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INVENTION
Patent of the Russian Federation RU2048563
METHOD OF CONCENTRATION OF INDIA FROM SULPHATE ZINC SOLUTIONS
The name of the inventor:
The name of the patent holder: Chelyabinsk electrolytic zinc plant
Address for correspondence:
Date of commencement of the patent: 1993.05.25
The invention relates to the technology of rare and dispersed elements and can be used to extract indium from sulphate zinc solutions by extraction of DI-2-ethylhexylphosphoric acid and re-extraction of the metal with a solution of sulfuric acid. SUMMARY OF THE INVENTION: Extraction and re-extraction products (circulating extractant and raffinate) beforehand for further processing are previously sent to the apparatus for centrifugal separation of the aqueous and organic phases.
DESCRIPTION OF THE INVENTION
The invention relates to the technology of rare and dispersed elements and can be used in the extraction of indium from sulfate zinc solutions.
There are known methods for extracting indium by extractants of various compositions, including di-2-ethylhexylphosphoric acid (D2EHPK) in various organic solvents and stripping the indium from the organic phase with mixtures of acids containing hydrochloric acid or with only one hydrochloric acid [1] (Bul. Non-ferrous metallurgy, 1963, No. 19, pp. 29-33, 1965, No. 20, pp. 48-49).
A disadvantage of these methods is the large volume of hydrochloric acid used at the stage of stripping, which increases the concentration of chlorine ions in the raffinate and, therefore, causes the complexity in the further utilization of zinc chlorides.
A method for concentrating indium from sulfate zinc solutions is known, which includes extracting the metal with an organic phase containing D2EHPK, other components and a diluent, and re-extraction of indium with a solution of sulfuric and phosphoric acid (aut.s., N 1625024, class C 22 B 58/00).
A disadvantage of this invention is the use, as a diluent, of kerosene having a low flash point, which greatly increases the capital costs for ensuring the fire safety of the technology.
The closest to the technical essence and achieved result to the invention is the method of indium concentration selected by the prototype, comprising the steps of extraction in the presence of D2EHPK and synthetic fatty acid diluent (FFA), and re-extraction of indium with sulfuric acid with a dosage of phosphoric acid [2]
A disadvantage of this method is the production of raffinate with a high content of organic substances and the formation in the process of difficultly dissolving emulsions.
The object of the invention is to reduce the content of organic substances in the raffinate, to eliminate the formation of difficultly dissolving emulsions.
This is achieved by the fact that in a process involving the steps of extracting indium in the presence of di-2-ethylhexylphosphoric acid and other components in a synthetic fatty acid diluent (SFA) and re-extracting the metal with sulfuric acid with the addition of chlorine ions, returning the recycled extractant to the extraction step, Raffinate and directing it to getite deposition, according to the invention, the reverse extractant and raffinate are preliminarily sent to the apparatus for centrifugal separation of the aqueous and organic phases.
Another difference is that the apparatus uses a centrifugal extractor with a rotor speed of 20 to 40 m / s.
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When searching the sources of scientific, technical and patent information, no solutions were found in which the following features were used: before the turnaround extractant was supplied to the extraction stage and the raffinate for getite deposition, the said products of the extraction technology, the circulating extractant and raffinate, are preliminarily sent to the apparatus for centrifugal separation of the water and The organic phase at a rotational speed of the apparatus shaft is from 20 to 40 m / s. The drawing shows an apparatus-technological scheme of the method implementation. |
THE METHOD IS PROVIDED AS FOLLOWS:
A stock solution 17 of the following composition, g / l: indium 0.3-1.5; Zinc 80-120; Iron 10-20; Copper 3-8, was fed through the dispenser 5 to the extractor 1 for extraction of indium. A starting extractant comprising a mixture of 13: 0.7 M D2 EGFK (TU-06-0.2-1047-78), 0-0.2 M TAA (trialkylamine) (TY-002B-79 LU) and as a synthetic solvent Fatty acid with a fraction of C 7 -C 9 (GOST 23239-78) was fed to the extractor through a collection container 4 of a reversible extractant and a dispenser 3. The ratio of the aqueous phase and the organic ratio was 3: 1. The extrusion of indium was carried out in the extractor 2 with a solution of the composition, g / l: H 2 SO 4 400 and NaCl 25, which was fed to the extractor 2 through a weigher of the stripping agent 6. The ratio of the organic phase to the aqueous phase was 5: 1. The resulting re-extract 8 with an indium content of 30-40 g / l was fed to further processing by sulphide purification, cementation, etc. The circulating extractant 7 was directed to the centrifugal extractor 10, while the light organic fraction 14 was sent to the collector 4, and the heavy fraction 9 was combined with the reextract. The raffinate 15 obtained after the extraction step was directed to a centrifugal extractor 16. After this, the light fraction (organic) 11 was returned to extraction, and the heavy fraction 12 was returned to getite precipitation.
The limits of the rotational speed of the centrifugal extractor shaft of different brands (EC 33, EC 250, EC 320), which were 20-40 m / s (table), are experimentally established. At a rotational speed below 20, the organic matter in the raffinate is significantly increased to 0.75 g / l. At a speed of rotation above 40 m / s, the organic matter content is not reduced, and the energy consumption for the operation of the centrifugal extractor is increased. If one of the centrifugal extractors is excluded from the scheme, the necessary indices for the content of organic substances in the raffinate are not achieved, and hard-dispersible emulsions are formed.
The use of a centrifugal separation apparatus allows, in comparison with other known methods, to separate the emulsions into two constituents, the organic and the inorganic phase, and thereby eliminate their formation.
Tests carried out at the Chelyabinsk Electrolytic Zinc Plant showed the possibility of reducing the organic content in the raffinate compared to the prototype 60-65 times.
CLAIM
1. A METHOD OF CONCENTRATION OF INDIA FROM SULPHATE ZINC SOLUTIONS, comprising extracting indium with an extractant containing di-2-ethylhexylphosphoric acid in a diluent of synthetic fatty acids and reextraction of the metal with a solution of sulfuric acid, returning the recycled extractant to the extraction stage, obtaining raffinate and directing it to the ghetto Precipitation, characterized in that the reextraction is carried out with a solution of sulfuric acid with the addition of sodium chloride, before returning the circulating extractant and before precipitation the raffinate is sent to the apparatus for centrifugal separation of the aqueous and organic phases.
2. The method of claim 1, wherein the phase separation uses a centrifugal extractor at a rotational speed of its rotor of 20-40 m / s.
print version
Date of publication 15.03.2007гг
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