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EVALUATION OF ENERGY DENSITY OF POLYMINERAL SANDS OF VARIOUS DEPOSITS
Abstract
Currently, the urgent task associated with the development and production of new, cheaper, building materials. Rocks have a reserve of free internal energy, which is determined by the method of their formation. The use of this energy reserve can reduce the work that needs to be done during the technological transformation of raw materials in the production of building materials. In this paper, it is proposed to evaluate the efficiency of using various finely dispersed systems to use as a criterion - surface activity, which shows the fraction of the potential energy reserve transferred to the surface energy during material disintegration. Assessment of the energy parameters of sedimentary rocks was carried out for the sands of developed deposits in the Arkhangelsk region. Data on the chemical composition of the samples showed that the studied sands are well suited for the preparation of concrete mix. This is due to the presence in the chemical composition of a sufficiently high amount of silica, which is able to form an active amorphous form as a result of crushing of rock. This amorphous component exhibits a pozzolanic effect when hardening concrete. In calculating the energy supply of the rock according to the principles of crystal energy, the atomization energy parameter (Ea), which estimates the thermodynamic strength of the formed bonds between atoms in crystals, was used as a criterion. Since minerals have different composition and complexity components, to compare the atomization energy, it is necessary to use the specific mass (Em) and specific volume atomization energies (EV) parameters. The latter value is the specific volume concentration of the energy of chemical bonds of a substance and can be characterized as energy density (energy density). As a result of the studies and based on the principles of crystal energy, the atomization energy of two sand deposits was calculated, amounting to 1899.53 kJ/mol for the ?Krasnoflotsky-Zapad? field, for the ?Kenitsa? field - 1910.72 kJ/mol. The specific values of the mass and volume energy of atomization (energy density) also have close values. So, for the ?Krasnoflotsky-Zapad? field, Ev = 82.48 kJ/cm3, and for the ?Kenitsa? field, Ev = 80.28 kJ/cm3. The data obtained show that, based on the existing energy classification, the sedimentary rocks under consideration can be attributed to high-energy density (Ev = 60 ? 150 kJ/cm3). Acknowledgments: The reported study was funded by RFBR, project number 19-31-27001.
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