Vsevolod Mymrine - Academia.edu (original) (raw)

Papers by Vsevolod Mymrine

Черная металлургия, Jul 10, 2020

Аннотация. В ПАО "Ижсталь" непрерывнолитые заготовки сечением 125×125 и 140×180 мм разливаются на... more Аннотация. В ПАО "Ижсталь" непрерывнолитые заготовки сечением 125×125 и 140×180 мм разливаются на МНЛЗ радиального типа производства фирмы STS, Италия. При разливке закрытой струей в кристаллизаторах рекомендованы к использованию импортные шлакообразующие смеси (ШОС) марок Steelin ML/P-280, Steelin ML/LM-280, Steelin ML/HC-230. В настоящее время в связи с импортозамещением на заводе проводятся опытно-промышленные испытания ШОС отечественного производства. Для обеспечения стабильности процесса разливки и получения качественной непрерывнолитой заготовки важно знать эксплуатационные свойства ШОС, описываемые параметрами интервала плавления, который характеризуется температурами размягчения и плавления ШОС. От величины этих характеристик зависит толщина слоя жидкого шлака на поверхности жидкой стали в кристаллизаторе МНЛЗ. Указанные свойства смесей определяли методом дифференциального термического анализа на автоматизированной установке ВТА-983. Регистрируемым параметром служила разность температур между образцом и эталоном, измеряемая при нагреве или охлаждении с постоянной скоростью. Методом дифференциального термического анализа (ДТА) определены температуры размягчения и плавления гранулированных ШОС марок Intoflux GB 1040/H и Intoflux GB 1220/A. По результатам ДТА температура размягчения ШОС марки Intoflux GB 1040/H составляет 755 С, размягчение ШОС марки Intoflux GB 1220/A происходит в интервале температур 645-803 С. Температуры начала плавления кристаллических фаз исследуемых смесей составляют 825 и 925 С для ШОС марки Intoflux GB 1040/H, 1097 и 1206 С для ШОС марки Intoflux GB 1220/A. По результатам опытно-промышленных испытаний ШОС марки Intoflux GB 1040/H рекомендована к применению при разливке средне-и высокоуглеродистых сталей в качестве заменителя импортной ШОС марки Steelin ML/HC-230. Ключевые слова: непрерывная разливка стали, шлакообразующие смеси, температура размягчения и плавления, дифференциальный термический анализ. Ссылка для цитирования: Зинченко С.А., Смагина Е.А., Мымрин В.А., Камаева Л.В. Определение температуры плавления шлакообразующих смесей для кристаллизатора сортовой МНЛЗ методом дифференциального термического анализа // Черная металлургия. Бюллетень научно-технической и экономической информации.

Vestnik MGSU, 2018

Introduction: in the article the estimation of new ecological safety biopositive polymer-mineral ... more Introduction: in the article the estimation of new ecological safety biopositive polymer-mineral composite (BPMC) building materials obtained with the use of technogenic wastes is considered. This approach is one of the ways to solve the problem of improving the environmental safety of the environment. Materials and methods: BMPC environmental safety studies were performed using microstructural, X-ray and elemental analysis methods, studying physical and mechanical properties and fire safety. Man-caused wastes inventory and classificational ecological assessment by the lif e cycle was carried out. Results: the conformity of the Baikal region man-caused wastes (such as fly ash from heat-power engineering, aluminosilicate microspheres, isolated from bottom ash wastes, marble dust (microcalcite), industrial waste of polyvinylchloride (PVC), as well as small-sized mica waste in the form of vermiculite) to the basic characteristics that allow to use this wastes in the production of BMPC-products by extrusion as fillers. The man-caused wastes ecological utilization mechanism was developed. Composition of composite materials, in which industrial PVC waste is used as the matrix, and fly ash, ash microspheres, marble dust and vermiculite as fillers, were developed. The proposed technology for the production of BPMC products allows the use of technogenic wastes in a wide range in the composition from 20 to 60 %. The new biopozitive polymer-mineral composite products properties were studied. Conclusions: the conducted studies of the composition and properties of samples obtained using different types of manmade waste in the polymer-mineral composites production proved that the production of BPMC products ensures the building materials and environmental safety through the reliable and durable materials production that comply with regulatory requirements. According to the life cycle environmental safety assessment, the waste products obtained on the basis of waste have significant advantages in terms of a technical and environmental characteristics set.

