PREPARATION OF LIQUID-GLASS SILICATE-SODIUM ALKALINE SOLUTIONS FROM SILICON-CONTAINING ADDITIVES

Вестник ГГНТУ. Технические науки ◽

10.34708/gstou.2019.15.1.005 ◽

2019 ◽

Author(s):

С.-А. Муртазаев ◽

М.Ш. Саламанова

Keyword(s):

Alkaline Solution ◽

Atmospheric Pressure ◽

Liquid Glass ◽

Active Component ◽

Energy Dispersive ◽

Alkaline Solutions ◽

Alkaline Metals ◽

Highly Dispersed ◽

Energy Dispersive Microanalysis ◽

Insoluble Compounds

В основу получения бетонных композитов на вяжущих щелочной активации положен отечественный и зарубежный опыт применения шлакощелочных композитов в строительстве. В данной работе проведен энергодисперсионный микроанализ исследуемых бесклинкерных композиций на основе щелочных силикат натриевых растворов из кремнеземсодержащих горных пород. Разработанные рецептуры бесклинкерных вяжущих на основе высокодисперсных порошков различной природы, затворенных щелочным раствором, приготовленным мокрым способом при температурах до 950С и атмосферном давлении. Данная технология позволит расширить область применения щелочных цементов и получать бетоны с заданными свойствами. Работа выполнена в рамках исследований по реализации научного проекта 1848200001 Высококачественные бетоны с повышенными эксплуатационными свойствами на основе местного природного и техногенного сырья , получившего поддержку Российского фонда фундаментальных исследований (РФФИ). Alkaline mixing cements in which the alkaline metals will be the active component can interact with aluminosilicate minerals during hydration to form strong and insoluble compounds. The basis for the production of concrete composites on alkaline binding binders is based on domestic and foreign experience in the use of slag base composites in construction. In this work, an energy dispersive microanalysis of the clinkerfree compositions under study based on alkaline silicate sodium solutions from silicacontaining rocks was carried out. Developed formulations of clinkerless binders on the basis of highly dispersed powders of various nature, closed with an alkaline solution prepared by the wet method at temperatures up to 95 C and atmospheric pressure. This technology will allow you to expand the scope of alkaline cements and get concretes with desired properties.

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OBTAINING CLINKERLESS CEMENTS THROUGH THE SYNTHESIS OF BASIC SOLUTIONS OF SODIUM SILICATE FROM SILICA-CONTAINING ROCKS

Herald of Dagestan State Technical University Technical Sciences ◽

10.21822/2073-6185-2019-46-3-149-158 ◽

2019 ◽

Vol 46 (3) ◽

pp. 149-158

Author(s):

M. Sh. Salamanova ◽

S.-A. Yu. Murtazaev ◽

Z. H. Ismailova ◽

R. G. Bisultanov

Keyword(s):

Atmospheric Pressure ◽

Active Role ◽

Important Research ◽

Alkaline Metals ◽

Technical Parameters ◽

High Dispersal ◽

Research Task ◽

Basic Solutions ◽

High Temperature Processing ◽

Insoluble Compounds

Objectives The creation of clinkerless cements that do not require high-temperature processing and significant natural resources, at the same time as exhibiting good technical parameters, seems to be an important research task. Cements of alkaline instillation, in which alkaline metals play an active role, are capable of interacting with minerals of aluminosilicate nature forming strong and insoluble compounds.Methods Concrete composites from binding substances activated by alkaline were developed on the basis of Russian and foreign experience of using cinder slag composites in construction.Results In this work, energy-dispersion microanalysis of the developed clinkerless compositions based on alkaline silicate sodium solutions from silica-containing rocks was carried out.Conclusion Formulations of clinkerless cements based on high-dispersal powders of different natures mixed by the alkaline solution obtained using the wet technique at temperatures of up to 95 °C and atmospheric pressure are proposed. This technology will expand the use of alkaline cements, thus leading to the development of concrete having desired properties.

