Nadutyy V.P., Chelyshkina V.V. Development of mathematical models of process of the tuff softening at its watering

Details
Parent Category: Geo-Technical Mechanics, 2018
Category: Collection of scientific papers «Geotekhnicheskaya Mekhanika» Issue 140

Geoteh. meh. 2018, 140, 31-41

DOI:  https://doi.org/10.15407/geotm2018.03.031

DEVELOPMENT OF MATHEMATICAL MODELS OF PROCESS OF THE TUFF SOFTENING AT ITS WATERING

1NadutyyV.P., 1Chelyshkina V.V.

1Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine

UDC532.5.011: 622.33: 622.752.3

Language: Russian

Abstract.

Today tufy obtains in a small volumes, but a their application field is very wide. The basalt zeolite-smectite tuffs of the Rivne-Volyn region are valuable raw materials containing potassium-magnesium salts, copper, iron, titanium, cobalt. The IGTM NAS of Ukraine is developing a complex non-waste technology for extracting metal fraction from tuff, while waste is proposed to be used in traditional for the tuff spheres: agriculture, construction, medicine, biology. The article presents results of the studies of method for preparing raw material for processing by way of tuff softening and water saturation.  On the basis of experimental studies of moisture absorption and strength characteristics, the mathematical models were developed for predicting process of tuff softening. It is found that when tuff is saturated with water for 7 days, moisture content in it increases by 11.4 % on the average, up to a maximum of 15%, while its strength decreases from 120.5 MPa to 5.02 MPa, which is 4-5% of initial raw material strength. The main change occurs in the first day of moistening. Mathematical model of increasing of moisture content depending on duration of the moistening is a quadratic parabola, the argument of which is a complex function. Analytical dependences of strength decrease and rate of hardness indentation on moisture content and time are, in general, of a logarithmic character. An algorithm is proposed for calculating of moisture content and strength parameters.

The process of ore dressing of tuff by moistening is perspective at the booty of tufov, both from ordinary and technogen deposits. The expense of water makes 10-12% from mass of breed. It is thus taken into account, that, for example, in the dumps of basaltic quarries, unlike a tuff, the other  breeds are a basalt, quartz, lavobrekchyya,  water is not practically taken in. Due to it is substantial soften tuff mass unlike the other breeds. It creates terms for the selective extraction of tuff from the dumps of quarries, for example, by vibration screening on a small class (-2,5 + 2,0 mm), if necessary, with the preliminary crushing in a roll crusher.

Keywords: mathematical model, softening of tuff, watering, ore-preparation.

References:

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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.

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.