Methanol synthesis catalyst (MSC) waste was applied as the principal component (till 70 wt.%) of ... more Methanol synthesis catalyst (MSC) waste was applied as the principal component (till 70 wt.%) of sustainable ceramics in composites with bauxite processing waste (RM), and waste foundry sand (FS). The results of the initial components' chemical interaction studies by a complex of methods (XRD, SEM/EDS/mapping, AAS and LAMMA) during heating demonstrated the synthesis of amorphous glasslike new formation, their filling of pores and compaction of the ceramic's structure. In this case, a strong chemical and mechanical binding of all heavy metals and other hazardous elements of the initial industrial waste occurs with their transfer to an

The International Journal of Advanced Manufacturing Technology, Aug 18, 2022

The rapid deterioration of the environmental situation comes mainly from environmental pollution ... more The rapid deterioration of the environmental situation comes mainly from environmental pollution by industrial and municipal wastes in the form of industrial and land lled industrial and municipal wastes. The only way out of this threatening situation is the urgent utilization of all these wastes as valuable raw materials alternative to traditional natural materials. This article describes in detail the result of the complete replacement of natural materials with four industrial wastes-from iron ore processing, cellulose and pulp production, concrete production and demolition, and lime production-without changing the technological process nor creating new residues. The samples' axial resistance values reached up to 4.94 MPa after 3 curing days, 5.75 MPa after 7 days, and 11.47 MPa on the 720th day of outdoor curing. The XRD, SEM, EDS, and LAMMA methods demonstrated the sol-gel solutions' chemical interaction process and their gradual densi cation to a stone-like state. The developed materials have high mechanical and environmental properties and can be used to produce construction materials, such as bases of road and air eld runways, levee cores, industrial and municipal dumps, building foundations, bricks, and blocks.

The International Journal of Advanced Manufacturing Technology, Mar 31, 2022

Research and reviews: journal of material sciences, Nov 20, 2018

Tunnelling and Underground Space Technology, 2007

The International Journal of Advanced Manufacturing Technology, Jan 7, 2022

The International Journal of Advanced Manufacturing Technology, Oct 12, 2020

The primary purpose of this study was to experimentally validate the possibility of using hazardo... more The primary purpose of this study was to experimentally validate the possibility of using hazardous red mud (RM) from bauxite ore treatment and clay slate mining wastes (SW)-scraps of slabs and polishing sludge-as the main raw components in composites with poorly burned limestone as lime production wastes (LPW) here used as a binding additive. Mixtures of these components were homogenized, hydrated, and compacted with a compressive strength of 10 MPa. The incorporation of 15-30% LPW led to axial strength values of 4.7-12.8 MPa on the 28th curing day and 10.6-23.7 MPa on the 365th day. The results of XRF, XRD, AAS, and SEM with EDS, DTA-TGA, and LAMMA analyses showed that all mechanical properties of the developed materials were enhanced due to the synthesis of new formations, mainly amorphous and partly crystalline, during the microstructural densification of the composites. The developed materials can be used as road base and airfield runways, levee cores, industrial and municipal waste dumps, building foundations, and production of tiles, bricks, and blocks. The most important contribution of this study is the convincing experimental evidence of an efficient engineering solution to the ecological problems of three types of industrial enterprise, without the use of expensive traditional market materials such as Portland cement or commercial lime, preventing the accumulation of large amounts of these wastes in industrial dumps. Furthermore, it would significantly reduce nature's irreversible destruction by quarries of natural raw material like clay, sand, and crushed stone.

Journal of Coastal Research, Sep 5, 2019

ABSTRACT Zhu, W.; Zhang, M.; Yu, G.; Petukhov, V.; Mymrin, V., and Gidarakos, E., 2020. Flow resi... more ABSTRACT Zhu, W.; Zhang, M.; Yu, G.; Petukhov, V.; Mymrin, V., and Gidarakos, E., 2020. Flow resistance in dredged soil under a vacuum preloading system with vertical drainage boards. Journal of Coastal Research, 36(2), 327–338. Coconut Creek (Florida), ISSN 0749-0208. Vacuum preloading combined with prefabricated vertical drains is one of the most widely applied methods to improve soft-ground loading capacity in coastal engineering projects. The resistance of solid particles to the pore-water flow in vacuum-preloaded soil plays an important role in the soil consolidation and pore-water dissipation. However, the flow resistance is still not clearly known during the vacuum drainage process. It is not clear whether the formulae for calculating the flow resistance factor for flow in uniform non-deformational porous media are applicable for flow in vacuum-preloaded soils or not. Because of a lack of knowledge on flow resistance in the vacuum-preloaded soil, coastal engineers only rely on their experience to select vacuum pumps. In this paper, the hydraulic resistance to flow in vacuum-preloaded soils was investigated. Energy conservation in the vacuum preloading system during the drainage process was analyzed. Sixteen laboratory tests were conducted, in which the vacuum pressure, flow rate, seepage velocity, and particle Reynolds number were observed or calculated. Results showed that particle size, uniformity coefficient, and porosity of the soil have important effects on resistance in dredged soils under vacuum preloading condition. The flow resistance in the vacuum-preloaded soil behaved quite differently from that in uniform porous medium. The formulae for calculating the flow resistance factor for flow in uniform packed beds were not applicable for flow in vacuum-preloaded soils. A new formula was proposed to calculate the flow resistance factor in vacuum-preloaded soils with acceptable accuracy. Because the vacuum preloading system with fixed pump power consumes much energy, new vacuum preloading systems with low energy consumption are necessarily developed in future work.

