RU2514242C1 - Sorption extraction of cobalt ions from acidic chloride solutions - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to sorption extraction of cobalt ions Co²⁺ from acidic chloride solutions and can be used in non-ferrous and ferrous metallurgy, as well as in treatment of industrial and household wastes. Co²⁺ ions are sorbed from chloride solutions containing ammonium chloride or alkali or alkali-earth metal chlorides on anionites selected from: AMP, containing exchange groups

or AM-2b, containing exchange groups

wherein the technical result is finding optimum conditions for sorption of cobalt ions on anionites.

EFFECT: high efficiency.

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Description

Sorption extraction of cobalt ions from acid chloride solutions belongs to the field of extraction of substances using sorbents and can be used in non-ferrous and ferrous metallurgy, as well as for the treatment of industrial and domestic wastewater.

It is known the use of cation exchangers and anion exchangers in hydrometallurgy for cleaning solutions of cations and metal anions, respectively [G.M. Voldman, A.N. Zelikman. Theory of hydrometallurgical processes. M .: Metallurgy. 1993. S.263-267].

However, the use of anion exchangers for the extraction of metal cations is not sufficiently studied and is of interest for finding additional possibilities for the selective extraction of metal ions from solutions of complex composition.

The closest technical solution is the extraction of cobalt ions from hydrochloric acid solutions by sorption on strongly basic anion-exchange resins [R. Ripan, I. Chetyanu. Inorganic chemistry, v.2. Chemistry of metals. Because of the "World", M., 1972. S. 545].

The disadvantage of this method is that specific conditions of sorption are not indicated, as well as the possibility of using other anion exchangers for sorption of cobalt ions.

The problem to which the claimed invention is directed is to find optimal conditions for the sorption of cobalt ions on anion exchangers of the grades AM-2b and AMP.

The technical result that can be achieved by carrying out the invention is the effective sorption of cobalt ions on anion exchangers.

This technical result is achieved by the fact that the sorption extraction of cobalt ions from hydrochloric acid solutions includes contacting the solution with anion exchange resin, sorption of Co ^{2+ ions} at a temperature of 70-80 ° C from hydrochloric solutions saturated with ammonium chlorides, alkali and alkaline earth metals, on anion exchangers of grades

AMPs containing exchange groups

and AM-2b containing exchange groups

The essence of the method lies in the fact that Co ^{2+ ions} in hydrochloric acid solutions form stable anionic complexes of the type [CoCl] ^2- , which can be quantitatively retained on strongly basic anionic resins.

It is known that chloride hydrometallurgy is used in the leaching of polymetallic concentrates. The use of hydrochloric acid due to its increased ability to complexation is interesting in schemes involving sorption-extraction technology for the separation of metals.

Examples of specific performance of the method.

The possibilities of using anion exchangers of the AMP and AM-2b grades for the extraction of cobalt chloride anionic complexes from hydrochloric acid solutions are considered.

Mixed basic porous anion exchange resin AM-2b with spherical granules was obtained by amination of XMS styrene and DVB with a mixture of dimethyl and trimethylamines. Granule size 0.63-1.60 mm; specific volume of swollen resin 2.7-3.2 cm ³ / g; specific surface area 50-100 m ² / g; total pore volume 0.80-0.87 cm ³ / g, mechanical strength 98-99%; POE 3.3-3.7 mEq / g. Exchange groups:

Gel highly basic AMP anion exchange resin with spherical granules was obtained by amination of CMS styrene and 3.5-4.0% DVB pyridine. Granule size 0.63-1.60 mm; the specific volume of the swollen resin 2.7-2.9 cm ³ / g; mechanical strength 98-99%; POE 3.3-3.7 mEq / g. Exchange groups:

Sorption of cobalt ions was carried out at 70-80 ° C from solutions of ammonium chloride NH ₄ Cl, alkaline (NaCl, KCl) and alkaline earth (CaCl ₂ ) metals, acidified with HCl. The volume of the solution is 100 cm ³ , the mass of the dry sorbent is 1 g. The sorbent was previously kept in distilled water. Sorption time 30-60 minutes.

