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INVENTION
Patent of the Russian Federation RU2294391

METHOD OF RELIEF EXTRACTION

The name of the inventor: Irina Troshkina (RU); Ushanova Olga Nikolaevna (RU); Serbin Alexander Mikhailovich
The name of the patent holder: Russian Chemical and Technological University. DI. Mendeleyev's
Address for correspondence: 125047, Moscow, Miusskaya Sq., 9, Russian Chemical and Technological University. DI. Mendeleev, Patent Department
Date of commencement of the patent: 2005.06.03

The invention relates to hydrometallurgy of rare metals and can be used for the extraction of rhenium. The method includes sorption of rhenium by a granular super-crosslinked polystyrene impregnated with an extractant and desorption of rhenium with an ammonia solution. Sorption is subjected to a solution containing uranium and leads it on super-crosslinked polystyrene impregnated with cyclohexylamine, in an amount of 1-35 wt.%. The technical result is an increase in the ratio of separation of rhenium and uranium from solutions containing uranium, improving the quality of rhenium eluates and simplifying the process of their further processing.

DESCRIPTION OF THE INVENTION

The invention relates to hydrometallurgy and can be used to extract rhenium from solutions containing uranium.

There are known methods for extracting rhenium from uranium-containing solutions using strongly basic anion exchangers, on which uranium and rhenium are simultaneously sorbed [Ion exchange materials for hydrometallurgy, sewage treatment and water treatment. Directory. Ed. Acad. BN Laskorina. - Moscow: Stroyizdat, 1984. - 201 p.]. A disadvantage of these methods of extracting rhenium is the use of nitrate or hydrohalic solutions as eluents, which does not allow obtaining commodity ammonium perrhenate directly from the eluates.

A method for the selective extraction of rhenium from solutions containing uranium is known, active carbons containing in their composition nitrogen heteroatoms in an amount of 0.7-2 wt.% [As. SU 1266045 A1. MF Sheremetev, VA Golodobina, RA Penzin, EP Kiseleva, LI Sakharova. Method for the separation of rhenium from sulfuric acid solutions]. The drawback of the method is the low mechanical strength of active coals, low coefficients of separation of rhenium and uranium at the sorption stage, characterized by a slowed-down kinetics, the complexity of conducting rhenium desorption.

The closest to the proposed process in terms of technical essence is the rhenium recovery process, which includes the sorption of rhenium on a granular polymer, super-crosslinked polystyrene impregnated with a trialkylamine of the general formula R ₃ N, where R is alkyl radicals (C ₈ -C ₁₀ ), desorption of rhenium with ammonia solution, Concentrated eluates [Pat. 2227170 Russia, IPC ⁷ With 22 In 61/00. Method of extraction of rhenium / SUE VNII chim. technologies. Opubl. 20.04.2004].

The drawback of this method is the low rhenium-uranium separation coefficient in the sorption of rhenium on granules of super-cross-linked polystyrene impregnated with trialkylamine (EP-TAA) from solutions containing uranium.

The object of the invention is to increase the selectivity of the sorbent in the recovery of rhenium from solutions containing uranium.

The objective is achieved using as a sorbent for extracting rhenium from solutions containing uranium granules, super-cross-linked polystyrene impregnated with cyclohexylamine.

The difference between the proposed method and the prototype is that sorption of rhenium is conducted from solutions containing uranium, and granules of cross-linked polystyrene impregnated with cyclohexylamine in an amount of 1-35% by weight are used to increase the selectivity of the sorbent.

The technical result of the invention is that the rhenium and uranium separation factors in the sorption of rhenium from solutions containing uranium on the pellets of super-crosslinked polystyrene impregnated with cyclohexylamine (EP-CGA) are increased, the quality of rhenium eluates is improved, and the process of further processing thereof is simplified.

Example 1

Sorption of rhenium was carried out in static conditions from sulfuric acid solutions (pH 2) containing 100 mg / dm ³ rhenium and 100 mg / dm ³ uranium. The weights of the extracting polymers EP-TAA and EP-CGA (0.1 g) were contacted with stirring with 50 cm ^{3 of the} above solution. The content of rhenium in the solution after sorption was determined by the photocolorimetric method, and the uranium content by the vanadate method.

The results obtained in Table. 1, show that the rhenium-uranium separation coefficient for sorption of rhenium from solutions containing uranium EP-CGA is 7.0 times higher than that of EPA-TAA.

The content of extractants in EP-CGA and EP-TAA is 30-35%.

The regeneration of rhenium from saturated EP-CGA was carried out with a solution containing 8% ammonia in a single step at a phase ratio of T: H = 1: 50 (mg / cm ³ ). Before this, the extracting polymer was filtered off, washed with a small amount of distilled water. The concentration of rhenium in the eluate was 348.0 mg / dm ³ .

The desorption rate was 87%.

Example 2

Sorption of rhenium was carried out under the conditions of Example 1 with the difference that the solution contained 10 mg / l rhenium and 10 mg / g uranium.

The results obtained in Table. 1 show that the rhenium-uranium separation coefficient for sorption of rhenium from solutions containing uranium EP-CGA is 3.5 times higher than that of EPA-TAA.

The content of extractants in EP-CGA and EP-TAA is 30-35%.

The regeneration of rhenium from saturated EP-CGA was carried out with a solution containing 8% ammonia in a single step at a phase ratio of T: H = 1: 50 (mg / cm ³ ). Before this, the extracting polymer was filtered off, washed with a small amount of distilled water. The concentration of rhenium in the eluate was 62.0 mg / dm ³ .

The degree of desorption was 85%.

Example 3

Sorption of rhenium was carried out in static conditions from sulfuric acid solutions (pH 2) containing 100 mg / dm ³ rhenium. A sample of extracting polymer EP-CGA (0.1 g) with an organic phase content of 10% was contacted with stirring with 50 cm ^{3 of the} above solution. The content of rhenium in the solution after sorption was determined by the photocolorimetric method.

The results obtained in Table 3 show that the coefficient of distribution of rhenium EP-CGA when sorbed from sulfuric solutions was 362 cm ³ / g.

The regeneration of rhenium from saturated EP-CGA was carried out with a solution containing 8% ammonia in a single step at a phase ratio of T: H = 1: 50 (mg / cm ³ ). Before this, the extracting polymer was filtered off, washed with a small amount of distilled water. The rhenium concentration in the eluate was 210.0 mg / dm ³ . The degree of desorption was 88%.

Example 4

The regeneration of rhenium from saturated under the conditions of Example 1 of EP-CGA was carried out with a solution containing 8% ammonia in a single step at a phase ratio T: H = 1: 100 (mg / cm ³ ). Before this, the extracting polymer was filtered off, washed with a small amount of distilled water. The degree of desorption was 96%. The rhenium concentration in the eluate was 192.0 mg / dm ³ .

The proposed method makes it possible to increase the selectivity of rhenium extraction from solutions containing uranium 3.5-7 times and to conduct rhenium desorption with an ammonia solution to obtain concentrated solutions of rhenium.

CLAIM

A method for extracting rhenium from solutions, comprising sorbing the rhenium with a granulated super-crosslinked polystyrene impregnated with an extractant, desorbing the rhenium with an ammonia solution, characterized in that the sorption is subjected to a solution containing uranium and is conducted on super-crosslinked polystyrene impregnated with cyclohexylamine in an amount of 1-35% by weight.

print version
Date of publication 15.03.2007гг

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