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INVENTION
Patent of the Russian Federation RU2057071
A METHOD FOR EXTRACTING RENTINA, OXMIUM AND MOUSYAK FROM RENIUM-CONTAINING FLUID SULFURIC ACID
The name of the inventor: Irina Troshkina [RU]; Maiboroda Andrei Borisovich [RU]; Malykhin Viktor Fedorovich [KZ]; Chekmarev Alexander Mikhailovich [RU]; Obruchnikov Andrei Vladimirovich
The name of the patent holder: Moscow Chemical and Technological Institute named after D. I. Mendeleyev
Address for correspondence:
The effective date of the patent: 1993.03.31
Uses: hydrometallurgy of osmium, arsenic and rhenium, the technology of extraction of these metals from acidic solutions, in particular from washing sulfuric acid, used in the wet gas scrubbing system of copper and nickel. SUMMARY OF THE INVENTION: before the extraction of osmium, arsenic and rhenium by tertiary amines, the components are oxidized to achieve a redox potential of 900 to 1200 mV, then the initial wash acid or iron (II) sulfide solution, sodium sulfate or formaldehyde is added until the oxidation-reduction potential 750 - 820 mV.
DESCRIPTION OF THE INVENTION
The invention relates to the hydrometallurgy of osmium, arsenic and rhenium, in particular to the methods for processing wash sulfuric acid used in the wet gas scrubbing system for copper and nickel industries, and can be used in the extraction of osmium, rhenium and arsenic from acidic solutions.
A method is known for extracting arsenic and osmium from wash sulfuric acid, according to which hydrogen peroxide is added to the washing acid, the osmium is removed by distillation as a tetroxide when the solution is heated to 90-95 ° C, and arsenic is precipitated by subsequent complete neutralization of the solution Lime milk [1]
Disadvantages of this method are high energy consumption for heating the washing acid and the formation, as a result of its neutralization, of large amounts of calcium sulphate, which, due to the high content of arsenic, is subject to disposal.
The method of extracting extraction of rhenium and osmium with a mixture of tertiary amines of the C 8 -C 10 fraction, using as a reextractant a solution of ammonium salts in ammonia, is closest to the expected in terms of the technical essence and the result achieved.
The disadvantage of this method is the low degree of recovery of osmium when used for the processing of washing sulfuric acid. In addition, the use of the method does not allow purification of solutions of washing sulfuric acid from arsenic.
The object of the invention is to recover the osmium and arsenic from the wash acid while extracting the rhenium by extraction with tertiary amines with re-extraction with solutions of ammonium hydroxide.
This is achieved by oxidizing the components before extraction to achieve the oxidation-reduction potential of the 900-1200 mV system, then adding the initial wash acid or ferrous sulfate solution, sodium sulfate or formaldehyde to the oxidation-reduction potential of 750-820 mV .
Reaching the oxidation-reduction potential of 900-1200 mV ensures complete oxidation of the extracted components. As the oxidant, chlorine gas can be used.
To remove excess oxidant, the redox potential is corrected by adding the initial wash acid to a value of 750-820 mV. The amount of acid added is 2-4% of the volume of the oxidized solution. To correct the potential, solutions of formaldehyde, sodium sulfate, iron (II) sulphate can be used.
After oxidation and correction of the oxidation-reduction potential of washing sulfuric acid, osmium and arsenic are in the optimum chemical state for their co-extraction with rhenium by the method of liquid extraction by tertiary amines, followed by reextraction with solutions of ammonium hydroxide.
The recovered components of osmium, arsenic and rhenium are concentrated in a reextract, the processing of which is carried out by known methods.
Example 1 . After 500 ml of a wash acid solution with an osmium content of 7.7 mg / L and arsenic 3.4 g / L, chlorine is bubbled in by monitoring the redox potential with a platinum electrode. Chlorination is terminated at a potential of 1200 mV. 12 ml of the initial wash acid are added to the solution, with the equilibrium value of the oxidation-reduction potential of the system reaching 820 mV. From the resulting osmium solution, arsenic is extracted by extraction with a 0.1 M solution of tri-n-octylamine in decane. The reextraction is carried out with 8% ammonium hydroxide solution. The extraction of osmium, arsenic and rhenium was 64, respectively; 32 and 99% In the comparative experiment without oxidation of the components, the recovery rate was 26% for osmium, 16% for arsenic and 98% for rhenium.
The implementation of this method makes it possible to increase the recovery of valuable components and to purify washing sulfuric acid from an environmentally hazardous arsenic pollutant.
CLAIM
1. A method for extracting rhenium, osmium, and arsenic from a redox-containing ruminal sulfuric acid, comprising extracting them with tertiary amines and stripping with ammonium hydroxide solutions, characterized in that before the extraction, the components are oxidized to achieve a redox potential of 900 to 1200 mV, then either the original Washing acid, or iron (II) sulfate solution, or a solution of sodium sulfite, or formaldehyde, until an oxidation-reduction potential of 750-820 mV is reached.
2. A process according to claim 1, characterized in that chlorine gas is used as the oxidizing agent.
print version
Date of publication 14.03.2007gg
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