Figure 1-4 shows the results of sorption of cobalt ions on anion exchange resin brand AMP, which indicates the initial concentration of the metal ion, g / dm ³ , the normal concentration of hydrochloric acid, the molar concentration of chloride of salts, SOE, mg / g - the exchange capacity in equilibrium.

The graphs of figures 1-4 are given

a - the dependence of SOE on the normal concentration of HCl at a fixed concentration of CoCl ₂ , g / dm, and the molar concentration of chloride salts,

b - the dependence of SOE on the molar concentration of chloride of salts at a fixed concentration of CoCl ₂ , g / DM, and a normal concentration of HCl,

c is the dependence of SOE on the concentration of CoCl ₂ , g / dm ³ , at fixed molar concentrations of salt chlorides and normal concentration of HCl.

Example 1 (figure 1).

Sorption was carried out from hydrochloric acid solutions containing NH ₄ Cl.

From the data of figure 1 it follows that high rates of sorption of cobalt ions on anion exchange resin brand AMP from hydrochloric acid solutions of cobalt and ammonium chlorides were obtained. The maximum sorption parameters of SOE> 140 mg / g were obtained from 1N solutions. HCl and 3M NH ₄ Cl.

Example 2 (figure 2).

Sorption was carried out from hydrochloric acid solutions containing NaCl.

From the data of figure 2 it follows that high rates of sorption of cobalt ions on anion exchangers of the AMP brand from hydrochloric acid solutions of cobalt and sodium chlorides were obtained. The maximum sorption parameters of SOE = 140 mg / g were obtained from 2n solutions. HCl 60 g / dm ³ NaCl.

Example 3 (figure 3).

Sorption was carried out from hydrochloric acid solutions containing KCl.

From the data of figure 3 it follows that high rates of sorption of cobalt ions on anion exchange resin brand AMP from hydrochloric acid solutions of cobalt and potassium chlorides were obtained. The maximum sorption parameters of СОЕ = 120 mg / g were obtained from 1N solutions. HCl and 3M KCl.

Example 4 (figure 4).

Sorption was carried out from hydrochloric acid solutions containing CaCl ₂ .

From the data of figure 4 it follows that high rates of sorption of cobalt ions on anion exchangers of the AMP grade from hydrochloric acid solutions of cobalt and ammonium chlorides were obtained. The maximum sorption parameters of SOE> 150 mg / g were obtained from 3n solutions. HCl and 2M CaCl ₂ .

Example 5

Sorption was carried out from hydrochloric acid solutions on anion exchangers AM-2b.

The maximum sorption of cobalt ions was obtained under the following conditions:

- Solution: 10 g / dm Co, 2M NH ₄ Cl, 1N. HCl. The time to reach equilibrium is 30 minutes. Equilibrium concentration of 9.7 g / dm. SOY 28 mg / g.

- The solution contains 21 g / dm Co, NaCl 60 g / dm, 2n. Hcl. The time to reach equilibrium is 60 minutes. Equilibrium concentration of 7.95 g / l. SOE = 265 mg / g.

- Solution: 10.7 g / dm Co, 3M KCl, 1N. Hcl. The time to reach equilibrium is 30 minutes. Equilibrium concentration of 9.7 g / dm. SOYE 98 mg / g.

- Solution: 11.8 g / dm Co, 4M CaCl ₂ , 3N. Hcl. The time to reach equilibrium is 30 minutes. The equilibrium concentration of 9.97 g / DM ³ . SOY 184 mg / g.

- Solution: 10 g / dm Co, 2M NH ₄ Cl, 1N. HCl. The time to reach equilibrium is 30 minutes. Equilibrium concentration of 9.7 g / dm. SOY 28 mg / g.

Compared with the prototype, the possibilities of effective sorption of Co ^{2+ ions} from acid chloride solutions on anion exchangers of the AMP and AM-2b grades are shown.

Claims (1)

The method of sorption extraction of cobalt ions of Co ²⁺ from acid chloride solutions, comprising contacting the solution with anion exchange resin, characterized in that the sorption of Co ^{2+ ions is} carried out from hydrochloric acid solutions containing ammonium or alkali or alkaline earth metal chlorides on anion exchangers selected from the group of grades:
AMP containing exchange groups

or AM-2b containing exchange groups

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