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Журналы →  Tsvetnye Metally →  2009 →  №10 →  Назад

Magnesium, titanium, rare metals, semiconductors
Название Kinetics of the processes of crystallization of compound of rare earth metals at inoculating phases
Автор Cheremisina O. V.
Информация об авторе Cheremisina O. V., phone: (812) 328-84-09
Реферат It is investigated kinetic processes of crystallizations on beginning phases of phosphates and fluorides of cerium (III), and also phosphates and fluorides lanthanides from prevalue on them industrial phosphor-acid the solutions received in result sylphs acids of opening of the Kola apatites. Values of constants of speed of crystallization of phosphate of cerium from modelling solutions of a phosphoric acid on primings СеРО4 · 0,5Н2О, СаSО4 · 0,5Н2О and without use of primings are received, on which value sizes energy activation Еact of processes of the crystallization showing repeated downturn activation of a barrier (from value 119,7 up to 37,3 kDg/mol) are designed at carrying out of crystallization for surfaces of a priming. Limiting stages of process of crystallization on a surface rabdophanite are determined: chemical reaction re-protoning a complex [Ce(H2O)n(Н2РО4)]2+aq and internal diffusion (process of transport of substance to an internal surface of a priming).
Ключевые слова Kinetics, crystallization, rare-earth metals, sulphuric acid drill, Kola apatite, energy of activation, rhabdophanite, deprotonation, internal diffusion.
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Language of full-text русский
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