Rhenium desorption method

FIELD: precious metal hydrometallurgy.

SUBSTANCE: rhenium-loaded sorbent is treated with 4-5 M hydrochloric acid in contact with another sorbent, in particular solid extractant containing asymmetric phosphine oxide, after which sorbent is separated from mixture and treated with ammonia or ammonium carbonate solution.

EFFECT: combined rhenium desorption and eluate purification operations.

7 ex

 

The invention relates to hydrometallurgy rare metals and can be used for desorption of rhenium.

Known methods of desorption, based on the difference of the constants of ion exchange sorbents. Contact carboxylic resin in the Na-form with polyelectrolytes (pectin) in H-form is observed almost complete exchange of ions (Griesbach R. Theory and practice of ion exchange: TRANS. with it. - M.: Publishing house of foreign. literature, 1963. - 499 S.).

When desorption of ions uranylacetate with strong-base anion exchange resin AMP, AM, AB-17 in the presence of srednevekovyh anion exchange resin, EDE-10P, EAP-1P in sulfate environment observed transition ions uranylacetate with strong sorbents in srednesrocnye (Divers LI, Shatalov V., Molchanov T.V. Methods desorption of uranium and other valuable components from saturated resin / / / Atomic energy. - 1999. - T. - 4. - S-279).

Known methods of desorption of rhenium with strong-base anion exchange resin as solutions of hydrochloric acid (7 BC) (S.Fischer, V.Meloche. Analyt. Chem., 24, №7, 1952, 1100), and solutions of the mixture of hydrochloric acid chlorides of metals: zinc, copper or cadmium (U.S. Pat. 4572823 USA, MKI 01 G 47/00, NCI 423149. The method of extraction of rhenium). Formed eluate should be subjected to concentration and purification from impurities.

Closest to the proposed invention to the technical essence and the achieved result is way desorption of rhenium with ileoscopy anion exchange resin solutions of hydrochloric acid (S. Fischer, V.Meloche. Analyt. Chem., 24, №7, 1952, 1100).

Object of the invention is the combination of operations desorption rhenium and treatment of the eluate, simplify further processing.

The technical result is achieved by the method of desorption of rhenium with a sorbent solution of hydrochloric acid with a concentration of 4-5 mol/l in contact with other sorbent, followed by the separation of the latter from the mixture, and the elution of rhenium with him with aqueous ammonia or ammonium carbonate. As the injected sorbent use solid extractant containing the phosphine oxide rasoredeleniy. In the process rhenium goes into solution, while Cerberus input on the sorbent, which contributes to the shift in the equilibrium towards desorption and increase its degree.

The selected interval content of hydrochloric acid (4-5 mol/l) in the contact solution provides both the desorption of rhenium from the original sorbent and removing its input sorbent.

The difference of the proposed method from the known is a smaller amount of hydrochloric acid required for desorption, the combination of several operations (Stripping, cleaning of the eluate, concentration) and the receipt of rhenium in a form convenient for further processing.

Example 1. 0.5 g of coal FTD-D, full of rhenium (37,2 mg/g) was contacted within 4 h in medium 4 N. hydrochloric acid (6 ml) with 0.2 is tax HUF. After separation of the spent sorbents analysis of contact solution of rhenium, desirerable rhenium with tax-FORM solution of ammonia (8%). The total degree of desorption of rhenium per contact was 51.0%. When desorption of rhenium from coal FTD-D solution of hydrochloric acid 4 N. when the same ratio of the phases, the degree of desorption was 15%.

Example 2. Rich rhenium anion exchange resin S-p (to 21.6 mg/g) was contacted in the environment 4 N. hydrochloric acid with Solex-FOUR in the conditions of example 1. The total degree of desorption amounted to 51.6 per cent. In a comparative experiment with desorption of rhenium from the anion S-n solution of hydrochloric acid 4 N. when the same ratio of the phases, the degree of desorption was 12%.

Example 3. Rich rhenium anion exchange resin S-p (to 21.6 mg/g) was contacted in the environment 5 N. hydrochloric acid with Solex-FOUR in the conditions of example 1. The total extent of desorption was - 52,3%. In a comparative experiment with desorption of rhenium from the anion S-n solution of hydrochloric acid 5 N. at the same ratio of the phases, the degree of desorption was 25%.

Example 4. Rich rhenium anion exchange resin S-p (to 21.6 mg/g) was contacted in the environment 5 N. hydrochloric acid with Solex-FOUR in the conditions of example 1. Rhenium with Solex-FAURE was desirerable solution of ammonium carbonate (9%). The total extent of desorption was at 55.3%. In a comparative experiment with desorption of rhenium from the anion S-n solution of hydrochloric acid 5 N. Ave the same proportion of the phases, the degree of desorption was 22%.

Example 5. Rich rhenium anion exchange resin S-p (to 21.6 mg/g) was contacted in the environment 4 N. hydrochloric acid with Solex-TBP in the conditions of example 1. The total degree of desorption amounted to 50.1 per cent. In a comparative experiment with desorption of rhenium from the anion S-n solution of hydrochloric acid 4 N. when the same ratio of the phases, the degree of desorption was 12%.

Example 6. Rich rhenium anion exchange resin S-p (to 21.6 mg/g) was contacted in the environment 4h. hydrochloric acid with the anion an-105 in the conditions of example 1. The total extent of desorption was in 53.6%. In a comparative experiment with desorption of rhenium from the anion S-n solution of hydrochloric acid 4 N. when the same ratio of the phases, the degree of desorption was 12%.

Example 7. 0.5 g of coal FTD-D, full of rhenium (37,2 mg/g), was contacted for 4 h in medium 4 N. hydrochloric acid (6 ml) with 0.2 g of tax HUF. After separation of the spent sorbents analysis of contact solution of rhenium. Was desirerable rhenium with tax-FORM solution of ammonia (8%). The total degree of desorption of rhenium for three consecutive contact was 88,0%. When desorption of rhenium from coal FTD-D solution of hydrochloric acid 4 N. when the same ratio of the phases, the degree of desorption of the three contact was 32%.

The proposed method allows to simplify the hydrometallurgical process for extraction of rhenium by combining operations desorption, concentration and purification of the eluate. the ri that reduce the costs of reagents, reduced volumes of solutions used in the process of contact desorption rhenium, you receive the possibility of multiple use of acid.

1. The way desorption of rhenium with a sorbent solution of hydrochloric acid, characterized in that the desorption is carried out at the levels of hydrochloric acid 4-5 mol/l in contact with other sorbent followed by the separation of it from the mixture and elution with aqueous ammonia or ammonium carbonate.

2. The way desorption according to claim 1, characterized in that as another sorbent use solid extractant containing the phosphine oxide rasoredeleniy.



 

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