Selective recovery of molybdenum(vi)

FIELD: hydrometallurgy.

SUBSTANCE: invention relates to sorption-mediated recovery of molybdenum from solutions containing heavy metal cations. Method of invention comprises providing solution to be treated, sorption of molybdenum(VI) on anionite at pH < 7. Sorption is conducted from solutions with anionites AM-2b and AMP at solution pH below pH of hydrolytic precipitation of heavy metal cations but higher than pH of formation of molybdenum cations (pH ~ 1).

EFFECT: increased process selectivity and reduced number of stages in preparation of pure molybdenum.

9 dwg, 3 tbl, 4 ex

 

Method for the selective extraction of molybdenum (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 molybdenum (VI).

It is known that aqueous solutions can be distinguished molybdenum in the form of trisulde [Voldman G.M., Zelikman A.N. theory of hydrometallurgical processes, M.: metallurgy. - 1993. S-311].

The disadvantage of this method is that along with trisulfide, molybdenum precipitate sulfides of other metals. Used to practice the method of deposition trisulde molybdenum from solutions of sodium tungstate does not provide a high selectivity of the process, because molybdenum is deposited up to 0.2-0.3% tungsten. In addition, the deposition from acidic solutions leads to the release of hydrogen sulfide.

There is a method of extraction of molybdenum (VI) from solutions containing cations of heavy metals, including the preparation of the solution, sorption of molybdenum (VI) by ion-exchange resin at pH<7 [SU 1777369 A1, IPC 22, 34/34, publ. 20.05.1996].

The disadvantage of this method is that no sorption anion S-2B and AMP, which could provide high selectivity of extraction of molybdenum (VI) from solutions containing cations of heavy is yellow.

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

The technical result that can be achieved by carrying out the invention, a high selectivity of the extraction of ions of molybdenum (VI) from solutions of heavy metal cations with the simultaneous simplicity and reduction stages of obtaining pure molybdenum and its compounds.

This technical result is achieved in that in the method of extraction of molybdenum (VI) from solutions of cations of heavy metals, including the preparation of the solution, sorption of molybdenum (VI) by ion-exchange resin at pH<7, sorption of lead from aqueous solution by anion exchange resin S-2B and AMP when the value of pH, lower pH, hydrolytic precipitation of heavy metal cations and higher pH the formation of molybdenum cations (pH~1).

The essence of the method is illustrated by drawings, where figure 1-8 are based residual concentration of molybdenum (VI) on pH, time of adsorption and pre-processing of the sorbent, and figure 9 is given the option process flow diagram of the processing of the initial solution, and the data of tables 1-3, where there are residual concentration of heavy metal cations and the degree of their extraction from the solution.

With the bciu Mo (VI) was obtained from 200 cm 3the original solution of Na2Moo4the mass of sorbent 2, Macroporous anion exchange resin brand AM-2B containing exchange group-CH2-N(CH3)2, -CH2-N(CH3)3,

and gel anion exchange resin brand AMP that contains exchange group

within days it was kept in distilled water (figures 1 - 1-3, 5, 7-8), or in 0.1 N. NaOH solution (figures 2 - 1-3, 5, 7-8), or in 0.1 N. the solution of Hcl (figures 3 figure 1-2, 7-8 and figure 4-6).

Ion concentration of molybdenum 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 NaOH or Hcl. Set the pH value was maintained for 5 hours from the beginning of the sorption neutralization solution, in the future, the pH value changed is slightly camping, therefore, the adjustment of pH was carried out once a day.

Sorption was carried out at room temperature.

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

Examples of specific implementation method.

Example 1 (figure 1-2, table 1)

The original solution contained (g/DM3: 12,8 Co (II), 6,5 Mo(VI).

Sorbent AM-2B.

Figure 1-2 shows the results of extraction of molybdenum (VI) from solution l2the sorption at pH of 2.5 (1) 4.0 (2).

The best extraction two days sorption obtained at pH 2.5 and water handling sorbent (SOY=530 mg/g extract 81,5%).

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, wt.% from source
sourceresidual
pH 2,5
H2O

NaOH

HCl
was 12.75

was 12.75

was 12.75
12,70

11,65

11,47
0,4

8,6

10,0
pH 4.0
H2About

NaOH

HCl
was 12.75

was 12.75

was 12.75
12,70

12,70

11,65
0,4

0,4

8,6

Example 2 (figure 3-6, table 2)

The original solution contained (g/DM3: 12,1-13,6 Ni (II), 0,85 and 6.6 Mo (VI).

Sorbent AM-2B.

Figure 3-6 presents the results of the extraction of molybdenum (VI) from solution NiCl2the sorption at pH of 2.5 (figure 3-4) and 4.0 (5-6).

The best extraction two days sorption obtained at pH 4 and acidic treatment of the sorbent (SOY=494 mg/g extract 74,4%).

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

Table 2
Pre-treatment sorbentThe concentration of Ni (II), g/DM3Extract, wt.% from source
sourceresidual
pH 2,5
H2O

NaOH

HCl
12,06

12,06

13,60
11,96

10,46

13,52
0,8

8,6

12,1
pH 4.0
H2O

NaOH

HCl
13,60

13,60

12,86
13,55

13,39

11,81
0,4

1,5

8,2

Example 3 (Fig.7-8, table 3)

The original solution contained (g/DM3: the 15.6-16,0 is n (II) and 6.6 Mo(VI).

Sorbent AM-2B.

7-8 gives the results of extraction of molybdenum (VI) from solution nl2the sorption at pH of 2.8 (7) and 4.0 (Fig).

The best performance of extraction in 2 days sorption obtained at pH 4 and water handling sorbent (SOY=499 mg/g extract 97,5%).

In table 3 given extract MP (II) in solution after four days of contact solution and sorbent.

Table 3
Pre-treatment sorbentThe concentration of MP (II), g/DM3Extract, wt.% from source
sourceresidual
the pH of 2.8
H2O

NaOH

HCl
15,60

15,60

15,60
15,55

11,20

12,40
0,6

28,2

26,9
pH 4.0
H2About

NaOH

HCl
16,00

16,00

14,47
14,40

12,40

12,21
10,0

22,5

the 15.6

Example 4

The original solution contained (g/DM3: was 12.75 Ni (II) and 6.6 Mo (VI).

Sorbent AMP

After a day of adsorption at acidic handling sorbent receive the following output:

The sorption time, hOS is enough concentration of Mo (VI), g/DM3,SOY, mg/g
244,8184

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

Figure 9 is given the option process flow diagram of the processing of the initial solution.

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

The method of extraction of molybdenum (VI) from solutions containing cations of heavy metals, including the preparation of the solution, sorption of molybdenum (VI) by ion-exchange resin at pH<7, characterized in that the sorption of lead from aqueous solution by anion exchange resin S-2B and AMP when the value of pH less than the pH of hydrolytic precipitation of heavy metal cations and more of pH, the formation of molybdenum cations (pH~1).



 

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FIELD: hydrometallurgy.

SUBSTANCE: invention relates to sorption-mediated recovery of molybdenum from solutions containing heavy metal cations. Method of invention comprises providing solution to be treated, sorption of molybdenum(VI) on anionite at pH < 7. Sorption is conducted from solutions with anionites AM-2b and AMP at solution pH below pH of hydrolytic precipitation of heavy metal cations but higher than pH of formation of molybdenum cations (pH ~ 1).

EFFECT: increased process selectivity and reduced number of stages in preparation of pure molybdenum.

9 dwg, 3 tbl, 4 ex

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