Olga Sharonova

Olga Sharonova
Russian Academy of Sciences | RAS · Institute of Chemistry and Chemical Technology

PhD

About

57
Publications
2,748
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380
Citations
Citations since 2017
16 Research Items
217 Citations
2017201820192020202120222023010203040
2017201820192020202120222023010203040
2017201820192020202120222023010203040
2017201820192020202120222023010203040
Additional affiliations
January 1992 - present
Russian Academy of Sciences
Position
  • Institute Of Physical Materials Science, Siberian Branch of the Russian Academy Of Sciences

Publications

Publications (57)
Article
Industrial high-calcium fly ashes obtained by burning Kansk-Achinsk coal at a thermal power plant and selected from different fields of electrostatic precipitators of an ash collecting plant were studied as the basis for composite binders (CB). The main factors influencing the properties of such CBs are the particle size, the concentration of super...
Article
The binding properties of high-strength and ultra-high-strength composite ash-cement materials were studied with the replacement of Portland cement (PC) by 80–90% with fine high-calcium fly ash (HCFA), selected from the 4th field of the electrostatic precipitators of the ash collection unit. For effective dispersion, the addition of polycarboxylate...
Article
Full-text available
Composite materials (CM) were obtained on the basis of fine- dispersed high-calcium fly ash (HCFA), selected from the 4th field of electrostatic precipitators of Krasnoyarsk TPP-2, with the addition of Melflux 5581F superplasticizer at the water: binder ratio W/B = 0.25. The influence of the concentration of superplasticizer in the range 0.06-0.6 w...
Article
Full-text available
Magnetic sorbents were prepared by addition of ferrospheres to zirconia-silica gel followed by thermal treatment at 500 °C. The ferrosphere narrow fraction E -0.063+0.050 mm from fly ash resulted from combustion of Ekibastuz coal was used as a magnetic component. The surface of magnetic composites was additionally functionalized by grafting of – PO...
Article
Full-text available
The high-calcium fly ashes (HCFA) of Krasnoyarsk TPP-2, Russia were studied. The HCFA were selected from each of the 4 fields of the electrostatic precipitator. It was determined that the size distribution, chemical and quantitative phase composition vary significantly from 1st to 4th EF field. The fine high-calcium fly ash (d90 < 10 microns) selec...
Article
The combination of factors was established for using high-calcium fly ash (HCFA) as a binder material of high early and long-term strength: (1) high dispersity of microspherical HCFA, 90% <10 μm; (2) the positive effect of polycarboxylate superplasticizer, that allowed to use water / binder = 0.25; (3) formation of finely mixed hydrate phases such...
Article
The structure–composition relationship for polished sections of individual platelike ferrospheres in the–0.04 + 0.032 mm size fraction isolated from fly ash from the combustion of brown coal has been studied systematically by scanning electron microscopy and energy dispersive X-ray spectroscopy. We have identified groups of globules whose overall c...
Article
Full-text available
Polished sections of individual ferrospheres 30 to 40 μm in size, with single-block and blocky structures and a variable glass phase content, have been studied using a scanning electron microscope equipped with an energy dispersive X-ray spectrometer system. The results demonstrate that the single-block globules consist of sintered magnetite crysta...
Article
Full-text available
The composition was studied of calcium aluminosilicate microspheres of three morphological types in high-calcium fly ash from combustion of brown coal from the Kansk-Achinsk basin in slag-tap boilers at temperatures from 1400 to 1500°С and sampled in the first field of electrostatic precipitators at the Krasnoyarsk Cogeneration Power Station no. 2...
Article
Full-text available
Изучен состав кальцийалюмосиликатных микросфер трех морфологических типов в высококаль-циевой летучей золе, полученной при сжигании бурого угля Канско-Ачинского бассейна в котлах сжидким шлакоудалением при температурах 1400–1500°С и отобранной с первого поля электро-фильтров Красноярской ТЭЦ-2. С применением методов растровой электронной микроскопи...
Article
An affine sorbent of the “core–shell” type was prepared on the basis of fly ash ferrospheres with the aluminosilicate glass phase content of 41 wt % as a magnetic core. The synthesis of the functional coating included four steps: the steam treatment of the fraction, the synthesis of a mesoporous silica coating on the ferrospheres surface, the surfa...
Article
Full-text available
Magnetic Ni(2+)-zeolite/ferrosphere and Ni(2+)-silica/ferrosphere beads (Ni-ferrosphere beads - NFB) of a core-shell structure were synthesized starting from coal fly ash ferrospheres having diameters in the range of 0.063-0.050 mm. The strategy of NFB fabrication is an oriented chemical modification of the outer surface preserving the magnetic cor...
Article
We have studied the composition of three types of individual spheres differing in microstructure (single-block, platelike, and skeletal–dendritic spheres) in the–40 + 32 μm size fraction of ferrospheres containing 92.72 wt % FeO. The results demonstrate that the single-block spheres have the highest Fe content (95–97% FeO), a basicity factor M b >...
Article
