The way desorption rhenium

 

(57) Abstract:

The invention relates to hydrometallurgy rare metals and can be used for desorption of rhenium. The way desorption rhenium includes contacting the sorbent with an organic extractant. The contacting is carried out at a volume ratio between the liquid and solid phases of 0.05-0.5:1, and obtained after contacting the sorbent is treated with a solution of ammonia or hydrogen sulfide in the nonaqueous solvent at a ratio of volumes of the solution and sorbent 3-6:1 and a temperature of 10-25oC. Method allows us to simplify the hydrometallurgical process for extraction of rhenium by eliminating at the stage of regeneration of the sorbent operations concentration. This prevents the possibility of contamination of the obtained product impurities, soluble in reextracted aqueous solution, reduced consumption of reagents, reduced solutions after conducting all operations regeneration, which reduces the amount of wastewater. When used as a Stripping solution of a nonaqueous solvent, saturated with gaseous reagent, there is a possibility of separation of the resulting mixture of substances by distillation and recycled. Processing of obrazu compounds of rhenium in nonaqueous solvents under selected temperature conditions.

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

A known method of extraction of rhenium from aqueous solution by adsorption on active coal with subsequent regeneration of the adsorbed rhenium water-soluble alcohol or Vodopyanova mixture (U.S. Pat. USA 3862292. Method of extraction of rhenium. CL. 01 G 47/00, NCI 423-49. Publ. 21.01.75, so 930, 3).

The resulting solutions should be processed with the purpose of concentration and purification allocated metal.

Closest to the proposed invention to the technical essence and the achieved result is the method of extraction desorption of rhenium with a strongly basic anion-exchange resin tributyl phosphate, saturated hydrochloric acid (U.S. Pat. USA 4521381. Recovery of Rhenium. CL. C 01 G 47/00, NCI 423-49. Publ. 04.06.85).

To extract rhenium obtained organic solution of tributyl phosphate (extract) is subjected to additional operations - Stripping aqueous solution of ammonia, and the resulting reextract,. containing ammonium perrhenate - concentration to produce crystals of ammonium perrhenate.

The objective of the invention is to develop a method of desorption of rhenium with technical re is such a result is achieved by the method of desorption of rhenium, including the contacting of the adsorbent with an organic extractant, according to the invention, the contacting is conducted with an organic extractant or its solution in the volume ratio between the liquid and solid phases of 0.05-0.5:1, and obtained after contacting the sorbent is treated with a solution of ammonia or hydrogen sulfide in the nonaqueous solvent at a ratio of volumes of the solution and sorbent 3-6:1 and a temperature of 10-25oC.

The contacting of the adsorbent with a solvent or solution is carried out as follows: rinsed after saturation rhenium sorbent process within 5-30 min extractant or its solution in the volume ratio between the liquid and solid phases of 0.05-0.5:1. Desorption from the thus treated material is conducted for 0.5 to 3.0 hours nonaqueous gaseous reagent is ammonia or hydrogen sulfide at a ratio of phases 3,0-6,0 amounts of non-aqueous solution of 1 volume of the sorbent. In the process rhenium goes into solution with the formation of a solid residue, which contributes to the shift of the equilibrium in the direction of his education and to increase the degree of desorption.

The selected temperature range (10-25oC) carrying out desorption provides a low solubility of the deposited sedimentary process more than 25oWith can lead to increased losses non-aqueous solvent by evaporation.

The difference of the proposed method from the known is much smaller quantity of solvent or solution required for desorption, the combination of several operations (re-extraction, phase separation, concentration) during desorption of the activated sorbent solution of gaseous reagent (ammonia or hydrogen sulfide) in the nonaqueous solvent and obtaining a solid product - sediment rhenium compounds.

The proposed method allows to reduce the quantity of solvent or solution in 2-10 times, to simplify the process by reducing the number of operations due to their combination, and to concentrate the product in the form of sediment.

Example 1.

10 ml of strong base anion exchanger AMP, rich rhenium content of 31.5 mg/g) was contacted for 30 min with 4 ml of a 7% solution of trialkylamine in sentine with 10% addition of octanol. To the thus treated the ion exchanger was added 30 ml of isopropyl alcohol saturated with ammonia to the concentration of 1,2-called Desorption measurements were performed within 2 h under stirring and the temperature of the 22oC. the Crystals of ammonium perrhenate appeared after 5 min after h is

5 ml of activated charcoal SCS rich rhenium to 10.4 mg/g, was contacted for 5 min with 0.5 ml of a 7% solution of trialkylamine in sentine with 10% addition of octanol. To the thus treated the adsorbent was added 40 ml of ethyl alcohol previously saturated with ammonia to the concentration of 1,3-called Desorption measurements were performed for 0.5 h under stirring at a temperature of 10oC. the Formation of crystals was observed after 6 min after the start of the process. The degree of extraction of rhenium from coal amounted to almost 100%, and the yield in the crystals of 85.1%.

Example 3.

5 ml of carbon sorbent SKN-rich rhenium to 45.8 mg/g, was in contact with 2 ml of tributyl phosphate for 30 minutes To thus treated carbon sorbent was added 30 ml of isopropyl alcohol saturated with ammonia up to a concentration of 1 N. Desorption was performed under stirring for 2 h and a temperature of 20oC. After 5 min after the start of the process was observed in the precipitation of crystals. The degree of desorption of rhenium was 98,3%, and the yield in crystals - 75,4%.

The proposed method allows to simplify the hydrometallurgical process for extraction of rhenium by eliminating at the stage of regeneration of the sorbent operations concentration. Extragonadal aqueous solution, reduced consumption of reagents, reduced solutions after conducting all operations regeneration, which reduces the amount of wastewater. When used as a Stripping solution of a nonaqueous solvent, saturated with gaseous reagent, there is a possibility of separation of the resulting mixture of substances by distillation and recycled. Processing generated in the process mother liquor is also facilitated due to the low solubility of the drop-down crystals of compounds of rhenium in nonaqueous solvents under selected temperature conditions.

The way desorption rhenium, comprising contacting the sorbent with an organic extractant, wherein the contacting is conducted with an organic extractant or its solution in the volume ratio between the liquid and solid phases of 0.05-0.5: 1, and obtained after contacting the sorbent is treated with a solution of ammonia or hydrogen sulfide in the nonaqueous solvent at a ratio of volumes of the solution and sorbent 3-6: 1 and a temperature of 10-25oC.

 

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SUBSTANCE: invention relates to sorption-mediated recovery of molybdenum from solutions containing heavy metal cations. Method of invention comprises providing solution to be treated, sorption of molybdenum(VI) on anionite at pH < 7. Sorption is conducted from solutions with anionites AM-2b and AMP at solution pH below pH of hydrolytic precipitation of heavy metal cations but higher than pH of formation of molybdenum cations (pH ~ 1).

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9 dwg, 3 tbl, 4 ex

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