Bulat A. F., Nadutyi V.P., Chelyshkina V.V., Kurilov V.S. Determination of characteristic properties of mineral suspension for calculating the particle veLocity (2)
- Деталі
- Батьківська категорія: Геотехнічна механіка, 2020
- Категорія: Геотехнічна механіка, 2020, № 152
Geoteh. meh. 2020, 152, 172-183
https://doi.org/10.15407/geotm2020.152.172
DETERMINATION OF CHARACTERISTIC PROPERTIES OF MINERAL SUSPENSION FOR CALCULATING THE PARTICLE VElOCITY
1Bulat A. F., 1NadutyiV.P., 1ChelyshkinaV.V., 1Kurilov V.S.
1Institute of Geotechnical Mechanics named by N. Poliakov of NАS of Ukraine
UDC 532.5.011: 622.33: 622.752.3
Language: Russian
Annotation.
Calculations of hydraulic devices for separating mineral suspensions and extracting valuable components and waste are based on determining the speed of constrained deposition and surfacing of particles. When determining the speed, it is necessary to know such characteristics of the suspension as viscosity, porosity, density. The article offers a method for analytical calculation of these indicators. Its peculiarity is that the definition of these characteristics is associated with only one parameter – the volume density of the medium (substance). It is easily determined in practice by weighing a sample of suspension in a container of a known volume. This method is illustrated by the characteristics of two water-based mineral suspensions: with a solid particle density of 2.55 g / cm3 (ash and slag waste from a thermal power plant) and a density of 2.0 g/cm3 (crushed tuff). For these suspensions, the approximate dependences of these characteristics on the density of the medium (substance) are established. It is established that the application of the most common suspension model in the form of a discrete cellular structure provides acceptable limitations of the studied characteristics. The obtained values are within the scope of typical indicators of mineral pulps in the working zone of hydro-classifiers and hydro-separators. However, a number of well-known formulas for the speed of restricted movement that use this model are unacceptable for calculating hydraulic devices since they take into account inflated values of characteristics. The described method can be used for dispersed systems of two or more phases, for example, using weighted average values of components. The proposed method for calculating the characteristics of suspensions is suitable for practical use, given that the hydraulic apparatus receives already classified raw materials and the particles have a small variation in shape and size. The obtained analytical dependences of suspension characteristics on density are used for calculating speed of both constrained and free movement of particles, which is the basis for determining technological and design parameters in the design of hydraulic devices and apparatuses.
Keywords:
particles, suspension, viscosity, porosity, density
References
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About the authors
Bulat Anatolii Fedorovych, Doctor of Technical Sciences (D.Sc.), Professor, Head of M.S. Poliakov Institute of Geotechnical Mechanics of National Academy of Sciences of Ukraine (IGTM, NASU), Dnipro, Ukraine
Nadutyi Volodymyr Petrovych, Doctor of Technical Sciences (D.Sc.), Professor, Head of the Department of Mechanics of Mineral Processing Machines and Processes, M.S. Poliakov Institute of Geotechnical Mechanics of National Academy of Sciences of Ukraine (IGTM, NASU), Dnipro, Ukraine, Ця електронна адреса захищена від спам-ботів. вам потрібно увімкнути JavaScript, щоб побачити її.
Chеlyshkina Valentyna Vasylivna, Candidate of Technical Sciences (Ph.D.), Senior Researcher in the Department of Mechanics of Mineral Processing Machines and Processes, M.S. Poliakov Institute of Geotechnical Mechanics of NAS of Ukraine (IGTM, NASU), Dnipro, Ukraine, Ця електронна адреса захищена від спам-ботів. вам потрібно увімкнути JavaScript, щоб побачити її.
Kurilov Vladyslav Sergiiovych, Doctoral Student in the Department of Mechanics of Mineral Processing Machines and Processes, M.S. Poliakov Institute of Geotechnical Mechanics of NAS of Ukraine (IGTM, NASU), Dnipro, Ukraine, Ця електронна адреса захищена від спам-ботів. вам потрібно увімкнути JavaScript, щоб побачити її.