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Chemical deposition of hard composite coatings Ni–Cu–P–Cr2O3

10.36652/1813-1336-2020-16-4-179-181 ◽

2020 ◽

pp. 179-181

Author(s):

A.A. Abrashov A.A. ◽

E.G. Vinokurov ◽

M.A. Egupova ◽

V.D. Skopintsev

Keyword(s):

Chromium Oxide ◽

Alkaline Solution ◽

Composite Coatings ◽

Chemical Deposition ◽

Alkaline Solutions ◽

Functional Surface ◽

Heat Treated ◽

Weakly Acid Solution ◽

Coating Composition ◽

Weakly Acidic Solution

The technological (deposition rate, coating composition) and functional (surface roughness, microhardness) characteristics of chemical composite coatings Ni—Cu—P—Cr2O3 obtained from weakly acidic and slightly alkaline solutions are compared. It is shown that coatings deposited from slightly alkaline solution contain slightly less phosphorus and chromium oxide than coatings deposited from weakly acid solution (2...3 % wt. phosphorus and up to 3.4 % wt. chromium oxide), formed at higher rate (24...25 microns per 1 hour of deposition at temperature of 80 °C), are characte rized by lower roughness and increased microhardness. The Vickers microhardness at 0.05 N load of composite coatings obtained from slightly alkaline solution and heat-treated at 400 °C for 1 hour is 13.5...15.2 GPa, which is higher than values for coatings deposited made of weakly acidic solution. The maximum microhardness of coatings is achieved at concentration 20 g/l of Cr2O3 particles. The technology of chemical deposition of Ni—Cu—P—Cr2O3 coatings formed in slightly alkaline solution is promising for obtaining of materials with increased hardness and wear resistance.

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Analogues of the active and inactive sodium carbonate

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19823348 ◽

1982 ◽

Vol 47 (12) ◽

pp. 3348-3361 ◽

Cited By ~ 4

Author(s):

Erich Lippert ◽

Karel Mocek ◽

Emerich Erdös

Keyword(s):

Thermal Decomposition ◽

Time Dependence ◽

Water Vapour ◽

Sulphur Dioxide ◽

Atmospheric Pressure ◽

Flow Reactor ◽

Kinetic Measurements ◽

Sodium Potassium ◽

Alkaline Metals ◽

Hydrogen Carbonates

The reactivity of the anhydrous carbonates of alkaline metals with sulphur dioxide has been studied experimentally in dependence both on the nature of the cation and on the way of preparation of the anhydrous carbonate. The carbonates were prepared either by thermal decomposition of hydrogen carbonates or by thermal dehydration of carbonate hydrates. The carbonates of lithium, sodium, potassium, rubidium and caesium have been investigated. Kinetic measurements were carried out in a flow reactor in the integral regime at 423 K under atmospheric pressure, with a gas containing 0.2 vol.% of sulphur dioxide and 2.0 vol.% of water vapour in the nitrogen as a carrier gas. The reactivities have been compared on the basis of time dependence of the conversion of carbonate to sulphite.

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Weathering Phenomena on Naturally Weathered Potash-Lime-Silica-Glass with Medieval Composition Studied by Secondary Electron Microscopy and Energy Dispersive Microanalysis

Microchimica Acta ◽

10.1007/s006040070001 ◽

2000 ◽

Vol 135 (3-4) ◽

pp. 121-130 ◽

Cited By ~ 27

Author(s):

Gebhard Woisetschl�ger ◽

Myriam Dutz ◽

Sabine Paul ◽

Manfred Schreiner

Keyword(s):

Electron Microscopy ◽

Silica Glass ◽

Secondary Electron ◽

Energy Dispersive ◽

Energy Dispersive Microanalysis

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A novel experimental approach for studying spontaneous imbibition processes with alkaline solutions

E3S Web of Conferences ◽

10.1051/e3sconf/20198904004 ◽

2019 ◽

Vol 89 ◽

pp. 04004

Author(s):

T. Chevalier ◽

J. Labaume ◽

A. Delbos ◽

T. Clemens ◽

V. M. Waeger ◽

...

Keyword(s):

