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Belyaev E.V.,Central Research Institute for Geology of Industrial Minerals
Russian Geology and Geophysics | Year: 2010

The paper discusses the important and urgent problem of enlarging the mineral resources of Russia. Volcanosedimentary complexes of greenstone belts are suggested as a new alternative source of apatite ores. The distinguishing features and minerageny of greenstone complexes in the Karelian, Aldan, and Anabar Shields have been considered. Apatite occurrences have been described in brief. The paper suggests the main lines of study and geological exploration of apatite-bearing metavolcanic sedimentary complexes. © 2010. Source


Khasanova N.M.,Kazan Federal University | Nizamutdinov N.M.,Kazan Federal University | Khasanov R.A.,Central Research Institute for Geology of Industrial Minerals | Salimov R.I.,Kazan Federal University
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM | Year: 2014

The purpose of this work is to study geochemical features in the contact zone of gypsum - carbonate deposits by the electron paramagnetic resonance (EPR) method on the example of the typical core samples Syukeevskogo field. Choosing the annealing temperature of 350, 600 and 950 °C is associated with decomposition of organic matter and carbonates. Five different kind contact zones of gypsum-carbonate strata Syukeevskogo field along the borehole were selected. Quantitative changes of the EPR parameters: Mn2+, Fe3+, Cr3+, α and radicals caused by thermochemical effects on the rock and organic matter are presented in the diagram forms. Geochemical features installed in the contact zones such as a manganese increase in the newly formed calcite, a decrease α in sample oil-saturated, a reason of calcium excess or magnesium deficiency at increase alpha are discussed. © SGEM2014. All Rights Reserved. Source


Khasanova N.M.,Kazan Federal University | Nizamutdinov N.M.,Kazan Federal University | Sitdikova L.M.,Kazan Federal University | Morozov V.P.,Kazan Federal University | And 3 more authors.
Neftyanoe Khozyaystvo - Oil Industry | Year: 2015

The method of electron paramagnetic resonance (EPR) was used to identify the characteristics of the material composition and condition of the organic matter of rocks along the borehole domanic deposits. EPR spectra of impurity ions Mn2+, sulfate ion radical SO3 - and SO2 - structure of calcite, E'-center quartz structure, and also vanadyl VO2+ and free radical Corg organic substances were identified in 11 specimens Domanic rock deposits. Diagrams of the EPR signals were built along the borehole. Source


Rakhimova N.R.,Kazan State University of Architecture and Engineering | Rakhimov R.Z.,Kazan State University of Architecture and Engineering | Naumkina N.I.,Central Research Institute for Geology of Industrial Minerals | Khuzin A.F.,Kazan State University of Architecture and Engineering | Osin Y.N.,Kazan Federal University
Cement and Concrete Composites | Year: 2016

The influence of the fineness, concentration, and chemico-mineralogical composition of limestone on the workability, reaction kinetics, compressive strength, microstructure, and binder gel characteristics of sodium carbonate–based waste-activated waste slag cement pastes was investigated in this work. Alkali-activated slag cements incorporated with limestone, containing 33–100% of calcite, at a content of up to 60% with a 28-day compressive strength of 26.2–48.8 MPa were proposed. The main reaction products of hardened alkali-activated cement pastes and those incorporated with limestone are [Formula presented], CaCO3, Na2Ca(CO3)2·5H2O, and Na2CaSiO4. “Physically active” limestone does not chemically react with the binder gel but it can improve the physical structure. The higher packing density of mixed cement, without an increase in the water demand, the satisfactory binding strength of limestone with the binder gel lead to the improvement in the physical structure and compressive strength of alkali-activated slag paste. © 2016 Elsevier Ltd Source


Rakhimova N.R.,Kazan State University of Architecture and Engineering | Rakhimov R.Z.,Kazan State University of Architecture and Engineering | Osin Y.N.,Kazan Federal University | Naumkina N.I.,Central Research Institute for Geology of Industrial Minerals | And 3 more authors.
Journal of Nuclear Materials | Year: 2015

The solidification of nitrate solutions with alkali-activated slag (AASC) and slag-metakaolin cements (AASMC) and the resulting setting times, compressive strengths, dimensional stability, water resistance, hydration products, microstructures, and macroporous network structures were evaluated. The influences of the alkali activator concentration, mineral composition of metakaolin, ratio of slag to slag + metakaolin, and concentration of NaNO3 on the cement performance were all evaluated in detail. The compressive strength of cemented nitrate solutions with AASC and AASMC aged for 28 days was from 13.4 to 42 MPa depending on the NaNO3 concentration. X-ray diffractometer, differential thermal analyzer, and electron microscope analyses suggested that NaNO3 crystallizes in cementitious matrices without reacting with the hydration products of AASC and AASMC. X-ray microtomography showed that the solidified NaNO3 solution with a salt concentration of 700 g/l and AASC had a denser microstructure without shrinkage microcracks, a smaller macropore volume, and smaller macropore sizes than hardened AASC-based paste mixed with water. © 2014 Elsevier B.V. All rights reserved. Source

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