RU2571764C1 - Method of sorption extraction of uranium from fluorine-containing environments - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: method of sorption extraction of uranium from fluorine-containing environments on chelating ionites with amino phosphonic groups is sorption of the uranium upon ratio of phases ionite:solution 1:2.5 - 1:1000, and at fluorine content 5-20 g/l ensuring ration F^-:H₂SO₄ = 1 - 0:4 by sulphuric acid addition to the solution.

EFFECT: invention increases capacity of ionite as per uranium and reduces residual concentration of uranium in cleaned solution.

1 ex, 1 tbl

Description

The invention relates to hydrometallurgy and can be used to extract uranium from solutions of radiochemical industries.

A known method of extraction extraction of uranium from fluorine-containing solutions / C. Harrington, A. Ruele. Technology for the production of uranium, Gosatomizdat, M., 1961, p. 29-30 /. The method is ineffective, due to the negative influence of the fluorine ion on the extraction, the necessary degree of purification from uranium is not achieved.

A known method of extracting uranium from the wastewater of a uranium conversion nanoporous silica adsorbent in the presence of nitrate, sulfate, chloride, fluoride and phosphate / M. Samadfam International journal of Environmental Science and Technology (Impact Factor: 1.84) 09/2012; DOI: 10.1007 / sl3762-012-0065-3 /. The method is characterized by low performance in the presence of fluorine ions, increased material costs and does not provide the required degree of purification from uranium.

The closest in technical essence and the achieved result to the claimed method is a method of sorption extraction of uranium from fluorine-containing media on ion exchangers, in which the extraction of uranium is carried out on chelating ion exchangers with aminophosphorus groups from solutions containing 5-20 g / l of fluorine (Patent US 6165367 A, C. C02F 1/42, publ. 12/26/2000).

The technical result consists in the fact that the proposed method can significantly increase the capacity of the ion exchanger for uranium and reduce the residual concentration of uranium in the solution being cleaned.

The technical result is achieved due to the fact that the method of sorption extraction of uranium from fluorine-containing media on chelating ion-exchangers with aminophosphorus groups is carried out from solutions containing 5-20 g / l of fluorine, with an ion exchanger: solution ratio of 1: 2.5 ÷ 1: 1000, providing the ratio F: H ₂ SO ₄ = 1 ÷ 0: 4 by adding sulfuric acid to the solution.

The lower limit of the amount of ion exchanger is due to the fact that the effect of increasing the capacity for uranium is not achieved, and the upper limit is limited by a slight change in technological parameters. The maximum fluorine content to sulfuric acid is due to a decrease in the efficiency of uranium sorption.

The method is implemented as follows.

Example

Uranium was sorbed on a chelating ion exchanger Purolite S950 with aminophosphonic groups from sulfate-containing solutions with a content in g / l: U ~ 1; SO ₄ ² - 40; Na ⁺ - up to 20; NH ₄ ⁺ - up to 30; F ^- - 0-20 g / l with a phase ratio of ion exchanger: solution equal to 1: 2.5 ÷ 1: 1000 for 24 hours. Uranium desorption from saturated ion exchanger was carried out with a 15% sodium carbonate solution. In parallel, the process was carried out according to the prototype method. The data are given in table. one.

The experiments established that uranium sorption from the fluorine-containing solution using a chelating ion exchanger with aminophosphonic groups at a ratio of ion exchanger phase: solution of 1: 2,5-1: 1000, and at a ratio of F ^-: H ₂ SO ₄ = 1 ÷ 0: 4 allows you to increase the capacity for uranium by 20-50%, as well as reduce the residual concentration of uranium in solution and, accordingly, increase the degree of uranium extraction, which will subsequently lead to a significant improvement in the technical and economic indicators of the process.

Thus, the implementation of the proposed method will improve the efficiency of the process of extracting uranium from fluorine-containing media and improve technological schemes for the processing of waste from radiochemical industries.

Claims (1)

The method of sorption extraction of uranium from fluorine-containing media on chelating ion exchangers with aminophosphonic groups, characterized in that the sorption of uranium is carried out at an ion-exchange: phase ratio of 1: 2.5-1: 1000 and a fluorine content of 5-20 g / l, providing ratio F ^- : H ₂ SO ₄ = 1 ÷ 0: 4 by adding sulfuric acid to the solution.