Interfacial Tension ◽

Alkaline Solution ◽

Recovery Process ◽

Oil Field ◽

Spontaneous Imbibition ◽

Alkaline Solutions ◽

Vienna Basin ◽

Natural Surfactants ◽

Current Flows ◽

Kinetics Of

Spontaneous imbibition processes can play an important role in oil production. It can be enhanced or influenced by wettability changes generated by properly designed chemicals or by the natural surfactants resulting from reactive crude oils in the presence of alkaline solutions. The reaction of basic salts with some components of oil can, indeed, lead to the formation of natural soaps that reduces the interfacial tension between oil and brine. The latter scenario is studied herein on samples and oil from the St Ulrich oil field in the Vienna basin. To that end, spontaneous imbibition experiments were performed with two brines differing by the absence or presence of alkali. We first present a general novel technique to monitor saturation changes on small rock samples for the purpose of assessing the efficiency of a given recovery process. Samples of only 15 mm in diameter and 20 mm in length and set at irreducible saturation were fully immersed in the solution of interest, and the evolution of the samples’ saturation with time was monitored thanks to a dedicated NMR technique involving the quantification of the sole oil phase present within the sample. A fully-3D imbibition configuration was adopted, involving counter-current flows through all faces of the sample. The experimental method is fast for two reasons: (i) the kinetics of capillary imbibition process is proportional to the square of sample size, i.e. very rapid if accurate measurements can be acquired on tiny samples, (ii) the present 3D situation also involves faster kinetics than the 1D configuration often used. The NMR technique was crucial to achieve such conditions that cannot be satisfied with conventional volumetric methods. The kinetics of oil desaturation during spontaneous imbibition is interpreted with the help of an analytical 3D diffusion model. For the alkaline solution, the diffusion coefficient is reduced by a factor of only two compared to the non-alkaline brine, although the interfacial tension between the oil and the imbibing solution is reduced by a factor of 10. Hence, a wettability change to a more water wet state has to be assumed when the alkaline solution replaces the non-alkaline solution in the imbibition process. However, no significant impact on the final saturation was observed.

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Highly dispersed Ru/Co catalyst with enhanced activity for catalyzing NaBH4 hydrolysis in alkaline solutions

Chinese Chemical Letters ◽

10.1016/j.cclet.2020.03.072 ◽

2020 ◽

Vol 31 (9) ◽

pp. 2512-2515

Author(s):

Jiapeng Zhang ◽

Fanzhen Lin ◽

Lijing Yang ◽

Hua Dong

Keyword(s):

Alkaline Solutions ◽

Co Catalyst ◽

Enhanced Activity ◽

Highly Dispersed

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Effect of surfactants on capacitance properties of carbon electrodes

MRS Proceedings ◽

10.1557/opl.2011.1477 ◽

2011 ◽

Vol 1333 ◽

Cited By ~ 1

Author(s):

Krzysztof Fic ◽

Grzegorz Lota ◽

Elzbieta Frackowiak

Keyword(s):

Surface Tension ◽

Alkaline Solution ◽

Surfactant Concentration ◽

Alkaline Solutions ◽

Carbon Electrodes ◽

Current Load ◽

Target Concentration ◽

Electrolyte Additives ◽

Different Types ◽

Triton X

ABSTRACTEffect of surfactants present in alkaline solutions on the capacitance of carbon electrodes has been studied. Different types of surfactants have been selected for this target. Concentration of these electrolyte additives was 0.005 mol L-1. Decreasing the surface tension in the electrode/electrolyte interface allows better penetration of electrolyte into the pores. Detailed analysis of capacitance versus current load, frequency dependence as well as self-discharge, cyclability and behaviour in wider voltage window proved a useful effect of Triton X-100 on capacitor operating in alkaline solution. Influence of surfactant concentration has also been investigated.

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CO2 Capture by Alkaline Carbonation as an Alternative to a Circular Economy

Applied Sciences ◽

10.3390/app10030863 ◽

2020 ◽

Vol 10 (3) ◽

pp. 863

Author(s):

Dalia Santa Cruz-Navarro ◽

Violeta Mugica-Álvarez ◽

Mirella Gutiérrez-Arzaluz ◽

Miguel Torres-Rodríguez

Keyword(s):

Co2 Capture ◽

Atmospheric Pressure ◽

Batch Reactor ◽

Morphological Characterization ◽

Raw Material ◽

Alkaline Solutions ◽

Reaction Conditions ◽

Industrial Enterprises ◽

Metal Carbonates ◽

Industrial Use

In order to combat global warming and climate change in a sustainable way, it is necessary to capture the anthropogenic CO2 emitted by different industrial sources and use it as a raw material to obtain a matrix of products for industrial use, such as metal carbonates. Therefore, this work presents the results of CO2 capture and conversion into carbonates using Sr and Ba alkaline solutions in a semi-continuous batch reactor. The results indicate that the effects of morphological characterization, purity of solids, and reaction time at ambient temperature and atmospheric pressure conditions is an inexpensive alternative process that is easily implemented in small industrial enterprises. The results yielded a 40% conversion of CO2 at the best reaction conditions with an aqueous solution of Sr(OH)2.

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