Scientific journal
European Journal of Natural History
ISSN 2073-4972

HEAT OSCILLATING EXTRACTION OF RARE EARTH ELEMENTS

Kopyrin A.A., Afonin M.A., Fomichev A.A., Ekzekov M.H.
Using classical extraction for separation of chemically similarly elements requires the necessity of construction of cumbrous many-extractors cascades. As a result of this interest to search new alternative extraction methods just becomes greater.  Work on development and improvement of separation methods based on nonstationary oscillating extraction has been carried on already more than ten years. Various factors deflecting system from stationary state are used: chemical, electrochemical, temperature and other.

Behavior of extraction system in nonstationary conditions using heat oscillating was investigated. Distribution of rare earth elements between two phases in one extractor and their separation between two extractors under these conditions was studied. Different condition of heat oscillating extraction: different oscillating period and different temperature peaks above normal state (25°C) was used. Optimal conditions for separation of elements with similar chemical properties were found.

Following system with simultaneous presence of two metals was investigated: H2O - Nd(NO)3 - Pr(NO)3 - tributyl phosphate - kerosene. Determination of metal concentrations was realized using CCD-based spectrophotometers on-line. Modified experimental setup described in [1] was used. The concentration profiles of rare earth in time in aqueous phases and in organic phase showed the dependence of metal´s concentration ratio on time. This fact can be used to separate similar elements using heat oscillatory extraction.

The Literature:

  1. A. Kopyrin, A. A. Baulin, and M. A. Afonin, Oscillatory Extraction System with a Liquid Membrane for Separating REEs, Radiochemistry, Vol. 47, No. 4, 2005, pp. 387-391. Translated from Radiokhimiya, Vol. 47, No. 4, 2005, pp. 355-358.

The article is admitted to the International Scientific Conference "Contemporary Scientifically Based Technologies", Spain, Tenerife, 2006, November 20-27; came to the editorial office on 27.09.06.