Etude thermocinetique des phenomenes de dissolution par calorimetrie Calvet a haute temperature dissolution d'alumines dans la cryolithe |
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Authors: | M Yagoubi J P Dubes Y Bertaud R Castanet |
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Institution: | (1) Centre de Thermodynamique et de Microcalorimétrie, CNRS, 26 Rue du 141E RIA, 13003 Marseille, France;(2) Laboratoire de Thermochimie Univ. Provence I, 3, Place V. Hugo, 13003 Marseille;(3) Laboratoire de Recherche des Fabrications, Aluminium-Pechiney, 73300 St Jean de Maurienne |
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Abstract: | Although the thermal curves given by a Calvet calorimeter can be considered representative of the thermogenesis of slow phenomena, this is not the case for the brief thermal effects of dissolution, for example, which need typically no more than twenty minutes. At high temperatures, a numerical method of deconvolution of the recorded signal was applied in order to obtain the proper thermogenesis of the phenomenon. The time constants of the calorimeter were determined from thermal effects due to the dropping into the bath of small quantities of silver and platinum. The method was applied to the dissolution of a-alumina and industrial aluminas in cryolithic baths at 1290 K. The different kinds of alumina could be classified according to their time of dissolution. The dependence of the alumina concentration of the bath on the dissolution rate was also investigated.
Zusammenfassung Die mittels eines Calvet-Kalorimeters erhaltenen thermischen Kurven sind zwar repräsentativ für langsame Phänomene der Thermogenese, nicht jedoch für kurzzeitige thermische Effekte wie z. B. ein Inlösunggehen, das im allgemeinen nicht mehr als 20 Minuten dauert. In solchen Fällen wurde für hohe Temperaturen eine numerische Methode zur Zerlegung des registrierten Signals angewandt, um die reine Thermogenese der Phänomens zu erhalten. Zeitkonstanten des Kalorimeters wurden aus den thermischen Effekten bestimmt, die beim Einwerfen kleiner Silber- und Platinmengen in das Bad auftraten. Die Methode wurde zur Untersuchung der Auflösung von -Aluminiumoxid und industriellen Aluminiumoxidproben in Kryolithbädern bei 1290 K herangezogen. Die verschiedenen Aluminiumoxidarten konnten nach der zur Auflösung notwendigen Zeit klassifiziert werden. Die Abhängigkeit der Auflösungsgeschwindigkeit von der Aluminiumoxidkonzentration des Bades wurde ebenfalls untersucht.
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本文献已被 SpringerLink 等数据库收录! |
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