Enhancing the dewatering efficiency of iron ore concentrate by agent modification of the magnetite surface
E.D. Chylbak-ool1,2, Yu.V. Konyukhov1, E.S. Permyakova1, B.E. Goryachev1, V.G. Minenko3
1 National University of Science and Technology “MISIS”, Moscow, Russian Federation
2 Bacor STC LLC, Shcherbinka, Russian Federation
3 Institute of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, Moscow, Russian Federation
Russian Mining Industry №2/ 2026 p. 78-84
Abstract: This study aims to address the issue of reduced filtration efficiency of magnetite iron ore concentrates in ceramic disc vacuum filters due to the introduction by mining and processing plants of an additional reverse flotation stage to minimize the SiO2 content in the flotation tails, which requires finer grinding and utilization of dextrin and amines as flotation agents. This work proposes a method for reagent-based modification of the magnetite surface to increase its hydrophilic properties and create conditions for formation of aggregates free of internal closed pores. The study examines the effect of the following flotation agents: starch (alkali-hydrolyzed) in combination with 3-(isodecyloxy)propylamine and polymers (agent A being an anionic polyelectrolyte based on acrylamide and sodium acrylate; agent K being a cation coagulating agent based on polydiallyldimethylammonium chloride) on the wetting and electrosurface properties of the commercial magnetite concentrate (Fe3O4 content of 97+%) and magnetite polished section. The results of measuring the limiting wetting angle, electrode and zeta potentials of the concentrate and the polished sections of magnetite before and after treatment with the examined agents helped to establish that the optimal filtration properties of the concentrate are achieved not by minimizing the individual surface parameters, but by balancing all the three characteristics through a targeted selection of agents. It was found that the cationic polymer (agent K) exhibits a combined mechanism of action, i.e. it neutralizes the negative charge promoting coagulation and simultaneously makes the surface hydrophilic, partially shielding the hydrophobic amine radicals. This makes it the most efficient agent for dewatering flotation magnetite concentrates.
Keywords: iron ore concentrate, magnetite, magnetite filtration, flocculants, zeta potential, electrode potential, wetting angle, surface modification, reverse cationic flotation, concentrate dewatering
For citation: Chylbak-ool E.D., Konyukhov Yu.V., Permyakova E.S., Goryachev B.E., Minenko V.G. Enhancing the dewatering efficiency of iron ore concentrate by agent modification of the magnetite surface. Russian Mining Industry. 2026;(2):78–84. https://doi.org/10.30686/1609-9192-2026-2-78-84
Information about the article
Received: 12.12.2025
Revised: 24.02.2026
Accepted: 25.02.2026
Information about the authors
Evgeny D. Chylbak-ool – Postgraduate Student, National University of Science and Technology “MISIS”, Moscow, Russian Federation; Researcher, Bacor STC LLC, Shcherbinka, Russian Federation; https://orcid.org/0009-0007-9915-4809; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Yury V. Konyukhov – Dr. Sci. (Eng.), Head of the Department of Mineral and Technogenic Raw Materials Processing, National University of Science and Technology “MISIS”, Moscow, Russian Federation; https://orcid.org/0000-0003-0219-4809; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Elizaveta S. Permyakova – Cand. Sci. (Eng.), Assistant at the Department of General and Inorganic Chemistry, National University of Science and Technology “MISIS”, Moscow, Russian Federation; https://orcid.org/0000-0003-2581-0803; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Boris E. Goryachev – Dr. Sci. (Eng.), Professor at the Department of Mineral and Technogenic Raw Materials Processing, National University of Science and Technology “MISIS”, Moscow, Russian Federation; https://orcid.org/0000-0002-5164-5920; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Vladimir G. Minenko – Dr. Sci. (Eng.), Leading Researcher at the Laboratory of Mineral Components Separation Theory, Deputy Director for Research of Department No. 4 on Problems of Comprehensive Extraction of Mineral Components from Natural and Technogenic Raw Materials, Institute of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, Moscow, Russian Federation; https://orcid.org/0000-0001-9117-4310; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
References
1. Dmitrakova U.V., Kruglov A.V., Yushina T.I., Chylbak-Ool E.D. Filtering equipment application practice at Russian enterprises. Obogashchenie Rud. 2021;(4):52–56. (In Russ.) Available at: https://www.rudmet.ru/journal/2039/article/34196/ (accessed: 28.11.2025).
