The method of extraction of indium from zinc sulfate solutions

 

(57) Abstract:

The invention relates to hydrometallurgy of rare and trace elements and can be used for extraction of the extraction and concentration of indium from zinc sulfate solutions. The invention allows to increase the degree of extraction of indium from the aqueous phase and to simplify the technological process due to the use for Stripping India solutions of sulfuric acid without the addition of chloride ions. The method involves extraction using as a solvent a mixture of organophosphorus reagents in organic diluent and re-extraction solution of sulfuric acid. As organophosphorus reagents in the extraction of a mixture containing di-2-ethylhexylamine acid and ISO-dodecylphosphonic acid, in a ratio of components in the extractant, vol.%: di-2-ethylhexylphthalate acid 20-30, ISO-dodecylphosphonic acid 5-10, organic diluent else, and extraly lead sulfuric acid solution with a concentration of 250-450 g/DM3. table 1.

The invention relates to the field of hydrometallurgy of rare and trace elements. It can be used for extraction extraction and kontsentrirovannoy processing of concentrates and intermediates lead-zinc production. Now to extract indium from technological solutions of zinc production is the extraction method, which allows a concentration of India and separation from most of the impurities. It is used as an individual extractants, and mixtures thereof.

The method for extracting indium from solutions of zinc production extraction solution 20-25% di-2-ethylhexylamine acid (D2EGFK) in kerosene (A. C. of the USSR №684908, CL 22 In 58/00, 1978).

The disadvantage of this method is the use for Stripping India from the organic phase of hydrochloric acid solutions.

There is also known a method of extracting indium from zinc sulfate solution with an extractant containing a mixture D2EGFK and salts of Quaternary ammonium bases of methyltrioctylammonium in kerosene (A. C. of the USSR №1261300, CL 22 In 58/00, 1985).

The disadvantage of this method of extraction India is the low selectivity of the process for some impurities, such as antimony and arsenic, and the need to use for Stripping India a mixture of solutions of sulphuric and phosphoric acid of high concentration. In addition, due to the different solubility of the components of the mixture of organic reagents in water Rania India from acid sulfate solutions extractant, containing organophosphorus reagent soddell-tsvetanova acid (IDFC) dissolved in kerosene. For Stripping India from the organic phase using solutions 300-450 g/DM3sulfuric acid (Travkin C. F., Kubasov C. L., Kazakbaev L. A. and other // non-ferrous metallurgy. - 2001. No. 12. - S. 22-25).

The disadvantage of this method is the relatively low extraction India in the organic phase.

The closest to the proposed method to the technical essence and the achieved result is a method of extraction of indium from zinc sulfate solutions, including extraction, using as a solvent a mixture of organophosphorus reagents containing, for example, di-2-ethylhexylamine acid and phosphineoxide, and the re-extraction solution of sulfuric acid (see US 5344567 As, CL 01 D 15/04, publ. 06.09.1994, formula, columns 1, 2 C. 1, only 5 sheets).

The disadvantage of this method is the low extraction of indium from zinc sulfate solutions.

The technical result is to increase the degree total (for two stages of extraction and re-extraction) extraction India.

This technical result is achieved in that in the method of extracting from India Sul is organicheskikh reagents in an organic diluent and re-extraction solution of sulfuric acid, according to the invention by extraction using a mixture containing di-2-ethylhexylamine acid and ISO-dodecylphosphonic acid, in a ratio of components in the extractant,%:

di-2-Ethylhexylphthalate acid (D2EGFK) 20-30

ISO-Dodecylphosphonic acid (IDFC) 5-10

The organic diluent Else

and reextraction lead sulfuric acid solution with a concentration of 250-450 g/DM3.

The method is as follows.

Source zinc sulfate solution composition, g/DM3: zinc 80-120; indium 0,2-1,2; iron (+3) is less than 0.1, the total iron 10-20; copper 2-10 comes to extraction. Extraction takes place with the use of organic phase composition, vol.%:

D2EGFK 20-30

IDFC 5-10

The organic diluent

(FFA fraction7-C9or

kerosene) Else

The ratio of aqueous and organic phases 2-3:1. Reextraction spend solution 250-450 g/DM3sulphuric acid.

The proposed method is tested in laboratory conditions.

Tests have shown that carrying out the extraction India organic phase composition, vol.%:

D2EGFK 20-30

IDFC 5-10

The organic diluent Else

The limits of variation of the components of the organic phase in the extraction step is defined experimental data when verifying method of extraction of indium from zinc sulfate solutions.

So, when the content D2EGFK in organic compounds less than 20% decreases removing India in the extraction step. When the content IDFC less than 5% reduced extraction of indium on stage Stripping operation, it is a solution of sulfuric acid without the addition of the chloride ion. With the increasing content D2EGFK more than 30% and IDFC more than 10% slow delamination of organic and aqueous phase.

Upon decrease of the concentration of sulfuric acid of less than 250 g/DM3reextracted India is deteriorating, while increasing the acidity of more than 450 g/DM3reextracted India does not increase, and increase production costs.

Thus, only when carrying out the extraction of indium mixture of organophosphorus reagents in a ratio of components,%:

D2EGFK 20-30

IDFC 5-10

The organic diluent Else

and the Stripping solution of sulfuric acid with a concentration of 250-450 g/DM3achieved net effect of increasing the recovery and is 2">Example.

Source zinc sulfate solution of the following composition, g/l: indium 0.3 to 1.5, zinc 80-120, iron total 10-20, copper 3-10 filed at the stage of extraction. As extragent used a mixture D2EGFK and ISO-dodecylphosphonic acid and the mixture D2EGFK with phosphine oxide (prototype) in a solution of an organic solvent synthetic fatty acids.

The ratio of organic and aqueous phase in the extraction step was 1:2. The number D2EGFK was 25 vol.%, IDFK of 7.5 vol.%, phosphine oxide of 7.5 vol.%, The FLC else. Obtained after the extraction step rich indium organic phase was entered on the stage of Stripping. Reextracted passed with a ratio a:b=10:1. As restraint used a sulfuric acid solution with a concentration of 350 g/DM3.

The table shows the options of ways to extract indium from zinc sulfate solutions. As can be seen from the table, when using the proposed method improves the retrieval India both at the stage of extraction and Stripping, and the total extraction increases by 2.6%.

The method of extraction of indium from zinc sulfate solutions, including extraction using as ek is lots characterized in that as organophosphorus reagents in the extraction of a mixture containing di-2-ethylhexylamine acid and ISO-dodecylphosphonic acid, in a ratio of components in the extractant,%:

Di-2-ethylhexylphthalate acid 20-30

ISO-dodecylphosphonic acid 5-10

The organic diluent Else

and extraly lead sulfuric acid solution with a concentration of 250-450 g/DM3.

 

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FIELD: chemistry.

SUBSTANCE: extractant has bi-phosphorus acid and additionally has tri-phosphate with relation of said components (0,5-1,25):1. Method for producing extractant includes adding to 2-ethylhexanole of chlorine oxide of phosphorus with their relation (4,5-5,1):2,0, and with parameters determined by reaching fullness of passing of reaction, after that reaction mixture is exposed until full removal of formed chlorine hydrogen, then to received mixture 1 mole of water is added, mixture is exposed to full hydrolysis. Then mixture is washed ad water layer is separated from organic remainder, containing said bi-phosphoric acid and tri-phosphate.

EFFECT: higher efficiency.

2 cl, 1 dwg, 2 tbl, 4 ex

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