Finding new low-cost catalysts, especially ones that can be used in cracking, is a problem of great interest in the refining of heavy oils. The activity of redox catalysts based on coal fly ash ferrospheres is examined for the cracking of two types of heavy oils (paraffin and asphaltenic), and for paraffin oil residue under autoclave conditions. It...
Article
Full-text available
Eight fractions of ferrospheres in a range of sizes from 0.4 to 0.02 mm recovered from high-calcium fly ash have been studied. The major component composition of obtained fractions can be described by two linear regression equations, [CaO] = 54.50 – 0.54[FeO] and [SiO2] = 27.71 – 0.29[FeO] with the correlation coefficients of −0.96 and −0.88, respe...
Article
A systematic study has been carried out on the relationship between the composition, morphology, and structural characteristics of iron-containing phases of 25 narrow fractions of ferrospheres with the Fe2O3 content in the range 30-92 wt.%, which are separated from four known (S, FS, CS, and FCS) types of fly ashes. It has been established that the...
Article
We report a systematic study of the interrelationship between the composition and microstructure of ferrospheres isolated from all known types of power plant fly ash. Our results demonstrate that the macro-component composition of narrow ferrosphere size fractions corresponds to the compositions of the phase boundaries between the primary crystalli...
Article
Full-text available
This paper reports on the results of the investigation of fly ashes from pulverized combustion of coals of two ranks, i.e., the B2 (sub C) rank, which is taken from Fields 1−4 of the electrostatic precipitators at the BSDPS -1 (the Bfa series), and the T (sa) rank, which is taken from Fields 1 and 2 of the electrostatic precipitators at the MPP-22...
Article
High-calcium fly ash middlings of brown coal of B2 (sub C) rank from the Berezovsky coal mine within the Kansk-Achinsk Basin were studied. The middlings were selectively sampled from the convection pass, the fore-hearth and each of the 4 fields of the electrostatic precipitator at the coal-fired power plant BSDPS-1. The differences of the dispersit...
Article
A comparative investigation of the composition and the morphology of char particles was conducted: char particles were recovered from fly ashes of two power stations in Russia from burning of high- and low-reactivity high-ash coals; the known results of studies of char particles generated in laboratory conditions from coals characterized according...
Article
Full-text available
The possibility of immobilizing liquid radioactive wastes into polyfunctional microspherical materials of the block and powdered types is demonstrated. These materials are intended for reprocessing radioactive wastes of different compositions and make it possible to perform a multistage process of conditioning radioactive wastes under relatively mi...
Article
Phase composition of six narrow size fractions of microspheres extracted from fly ashes of Ekibastuz coals has been determined by Mssbauer spectroscopy. The basic phase is defect magnetite substituted by Al, Mg, and Ti ions. The magnetic properties of microspheres depend on the content of iron and its distribution over spinel positions.
Article
Full-text available
Granulometric and chemical composition of the ash-and-slag wastes (ASW) of fuel-bed firing of the brown coal from the Kangalas field of the Len a basin was investigated. The ash-and-slag material was separated by means of magnetic separation of the granulometric and hydrodyn amic classification. The content of rare elements (RE) and rare-earth elem...
Article
The possibility of solidifying liquid radioactive wastes containing cesium and strontium radionuclides into framework aluminosilicates of the feldspar (anorthite) and feldspathoid (nepheline) types with the use of porous glass-ceramic matrices based on coal fly ash cenospheres is demonstrated. Cesium and strontium are immobilized through solid-phas...
Article
Full-text available
The phase composition of magnetic microspheres isolated from Ekibastuz coal fly ash in six narrow size ranges is determined by Mssbauer spectroscopy. The major phase in the microspheres is nonstoichiometric, cation-substituted (Al, Mg, and Ti) magnetite. Their magnetic properties are shown to depend on the Fe content and cation distribution over th...
Article
The phase composition of magnetic microspheres isolated from Ekibastuz coal fly ash in six narrow size ranges is determined by Mössbauer spectroscopy. The major phase in the microspheres is nonstoichiometric, cation-substituted (Al, Mg, and Ti) magnetite. Their magnetic properties are shown to depend on the Fe content and cation distribution over t...
Article
The phase composition of magnetic microspheres isolated from Ekibastuz coal fly ash in six narrow size ranges is determined by Mössbauer spectroscopy. The major phase in the microspheres is nonstoichiometric, cation-substituted (Al, Mg, and Ti) magnetite. Their magnetic properties are shown to depend on the Fe content and cation distribution over t...
Article
Full-text available
Using a multi-stage scheme including different sequences of the stages of magnetic separation, hydrodynamic and granulometric classification, magnetic microspheres of fixed composition containing the magnetic constituent at the level of 95_99 % were separated from the fly ash of coal from the Ekibastuz and Kuznetsk basins. The yield, texture charac...
Article