2. Yao J., Ban X., Xie Y., Yin W., Wang Y., Xue F. Research advancement of efficient flotation separation technologies for magnesium-containing minerals. Green and Smart Mining Engineering. 2024;1(2):140–156. https://doi.org/10.1016/j.gsme.2024.05.003
3. Meng Q., Yang M., Zhang Z. Selective separation of magnetite and fayalite based on particle size effect: Flotation behavior and application of stepwise separation process. Separation and Purification Technology. 2025;355(Pt. A):129556. https://doi.org/10.1016/j.seppur.2024.129556
4. Senchenko A.E., Kulikov Yu.V., Zakharov A.G., Ismagilov R.I. Development of a process to upgrade cobber iron concentrate at an iron ore processing plant. Russian Mining Industry. 2024;(5S):158–165. (In Russ.) https://doi.org/10.30686/1609-9192-2024-5S-158-165
5. Volkova G.A., Anufriyev V.N. Intensification of the process of biological treatment of waste waters of milk processing enterprises. Vestnik of Brest State Technical University. Series: Water Engineering, Heat Power and Geoecology. 2019;(2):43–47. (In Russ.) Available at: https://rep.bstu.by/handle/data/3718 (accessed: 28.11.2025).
6. Lavrinenko A.A., Golberg G.Yu. Current state and areas of improving separation processes for suspensions of coal enrichment products using flocculants. Vestnik of Nosov Magnitogorsk State Technical University. 2024;22(2):58–70. (In Russ.) https://doi.org/10.18503/1995-2732-2024-22-2-58-70
7. Ulrich E.V., Barkova A.S. Use of flocculants for wastewater treatment. Ecosystem Transformation. 2023;6(1):168–187. https://doi.org/10.23859/estr-220525
8. Fan Q., Yuan S., Han R., Li Y., He J., Ning X. Desulfurization, desilication, and the separation and recovery of iron from bauxite: A review. Minerals Engineering. 2025;228:109315. https://doi.org/10.1016/j.mineng.2025.109315
9. Arinaitwe E., Pawlik M. A role of flocculant chain flexibility in flocculation of fine quartz. Part I. Intrinsic viscosities of polyacrylamide-based flocculants. International Journal of Mineral Processing. 2013;124:50–57. https://doi.org/10.1016/j.minpro.2013.01.006
10. Dubey A., Patra A.S., Sarkar A.N., Basu A., Tripathy S.K., Mukherjee A.K., Bhatnagar A. Synthesis of a copolymeric system and its flocculation performance for iron ore tailings. Minerals Engineering. 2021;165:106848. https://doi.org/10.1016/j.mineng.2021.106848
11. Bednarek P.S., Kowalczuk P.B. Cellulose and its derivatives as a sustainable reagent in mineral flotation: mechanisms and applications. Separation and Purification Technology. 2025;378(Pt 2):134690. https://doi.org/10.1016/j.seppur.2025.134690
12. Pal S., Patra A.S., Ghorai S., Sarkar A.K., Dasa R., Sarkar S. M Modified guar gum/SiO2: development and application of a novel hybrid nanocomposite as a flocculant for the treatment of wastewater. Environmental Science: Water Research & Technology. 2015;(1):84–95. https://doi.org/10.1039/C4EW00023D
13. Yu J., Wang D., Ge X., Yan M., Yang M. Flocculation of kaolin particles by two typical polyelectrolytes: A comparative study on the kinetics and floc structures. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2006;290(1-3):288–294. https://doi.org/10.1016/j.colsurfa.2006.05.040
14. El-taweel R.M., Mohamed N., Alrefaey K.A., Husien Sh., Abdel-Aziz A.B., Salim A.I. et al. A review of coagulation explaining its definition, mechanism, coagulant types, and optimization models; RSM, and ANN. Current Research in Green and Sustainable Chemistry. 2023;6:100358. https://doi.org/10.1016/j.crgsc.2023.100358
15. Hjorth M., Jørgensen B.U. Polymer flocculation mechanism in animal slurry established by charge neutralization. Water Research. 2012;46(4):1045–1051. https://doi.org/10.1016/j.watres.2011.11.078
16. Illés E., Tombácz E. The role of variable surface charge and surface complexation in the adsorption of humic acid on magnetite. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2003;230(1-3):99–109. https://doi.org/10.1016/j.colsurfa.2003.09.017
17. Konuk M., Sellschopp K., Vonbun-Feldbauer G.B., Meißner R.H. Modeling charge redistribution at magnetite interfaces in empirical force fields. The Journal of Physical Chemistry C. 2021;125(8):4794–4805. https://doi.org/10.1021/acs.jpcc.0c10338
18. Prokhorov K.V., Chibisova M.A., Srivastava A. Structure of an electrochemically activated water film on the pyrite surface. Russian Mining Industry. 2025;(4S):63–67. (In Russ.) https://doi.org/10.30686/1609-9192-2025-4S-63-67
