STC Bakor Ltd., Moscow, Russia:

E. D. Chylbak-ool, Engineer, e-mail: chylbak-ool@ntcbakor.ru
A.V. Kruglov, Head of the Research Center for Innovative Solutions for Dewatering and Benefication, e-mail: kruglov@ntcbakor.ru
U. V. Dmitrakova, Researcher, e-mail: dmitrakova@ntcbakor.ru

National University of Science and Technology “MISiS”, Moscow, Russia:
T. I. Yushina, Head of the Chair for Benefication and Processing of Mineral Resources and Technogenic Raw Materials, Candidate of Technical Sciences, Associate Professor, e-mail: yuti62@mail.ru

The results of the study of filtration of hard-to-filter concentrates of minerals, such as nickel and copper concentrates, tailings of concentration plants, are presented. Filtration tests of a slurry containing fibrous ceramics for production of filters for filtering hot gases have also been carried out. The dependence of filterability of the material on its granulometric composition was determined. Filtration on a vacuum ceramic disc filter is more effective on suspensions containing up to 10% of fines (–3 (5) +0 μm). The suspension, containing from 10 to 25% of fines, characterizes the conditional boundary of application of vacuum filtration and press filtration technology. With a further increase in the content of the fine fraction, the cake obtained on the ceramic vacuum filter becomes plastic and its moisture content is higher than that obtained on the press filter. In the course of research work aimed at determining the optimal type of filtering baffle for dehydration of sulfide copper concentrate, the dependence of cake moisture on the specific air permeability of the fabric was determined. The experiments were carried out on a laboratory setup simulating the operation of a press filter, which was delivered by a suspension of copper sulfide concentrate from two processing plants. After processing the data, the dependence was obtained, according to which it is possible to select the type of filtration fabric based on the requirements for cake moisture. Also, the dependence of the moisture content of the resulting cake of some concentrates and products on the density of the fabric used was noted. For example, filtration of tailings from enrichment of tin ores with a high clay content can only be carried out with the high density fabric. The cake is dry (in terms of organoleptic properties) and crumbly, even when the moisture content in the sediment is more than 50%. This is due to the fact that moisture associated with clay minerals cannot be removed by filtration in principle. Further dehydration is only possible during the drying process.

1. Krasny B. L., Tarasovskiy V. P., Krasny А. B., Omarov А. Yu. Quantitative analysis of the pore structure of ceramics using computer analysis of the SEM image. Novye orgneupory. 2013. No. 8. pp. 40–44.
2. He J., Li X., Su D., Ji H. Ultra-low thermal conductivity and high strength of aerogels/fibrous ceramic composites. J. Eur. Ceram. Soc. 2016. Vol. 36, No. 6. pp. 1487–1493.
3. Liu D., Hu P., Zhao G., Han W. Silica bonded mullite fiber composite with isotropic geometry and properties for thermal insulating. J. All and Comp. 2017. Vol. 728. pp. 1049–1057.
4. Abyzov А. М. Recent research in the field of creating high-quality alumina ceramics (review). Part 2. Synthesis and sintering of nanopowders, sol-gel and other methods of obtaining finely dispersed fibrous aluminum oxide. Steklo i keramika. 2018. No. 9. pp. 23–35.
5. Buznik V. М., Grashenkov D. V., Bespalov А. S., Ivanov V. К. et. al. New approaches to modifying highly porous ceramic materials. Nanostructured materials: technologies, properties, applications. Collection of scientific articles. 2017. С. 144–162.
6. Martynenko V. V., Gaodu А. N., Zhukov Z. L. Influence of the type of binder on properties of refractory glass fiber thermal insulation products. Issledovatelskie raboty. 1999. No. 4. pp. 42–45.
7. Boyang Li, Dobosz K. M., Zhang H., Schiffman J. D., et al. Predicting the performance of pressure filtration processes by coupling computational fluid dynamics and discrete element methods. Chemical Engineering Science. 2019. Vol. 208.
8. Udovitskiy V. I., Frolov D. V. Analysis of methods to determine the effectiveness of action of polymer flocculants in processes of dehydration of coal sludge and their enrichment products. Vestnik Kuzbasskogo gosudarstvennogo tekhnicheskogo universiteta. 2018. No. 1. pp. 14–19.
9. Kozhonov А. К., Molmakova М. S., Duyshonbaev N. P. Identification of possible causes of problems in dewatering flotation products. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta imeni G. I. Nosova. 2018. Vol. 16, No. 3. pp. 17–24.
10. Dmitrakova U. V., Kruglov А. V., Yushina Т. I. Improvement of efficiency of the dehydration process for non-ferrous metal ores. Scientific foundations and practice of processing ores and technogenic raw materials: materials of the XXIV International Scientific and Technical Conference. Yekaterinburg, 2019. pp. 179–184.
11. Khalapyan S. Yu., Anpilov А. О. The use of neural network technologies for organization of indirect measurements in the control system for dehydration of iron ore concentrate. Gorny informatsionno-analiticheskiy byulleten. 2017. No. 12. pp 195–200.
12. Volovikov А. Yu. Experimental setup to study the process of dehydration of iron ore concentrate using vacuum disc filters. Gorny informatsionno-analiticheskiy byulleten. 2013. No. 8. pp. 300–303.
13. Bähner F. D., Santacoloma P. A., Abildskov J., Huusom J. K. Analysis and Modelling of an Industrial Pressure Filtration using Process Data. IFAC (International Federation of Automatic Control). PapersOnLine. 2017. Vol. 50, Iss. 1. pp. 12137–12142.
14. Tkachenko S. V., Khomichak L. М., Verchenko L. М., Sheyko Т. V. et. al. The relevance of determining the filtration rate of intermediate products of sugar production under pressure. Sakhar. 2017. No. 3. pp. 42–47.