Solid-phase concentration of calcium ions with mineral sorbents                                  in creation of anti-icing materials

The results of an experimental study of calcium ion adsorption processes carried out on various mineral sorbents of natural origin are presented. The sorption properties of the selected objects were studied and the possibility of their use as combined anti-icing materials was evaluated. In the work were investigated technological indicators of the quality of sorbents - the pH of the zero-charge point, the sorption capacity of sorbents and the optimum pH interval to determine the sorption activity of mineral raw materials on calcium ion. Analysis of the adsorption isotherms of calcium ions by the mineral sorbents studied makes it possible to note that the adsorption equilibrium on the clay is established more rapidly than on the opal of the marl type and marl. At the same time, the maximum absorption capacity of clay and marl has close values, which is related to the structure of the sorbent surface and the mineral composition of the materials. Opal of the marl type has a more developed surface, which is illustrated by a much higher absorption capacity and is confirmed by the values of the specific surface area. The obtained experimental data were processed using Freundlich, Langmuir, Temkin, and Dubinin-Radushkevich models. When describing the adsorption equilibrium of calcium ions on mineral sorbents, the Freyndlich isotherm is a more rigorous model, which indicates the presence of a large number of active centers and their exponential distribution on the surface of sorbents. The quantitative characteristics of the adsorption capacity of sorbents, found by adsorption models, made it possible to identify the optimum conditions of processes, establish a relationship between the values of the sorption of calcium ions by their structure and the porosity of the materials. It has been established that opal of marl type is the most effective carrier for producing anti-icing materials. For citation: Dzhigola L.A., Syutova E.A. Solid-phase concentration of calcium ions with mineral sorbents in creation of anti-icing materials. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 9-10. P. 98-104

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Maximum Solid Phase Concentration in Geophysical Turbulent Gas‐Particle Flows: Insights From Laboratory Experiments

Geophysical Research Letters ◽

10.1029/2019gl082658 ◽

2019 ◽

Vol 46 (12) ◽

pp. 6388-6396 ◽

Cited By ~ 5

Author(s):

A. Weit ◽

O. Roche ◽

T. Dubois ◽

M. Manga

Keyword(s):

Laboratory Experiments ◽

Solid Phase ◽

Phase Concentration ◽

Particle Flows ◽

Solid Phase Concentration

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Doping and Alloying of Hydrogenated Amorphous Germanium Films Prepared by DC-Magnetron Sputtering

MRS Proceedings ◽

10.1557/proc-297-717 ◽

1993 ◽

Vol 297 ◽

Cited By ~ 5

Author(s):

T. DrÜsedau ◽

A. Annen ◽

B. SchrÖder

Keyword(s):

Solid Phase ◽

Dark Conductivity ◽

Concentration Addition ◽

Phase Concentration ◽

N Doping ◽

Solid Phase Concentration ◽

Donor States ◽

B Doping ◽

Si Content ◽

High Level

In this paper we present a detailed study of doping and alloying effects in a-Ge:H due to the incorporation of phosphorus, nitrogen, oxygen, boron, carbon and silicon. The film characterization was performed by means of quantitative analysis , optical absorption in the band and subband range and conductivity measurements. N and O were found to form donor states resulting in an increase of the dark conductivity up to five orders of magnitude. The maximum value of 0.3 (Ωcm)-1 has been obtained by N-doping of about 1 at% solid phase concentration, which exceeds the effect of P doping. B doping causes a decrease of the dark conductivity to a minimum of 10-6 (Ωcm)-1 at 150 ppm solid phase concentration. Addition of Si and C up to concentrations of about 5 at % does not influence the subgap absorption, where best values of E0<50 meV and α(0.6 eV)<10 cm-1 were obtained for the Urbach energy and midgap absorption, respectively. A Si content of 1 at % decreases the dark conductivity, whereas the normalized photoconductivity remains at a high level of ŋμτ=10-5 cm2V-1.

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Wash-out of solid phase from the mechanically stirred charge

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19802152 ◽

1980 ◽

Vol 45 (8) ◽

pp. 2152-2163 ◽

Cited By ~ 3

Author(s):

Václav Machoň ◽

Vladimír Kudrna ◽

Vlasta Hudcová

Keyword(s):

Time Dependence ◽

Fresh Water ◽

Theoretical Approach ◽

Solid Phase ◽

Material Balance ◽

Sufficient Accuracy ◽

Experimental Measurements ◽

Simple Material ◽

Phase Concentration ◽

Solid Phase Concentration

Experimental measurements were performed of the time dependence of solid phase concentration in suspension at the outlet from the apparatus with the mechanically stirred charge. Suspension was being withdrawn continuously with fresh water supplied into the charge. Validity of the theoretical approach proposed earlier has been verified by the performed experiments. It has been demonstrated that the studied effect can be under certain conditions described with sufficient accuracy by a simple material balance of the solid phase in the system.

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Distribution of solid particles in a mixed vessel

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19902169 ◽

1990 ◽

Vol 55 (9) ◽

pp. 2169-2181 ◽

Cited By ~ 10

Author(s):

Petr Bílek ◽

František Rieger

Keyword(s):

Solid Phase ◽

Solid Particles ◽

Concentration Measurement ◽

Concentration Profiles ◽

Conductivity Method ◽

Phase Concentration ◽

Solid Phase Concentration ◽

Vessel Bottom ◽

Vessel Axis

The aim of our research was to study the axial, radial and tangential solid phase concentration profiles in a mixed vessel. The conductivity method was used for the concentration measurement. We accomplished the measurement in eleven points in five heights above the vessel bottom. The points were situated on three vertical planes passing through the vessel axis and on five values of radii. It was determined by means of statistic test of variance if it was possible to measure the concentration only in one point in each distance from the vessel bottom and neglect the radial and tangential concentration differences.

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