Search

Results:

Vol. 12 (2009 year), No. 2

Masloboeva S.M., Duboshin G.N., Arutyunyan L.G.
Extraction of heptafluorotantalate from fluoride-sulphuric acid solutions

This paper considers the main approaches to automatic cold smoking process, analyzes the problems that rise during the process specified and gives possible solutions. The attention has been also paid to personal developments in the field specified, that are used for cold smoking process intensification.

(in Russian, стр.7, fig. 7, tables. 3, ref 3, Adobe PDF, Adobe PDF 0 Kb)

Vol. 13 (2010 year), No. 4

Masloboeva S.M., Lebedev V.N., Arutyunyan L.G.
Extraction reprocessing of fluoride-sulphuric acid solutions resulting from plumbomicrolite concentrate decomposition

The paper discusses solvent extraction of high-purity tantalum and niobium compounds from fluoride-sulphuric acid solutions resulting from the acidic decomposition of plumbomicrolite concentrate, proposing a flowsheet for sequential selective extraction of target components. The extraction of Ta(V) was studied using triisoamylphosphate and octanol-1 (OCL-1). The latter has proved to be effective for extracting both Ta(V) and Nb(V). There have been selected optimal regimes for all extraction stages to provide a high quality of target products (Ta2O5, K2TaF7, Nb2O5).

(in Russian, стр.5, fig. 4, tables. 3, ref 5, Adobe PDF, Adobe PDF 0 Kb)

Vol. 13 (2010 year), No. 4

Masloboeva S.M., Arutyunyan L.G.
Obtaining high-purity niobium (V) at decomposition of lithium orthoniobate in fluoride-sulphuric acid medium

The work presents the findings of laboratory investigation and testing of fluoride-sulphuric acid technology, whereby lithium orthoniobate was processed to obtain a high-purity niobium (V) oxide subsequently used in the production of lithium niobate single crystals. The optimal conditions for Li3NbO4 decomposition providing the highest possible level of niobum and lithium transition to solution have been determined. The solvent extraction process of niobium extraction by a mixture of extragents (carboxylic acid dimethyamides of the РЎ10-РЎ13 fraction with Eskeide and octanol-1 as diluents) has been discussed. In the course of experiments, we obtained 10 kg of Nb2O5 satisfying the requirements for the production of LiNbO3.

(in Russian, стр.6, fig. 4, tables. 5, ref 6, Adobe PDF, Adobe PDF 0 Kb)