Sorption method of purifying aqueous solutions of cobalt from manganese

 

The method of extraction of manganese ions from aqueous solutions of cobalt refers to the extraction of substances ion exchange materials and can be used in ferrous and nonferrous metallurgy, as well as for the treatment of industrial and domestic wastewater. The technical result of the invention is to increase the efficiency of the method with simultaneous efficiency and simplicity. The method of adsorption of manganese ions from solutions of salts of cobalt carry out their sorption of weakly acidic peroxide solutions at 4pH6 on the anion exchange resin brand S-2B in the form that contains the exchange group. -CH2-N(CH3)2, -CH2-N(CH3)3. table 2.

Sorption method of cleaning solutions of cobalt from manganese relates to the field of removing substances ion exchange materials and can be used in ferrous and nonferrous metallurgy, as well as for the treatment of industrial and domestic wastewater.

Known methods of purification of a solution of cobalt from manganese [Khudyakov, I. F., Klein, S. E. , N. Ageev. G. - M.: metallurgy, 1993, S. 166-167] the deposition of the last of the hot acidic solutions in the presence of oxidants.

The disadvantage is that along with Margiela on the anion exchange resin from acidic solutions or of a mixture of acids and alcohols, taken in a certain ratio [Lavrukhina A. K. and other Analytical chemistry of manganese. THE USSR ACADEMY OF SCIENCES. M.: Nauka, 1974, S. 138-141].

The disadvantage of the methods is the high consumption of reagents.

The objective of the invention is to create an efficient way to extract anions manganese from aqueous solutions of salts of cobalt.

The technical result that can be achieved by carrying out the invention, lies in the high degree of efficiency of extraction of anions manganese from aqueous solutions of salts of cobalt with simultaneous efficiency and simplicity of the process.

This technical result is achieved in that in the method of extraction of manganese ions from solutions of cobalt salts, including sorption of manganese ions by contact of the solution and the sorbent and mixing, before sorption in the original solution is injected hydrogen peroxide, and sorption is carried out at 4pH6 on the anion exchange resin brand S-2B in the form that contains the exchange group-CH2N(CH3)2-CH2N(CH3)3The essence of the method is illustrated in the data table, which shows the time of sorption, min, at a given pH of solution, initial solution concentration, mg/DM3and residual kasowanie sediment in some experiments.

The sorption characteristics were evaluated also by the amount of SOY - exchange sorption capacity, mg/g, calculated as the mass of ions MP in grams absorbed by 1 gram of sorbent.

Sorption MP (VI) was obtained from 200 cm3initial solution, the weight of 2 sorbent, the Sorbent previously in the day was kept at 0.1 N. NaOH solution.

The concentration of manganese ions was determined on the photocolorimeter brand KFK-3, and acid-base characteristics of the solution was controlled by a pH-meter pH-121.

In the process of adsorption, the pH of the solution was changed, so in the process of sorption corrected set value of pH with continuous stirring.

Stirring and maintaining the set value of pH was carried out up until further acid-base characteristics of the system were changed slightly. However, for greater assurance of achieving equilibrium contact of the sorbent and solution carried out not less than one day. To maintain a given pH value of the solution in the process of sorption as a neutralizer solution was used H2SO4. Set the pH value was maintained for 1.5 hours from the beginning of the sorption neutralization solution, in the future, the pH value was changed insignificant is the temperature.

Using the values of the concentrations of manganese ions in aqueous solution source and after sorption was calculated SOY, mg/,

The original solution contained (g/DM3: 30,0 Co (II), 1.5 mn (II).

Additionally, to improve selective adsorption on anion exchange resin S-2B was carried out by oxidation of ions MP (II) to translate it into anions with higher oxidation number. With this purpose, as the oxidant used hydrogen peroxide, which is added to a solution of sulfate in a molar ratio of H2O2:Mn =2:1.

An example of practical application (see tab.1 in the end of the description).

From table 1 it follows that the results of sorption time-dependent and pH of the solution. The best results sorption obtained under the following conditions (see tab.2 at the end of the description).

The value of SOYBEANS=55-50 mg/g is stably retains its value when the contact of the solution with the precipitate for at least two days at pH of 5.5. At pH= 4.0 to 4.5 best performance obtained through the day sorption. When set to pH= 5.0 with increasing time of sorption value of SOYBEANS falls. Sorption of cobalt insignificant. Sorption of manganese ions is degraded at pH>6 and pH<4.

Found that pre-treatment sorbent 0.1 N. a solution of H2SO4or distilled water affects the sorption characteristics, preliminary alkaline treatment of the sorbent improves the sorption probably because in alkaline hydrogen peroxide activates the oxidation of manganese ions to ions of different valency, which promotes sorption of manganese on the anion exchange resin.

The anion sorption by manganese can be used for extraction of manganese from solutions, including those containing cations of the metals copper, Nickel, cobalt and others, as well as for wastewater treatment of manganese ions.

Compared with the prototype using adsorption on anion exchange resin S-2B is an effective way of extracting manganese from aqueous solutions of cobalt sulfate.

Claims

The method of extraction of manganese ions from solutions of cobalt salts, including sorption of manganese ions by contact of the solution and the sorbent and mixing, characterized in that prior to sorption in the original solution is injected hydrogen peroxide, and sorption is carried out at 4R is )2, -CH2-N(CH3)3.

 

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