Abstract
In investigation of the aggregative stability of disperse systems by sediment volumetry, a violation of the structure of water in the contact area causes formation of nanobubbles, whose coalescence leads to appearance of hydrophobic attraction forces. A change in the aggregative stability of aqueous dispersions of particles can be interpreted in such a way that ingress of water molecules having a high potential of interaction with molecules of the medium in the interfacial gap between particle surfaces and outflow of water molecules exhibiting high intensity of interaction with a solid surface from the interfacial gap between particle surfaces is difficult. Excess osmotic pressure between hydrophilic surfaces leads to their hydrophilic repulsion, and excess osmotic pressure of the surrounding water (reduced osmotic pressure between surfaces) leads to hydrophobic attraction of the surfaces. To change the result of flotation, it is sufficient to bring a heat flow to a nanoscale-thick liquid layer, within which action of forces of structural origin is localized, determining the stability of wetting films. To increase the temperature in the interfacial gap between the particle and the bubble using the heat of water vapor condensation, as a gas for flotation, a mixture of air and hot water vapor is proposed. The developed flotation method has been tested in flotation of gold ores. The efficient steam flow rate determined from the results of a factorial experiment is 10.7 × 10–3 kg/(s m2), with the xanthate flow rate being 1.74 g/t. In the rough flotation operation, the jet method of constructing a flowsheet is used, which provides for combination of the initial feed and rough concentrate. In comparison with flotation of ores according to a factory scheme, the yield of a concentrate sent to hydrometallurgical processing is smaller by 23.4 rel. %, with the achieved level of gold recovery remaining the same.
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REFERENCES
Sidorov, I.A., Development of technology for extracting gold from refractory gold concentrates based on the process of ultrafine grinding, Extended Abstract of Cand. Sci. (Eng.) Dissertation, Irkutsk: Irkutsk National Research Technical Univ., 2018.
Aleksandrova, T.N., Afanasova, A.V., and Aleksandrova, A.V., Microwave treatment to reduce refractoriness of carbonic concentrates, J. Min. Sci., 2020, vol. 56, no. 1, pp. 136–141.
Matveeva, T.N., Gromova, N.K., and Lantsova, L.B., Analysis of complexing and adsorption properties of dithiocarbamates based on cyclic and aliphatic amines for gold ore flotation, J. Min. Sci., 2020, vol. 56, no. 2, pp. 268–274.
Gavrilova, T.G. and Kondrat’ev, S.A., Effect of physisorption of collector on activation of flotation of sphalerite, J. Min. Sci.,2020, vol. 56, no. 3, vol. 56, pp. 445–456.
Huaifa, V., Bochkarev, G.R., Rostovtsev, V.I., Veigel’t, Yu.P., and Lu Shoutsi, Intensification of enrichment of polymetallic sulfide ores with high-energy electrons, Fiz.-Tekh. Probl. Razrab. Polezn. Iskop., 2002, no. 5, pp. 96–103.
Chanturiya, V.A., Bunin, I.Zh., Ryazantseva, M.V., Chanturiya, E.L., Khabarova, I.A., Koporulina, E.V., and Anashkina, N.E., Modification of structural, chemical and process properties of rare metal minerals under treatment by high-voltage nanosecond pulses, J. Min. Sci., 2017, vol. 53, no. 4, pp. 718–733.
Algebraistova, N.K., Burdakova, E.A., Romanchenko, A.S., Markova, A.S., Kolotushkin, D.M., and Antonov, A.V., Effect of pulse-discharge treatment on structural and chemical properties and floatability of sulfide minerals, J. Min. Sci., 2017, vol. 53, no. 4, pp. 743–749.
Albrecht, T.W.S., Addai-Mensah, J., and Fornasiero, D., Critical copper concentration in sphalerite flotation: Effect of temperature and collector, Int. J. Miner. Process., 2016, vol. 146, pp. 15–22.
Xu, T. and Sun, C.-B., Aerosol flotation of low-grade refractory molybdenum ores, Int. J. Miner., Metall. Mater., 2012, vol. 19, no. 12, pp. 1069–1076.
Evdokimov, S.I. and Gerasimenko, T.E., Combined gravitation-flotation technology for technogenic gold placer concentration., Izv. Non-Ferrous Metall., 2021, vol. 27, no. 4, pp. 4–15.
Evdokimov, S.I. and Gerasimenko, T.E., Scheme and flotation regime for extracting gold from refractory ores, Vestn. Magnitogorsk. Gos. Tekh. Univ. im. G.I. Nosova, 2021, vol. 19, no. 3, pp. 24–36.
