SU371170A1 - METHOD OF EXTRACTION EXTRACTION HEAVY - Google Patents

Description

one

The invention relates to methods of extraction extraction from solutions and can be used for both preparative and analytical purposes.

The known method of extraction is extraction of heavy metals from aqueous solutions using an extractant from the group of pyridium derivatives and an organic solvent.

However, with the known method there is relatively dust solubility of the extractant in solutions of mineral acids and, as a consequence, large losses of the extractant 1U, extraction time, as well as low metal recovery.

In order to increase the degree of extraction, as well as reduce the loss of the extractant, it is proposed to use one of the amia derivatives of alkylpyridinium, for example, 2-amipo-1-laurylpyridiniumchloride or 4-amino-1-1-1Nylpyridinium chloride as extractant.

These compounds are characterized by low solubility in solutions of mineral acids, especially in hydrochloric acid solutions, which ensures a high percentage of metal recovery during extraction.

Example 1. Extraction of vantage vanadium.

1 ml of a solution of NH4VO3 with a concentration of 1 mg / ml V is placed in a separatory funnel, 3 MA distantly added; It is water, 1 ml (1 mol) of a solution of sodium chloride and one-half of Kylie (1 mol) of a solution of hydrochloric acid. Add 5 L1L (0.05 mol) solution

extractant in chloroform and shake for 2 Mi.H. After separation, the organic layer is separated and treated with 5 ml (5 mol) of the NCU3 solution for 2 minutes. The nitric acid solution is collected in a 100 ml volumetric flask.

An aliquot of 5 ml was placed in a 50 ml measuring flask, 5 ml of acetate buffer (pH 4.5), 5 ml (0.001 mol) of xylenol orange solution was added and the optical density of the solution was measured on FEC-56-2. Content

Vanadi are on a calibration schedule. With a single extraction, the recovery rate of vanadium with 2-amino-lauryl pyridinium chloride (pH 4.5-7.5) is 60%, and with 4-amino-1-lauryl pyridinium chloride (pH 5-8) 80%.

Example 2. Removing ferric iron.

In a separatory funnel, ienmenlaut 1 ml of a solution of ferric chloride (2 mg / ml), 3 ml

12 N hydrochloric acid, 1 ml (I mol) of sodium chloride solution. 5 ml (0.05 mol) of chloroform extractant solution are added and shaken for 2 minutes. After separation, the organic layer is separated and treated

5 M.j (1 .zhol) hydrochloric acid solution. After Stripping, the aqueous phase is collected in a 200 ml volumetric flask, made up to the mark with distilled water and stirred. An aliquot of 5 ml is placed in a 50 ml volumetric flask, 1 ml of a 25% aqueous solution of hydrochloric acid, 2 ml of a 10% aqueous solution of sulfosalicylic acid and 5 ml of a 25% aqueous solution are added, made up to the mark with distilled water, stirred and the optical density of the solution was measured at FEC-56-2. The iron content is found on a calibration graph.

With a single extraction, the degree of iron extraction with 4-amino-1-lauryl pyridinium chloride is 95%.

Subject invention

A method for the extraction of heavy metals, such as vanadium, cobalt, from aqueous solutions using an extractant from the group of pyridinium derivatives and an organic solvent, characterized in that, in order to increase the recovery rate and also to reduce the loss of the extractant, one of the amino derivatives is taken alkylpyridinium, for example, 2-amino-1-laurylpyridinium chloride or 4-amino-1-nonylpyridinium chloride.