Groundmass Chromospinellides from Kimberlites of Khompu-May Kimberlite Field

Abstract The current paper presents the results of studying chromites of kimberlite mesostasis forming the Manchary, Aprelskaya, Erel, Turakhskaya, and Artemova pipes within the Khompu-May kimberlite field (central Yakutia). Despite shared texture and structural characteristics and mineral composition of the kimberlites, chromospinellide composition is distinctive in each pipe. Groundmass chromium spinel of the Aprelskaya and Erel kimberlite pipes is characterized by the highest aluminum oxide content (>10 wt. %). Chromites from the Erel and Turakhskaya pipes as well as a fraction of grains from the Manchary pipe with titanium oxide (<4 wt. %) form a field of common composition by Cr2O3 and TiO2 content. The Aprelskaya and Artemova pipes show up to 17 wt. % TiO2 in chromites. Such a difference in titanium content correlates with perovskite content in kimberlite groundmass of the Khompu-May field. The results of the study revealed two trends in evolution of chromospinellide microcrystals (R. Mitchell, 1986) – ulvöspinel associated with typical kimberlites and titanomagnetite characteristic of micaceous kimberlites. Chromospinellides of the Aprelskaya pipe demonstrate the ulvöspinel trend only, suggesting earlier spinel crystallization relative to groundmass mica. Spinellides from the Erel and Artemova pipes follow the titanomagnetite trend only, being crystallized after formation of mesostasis mica. Spinellides from the Manchary and Turakhskaya pipes meet the ulvöspinel and titanomagnetite trend, indicating two stages of mineral crystallization relative to phlogopite.

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INFLUENCE OF TITANIUM OXIDE AND MANGANESE OXIDE ON THE MINERAL COMPOSITION AND THE PROPERTIES OF CEMENT

Cement Science and Concrete Technology ◽

10.14250/cement.67.31 ◽

2013 ◽

Vol 67 (1) ◽

pp. 31-37

Author(s):

Takashi CHABAYASHI ◽

Akinori NAKAMURA ◽

Hiroyoshi KATO ◽

Kaori SADA

Keyword(s):

Manganese Oxide ◽

Titanium Oxide ◽

Mineral Composition

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Mineral composition and formation conditions of the Inkur tungsten deposit ores (Dzhidinsky ore field, South-Western Transbaikalia)

Earth sciences and subsoil use ◽

10.21285/2686-9993-2020-43-3-290-306 ◽

2020 ◽

Vol 43 (3) ◽

pp. 290-306

Author(s):

L. B. Damdinova ◽

B. B. Damdinov

Keyword(s):

Mineral Composition ◽

Tungsten Deposit ◽

Homogeneous Solutions ◽

Western Transbaikalia ◽

Low Salinity ◽

Mineral Associations ◽

Formation Conditions ◽

The Individual ◽

Two Stages ◽

Petrographic Description

The aim of the study is to clarify the mineral composition and determine the conditions of the formation of the quartz-hubnerite veins of the Inkur stockwork tungsten deposit (the Dzhidinsky ore field, South-Western Transbaikalia). The research methods include a mineralogical and petrographic description of the ore quartz-hubnerite veins; an electron microprobe analysis of the mineral associations; thermometry, cryometry, and Raman spectroscopy of the individual fluid inclusions in quartz, fluorite, hubnerite, and muscovite. The mineralogical and petrographic studies has made it possible to clarify the mineral composition of the Inkur deposit ores and determine the mineral paragenesis formation sequence. The fluid inclusion studies have established that the ore deposition was occurring in the relatively low-salinity (~5.7–14.6 wt. % eq. NaCl) homogeneous solutions due to a decrease of the temperature. The study of the salt composition of the solutions has identified Ca chloride as a prevailing component, with NaCl, KCl, and MgCl as admixtures. CO2 and N2 have been identified in the gas phase of inclusions. Two stages of mineral formation have been defined: high-temperature (≥300 °С) and low-temperature (≥2.00–300 °С). The conducted studies allow qualitative estimation of the chemical composition of the ore-forming solutions. It has been established that one of the main factors of the hubnerite deposition is a temperature factor.