Pchelin, V.A., On modeling hydrophobic interactions, Kolloidn. Zh., 1972, vol. 34, no. 5, pp. 783–787.
Ur’ev, N.B., Physical and chemical dynamics of disperse systems, Usp. Khim., 2007, vol. 73, no. 1, pp. 39–62.
Lu Shou-Tzy, On the role of hydrophobic interaction in flotation and flocculation, Kolloidn. Zh., 1990, vol. 52, no. 5, pp. 858–864.
Churaev, N.V. and Sobolev, V.D., Contribution of structural forces to wetting of quartz surface by electrolyte solutions, Colloid J., 2000, vol. 62, no. 2, pp. 244–250.
Churaev, N.V. and Sobolev, V.D., Prediction of wetting conditions on the base of disjoining pressure isotherms. Computer calculations, Kolloidn. Zh., 1995, vol. 57, no. 6, pp. 888–896.
Deryagin, B.V. and Churaev, N.V., Smachivayushchie plenki (Wetting Membranes), Moscow: Nauka, 1984.
Smith, A.M., Borkovec, M., and Trefalt, G., Forces between solid surfaces in aqueous electrolyte solutions, Adv. Colloid Interface Sci., 2020, vol. 275, p. 102078.
Skvarla, J., Hydrophobic interaction between macroscopic and microscopic surfaces. Unification using surface thermodynamics, Adv. Colloid Interface Sci., 2001, vol. 91, no. 3, pp. 335–390.
Gillies, G., Kappl, M., and Butt, H.-J., Direct measurements of particle-bubble interactions, Adv. Colloid Interface Sci., 2005, vols. 114–115, pp. 165–172.
Xie, L., Wang, J., Lu, Q., Hu, W., Yang, D., Qiao, C., Peng, X., Peng, Q., Wang, T., Sun, W., Lin, Q., Zhang, H., and Zeng, H., Surface interaction mechanisms in mineral flotation. Fundamentals, measurements, and perspectives, Adv. Colloid Interface Sci., 2021, vol. 295, p. 102491.
Hu, P. and Liang, L., The role of hydrophobic interaction in the heterocoagulation between coal and quartz particles, Miner. Eng., 2020, vol. 154, p. 106421.
Mishchuk, N.A., The model of hydrophobic attraction in the framework of classical DLVO forces, Adv. Colloid Interface Sci., 2011, vol. 168, nos. 1–2, pp. 149–166.
Li, Z. and Yoon, R.-H., AFM force measurements between gold and silver surface treated in ethyl xanthate solutions: Effect of applied potentials, Miner. Eng., 2012, vols. 36–38, pp. 126–131.
Wang, J., Yoon, R.-H., and Morris, J., AFM surface force measurements conducted between gold surface treated in xanthate solutions, Int. J. Miner. Process., 2013, vol. 122, pp. 13–21.
Pan, L. and Yoon, R.-H., Measurement of hydrophobic forces in thin liquid films of water between bubbles and xanthate-treated gold surfaces, Miner. Eng., 2016, vol. 98, pp. 240–250.
Sedev, R. and Exerova, D., DLVO and non-DLVO surfaces in foam films from amphiphilic block copolymers, Adv. Colloid Interface Sci., 1999, vol. 83, nos. 1–3, pp. 111–136.
Liu, S., Xie, L., Liu, G., Zhong, H., and Zeng, H., Understanding the hetero-aggregation mechanism among sulfide and oxide mineral particles driven by bifunctional surfactants: Intensification flotation of oxide minerals, Miner. Eng., 2021, vol. 169, p. 106928.
Krasowska, M. and Malysa, K., Wetting films in attachment of the colliding bubble, Adv. Colloid Interface Sci., 2007, vols. 134–135, pp. 138–150.
Theodorakis, P.E. and Che, Z., Surface nanobubbles: A review, Adv. Colloid Interface Sci., 2019, vol. 272, p. 101995.
Nguyen, A.V., Nalaskowski, J., Miller, J.D., and Butt, H.-J., Attraction between hydrophobic surfaces studied by atomic force microscopy, Int. J. Miner. Process., 2003, vol. 72, nos. 1–4, pp. 215–225.
Attard, P., Nanobubbles and the hydrophobic attraction, Adv. Colloid Interface Sci., 2003, vol. 104, nos. 1–3, pp. 75–91.
