing, 28, 139-149.
• PERRY R.H., GREEN D.W., ACKERS D.E., 2008, Perry's chemical engineers' handbook, McGraw-Hill.
• LAPLACE P.S., 1805, Supplement to the tenth book of the “Traite de Mecanique Celeste”, (in French), Vol. 4, Paris, France, Courcier, 1-79.
• SAYADI H., 2007, Unsteady flow cavity in the water treatment reactors, Ph.D. Dissertation (in Persian), University of Khajeh Nasiroddin Toosi,Tehran, Iran.
• SOBHY A., TAO D., 2013, Nanobubble column flotation of fine coal particles and associated fundamentals, International Journal of Mineral Processing 124, 109-116.
• TAO D., 2004, Role of bubble size in flotation of coarse and fine particles-a review, Separation Science and Technology, 39, 741-760.
• WU Ch., NESSET K., MASLIYAH J., XU Zh., 2012, Generation and characterization of submicron size bubbles, Advances in Colloid and Interface Science, 19, 123–132.
• YANG S., DAMMER S.M., BERMOND N., ZANDVLIET H.J.W., KOOIJ E.S. S., LOHSE D., 2007, Characterization of Nanobubbles on Hydrophobic Surfaces in Water, Langmuir, Vol. 23, 7072-7073.
• YOUNG T., 1805, An essay on the cohesion of fluids, Philosophical Transactions of the Royal Society of London, ,95, 65–87.
• ZHANG M, SEDDON J.R., 2016, Nanobubble–nanoparticle interactions in bulk solutions, Langmuir 32, No. 43, 11280-11286.
• ZHANG X.H., LI G., WU Z.H., ZHANG X.D., HU J., 2005, Effect of temperature on the morphology of nanobubbles at mica/water interface, Chinese Physics, 14 (9).
• ZHANG X.H., MAEDA N., CRAIG V.S.J., 2006, Physical properties of nanobubbles on hydrophobic surfaces in water and aqueous solutions, Langmuir, Vol.22, 5025-5035.
• ZHOU Z.A., XU Z.H., FINCH J.A., MASLIYAH J.H., CHOW R.S., 2009, On the role of cavitation in particle collection in flotation-a critical review II, Minerals Engineering, 22, 419-433.
• ZHOU Z.A., ZHENGHE X.U., FINCH J.A., 1994, On the role of cavitation in particle collection during flotation- A critical review, Minerals Engineering, 7(9), 1073-1084.