Kinetics of scandium recovery by TVEX-TBP from the solution formed after the salt chlorinator cake leaching

Vadym Korovin,Oleksandr Valiaiev,Yurii Shestak,Jose Luis Cortina,Yurii Pohorielov,A Bulat,Y Kryzhanivskyi,B Liu,O Voloshyn,O Zhevzhyk,V Heyets

doi:10.1051/e3sconf/202016800050

Abstract

Kinetics of scandium recovery by TVEX containing tributyl phosphate was studied from the clarified leaching solution of salt chlorinator cake. To assess the contribution of each diffusion phase, experimental data were analyzed using a graphic method. To define the contribution of chemical interaction into the scandium extraction process, recovery kinetics was quantitatively described using pseudo-first order, pseudo-second order kinetic models and Elovich equation in linearized form. It was established that recovery kinetics was most accurately described with the pseudo-second-order model.

Highlights

Impregnated resins and Levextrel-type materials known as "Solid Extractants" (TVEX) in countries of the Commonwealth of Independent States, which combine properties of ionexchange resins and solvent extractants, are increasingly used for scandium recovery in addition to solvent extraction and sorption [1]
As it is seen from the data obtained, TVEX-tributyl phosphate (TBP) featured high kinetic characteristics; about 80 % of scandium were recovered during 1.5 hours
TVEX-TBP high kinetic parameters were due to its meso- and macroporous structure, which had the following parameters [10] according to the mercury porosimetry data: total pore volume 1.39 cm3/g, specific surface area 163.42 m2/g, and average effective pore radius 16.95 nm

Summary

Introduction

Impregnated resins and Levextrel-type materials known as "Solid Extractants" (TVEX) in countries of the Commonwealth of Independent States, which combine properties of ionexchange resins and solvent extractants, are increasingly used for scandium recovery in addition to solvent extraction and sorption [1]. This technology was named TVEX-Sc-Process [9, 10] and tested later at Zaporizhzhia Titanium and Magnesium Combine

Methods

Results

Conclusion