Nadutyy V.P., Korniyenko V.Ya., Chelyshkina V.V. Results of researches of the аmber emersion under combined impact on suspension
- Details
- Parent Category: Geo-Technical Mechanics, 2018
- Category: Collection of scientific papers «Geotekhnicheskaya Mekhanika» Issue 139
Geoteh. meh. 2018, 139, 14-22
DOI: https://doi.org/10.15407/geotm2018.02.014
RESULTS OF RESEARCHES of the Аmber emersion under combined IMPACT on suspension
1NadutyyV.P.,2Korniyenko V.Ya., 1Chelyshkina V.V.
1Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, 2National University of Water Resources and Environmental Management
UDC532.5.011: 622.33: 622.752.3
Language: Russian
Abstract.
Actuality researches of process of hydraulic division of particles of amber-carrier breed in dense suspenzions is related to development of new constructions of classifiers, in particular, spiral hydraulic classifiers in which pulp is exposed to additional influence of vibration and bubbling of air.
According to currently known technologies, small-sized amber with particle size less than 5 mm is not extracted, but is accumulated as waste. Due to this, in particular, mass extraction of amber is only about 50%. The IGTM NAS of Ukraine designed new hydraulic spiral classifiers, which differ by additional impact on the suppression by vibration and barbotage by the air bubbles. Experiments were conducted to determine speed of amber surfacing in suspension, which presented a mixture of amber-bearing rocks and water. The variable factors were density of suspension and parameters of vibration and barbotage. Dependencies between speed and variable factors were obtained by method of multifactorial regression analysis. It is stated that at decreasing degree of the impact, the factors are ranked in the following oeder: density of the medium, amplitude of vibration, frequency of vibration and volume of air for barbotage. It is further stated that applying of the suspension vibration and barbotage gives 2-3 speeding-up of the small class surfacing. Thus, for size 5 mm at density ρ = 1.65 g/cm3, air consumption for bubbling q = 1.11 cm3/s, vibration frequency w = 31-25 Hz and vibration amplitude A = 1.5-2.3 mm, speed of the amber surfacing was 130-140 mm/s. This is 3.5 times faster than when amber is surfaced in suspension with the same density but without vibration and barbotage.
By the method of multifactor regressive analysis is collected the generalized dependence of speed of emerging from four variable factors which in order of decrease of degree of influencing are disposed as follows: closeness of suspension, amplitude, frequency of vibration, volume of air for barbotage.
The results of determining speed of the amber surfacing can be used for calculating operating parameters of the device and are the basis for calculation of design of hydraulic classifiers for complex impact.
Key words: amber, suspension density, surfacing speed.
References:
1. Nadutiy, V.P., Chelyshkina, V.V., Suhariev, V.V. Korniyenko, V.Ya., Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (2015), Vibratcziynyyklasifikator [Vibration Classifier], State Register of Patents of Ukraine, Kyiv, Ukraine, Pat. 102869.
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About the authors:
Nadutyy Vladimir Petrovich, Doctor of Technical Sciences (D.Sc.), Professor, Head of Department of Mechanics of Mineral Processing Machines and Processes, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM NASU), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Korniyenko Valeriy Yakovlevich, Ph.D. (Tech.), Candidate of Technical Sciences (Ph.D.), Associate Professor of National University of Water Resources and Environmental Management (NUWREM), Dnepr, Ukraine.
Chеlyshkina Valentina Vasilievna, Ph.D. (Tech.), Senior Researcher of Department of Mechanics of Mineral Processing Machines and Processes, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM NASU), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
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