ВЗАЄМОДІЯ ДІОКСИДУ ТИТАНУ З ЕВТЕКТИЧНИМ РОЗПЛАВОМ NaCl – CaCl2
The results of studies of the interaction of titanium dioxide with the eutectic melt of (0.48) NaCl–(0.52) CaCl2 (mol.) in the temperature range of 823–1073 K are shown. It is established that the interaction of titanium dioxide with the melt of sodium chlorides and calcium is accompanied b...
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| Дата: | 2020 |
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| Автори: | , , , , |
| Формат: | Стаття |
| Мова: | English |
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V.I.Vernadsky Institute of General and Inorganic Chemistry
2020
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| Онлайн доступ: | https://ucj.org.ua/index.php/journal/article/view/255 |
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| Назва журналу: | Ukrainian Chemistry Journal |
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oai:ojs2.1444248.nisspano.web.hosting-test.net:article-2552020-12-15T17:27:53Z INTERACTION OF TITANIUM DIOXIDE WITH EUTECTIC MELT NaCl - CaCl2 ВЗАЄМОДІЯ ДІОКСИДУ ТИТАНУ З ЕВТЕКТИЧНИМ РОЗПЛАВОМ NaCl – CaCl2 Omel’chuk , Anatoliy Ivanenko , Olexandr Pohorenko , Yuliia Pavlenko , Tamara Skryptun, Igor titanium dioxide, calcium chloride, sodium chloride, eutectic melt, interaction. The results of studies of the interaction of titanium dioxide with the eutectic melt of (0.48) NaCl–(0.52) CaCl2 (mol.) in the temperature range of 823–1073 K are shown. It is established that the interaction of titanium dioxide with the melt of sodium chlorides and calcium is accompanied by the formation in the salt phase of titanium compounds soluble in 1.0% solution of hydrochloric acid, and in the solid residue is recorded calcium titanate, and the number of products formed in both phases substantially. At temperatures above 923 K is formed calcium titanate, the relative amount of which increases with increasing temperature by reducing the equilibrium content of titanium compounds in the salt phase. At temperatures below 923 K, calcium titanate was not detected in the interaction products, and the content of titanium compounds in the salt phase was higher than at higher temperatures. The absence of calcium titanate in the solid residue after prolonged isothermal contact of TiO2 with the NaCl-CaCl2 melt in the temperature range 823–923 K may be due to the fact that at such temperatures, the dissolution of titanium dioxide occurs by physical mechanism or by a mixed physicochemical mechanism. The results of the calculations by the Schroeder-Le Chatelier equation support this. In the specified temperature range, the concentration of titanium compounds increases with temperature. Starting from 923 K the nature of the interaction between titanium dioxide and the melt changes. Apparently at such temperatures (923–1073 K), the contribution of the chemical interaction between the components accompanied by the formation of calcium metatanate and volatile titanium compounds is dominant. The quantitative content of the phase, which in composition in the solid residue is identified as CaTiO3, increases, and the number of titanium compounds in the salt phase (based on TiO2) decreases. The change of isobaric isothermal potential (∆G) in the temperature range of 300–1300 K of the exchange reactions between sodium chloride and calcium and titanium oxide is positive, so self-directed course is unlikely. The lowest Gibbs free energy values correspond to the reaction of the interaction of calcium chloride with titanium dioxide to form titanate or calcium oxide and tetrachloride or titanium oxochloride. V.I.Vernadsky Institute of General and Inorganic Chemistry 2020-12-15 Article Article Physical chemistry Физическая xимия Фізична xімія application/pdf https://ucj.org.ua/index.php/journal/article/view/255 10.33609/2708-129X.86.11.2020.24-33 Ukrainian Chemistry Journal; Vol. 86 No. 11 (2020): Ukrainian Chemistry Journal; 24-33 Украинский химический журнал; Том 86 № 11 (2020): Украинский химический журнал; 24-33 Український хімічний журнал; Том 86 № 11 (2020): Український хімічний журнал; 24-33 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/255/140 |
