The method of concentration of indium from zinc sulfate solutions

 

The invention relates to the field of non-ferrous metallurgy, in particular to the technology of rare and scattered elements, and can be used for the recovery of indium from zinc sulfate solutions with a high content of silica. The invention allows to reduce the formation of hard stratifying emulsions to increase the recovery of India in the extraction step. For this, the composition of the organic phase containing di-2-ethylhexylamine acid and synthetic fatty acid fraction7-C9additionally injected oil paraffin fraction13. table 1.

The invention relates to a technology of rare and scattered elements, and can be used for the recovery of indium from zinc sulfate solutions with a high silica content.

There is a method of concentrating India, including the stage of extraction of indium from zinc sulfate solutions of 0.3 N. the solution D2EGFK in kerosene (see kN. Metallurgy of rare metals. Authors: Zelikman A. N. etc., M. metallurgy, 1978, S. 466).

The disadvantage of this method is that the process is carried out using a solvent kerosene with a low flash point, which requires additional CA is of India, including the stage of extraction of indium from zinc sulfate solutions of organic phase composition: D2EGFK (di-2-ethylhexylphthalate acid) - 0.7 M (18,5%) TAA (trialkylamine) - 0.2 M (4,4%) The solvent (synthetic fatty acid (FFA) fraction7-C9(GOST 23239-78)) - 77,1% vol. (see non-ferrous metals, 1992, 2, S. 44-45).

The disadvantage of this method is that the composition of the organic compounds include trialkylamine, which together with the organic phase part in the main hydrometallurgical cycle and has a negative impact on the performance of electrolysis of zinc.

The closest in technical essence and the achieved result is a method of concentration of indium from zinc sulfate solutions, including the stage of extraction of the organic phase of the composition: D2EGFK - 0.7 M (19,4%) FFA fraction7-C9- 80,6% vol. with the subsequent reextracting his solution of sulfuric acid with chloride-containing reagent (see patent 2048563. Published 20.11.95,, bull. 32 CL 22 In 58/00).

The disadvantage of this method is the high viscosity (above 12-15 mm2/s) and density (above 0,92-0,94 g/cm3) the organic phase, which complicates the processing solutions with a high content of gel tremoctopus to extraction) in connection with the intensive formation of hard stratifying emulsions.

The technical result of the present invention is to reduce the formation of hard stratifying emulsions during processing solutions with a high content of silica gel, reducing the loss of India with the raffinate and emulsions and thereby increase its extraction in the extraction step. This result is achieved in that in the method the concentration of indium from zinc sulfate solutions, including phase extraction India organic phase containing di-2-ethylhexylamine acid (D2EGFK) in diluent - synthetic fatty acid (FFA) fraction7-C9and the next stage of Stripping India sulfuric acid solution with chloride-containing reagent, the organic phase is supplied to the extraction, impose additional oil paraffin fraction13when the following ratio of components,% vol.: Di-2-ethylhexylphthalate acid - 15-20 Synthetic fatty acid fraction7-C9- 35-40
Oil paraffin fraction13- 40-50
The method is as follows.

Source zinc sulfate solution undergoes the process of reduction of iron, then the slurry is filtered in filter presses and the filtered solution composition, g/l: zinc 80-120, indium 0,2-1, is the use of the organic phase, including D2EGFK (TU - 06-02-1047-78), FFA fraction7-C9(GOST 23239-78) and paraffin oil fraction With13(THE 0255-042-04689375-95) in ratios of, respectively, about.%: (15-20), (35-40) and (40-50). The ratio of aqueous and organic phase in the extraction step 3:1. Reextraction India carried out by the solution composition, g/l: 400 H2SO4and 25 NaCl. The ratio of organic and aqueous phase at the stage of Stripping is 5: 1. The resulting reextract with indium content of 30-40 g/l are sent to the next stage of cleaning, grouting, etc.

The proposed method is tested in industrial conditions.

Tests showed that the extraction of indium from zinc sulfate solutions with a high content of silicic acid gel organic phase of the composition, about. %: D2EGFK 15-20, FLC 35-40, paraffin oil 40-50, can virtually eliminate the formation of hard stratifying emulsions, to reduce the loss of India emulsions and raffinate, which increases its extraction in the extraction step. The limits of variation of the components in the organic phase associated with its extraction capacity and viscosity. So, if you increase the number of FFA over 40% increases the viscosity of the organic phase is higher than the optimal (6-9 mm2/s) and increases education>and /or impairs the separation of the phases and increases the loss of India with the raffinate. By reducing the number D2EGFK below 15% increase loss India with raffinate and decreases the performance of the installation. When the content D2EGFK more than 20% of the performance of extraction India does not increase, but increase the cost of expensive extractant. Thus, only in the proposed ratio of components in the organic phase reaches its maximum effect at the stage of extraction of indium from zinc sulfate solutions with a high content of silicic acid gel.

Validation of the method was carried out as follows.

Sulphate of zinc solution with a high silica content of the composition, g/l: zinc - 105, indium - 55, silica - 0,4, filed on stage extraction with an organic phase composition, vol.%: D2EGFK 15-20, FLC 35-40, paraffin oil 40-50. The viscosity of the organic mixture was 7.5 mm2/s capacity of the plant for zinc solution was 5 m3/h, and the ratio of aqueous and organic phases in the extraction step was 3:1.

In similar conditions was tested by the known method.

The table below shows comparative data verification of known and proposed methods of the end of the proposed method in the extraction of zinc sulfate solutions with a high silica content, practically eliminated the formation of hard stratifying emulsions, reduces the loss of India with the raffinate and emulsions, which increases the extraction of India in the extraction step by 3.6%.


Claims

The method of concentration of indium from zinc sulfate solutions, including phase extraction India organic phase containing di-2-ethylhexylamine acid in the diluent is a synthetic fatty acid fraction7-C9and the next stage of Stripping India sulfuric acid solution with chloride-containing reagent, wherein the organic phase contains oil paraffin fraction13in the following ratio of components,%:

Di-2-ethylhexylphthalate acid 15 - 20

Synthetic fatty acid

fractions With7-C935 - 40

Oil paraffin fraction1340 - 50

 

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EFFECT: improved separating method.

5 tbl, 5 ex

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