The method of extraction of zinc ions from aqueous solutions

 

(57) Abstract:

The invention relates to the extraction of substances organic extractants from aqueous solutions and can be used in ferrous and nonferrous metallurgy, as well as for the treatment of industrial and domestic wastewater. In the extraction of zinc ions from aqueous solutions as a solvent a mixture of oleic acid and triethanolamine, and the extraction is carried out at a pH of 3-11, provided the efficiency of the method through the use of inexpensive and effective extractant. 3 table.

The invention relates to the extraction of substances organic extractants from aqueous solutions and can be used in ferrous and nonferrous metallurgy, as well as for the treatment of industrial and domestic wastewater.

A method of refining zinc concentrates [Rian R., Cetanu I. Inorganic chemistry. - M.: Mir, 1972, S. 786 and 787] pyrometallurgical route.

The drawbacks of this method is a multi-stage process, the use of sophisticated equipment and the risk of environmental pollution.

The closest technical solution is electroextraction zinc ions [Rian R., Cetanu I. Inorganic chemistry. - M.: Mir, 1972 the Oia zinc ions, for example, sorption to extract zinc ions from solution after electroextraction to norms.

The objective of the invention is the use of efficient and effective method for the extraction of zinc ions from aqueous solutions.

The technical result that can be obtained by use of the invention is economical and efficient recovery of zinc ions from aqueous solutions.

This technical result is achieved by the fact that in the known method of extraction of zinc ions as the extractant used a mixture of oleic acid and triethanolamine, and the extraction is carried out at pH 3-11.

The essence of the method is illustrated in the data table. 1-3, which include the contact time of the phases at a given pH, concentration of metal ions and pH in the clarified aqueous phase, the distribution coefficient D calculated as the ratio of the equilibrium concentrations of metal ion in the organic and aqueous phases.

The extractant was added to the original solution of zinc sulfate volume 190 cm3at 10 cm3(the ratio of organic and aqueous phase a:=1:19). Stirring and maintaining the set value of pH was carried out up until in zavodney, in the latter determined the pH and the residual concentration of metal. To maintain a given pH value of the solution in the extraction process metal as neutralizers used solutions of alkali NaOH and acid (H2SO4.

Using the values of the concentrations of zinc ions in aqueous solution source and, after extraction, was calculated distribution coefficient of the metal D between the organic and aqueous phases.

Examples of practical application.

As extractant used a mixture of triethanolamine, oleic acid and diluent which are mixed in a volume ratio of 6:12:82.

Volumes of organic and aqueous phases are changed compared to the original slightly: the amount of organic is not changed, the water is in the range of 0.8-1.0.

Example 1 (table.1).

The diluent is kerosene.

Extraction of zinc is carried out at pH 4-10, the best results were obtained at pH 5-10: distribution coefficient D=21-51 at the time of extraction 10-20 minutes At pH>10 within days of the separation of aqueous and organic phase did not occur.

Example 2 (table.2).

The diluent - gas.

Extraction of zinc is carried out at pH 3-11, best resdoc.

Example 3 (table.3).

The diluent - engine oil.

Extraction of zinc is carried out at pH 7-10, the best results were obtained at pH 9-10: the distribution coefficient D=12-27 at the time of extraction 150 minutes At pH>10 falls flocculent precipitate.

The nature of the inert diluent affects the kinetics and distribution coefficients and separation of the extracted ion.

Inert diluent - engine oil increases the ignition temperature of the extractant, making the last fireproof, however, engine oil, being more viscous compared to, for example, gasoline and kerosene, lengthens the processes of mass transfer, separation and sludge phases.

Compared with the prototype of the proposed method is economical due to the use of inexpensive and effective extractant.

The method of extraction of zinc ions from aqueous solutions, characterized in that the extractant used a mixture of oleic acid and triethanolamine, and the extraction is carried out at pH 3-11.

 

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FIELD: nonferrous metallurgy; pyrometallurgy.

SUBSTANCE: the invention presents a method of pyrometallurgical processing of zinc-containing materials and is dealt with nonferrous metallurgy, in particular, with processing of zinc cakes by a rotary-kiln processing. The method of pyrometallurgical processing of zinc-containing materials provides for production of a mixture from zinc-containing material and a solid carbonaceous reducing agent, the mixture agglomeration and a consequent rotary-kiln processing of the agglomerated mixture together with the solid carbonaceous reducing agent. The indicated mixture also contains fractions of crushed fossil rock in an amount of 2-10 % from the weight of a zinc-containing material. Agglomeration of the mixture is realized by its pressing, at that before the operation of mixing or simultaneously with it crushing of the zinc-containing material is realized providing an increase of the contents of zinc in the rotary-kiln oxidation, decrease of the carbonaceous reducing agent consumption and simplification of technology of the zinc-containing materials processing.

EFFECT: the invention ensures increased production of zinc in the rotary-kiln oxidation process, decreased consumption of the carbonaceous reducing agent, simplification of technology of the zinc-containing materials processing.

5 cl, 4 tbl, 4 ex

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