The Solubility of metal oxides in molten carbonates - why the acid-basic chemistry fails?

Niels Bjerrum, Li Qingfeng, Flemming Borup, Irina Petruchina

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Solubilities of various metal oxides in molten Li/K carbonates have been measured at 650°C under carbon dioxide atmosphere. It is found that the solubility of NiO and PbO decreases with increasing lithium mole fraction and decreasing CO2 partial pressure. On the other hand, the emf measurement shows opposite effects, i.e., decreasing CO2 pressure leads to more negative emf values but increasing lithium content gives more positive emf values. This contradiction is explained by means of a complex formation model. The possible species for lead are proposed to be [Pb(CO3)2]-2 and/or [Pb(CO3) 3]-4. A similar complex chemistry for nickel oxide dissolution might be expected.
Original languageEnglish
Title of host publicationProceedings of The International George Papatheodorou Symposium
Place of PublicationPatras
Publication date1999
Publication statusPublished - 1999
EventThe International George Papatheodorou Symposium - Patras, Greece
Duration: 17 Sept 199919 Sept 1999


ConferenceThe International George Papatheodorou Symposium

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