https://repositorio.ufba.br/handle/ri/8755
Tipo: | Artigo de Periódico |
Título: | Dissociation and solubility variation versus pO2- of scheelite CaWO4 in molten NaCl−KCl (At 1000 K) |
Título(s) alternativo(s): | Journal of Electroanalytical Chemistry and Interfacial Electrochemistry |
Autor(es): | Combes, R. Tremillon, B. Andrade, F. de |
Autor(es): | Combes, R. Tremillon, B. Andrade, F. de |
Abstract: | The conditional solubility of scheelite CaWO 4 in molten NaCI--KC1 (1 : 1) has been studied either in oxobasic or oxoacidic media. In the former case it is increased by formation of sparingly soluble CaO according to: Ca 2+ + 02- ~ CaO(s), pK Ca° = 10800/T-- 5.8 (molality scale) In the later case, WO 2- behaves as an oxobase according to the following equilibria: WO42- ~- WO 3 (s) + 02_ pK 0 = 10.0 at 1000 K 3 WO2--¢- W30120+ 02_ pK 3 = 12.7 at 1000 K The latter equilibrium favours an increase in the W VI solubility when pO 2- is increased, for instance by injection of HC1. The whole set of results has been summarized by a conditional solubility diagram of scheelite versus pO 2-. |
Editora / Evento / Instituição: | Journal of Electroanalytical Chemistry and Interfacial Electrochemistry |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/8755 |
Data do documento: | 1977 |
Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
Arquivo | Descrição | Tamanho | Formato | |
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222.pdf | 1,33 MB | Adobe PDF | Visualizar/Abrir |
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