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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 764 pages |
| ISBN: | 978-0-9879917-5-1 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
The Recovery Of Scandium From Sulfuric Acide Solution Of Complex Saline Composition
Iulia Sokolova1; Vladimir Koryakov2;1NATIONAL UNIVERSITY OF SCIENCE AND TECHNOLOGY "MIS, Moscow, Russia; 2OOO INTERMIX MET, Lermontov, Russia;
Type of Paper: Regular
Id Paper: 431
Topic: 14
Abstract:
An experimental investigation and optimization of the parameters of Sc extraction from a solution having the composition 0.024-0.034 g/l Sc(III); 8,6-11,9 g/l Fe(III); 0.11-0.19 g/l Ti(IV); 0,09-0,28 g/l Zr(IV), 0,08-0,155 g/l U(VI) and 80-130 g/l H2SO4 by means of a (0,1-0,3 mol) di(2-ethylhexyl)phosphoric acid (DEHPA) solution in kerosene together and reextraction of scandium by a 1-4% sodium fluoride solution accompanied by the production of rough scandium fluoride concentrate are conducted. It is established that the indicators of Sc extraction when performed in stages are determined by the DEHPA content and the residual concentration of Sc in the reverse organic phase.Mathematical models of the extraction and reextraction of scandium are proposed, and through use of these models nomograms are obtained that make it possible to determine the maximally possible extraction of Sc and maximally admissible phase ratio in the operations. It is shown that the extraction and content of Sc in rouch scandium fluoride concentrate are determined by the NaF concentration in the reextractant and the phase ratio in the operations. The optimal and feasible conditions for reextraction of Sc are determined in a combined review of the different mathematical models. It is established that the residual content of Sc in a NaF solution is determined by the concentration of Sc in the saturated organic phase and of U(VI) in the initial solution.