thin emulsified solutions of trialkylamine in kerosene as collectors for flotation–extraction of thorium (vi) compounds
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2017
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Abstract
The principle possibility of using the thin emulsified solutions of trialkylamine in kerosene as collector of thorium compounds for their flotation extraction has been established. The colloid- chemical properties of the collector water emulsions were defined. The average radius of the emulsion droplets is equal to 1.36·10-7 m, and their electrokinetic potential is equal to +38 mV. The optimal conditions of thorium compounds flotation-extraction process have been determined. These are temperature 293 K, the initial thorium concentration 20 mg/dm3, collector consumption 2 mol TAA/mol Th, flotation time 15 min. The degree of thorium removal is 98%, the degree of emulsions dispersed phase removal is 96% under optimal conditions for floatation-extraction. The kinetics of flotation-extraction is described by the first-order equation. The rate constants and apparent activation energy of flotation-extraction process have been calculated in the temperature range 29-323 K. The rate constants are equal to (3.0-10.5)∙10-4 s-1 and apparent activation energy is equal to 33 kJ/mol. Тhe interaction mechanism for of thorium compounds with the collector at different pH has been proposed. According to this mechanism the thorium compounds such as [ThSO4]2+, [Th( SO4)2]0, [Th(OH)3] +, Th(OH)4, interact with the amino groups of trialkylamine and naphthenic acids of kerosene both on the surface and in the volume of the collector emulsions droplets.
| Reference Key |
perlova2017vsnikthin
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| Authors | ;O. V. Perlova;A. O. Shirykalova;О. О. Khromysheva |
| Journal | Nature communications |
| Year | 2017 |
| DOI |
10.18524/2304-0947.2017.2(62).102212
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