Bakor Scientific and Technical Center Ltd. (Moscow, Russia):

B. L. Krasnyi, Dr. Eng., General Director,, e-mail: bakor@nicbakor.ru
I. G. Zimbovskiy, Cand. Eng., Deputy Chief of the Scientific and Research Center on Dewatering and Enrichment, e-mail: zimbovskiy@nicbakor.ru
U. V. Dmitrakova, Scientific Researcher, Scientific and Research Center on Dewatering and Enrichment, e-mail: dmitrakova@nicbakor.ru

National University of Science and Technology “MISiS” (Moscow, Russia):
E. D. Chylbak-ool, Post-Graduate, Dept of Enrichment and Processing of Mineral Resources and Man-caused Raw Mwterials, e-mail: chylbakool.e@mail.ru

At the moment, at domestic enrichment plants processing iron-bearing ores, there is a gradual replacement of old-type dewatering devices, such as fabric vacuum filters, as well as some types of modern dewatering equipment (hyperbaric filters) with ceramic vacuum filters (KDF). For the period 2014-2023, a total of about 120 filters will be replaced at such facilities as Lebedinsky GOK, Mikhailovsky GOK, Karelsky Okatysh, Stoilensky GOK, Central GOK (Ukraine), etc. Ceramic vacuum filters have proven themselves well in the process of dehydration of magnetite concentrates, enabling to reduce the specific power consumption by up to 80%, to increase the specific productivity per square meter of effective filtration area, and also reduce the operating costs of the dehydration process. In addition, KDF filters enable to control the content of residual moisture in the concentrate in order to optimize the pelletizing process next down the chain of processes. Ceramic porous filter elements have a service life of more than 12 months. To maintain such a duration of operation, the filter elements are periodically subjected to a regeneration process, which includes the simultaneous exposure to ultrasonic radiation and chemical reagents (mainly nitric acid at a concentration of 0.5-1%). However, over time, the efficiency of standard regeneration decreases, leading to losses in the specific performance of the ceramic filter elements. To understand the reasons for the decrease in the efficiency of regeneration, work was carried out to study the surface of the filter elements membrane, to determine the mineral composition of particles of both the dehydrated material and its individual components, in order to find an effective solution for the filter elements regeneration.

Scientific and research center of Bakor Scientific and Technical Center Ltd. expresses its gratitude to Kryazhev S. G., Dr. Eng., head of the mineralogy dept. of TsNIGRI and Lukashova M. V., cand. phys.-math., head of the research dept., of “TESKAN” JSC for their assistance in conduction of the researches

1. Putting into practice the new ceramic disk filter at Stoilenskiy mining and concentrating plant. [Electronic resource]. Available at https://www.ntcbakor.ru/articles/novosti/pusko-naladkanovykh-filtrov-kdf-na-stoylenskom-goke/
2. Volovikov А. Yu. Influence of flotation reagents on the filtering properties of ceramic filters during dehydration of iron ore concentrate. Dissertation … of Candidate of Engineering Sciences. 2014. 143 p.
3. Krasnyj B. L., Bondar V. V., Dokhov R. K., Voronin O. V., Sautin A. G., Lebedev N. M. Plant for obtaining filter sediment from suspension, method of regeneration of surface of filter element and device for realization of this method. Patent RF, No. 2223136. Applied: 06.03.2003. Published: 10.02.2004. Bulletin No. 4.
4. Pirkonen P., Grönroos A., Heikkinen J., Ekberg B. Ultrasound assisted cleaning of ceramic capillary filter. Ultrasonics Sonochemistry. 2010. Volume 17. Iss. 6. August. pp. 1060-1065.
5. Pirkonen P., Ekberg B. Ultrasonic. Progress in Filtration and Separation. Elsevier Ltd. 2015. Chapter 9. p. 684.
6. Azorkina Е. V. Kostomuksha ore region (geology, deep structure and mineralogy). Karelian Scientific Center of the RAS. Petrozavodsk. 2015. 322 p.
7. Salmimies R., Kallas J., Ekberg B., Hakkinen A. Oxalic Acid Regeneration of Ceramic Filter Medium Used in the Dewatering of Iron Ore. ISRN Chemical Engineering. 2012. Vol. 22. Article ID 921873. 6 p.
8. Lurye Yu. Yu., Rybnikova А. I. Chemical analysis of industrial waste water. 4^th edition revised and enlarged. Moscow, «Khimiya». 1974. 336 p.
9. Smith J., Sheridan C., van Dyk L., Naik S., Plint N., Turrer H. D. G. Optimal ceramic filtration operating conditions for an iron-ore concentrate. Minerals Engineering. 2018. No. 115. pp. 1-3.
10. Salmimies R. Acidic dissolution of iron oxides and regeneration of a ceramic filter medium. Lappeenranta University of technology. 2012. p. 126.
11. Fakhretdinov R. N. Composition for treatment of bottom hole formation zone. Patent RF, No. 2581859. Applied: 13.05.2015. Published: 20.04.2016. Bulletin No. 11.
12. Rakitkin A. R., Dubovtsev A. S. Composition for removal gypsum containing sediments with inclusions of sulfide and iron oxide. Patent RF, No. 2385339. Applied: 22.08.2008. Published: 27.03.2010. Bulletin No. 9.
13. Krasnyi B. L., Korolev M. N., Zimbovitskiy I. G., Kruglov A. V. Regeneration method for ceramic filter element and composition for its realization. Patent RF, No. 2385339. Applied: 26.02.2020. Published: 28.12.2020. Bulletin No. 11.