Selective extraction of (vi)

FIELD: extraction of agent by means of sorbents; ferrous and non-ferrous metallurgy; cleaning domestic and industrial drainage passages; processing wastes of non-ferrous metals containing (VI) tungsten.

SUBSTANCE: proposed method includes sorption of (VI) tungsten on macroporous anionite at correction of ph ≤ 5. Prior to sorption, anionite is treated with water, acid solution or alkali solution.

EFFECT: enhanced efficiency.

6 dwg, 6 tbl, 6 ex

 

Method for the selective extraction of tungsten (VI) from solutions of cations of heavy metals refers to the extraction of substances with the use of sorbents and can be used in ferrous and nonferrous metallurgy, as well as for the treatment of industrial and domestic wastewater and recycling of non-ferrous metals containing tungsten (VI).

It is known that aqueous solutions can be distinguished tungsten in scheelite, a tungsten acid or parabolicamara [Meyerson GA, Zelikman A.N. Metallurgy of rare metals. M: State. nauch.-technology. in the literature on black and printing. metallurgy. - 1955. - P.66-70].

The disadvantage is that along with tungsten deposited other insoluble impurities.

The method for extracting tungsten (VI) from solutions containing cations of heavy metals, including sorption of tungsten on the anion exchange resin [Ion exchangers in nonferrous metallurgy. Edited by Lebedev K.B. M.: metallurgy, 1975, SCR-197].

The disadvantage of this method is that the unknown optimal conditions for the extraction of tungsten (VI) on macroporous anion exchange resin brand S-2B of the solutions containing heavy metal cations.

Task to be solved by the claimed invention is directed, is finding an efficient method for the selective extraction of ions of tungsten (VI) from an aqueous solution of cations of heavy metals.

Technical is the result of Kim, which can be achieved by carrying out the invention, a high selectivity of the extraction of ions of tungsten (VI) from solutions of heavy metal cations with the simultaneous simplicity and reduction stages of obtaining pure tungsten and its compounds.

This technical result is achieved by the fact that in the known method of extracting tungsten (VI) from solutions of cations of heavy metals, including sorption of tungsten on the anion-exchange, sorption carried out on a macroporous anion exchange resin brand AM-2B for the correction of the setpoint pH≤5, because the adsorption of the anion exchange resin is treated with water, an acid solution or alkali solution.

The essence of the method is illustrated by drawings, where figure 1-5 are based residual concentration of tungsten (VI) on pH, time of adsorption and pre-processing of the sorbent, and figure 6 is given the option process flow diagram of the processing of the initial solution, and data tables 1-6, where there are residual concentration of heavy metal cations, as well as their degree of extraction from the solution.

Sorption of W (VI) was obtained from 200 cm3the original solution of Na2WO4and cation of heavy metal, the mass of the sorbent 2, Macroporous sorbent brand AM-2B containing exchange group-CH2-N(CH3)2, -CH2-N(CH3)3during the day derival in distilled water (figures 1 - figure 1-3), or in 0.1 N. NaOH solution (figures 2 - 1-3), or in 0.1 N. the solution of Hcl (graphs 3 2), or in 0.1 N. the solution of H2SO4(figures 3 figures 1, 3).

The concentration of tungsten 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 neutralizers used a solution of H2SO4or Hcl. Set the pH value was maintained for 5 hours from the beginning of the sorption neutralization solution, in the future, the pH value was changed slightly, so the adjustment of pH was carried out once a day.

Sorption was carried out at room temperature.

Using the values of the concentrations of tungsten ions in aqueous solution source and after sorption, the expected SOYBEAN, mg/g

Examples of specific implementation method.

PR is measures 1 (1, table.1)

Figure 1 gives the results of the extraction of tungsten (VI) from solution CoSO4the sorption at pH 1, the neutralizer N2SO4.

The original solution contained (g/DM3: 14,3, 6,1 WO3.

The best extraction two days sorption obtained by alkaline treatment of the sorbent (SOY=600 mg/g extract 98,4%).

In table 1 is given to the extraction of Co (II) in the solution after three days of contact solution and sorbent.

Table 1
Pre-treatment sorbentThe concentration of Co (II), g/DM3Extract, % mass. from source
sourceresidual
H2About

NaOH

H2SO4
14,3

14,3

14,3
12,4

13,6

13,9
13,3

4,9

2,8

Example 2 (figure 2, table 2)

Figure 2 gives the results of the extraction of tungsten (VI) from solution CoSO4the sorption at pH 5 and water and alkaline treatments of the sorbent, as well as at pH 2.3 and acidic treatment of the sorbent, catalyst H2SO4.

