Method of extracting yttrium (iii) from salt solutions

FIELD: chemistry.

SUBSTANCE: method of extracting yttrium (III) from salt solutions involves floatation extraction using an organic phase and a collector. The organic phase used is isooctyl alcohol. The collector used is an anionic surfactant - sodiium dodecyl suphate in a concentration which corresponds to the stoichiometry: Y+3+SDS-=Y[DS]3, where Y+3 is a yttrium cation, DS- is a dodecyl sulphate ion. Floatation extraction is carried out at pH=7.0-7.8 and ratio of the organic phase to the aqueous phase of 1/20-1/40.

EFFECT: high degree of extraction of yttrium.

2 dwg, 1 ex

 

The invention relates to enrichment, in particular to methods for rare earth metals (REM) or their oxides from poor or man-made materials using the method of protectable.

The method for extracting zinc and copper foam protectable, where as the collector used the sodium naphthenate (Demidov E, Voronin NN, Cherkasov A. Combined flotation-extraction processing technology solutions. Non-ferrous metals, No. 10, 1995, P.64-67.).

The disadvantage of this method is not sufficiently complete removal of metal cations from solutions in a complex process involving two stages: flotation and extraction.

The method for extracting zinc and copper method protectable using as the collector naphthenate complexes and tetrabutylammonium ions (Y.S.Kim, J.H.Shina, Y.S.Choia, W.Lee, Y.I.Lee Determination of Zinc and Lead in water samples by solvent sublation using ion pairing of metal-naphthoate complexes and tetra-n-butylammonium fluoride ion. Bull. Korean Chem. Soc. 2001. V.22. P.821-826).

The disadvantage of this method is not sufficiently complete removal of metal ions from solution.

The method for extracting cations of iron in the form of tetrachloroferrate-ions by the method of protectable (Elhanan J., Karger Century Solvent sublation of iron (III) chloride. Anal. Chem. 1968. V.41. No. 4. P.671-674), adopted for the prototype. Fluoexetine extraction was performed from aqueous solutions using as the organic phase of anisole. the quality of the collector used three-octylamine hydrochloride. Iron extraction was about 40%. This method achieves a very low degree of extraction of cations of iron.

The technical result of the invention is to increase the degree of extraction of yttrium.

The technical result is achieved in that in the method of extraction of yttrium (III) from solutions of salts, including protectrail organic phase and the collector, as the organic phase used isooctyl alcohol, and as a collector of used surfactants of the anionic type sodium dodecyl sulphate at a concentration corresponding to the stoichiometry of the reaction:

Y+3+3DS-=Y, [DS]3,

where Y+3- cations of yttrium (III), DS-- dodecyl sulphate-ion, the process of photoexcitable carried out at pH 7.0-7.8 and the ratio of organic and aqueous phase 1/20-1/40.

Use as a collector of anionic type surfactants sodium dodecyl sulfate provides an increase in the degree of extraction of cations of yttrium (III) in the process of protectable. Sodium dodecyl sulphate is a transport agent in this process and is not consumed. In solution, the cations of yttrium (III) form with sodium dodecyl sulfate stable complexes, which are due to the hydrophobicity of the alkyl radicals are transferred to the organic phase is isooctyl alcohol.

Parameter extraction of cations of yttrium (III) t is aetsa the distribution coefficient K p. The value of Kpextracted ion between aqueous and organic phases was calculated by the ratio of the concentration [Y+3] in the organic phase to the concentration [Y+3] in aqueous solution according to the formula: K=[Y+3]org/[Y+3]aq.

It is found experimentally that the value of the coefficient of distribution of yttrium between aqueous and organic phases depends on the pH of the solution. The process of protectable at pH 7,0-7,8 provides an increase in the degree of extraction of cations of yttrium (III) not less than 99%.

The ratio of organic and aqueous phases 1/20 - 1/40 also provides an increase in the degree of extraction of cations of yttrium (III) not less than 99% (experimentally obtained).

The method is as follows. To aqueous salt solution of yttrium (III) add collector - surfactants of the anionic type, mix, bring pH to 7,0-7,8. As anionic surfactants of the type used sodium dodecyl sulphate, the concentration of which corresponds to the specified stoichiometry of the reaction. Add the organic phase, which use isooctyl alcohol, in a ratio of organic and aqueous phase 1/20-1/40. Protectrail be performed within 15 minutes After protectable solution to analyze the content of cations of yttrium (III).

The method is illustrated by example. Spend protectrail in the column, is made in view of the cylinder, the bottom of which served as a filter SCHOTT. To 200 ml of a solution of yttrium nitrate concentration of 0.001 mol/l was added anionic type surfactants sodium dodecyl sulphate in an amount corresponding to the concentration of 0.003 mol/L. pH of the aqueous solution was brought to 7.5 to 8.5. The solution was poured into a column was added 10 ml of organic phase isooctyl alcohol and was in the process of protectable within 15 minutes After protectable solution remaining in the column was analyzed for cations of yttrium (III).

Figure 1 presents the dependence of the distribution coefficients of ions of yttrium (III) from the pH of aqueous solutions of salts. Figure 2 presents experimental data on photoextract.com cations of yttrium (III) from nitrate solutions of its salts using sodium dodecyl sulfate. The experiment showed that at pH values of 7.4 extraction of cations of yttrium (III) from the solution reaches not less than 99%.

Thus, the method allows to increase the degree of extraction of yttrium (III) from a solution of its salts.

The method of extraction of yttrium (III) from solutions of salts, including protectrail organic phase and a collector, wherein as the organic phase used isooctyl alcohol, and as a collector of used surfactants of the anionic type sodium dodecyl sulphate at a concentration corresponding to the stoichiometry of the reaction Y +3+3DS-=Y, [DS]3,
where Y+3- cations of yttrium,
DS-- dodecyl sulphate-ion,
protectrail carried out at pH 7.0-7.8 and the ratio of organic and aqueous phase of 1:20 to 1:40.



 

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