Applied Thermal Engineering, Apr 1, 2015

Abstract In order to solve environment problems of ceramics industry new compositions of material... more Abstract In order to solve environment problems of ceramics industry new compositions of materials were developed from three types of porcelain production tails – fired wastes (FW), unfired wastes (UW) and wastewater treatment plant sludge (WTPS) – as the main raw materials of new compositions of cementless building materials. The binder material used here was lime production waste (LPW), i.e., incompletely burned lime. The uniaxial compressive strength of the new materials containing 15 wt% of LPW at one year of age increased up to 14.2 MPa and the materials with 5% LPW content increased up to 8.6 MPa, exceeding the specifications of Brazilian standards for hollow concrete blocks. The water absorption (WA) coefficient of different compositions at the age of 28 days ranged from 17.9 to 24.6%, but this does not affect the values of the water resistance coefficient (0.71–0.85). X-ray diffraction and scanning electron microscopy analyses indicated that the strength of the new materials increases due to the synthesis of amorphous and crystalline compounds. The feasibility of the new materials based on the use of four types of industrial wastes for the production of new building materials with high mechanical properties, which meet the requirements of national standards.

Clean Technologies and Environmental Policy, Mar 26, 2016

The main purpose of this study is to develop composites and laboratory technology for the product... more The main purpose of this study is to develop composites and laboratory technology for the production of construction materials with the highest percentage of Kraft pulp production wastes-dregs, grits, and lime mud, with the lime production waste as a binding component. The concentration of these wastes, used as raw materials, varied in the following limits: dregs 0-45 %, grits 0-45 %, lime mud 0-30 %, and lime waste production 10-25 %. The values of uniaxial compressive strength of the developed construction materials on the 3rd day of curing reached 5.89 MPa, on the 7th day-7.95 MPa, on the 14th day-9.35 MPa, on the 60th day-18.52 MPa, and on the 180th day, 19.34 MPa. Through XRF, XRD, SEM, EDS, and LAMMA methods, it was determined that these values of mechanical properties can be explained by dissolving the solid particles surfaces of the components in an alkaline environment, and by synthesizing new formations, specially amorphous and partly crystalline carbonates. The results of the study indicate that the waste of Kraft pulp production can be used as valuable components in the production of the construction materials without the application of traditional natural materials.

Construction and Building Materials, Apr 1, 2019

Journal of Water Process Engineering

The International Journal of Advanced Manufacturing Technology, 2022

Ceramics International, 2021

The International Journal of Advanced Manufacturing Technology, 2020

The aim of this study was the experimental tests of the mechanical properties and structure forma... more The aim of this study was the experimental tests of the mechanical properties and structure formation processes of sustainable ceramics from hazardous lead ore flotation waste, spent foundry sand, and natural red clay to produce sustainable ceramics. The lead was mined on a large scale from lead ores in the city of Adrianópolis, Brazil, for 58 years. The wastes from this activity bequeathed profound environmental and social impacts. The mechanical characteristics of twenty compositions of the ceramics were analyzed through the flexural resistance, water absorption, apparent density, and linear shrinkage; the study of the physicochemical processes of the ceramics' mineral composite transitions and structure formation during sintering at 900-1250°C was accomplished using XRD, SEM, EDS, AAS, and LAMMA methods. All ceramics presented flexural resistance (until 10.08 MPa) in comparison with the values established in the Brazilian national standards (> 1.5 MPa), with low water absorption and shrinkage. Ceramics with 7% of the flotation waste and 10% spent foundry sand, whose resistance reached from 3.7 to 10.1 MPa, showed the best mechanical properties. Leaching and solubility analyses by AAS method showed that there is no environmental jeopardy in using these compositions to produce sustainable ceramics.

Matéria (Rio de Janeiro), Oct 2, 2017

O objetivo deste trabalho é analisar o efeito do reuso da água e dos resíduos de lavagem dos cami... more O objetivo deste trabalho é analisar o efeito do reuso da água e dos resíduos de lavagem dos caminhões betoneiras na resistência à compressão de concretos. O método para analisar a influência destes materiais na resistência à compressão foi comparar uma amostra-controle (traço padrão de 30 MPa) com amostras de diferentes composições. O resultado de cada amostra foi diferente em função de sua composição, no entanto, pode-se afirmar que a água e o resíduo de lavagem não afetaram de forma significativa a resistência à compressão, pois, todas as amostras com 100% de cimento deram resultados superiores a 90% da amostracontrole. Percebe-se que a maior proporção das partículas do resíduo de lavagem está entre 1 e 10 µm, ou seja, as partículas são finas e semelhantes às do cimento. Nota-se, por meio do método de fluorescência de raio x, que nenhum elemento químico diferente foi encontrado no resíduo de concreto, todos aparecem no cimento. Observa-se, também, que não houve síntese de novos minerais, somente pequenas quantidades (menor do que os limites de detecção do método de difração de raio x) de aluminossilicatos e quartzo dissolvidos, que foram sintetizados em novos minerais cristalinos, podendo ser atribuídos como substâncias amorfas em estado sol-gel.