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MODIFIED COBALT CATALYSTS FOR HYDROGENATION OF HYDROCARBONS

ГОРЕНИЕ И ПЛАЗМОХИМИЯ ◽

10.18321/cpc364 ◽

2020 ◽

Vol 18 (3) ◽

pp. 156-161

Author(s):

A.N. Aitugan ◽

S.K. Tanirbergenova ◽

Ye. Tileuberdi ◽

D. Tugelbayeva

Keyword(s):

Catalytic Activity ◽

Aluminum Oxide ◽

Process Parameters ◽

Cobalt Catalyst ◽

Cobalt Catalysts ◽

Oxide Content ◽

Acetylene Hydrogenation ◽

Aluminum Oxides ◽

Selective Hydrogenation Of Acetylene ◽

Chemical Contents

This work is devoted to the study of the influence of aluminum oxide content on the activity of cobalt catalysts in the reaction of selective hydrogenation of acetylene to ethylene. Cobalt catalysts modified with aluminum oxide having size between 50 to 500 nm were synthesized. Chemical contents and structure of carrier were investigated. The catalytic activity of 5 % Со /clay and 5% Co/SiAl catalysts at acetylene hydrogenation was studied in the temperature range 100-180 , with a ratio of 1:2 of acetylene and hydrogen. The ethylene yield is 87.8 % in modifying the cobalt catalyst with aluminum oxide, whereas with the same process parameters, the ethylene yield is 72 %. 5 % Cobalt catalysts modified with 1.5 % aluminum oxides are more active in hydrogenation acetylene process than 5 % Со /clay 450 ℃ catalyst.

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Nanofluids, Synthesis and Stability - Brief Review

ESPOCH Congresses: The Ecuadorian Journal of S.T.E.A.M. ◽

10.18502/espoch.v1i2.9520 ◽

2021 ◽

Author(s):

Jorge Silva-Yumi ◽

Telmo Moreno Romero ◽

Gabriela Chango Lescano

Keyword(s):

Carbon Nanotubes ◽

Thermal Properties ◽

Ethylene Glycol ◽

Aluminum Oxide ◽

Titanium Oxide ◽

Silicon Oxide ◽

Physical Treatment ◽

Natural Nanoparticles ◽

Palabras Clave ◽

Hybrid Nanofluids

Nanofluids constitute an alternative for the most efficient use of energy as they allow generating or improving thermal properties among others of traditional fluids, they are defined as so-called base fluids, such as: water, ethylene glycol, oils, etc., which contain nanoparticles in suspension , such as: aluminum oxide, silicon oxide, titanium oxide, metal nanoparticles, carbon nanotubes, graphene, carbides, etc. Nanofluids can be synthesized by two methods, the nanoparticles can be obtained separately and then the nanofluid is prepared or both nanoparticles and the nanofluid can be prepared simultaneously, an important factor to consider in obtaining nanofluids is their stability. Stability can be achieved by physical treatment or chemical treatment using surfactants. There are many studies about nanofluids, however, most are obtained with synthetic nanoparticles, leaving the use of natural nanoparticles as a field to be explored, as well as other surfactants to improve their stability. Keywords: nanofluids, hybrid nanofluids, nanoparticles, nano refrigerant. Resumen Los nanofluidos constituyen una alternativa para el uso más eficiente de energía pues permiten generar o mejorar las propiedades térmicas entre otras de los fluidos tradicionales, son definidos como fluidos denominados base, como: agua, etilenglicol, aceites, etc., que contienen nanopartículas en suspensión, como: óxido de aluminio, óxido de silicio, óxido de titanio, nanopartículas metálicas, nanotubos de carbono, grafeno, carburos, etc. Los nanofluidos se pueden sintetizar por dos métodos, se pueden obtener las nanopartículas por separado y luego preparar el nanofluido o se puede preparar simultáneamente las nanopartículas y el nanofluido, un factor importante a considerar en la obtención de nanofluidos es su estabilidad. La estabilidad se puede lograr mediante tratamiento físico o tratamiento químico mediante la utilización de surfactantes. Existen muchos estudios acerca de nanofluidos sin embargo, la mayoría se obtienen con nanopartículas sintéticas, quedando el uso de nanopartículas naturales como un campo por explorar al igual que otros surfactantes para mejorar su estabilidad. Palabras Clave: nanofluidos, nonofluidos híbridos, nanoparticulas, nanorefrigerantes.