The original solution contained (g/DM3: 14,3, 2,3 WO3.

The best extraction two days sorption obtained by alkaline treatment of the sorbent (SOY=191 WO3 mg/g extract 95,1%).

When the water treatment of the sorbent after 2 h sorption precipitate appeared, but when the alkaline processing precipitate was formed through the day.

In table 2 is given to the extraction of Co (II) in solution after two days of contact solution and sorbent.

Table 2
Pre-treatment sorbentthe pH of the sorptionThe concentration of Co (II), g/DM3Extract, % mass. from source
sourceresidual
H2About

NaOH

H2SO4
5

5

2,3
14,3

14,3

14,3
7.2V

7.2V

7,9
49,7

49,7

37,0

Example 3 (table 3).

In the original solution of Co (II) was injected sorbent, and then gradually added a solution of W(VI) with simultaneous correction of the pH of the following values depending on the processing sorbent:

Handling sorbent pH

H2About 4,7-5,6

NaOH of 4.0 to 5.7

H2SO4the 4.9 to 5.3

The original solution contained (g/DM: 13,8 Co (II) and 2.0 WO3. When all the processing methods sorbent sorption of tungsten (VI) was fully completed within 1 h, SOY=200 mg/g WO3.

In table 3 is given to the extraction of Co (II) in solution after one day to the quantum solution and sorbent.

Table 3
Pre-treatment sorbentThe concentration of Co (II), g/DM3Extract, % mass. from source
sourceresidual
H2O

NaOH

H2SO4
13,8

13,8

13,8
8,1

7,7

7,0
41,3

44,2

to 49.3

Example 4 (figure 3, table 4)

Figure 3 gives the results of the extraction of tungsten (VI) from solution NiCl2the sorption at pH 1, the Converter Hcl.

The original solution contained (g/DM3: 11,9 Ni, 6,1 WO3.

The best indicators of the extract obtained by water treatment of the sorbent after 6 hours of sorption (SOY=605 mg/g extract 99,2%).

In table 4 is given to the extraction of Ni (II) in solution after days of contact solution and sorbent.

Table 4
Pre-treatment sorbentThe concentration of Co (II), g/DM3Extract, % mass. from source
sourceresidual
H2About

NaOH

HCl
11,9

11,9

11,9
7,0

7,0

6,8
41,2

41,2

42,9

Example 5 (figure 4, table 5)

Figure 4 gives the results of the extraction of tungsten (VI) from solution NiCl2the sorption at pH 5, the neutralizer Hcl.

The original solution contained (g/DM3: 12,4 Ni, 2,0 WO3.

The best performance of extraction after 5 hours of adsorption obtained by acid treatment of the sorbent (SOY=197 WO3mg/g extract 98,4%).

In table 5 is given to the extraction of Ni (II) in solution after days of contact solution and sorbent.

Table 5
Pre-treatment sorbentThe concentration of Ni (II), g/DM3Extract, % mass. from source
sourceresidual
H2About

NaOH

H2SO4
12,4

12,4

12,4
7,8

7,8

9,5
37,1

37,1

23,4

Example 6 (figure 5, table 6)

The original solution contained (g/DM3: 14,3 MP (II) and 6.1 WO3.

Figure 5 gives the results of the extraction of tungsten (VI) from solution MnSO4the sorption at pH 1, the Converter H2SO4.

The best performance of extraction after 2 hours of adsorption obtained by aqueous processing of sorbent (SOY=599 mg/g extract of 98.2%).

In table 6 is given to removing MP (II) in solution on the Les two days of contact solution and sorbent.

Table 6
Pre-treatment sorbentThe concentration of MP (II), g/DM3Extract, % mass. from source
sourceresidual
H2O

NaOH

HCl
14,3

14,3

14,3
12,5

8,3

12,3
12,6

42,0

14,0

After sorption of W (VI) Me (II) (Me=Co, Ni, Mn) can be isolated from solution by sorption, hydrolytic precipitation, electrolysis and other methods.

Figure 6 is given the option process flow diagram of the processing of the initial solution.

Compared with the prototype of the proposed method provides a high selectivity of the extraction of ions of tungsten (VI) from solutions of heavy metal cations with the simultaneous simplicity and reduction stages of obtaining pure tungsten and its compounds.

The method of extracting tungsten (VI) from solutions containing cations of heavy metals, including sorption of tungsten on the anion exchange resin, characterized in that the sorption carried out on a macroporous anion exchange resin brand AM-2B for the correction of the setpoint pH≤5, because the adsorption of the anion exchange resin is treated with water, an acid solution or alkali solution.



 

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