Studies on the kinetics of carbon tetrachloride chlorination of tantalum pentoxide
Studies on the kinetics of chlorination of tantalum pentoxide powder by carbon tetrachloride vapor in dilution with nitrogen have been carried out by weight-loss measurements in two temperature ranges, i.e., 698 to 773 K and 793 to 853 K. The effect of time, temperature, and partial pressure of CCl...
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| Veröffentlicht in: | Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2001-10, Vol.32 (5), p.801-810 |
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| container_title | Metallurgical and materials transactions. B, Process metallurgy and materials processing science |
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| creator | JENA, P. K BROCCHI, E. A LIMA, M. P. A. C |
| description | Studies on the kinetics of chlorination of tantalum pentoxide powder by carbon tetrachloride vapor in dilution with nitrogen have been carried out by weight-loss measurements in two temperature ranges, i.e., 698 to 773 K and 793 to 853 K. The effect of time, temperature, and partial pressure of CCl sub 4 (P sub CCl4 ) on the kinetics of chlorination of the powder Ta sub 2 O sub 5 , (-105 + 74 mu m) has been investigated. In both the temperature ranges, the chlorination results have been found to fit the following relationship during the 'initial periods:' In the 'latter periods' of the chlorination of Ta sub 2 O sub 5 , the following relationship was found to be applicable in both the temperature ranges. Based on these kinetics results, two different mechanisms for the Chlorination of Ta sub 2 O sub 5 by CCl sub 4 vapor have been suggested for the two temperature ranges studied. It was possible to chlorinate > 92 pct of Ta sub 2 O sub 5 (-105 + 74 mu m) at 833 K in 210 minutes, by using CCl sub 4 at a partial pressure of 0.6 atm. |
| doi_str_mv | 10.1007/s11663-001-0067-x |
| format | Article |
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K ; BROCCHI, E. A ; LIMA, M. P. A. C</creator><creatorcontrib>JENA, P. K ; BROCCHI, E. A ; LIMA, M. P. A. C</creatorcontrib><description>Studies on the kinetics of chlorination of tantalum pentoxide powder by carbon tetrachloride vapor in dilution with nitrogen have been carried out by weight-loss measurements in two temperature ranges, i.e., 698 to 773 K and 793 to 853 K. The effect of time, temperature, and partial pressure of CCl sub 4 (P sub CCl4 ) on the kinetics of chlorination of the powder Ta sub 2 O sub 5 , (-105 + 74 mu m) has been investigated. In both the temperature ranges, the chlorination results have been found to fit the following relationship during the 'initial periods:' In the 'latter periods' of the chlorination of Ta sub 2 O sub 5 , the following relationship was found to be applicable in both the temperature ranges. Based on these kinetics results, two different mechanisms for the Chlorination of Ta sub 2 O sub 5 by CCl sub 4 vapor have been suggested for the two temperature ranges studied. It was possible to chlorinate > 92 pct of Ta sub 2 O sub 5 (-105 + 74 mu m) at 833 K in 210 minutes, by using CCl sub 4 at a partial pressure of 0.6 atm.</description><identifier>ISSN: 1073-5615</identifier><identifier>EISSN: 1543-1916</identifier><identifier>DOI: 10.1007/s11663-001-0067-x</identifier><identifier>CODEN: MTTBCR</identifier><language>eng</language><publisher>Heidelberg: Springer</publisher><subject>Applied sciences ; Exact sciences and technology ; Metals. Metallurgy ; Production of metals ; Production of non ferrous metals. Process materials ; Pyrometallurgy</subject><ispartof>Metallurgical and materials transactions. 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In both the temperature ranges, the chlorination results have been found to fit the following relationship during the 'initial periods:' In the 'latter periods' of the chlorination of Ta sub 2 O sub 5 , the following relationship was found to be applicable in both the temperature ranges. Based on these kinetics results, two different mechanisms for the Chlorination of Ta sub 2 O sub 5 by CCl sub 4 vapor have been suggested for the two temperature ranges studied. It was possible to chlorinate > 92 pct of Ta sub 2 O sub 5 (-105 + 74 mu m) at 833 K in 210 minutes, by using CCl sub 4 at a partial pressure of 0.6 atm.</description><subject>Applied sciences</subject><subject>Exact sciences and technology</subject><subject>Metals. Metallurgy</subject><subject>Production of metals</subject><subject>Production of non ferrous metals. 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B, Process metallurgy and materials processing science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>JENA, P. K</au><au>BROCCHI, E. A</au><au>LIMA, M. P. A. C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Studies on the kinetics of carbon tetrachloride chlorination of tantalum pentoxide</atitle><jtitle>Metallurgical and materials transactions. B, Process metallurgy and materials processing science</jtitle><date>2001-10-01</date><risdate>2001</risdate><volume>32</volume><issue>5</issue><spage>801</spage><epage>810</epage><pages>801-810</pages><issn>1073-5615</issn><eissn>1543-1916</eissn><coden>MTTBCR</coden><abstract>Studies on the kinetics of chlorination of tantalum pentoxide powder by carbon tetrachloride vapor in dilution with nitrogen have been carried out by weight-loss measurements in two temperature ranges, i.e., 698 to 773 K and 793 to 853 K. The effect of time, temperature, and partial pressure of CCl sub 4 (P sub CCl4 ) on the kinetics of chlorination of the powder Ta sub 2 O sub 5 , (-105 + 74 mu m) has been investigated. In both the temperature ranges, the chlorination results have been found to fit the following relationship during the 'initial periods:' In the 'latter periods' of the chlorination of Ta sub 2 O sub 5 , the following relationship was found to be applicable in both the temperature ranges. Based on these kinetics results, two different mechanisms for the Chlorination of Ta sub 2 O sub 5 by CCl sub 4 vapor have been suggested for the two temperature ranges studied. It was possible to chlorinate > 92 pct of Ta sub 2 O sub 5 (-105 + 74 mu m) at 833 K in 210 minutes, by using CCl sub 4 at a partial pressure of 0.6 atm.</abstract><cop>Heidelberg</cop><pub>Springer</pub><doi>10.1007/s11663-001-0067-x</doi><tpages>10</tpages></addata></record> |
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| subjects | Applied sciences Exact sciences and technology Metals. Metallurgy Production of metals Production of non ferrous metals. Process materials Pyrometallurgy |
| title | Studies on the kinetics of carbon tetrachloride chlorination of tantalum pentoxide |
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