Simonsen, A.C., Hansen, P.L., and Klösgen, B., Nanobubbles give evidence of incomplete wetting at a hydrophobic interface, J. Colloid Interface Sci., 2004, no. 1, pp. 291–299.
Hampton, M.A. and Nguyen, A.V., Nanobubbles and the nanobubble bridging capillary force, Adv. Colloid Interface Sci., 2010, vol. 154, nos. 1–2, pp. 30–55.
Li, Z. and Yoon, R.-H., AFM force measurements between gold and silver surfaces treated in ethyl xanthate solutions: Effect of applied potentials, Miner. Eng., 2012, vols. 36–38, pp. 126–131.
Ejenstam, L., Ovaskainen, L., Rodriguez-Meizoso, I., Wagberg, L., Pan, J., Swerin, A., and Claesson, P.M., The effect of superhydrophobic wetting state on corrosion protection—The AKD example, J. Colloid Interface Sci., 2013, vol. 412, pp. 56–64.
Zhu, J., Zangari, G., and Reed, M.L., Three-phase contact force equilibrium of liquid drops at hydrophilic and superhydrophobic surfaces, J. Colloid Interface Sci., 2013, vol. 404, pp. 179–182.
Belyaev, A.V. and Vinogradova, O.I., Effective slip in pressure-driven flow past superhydrophobic stripes, J. Fluid Mech., 2010, vol. 652, pp. 489–499.
Liu, S., Xie, L., Liu, G., Zhong, H., and Zeng, H., Understanding the hetero-aggregation mechanism among sulfide and oxide mineral particles driven by bifunctional surfactants: Intensification flotation of oxide minerals, Miner. Eng., 2021, vol. 169, p. 106928.
Hu, P. and Liang, L., The role of hydrophobic interaction in the heterocoagulation between coal and quartz particles, Miner. Eng., 2020, vol. 154, p. 106421.
Huang, K. and Yoon, R.-H., Control of bubble ζ-potentials to improve the kinetics of bubble-particle interactions, Miner. Eng., 2020, vol. 151, p. 106295.
Gunko, V.M., Turov, V.V., Bogatyrev, V.M., Zarko, V.I., Goncharuk, E.V., Novza, A.A., Chuiko, A.A., Leboda, R., and Turov, A.V., Unusual properties of water at hydrophilic/hydrophobic interfaces, Adv. Colloid Interface Sci., 2005, vol. 118, nos. 1–3, pp. 125–172.
Miller, J.D., Wang, X., Jin, J., and Shrimali, K., Interfacial water structure and the wetting of mineral surfaces, Int. J. Miner. Process., 2016, vol. 156, pp. 62–68.
Drost-Hansen, W., Structure of water near solid interfaces, J. Ind. Eng. Chem., 1969, vol. 61, no. 11, pp. 10–47.
Churaev, N.V., Surface forces and physical chemistry of surface phenomena, Usp. Khim., 2004, vol. 73, no. 1, pp. 26–38.
Boinovich, L. and Emelyanenko, A., Wetting and surface forces, Adv. Colloid Interface Sci., 2011, vol. 165, no. 2, pp. 60–69.
Xie, L., Wang, J., Lu, Q., Hu, W., Yang, D., Qiao, C., Peng, X., Peng, Q., Wang, T., Su, W., Liu, Q., Zhang, H., and Zeng, H., Surface interaction mechanisms in mineral flotation: Fundamentals, measurements, and perspectives, Adv. Colloid Interface Sci., 2021, vol. 295, p. 102491.
Smith, A.M., Borkovec, M., and Trefalt, G., Forces between solid surfaces in aqueous electrolyte solutions, Adv. Colloid Interface Sci., 2020, vol. 275, pp. 102078.
Roldughin, V.I., On the unified mechanism of the action of surface forces of different natures, Colloid J., 2015, vol. 77, no. 2, pp. 202–206.
Zheng, J.-M., Chin, W.-C., Khijniak, E., and Pollack, G.H., Surfaces and interfacial water: Evidence that hydrophilic surfaces have long-range impact, Adv. Colloid Interface Sci., 2006, vol. 127, no. 1, pp. 19–27.
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Evdokimov, S.I., Gerasimenko, T.E. Substantiation of Flotation Efficiency under Conditions of Heating of Wetting Films. Russ. J. Non-ferrous Metals 63, 582–593 (2022). https://doi.org/10.3103/S1067821222060074
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DOI: https://doi.org/10.3103/S1067821222060074