| institution |
Ukrainian Chemistry Journal |
| baseUrl_str |
|
| datestamp_date |
2020-12-15T17:27:53Z |
| collection |
OJS |
| language |
English |
| topic_facet |
titanium dioxide calcium chloride sodium chloride eutectic melt interaction. |
| format |
Article |
| author |
Omel’chuk , Anatoliy Ivanenko , Olexandr Pohorenko , Yuliia Pavlenko , Tamara Skryptun, Igor |
| spellingShingle |
Omel’chuk , Anatoliy Ivanenko , Olexandr Pohorenko , Yuliia Pavlenko , Tamara Skryptun, Igor ВЗАЄМОДІЯ ДІОКСИДУ ТИТАНУ З ЕВТЕКТИЧНИМ РОЗПЛАВОМ NaCl – CaCl2 |
| author_facet |
Omel’chuk , Anatoliy Ivanenko , Olexandr Pohorenko , Yuliia Pavlenko , Tamara Skryptun, Igor |
| author_sort |
Omel’chuk , Anatoliy |
| title |
ВЗАЄМОДІЯ ДІОКСИДУ ТИТАНУ З ЕВТЕКТИЧНИМ РОЗПЛАВОМ NaCl – CaCl2 |
| title_short |
ВЗАЄМОДІЯ ДІОКСИДУ ТИТАНУ З ЕВТЕКТИЧНИМ РОЗПЛАВОМ NaCl – CaCl2 |
| title_full |
ВЗАЄМОДІЯ ДІОКСИДУ ТИТАНУ З ЕВТЕКТИЧНИМ РОЗПЛАВОМ NaCl – CaCl2 |
| title_fullStr |
ВЗАЄМОДІЯ ДІОКСИДУ ТИТАНУ З ЕВТЕКТИЧНИМ РОЗПЛАВОМ NaCl – CaCl2 |
| title_full_unstemmed |
ВЗАЄМОДІЯ ДІОКСИДУ ТИТАНУ З ЕВТЕКТИЧНИМ РОЗПЛАВОМ NaCl – CaCl2 |
| title_sort |
взаємодія діоксиду титану з евтектичним розплавом nacl – cacl2 |
| title_alt |
INTERACTION OF TITANIUM DIOXIDE WITH EUTECTIC MELT NaCl - CaCl2 |
| description |
The results of studies of the interaction of titanium dioxide with the eutectic melt of (0.48) NaCl–(0.52) CaCl2 (mol.) in the temperature range of 823–1073 K are shown. It is established that the interaction of titanium dioxide with the melt of sodium chlorides and calcium is accompanied by the formation in the salt phase of titanium compounds soluble in 1.0% solution of hydrochloric acid, and in the solid residue is recorded calcium titanate, and the number of products formed in both phases substantially. At temperatures above 923 K is formed calcium titanate, the relative amount of which increases with increasing temperature by reducing the equilibrium content of titanium compounds in the salt phase. At temperatures below 923 K, calcium titanate was not detected in the interaction products, and the content of titanium compounds in the salt phase was higher than at higher temperatures.
The absence of calcium titanate in the solid residue after prolonged isothermal contact of TiO2 with the NaCl-CaCl2 melt in the temperature range 823–923 K may be due to the fact that at such temperatures, the dissolution of titanium dioxide occurs by physical mechanism or by a mixed physicochemical mechanism. The results of the calculations by the Schroeder-Le Chatelier equation support this. In the specified temperature range, the concentration of titanium compounds increases with temperature. Starting from 923 K the nature of the interaction between titanium dioxide and the melt changes. Apparently at such temperatures (923–1073 K), the contribution of the chemical interaction between the components accompanied by the formation of calcium metatanate and volatile titanium compounds is dominant. The quantitative content of the phase, which in composition in the solid residue is identified as CaTiO3, increases, and the number of titanium compounds in the salt phase (based on TiO2) decreases.
The change of isobaric isothermal potential (∆G) in the temperature range of 300–1300 K of the exchange reactions between sodium chloride and calcium and titanium oxide is positive, so self-directed course is unlikely. The lowest Gibbs free energy values correspond to the reaction of the interaction of calcium chloride with titanium dioxide to form titanate or calcium oxide and tetrachloride or titanium oxochloride. |
| publisher |
V.I.Vernadsky Institute of General and Inorganic Chemistry |
| publishDate |
2020 |
| url |
https://ucj.org.ua/index.php/journal/article/view/255 |
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