Magnetic microspheres and cenospheres (hollow silica-alumina microspheres) of fixed composition and purity in the range of 96-99% were recovered from fly ash of power plants burning the Irsha-Borodinskii lignite and coals of Kuznetsk and Ekibastuzk basin by the multi-step process including the different combination of magnetic separation, hydrodyna...
Article
Full-text available
Solidification of liquid radioactive waste, and other hazardous wastes, is accomplished by the method of the invention by incorporating the waste into a porous glass crystalline molded block. The porous block is first loaded with the liquid waste and then dehydrated and exposed to thermal treatment at 50-1,000.degree. C. The porous glass crystallin...
Article
Full-text available
An open-cell glass crystalline porous material made from hollow microspheres which are cenospheres obtained from fly ash, having an open-cell porosity of up to 90 vol. % is produced. The cenospheres are separated into fractions based on one or more of grain size, density, magnetic or non-magnetic, and perforated or non-perforated. Selected fraction...
Conference Paper
This paper describes test results for immobilization of surrogate radioactive actinide solutions. A glass crystalline porous material, Gubka, or “sponge” in Russian, was tested to immobilize surrogates of two types of actinide solutions, which exist in the DOE complex. Solutions using uranium as a surrogate for plutonium were stabilized in the poro...
Article
This paper describes test results for immobilization of surrogate radioactive actinide solutions. A glass crystalline porous material, Gubka, or "sponge" in Russian, was tested to immobilize surrogates of two types of actinide solutions, which exist in the DOE complex. Solutions using uranium as a surrogate for plutonium were stabilized in the poro...
Article
Full-text available
This paper describes the results of a joint research program of Russian institutes at St. Petersburg, Krasnoyarsk and Zheleznogorsk and the Idaho National Engineering and Environmental Laboratory to develop a new material for stabilizing radioactive solutions and other uses, such as high-temperature catalysis. An open-cell glass crystalline porous...
Article
New catalysts designed as glass crystal microspheres were studied by XPS, SEM, XRD and Mossbauer spectroscopy. The data obtained indicated that after treatment of catalysts with HF the fluorination of lattice took place leading to stabilization of Fe3O4 phase. The catalytic activity of initial catalysts and catalysts already treated with HF in the...
Article
The forms of SO2 adsorption and their location in two samples of zeolites Na, HY with differentSi/Al ratio and Na content were studied by X-ray powder diffraction (XRPD) and t.p.d. Two types of adsorbed species were distinguished. Strongly held SO2 (Tdes = 390 K) is formed due to interaction of SO2 with cations. It was shown by XRPD that strongly h...
Article
SO2 and H2O interaction on TiO2 (anatase) surface was studied by IR-spectroscopy and temperature-programmed desorption technique. SO2 is adsorbed on TiO2 in three species. Weakly bonded species characterized by 1330 and 1141 cm-1 bands and thermal stability of approximately 300 K are displaced partially by water from the anatase surface and interac...
Article
SO2 and H2O interaction on TiO2(anatase) surface was studied by IR-spectroscopy and temperature-programmed desorption technique. SO2 is adsorbed on TiO2 in three species. Weakly bonded species characterized by 1330 and 1141 cm−1 bands ∼ and thermal stability of 300 K are displaced partially by water from the anatase surface and interacts with H2O f...
Article
Full-text available
Sulfur dioxide is adsorbed on zeolites Y in two forms. The amount of the stable form (Tdes=350–390 K) changes in proportion to the sodium content in the zeolite The stable form is localized in a large void at a distance of 1.8 from the SII position and causes redistribution of sodium cations. The weakly bound form (Tdes=286–300 K) makes the main co...
Article
Radioactive solutions requiring stabilization exist in various compositions throughout the DOE complex. Future cleanup could generate additional actinide residue solutions requiring stabilization at facilities where processing capabilities have been dismantled. Radiological laboratory standard solutions (liquid technical standards) have recently be...
Article
Full-text available
Radioactive solutions requiring stabilization exist in various compositions throughout the DOE complex. Future cleanup could generate additional actinide residue solutions requiring stabilization at facilities where processing capabilities have been dismantled. Radiological laboratory standard solutions (liquid technical standards) have recently be...
Article
Full-text available
The investigation has been conducted on high calcium fly ash products selectively sampled at five points in the ash collecting system (a fore-hearth and fields 1–4 of electrostatic precipitators (EPs)) of the facilities for pulverized burning of two brown coals of B2 (sub C) rank in boiler units with bottom ash removal and slag-tap removal. Differe...
Article
Full-text available
A systematic investigation the relationship between the composition, morphology, structural characteristics of iron-containing phases, and catalytic properties of narrow fractions of ferrospheres separated from four known types of fly ashes has been performed. It has been established that the major component compositions of all the studied narrow f...

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