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Production of Intensifying Blue Light by Cherenkov Radiation Phenomena and Their Use as Power Source Applications

10.21203/rs.3.rs-344211/v1 ◽

2021 ◽

Author(s):

Shima El-Shemy ◽

Mostafa Eissa ◽

Aly Arafa

Keyword(s):

Photonic Crystal ◽

Photonic Crystals ◽

Aluminum Oxide ◽

Titanium Oxide ◽

Blue Light ◽

Cherenkov Radiation ◽

Power Source ◽

One Dimension ◽

Crystal Composite ◽

High Reflectance

Abstract It is interesting to note in recent years for a large number of researchers the topic of photonic crystals (PhCs) because of their new and useful properties. In addition, there are many advantages to photonic crystals materials as a high reflectance materials as well as the high transmittance materials based on the target application. The calculations were done for Aluminum oxide and titanium oxide (Al2O3/TiO2) composite photonic crystal in one dimension, which shows a high reflectivity (~ 99 %). The chosen photonic crystal composite can be useful to reflect the Cherenkov light many times which comes out from Cherenkov radiation by using radioisotope 90Sr-90Y. The output intensified light has power 1.45 µwatt and 1.45 nwatt for 90Sr-90Y with the activity 1Ci and 1mCi respectively, that can be used for micro/nano-power source applications.

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Performance of basaltic dust issued from an asphaltic plant as a flocculant additive for wastewater treatment

Water Science & Technology ◽

10.2166/wst.2004.0043 ◽

2004 ◽

Vol 49 (1) ◽

pp. 147-154

Author(s):

R.M. Ramírez Zamora ◽

A. Chávez Mejía ◽

R. Domínguez Mora ◽

A. Durán Moreno

Keyword(s):

Wastewater Treatment ◽

Municipal Wastewater ◽

Oxide Content ◽

Test Results ◽

Test Technique ◽

Jar Test ◽

Physicochemical Characterisation ◽

Wastewater Samples ◽

Two Stages ◽

Positive Effect

The feasibility of using basaltic dust as a flocculant additive or coagulant aid for wastewater treatment was assessed in this research. The experimental study was divided into two stages: 1) physicochemical characterisation of the basaltic dust by applying standardised techniques, and 2) evaluation of this material as flocculant additive for the coagulation-flocculation of wastewater treated for reuse. Coagulation-flocculation experiments were carried out in the laboratory with a mixture of industrial and municipal wastewater samples collected from two points of the final discharge of the Mexico City sewerage system. Aluminium sulphate and lime were used as coagulants and the basaltic dust as flocculant additive, by applying the jar-test technique. The results of the corrosivity, reactivity, explosiveness, toxicity, inflammability and biological risk tests indicated that this material is classified as a non-hazardous waste (according to the Mexican legislation, NOM-052-ECOL-1993). The density, oxide content and particle size values of basaltic dust were similar to those reported for the flocculant additive denominated activated silica. The jar test results showed a positive effect of basaltic dust over the effluent and sludge qualities, to the extent that coagulant doses can be reduced 30% (from 150 mg/L to 110 mg/L of Al2(SO4)3).

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Investigation of transport properties of porous coatings from nanoparticles of aluminum oxide

Journal of Physics Conference Series ◽

10.1088/1742-6596/2088/1/012022 ◽

2021 ◽

Vol 2088 (1) ◽

pp. 012022

Author(s):

N S Ivanov ◽

Yu A Kuzma-Kichta ◽

A V Lavrikov

Keyword(s):

Silicon Carbide ◽

Aluminum Oxide ◽

Transport Properties ◽

Titanium Oxide ◽

Optical Microscope ◽

Porous Coatings

Abstract In this work, coatings of nanoparticles of aluminum oxide are investigated. Photos were obtained using an electron and optical microscope. A method is proposed for the formation of a coating of nanoparticles with and without agglomerates. The transport properties of nanoparticles of aluminum oxide, silicon carbide, titanium oxide and diamond have been investigated. The effect of agglomerates of nanoparticles on the rise of liquid has been determined.

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