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Alkaline Component

The Experts below are selected from a list of 90 Experts worldwide ranked by ideXlab platform

G B Sadykhov – 1st expert on this subject based on the ideXlab platform

  • oxidation of titanium vanadium slags with the participation of na2o and its effect on the behavior of vanadium
    Russian Metallurgy, 2008
    Co-Authors: G B Sadykhov

    Abstract:

    The oxidation of titanium-vanadium slags with the participation of Na2O is studied by X-ray diffraction. The slags have the following phase compositions: anosovite, anosovite-spinellide, and spinellide. An Alkaline Component in the form of Na2CO3 is introduced into a slag either before oxidizing roasting or during slag production from a concentrate (Alkaline slag forms). The general laws of the processes of slag oxidation in the temperature range 600–1100°C and the effect of these processes on the behavior of vanadium are found. The degree of formation of watersoluble vanadium compounds during roasting is shown to depend substantially on the SiO2 content in the slag. When the slags are roasted, SiO2 intensely combines with Na2O to form sodium silicates or aluminosilicates depending on the slag composition, which restricts the formation of sodium vanadates. In anosovite-spinellide slags (with a high Al2O3 content), the maximum degree of vanadium oxidation with the formation of water-soluble sodium vanadates is achieved at a temperature of about 1000°C. In anosovite slags (with a low Al2O3 content), the maximum degree of formation of water-soluble vanadium compounds is achieved at a temperature below 900°C. At higher temperatures, the major portion of vanadium transforms into an acid-soluble form.

  • Oxidation of titanium-vanadium slags with the participation of Na_2O and its effect on the behavior of vanadium
    Russian Metallurgy (Metally), 2008
    Co-Authors: G B Sadykhov

    Abstract:

    The oxidation of titanium-vanadium slags with the participation of Na_2O is studied by X-ray diffraction. The slags have the following phase compositions: anosovite, anosovite-spinellide, and spinellide. An Alkaline Component in the form of Na_2CO_3 is introduced into a slag either before oxidizing roasting or during slag production from a concentrate (Alkaline slag forms). The general laws of the processes of slag oxidation in the temperature range 600–1100°C and the effect of these processes on the behavior of vanadium are found. The degree of formation of watersoluble vanadium compounds during roasting is shown to depend substantially on the SiO_2 content in the slag. When the slags are roasted, SiO_2 intensely combines with Na_2O to form sodium silicates or aluminosilicates depending on the slag composition, which restricts the formation of sodium vanadates. In anosovite-spinellide slags (with a high Al_2O_3 content), the maximum degree of vanadium oxidation with the formation of water-soluble sodium vanadates is achieved at a temperature of about 1000°C. In anosovite slags (with a low Al_2O_3 content), the maximum degree of formation of water-soluble vanadium compounds is achieved at a temperature below 900°C. At higher temperatures, the major portion of vanadium transforms into an acid-soluble form.

James K. Meen – 2nd expert on this subject based on the ideXlab platform

  • Thematic Article Evidence for magma mixing in the Mariana arc system
    , 1998
    Co-Authors: James K. Meen, Herman H. Bloomer

    Abstract:

    Volcanoes of the Mariana arc system produce magmas that belong to several liquid lines of descent and that originated from several different primary magmas. Despite differences in parental magmas, phenocryst assemblages are very similar throughout the arc. The different liquid lines of descent are attributed to differences in degree of silica saturation of the primary liquids and in the processes of magmatic evolution (fractional crystallization vs magma mixing). Pseudoternary projections of volcanic rocks from several arc volcanoes are used to show differences between dif- ferent magmatic suites. In most of the arc, parental liquids were Ol- and Hy-normative basalts that crystallized olivine, augite, and plagioclase (a iron-titanium oxide) and then plagioclase and two pyroxenes, apparently at low pressure. Eruptive rocks follow subparallel liquid lines of descent on element-element diagrams and on pseudoternary projections. Magmas at North Hiyoshi are Ne-normative and have a liquid line of de- scent along the thermal divide due to precipitation of olivine, augite, and plagioclase. Derived liquids are large ion lithophile element (LILE)-rich. Magmas at other Hiyoshi seamounts included an Alkaline Component but had more complex evolution. Those at Central Hiyoshi formed by a process dominated by mixing Alkaline and subAlkaline magmas, whereas those at other Hiyoshi seamounts evolved by combined magma mixing and fractional crystallization. Influence of the Alkaline Component wanes as one goes south from North Hiyoshi. Alkaline and subAlkaline magmas were also mixed to produce magmas erupted at the Kasuga seamounts that are behind the arc front. The Alkaline magmas at both Hiyoshi and Kasuga seamounts had different sources from those of the subAlkaline magmas at those sites as indicated by trace element ratios and by eNd.

  • Evidence for magma mixing in the Mariana arc system
    Island Arc, 1998
    Co-Authors: James K. Meen, Robert J. Stern, Sherman H. Bloomer

    Abstract:

    Volcanoes of the Mariana arc system produce magmas that belong to several liquid lines of descent and that originated from several different primary magmas. Despite differences in parental magmas, phenocryst assemblages are very similar throughout the arc. The different liquid lines of descent are attributed to differences in degree of silica saturation of the primary liquids and in the processes of magmatic evolution (fractional crystallization vs magma mixing). Pseudoternary projections of volcanic rocks from several arc volcanoes are used to show differences between different magmatic suites. In most of the arc, parental liquids were Ol- and Hy-normative basalts that crystallized olivine, augite, and plagioclase (± iron-titanium oxide) and then plagioclase and two pyroxenes, apparently at low pressure. Eruptive rocks follow subparallel liquid lines of descent on element–element diagrams and on pseudoternary projections. Magmas at North Hiyoshi are Ne-normative and have a liquid line of descent along the thermal divide due to precipitation of olivine, augite, and plagioclase. Derived liquids are large ion lithophile element (LILE)-rich. Magmas at other Hiyoshi seamounts included an Alkaline Component but had more complex evolution. Those at Central Hiyoshi formed by a process dominated by mixing Alkaline and subAlkaline magmas, whereas those at other Hiyoshi seamounts evolved by combined magma mixing and fractional crystallization. Influence of the Alkaline Component wanes as one goes south from North Hiyoshi. Alkaline and subAlkaline magmas were also mixed to produce magmas erupted at the Kasuga seamounts that are behind the arc front. The Alkaline magmas at both Hiyoshi and Kasuga seamounts had different sources from those of the subAlkaline magmas at those sites as indicated by trace element ratios and by Nd.

Bessonova Ga – 3rd expert on this subject based on the ideXlab platform

  • Are the results of intragastric pH-metry and measurements of the pH of extracted gastric juice comparable?
    Laboratornoe delo, 1990
    Co-Authors: Geller Li, Geller Al, Bessonova Ga

    Abstract:

    : Fundal pH and pH of withdrawn gastric juice were measured under basal condition (with no stimulants used) in normal subjects and patients with chronic moderately severe and marked fundal gastritis and duodenal ulcer (altogether 96 examinees). Aspiration pH-metry with a tube designed by Ye. Yu. Linar was employed. Comparison of the results revealed statistically significant differences (the ‘agreement criterion’) in the pH values obtained by the compared methods. Low pH values were more frequent in intragastric fundal pH-metry, possibly at the expense of the presence of not only acid but of the antral-Alkaline Component in the withdrawn gastric juice. These differences should be taken into consideration in the clinical laboratory diagnosis.