Selective extraction of molybdenum (vi) from solutions of cations of heavy metals

FIELD: metallurgy.

SUBSTANCE: procedure for extraction of molybdenum (VI) from solutions of cations of heavy metals consists in sorption of molybdenum (VI) at value of pH of solution less, than value of pH of hydrolytic sedimentation of cations of heavy metals. As sorbent at sorption there is used activated bone coal.

EFFECT: raised efficiency of procedure.

2 tbl, 2 dwg, 2 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 molybdenum deposited other insoluble impurities.

Known methods of extraction of molybdenum (VI) [patent 2247166 of the Russian Federation, IPC C22B 34/34, 3/24, publ. 27.02.05] from solutions containing cations of heavy metals, including sorption of molybdenum (VI) by ion-exchange resin.

The disadvantage is that the unknown optimal conditions of extraction of molybdenum (VI) on activated bone coal from solutions containing cations of heavy metals.

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

The technical result that can be achieved by carrying out the invention, is the highest village of the efficiency of extraction of ions of molybdenum (VI) with the simultaneous simplicity and efficiency, as well as the reduction stages of obtaining pure molybdenum.

This technical result is achieved by the fact that in the known method of extraction of molybdenum (VI) from solutions of cations of heavy metals, including sorption of molybdenum (VI) when the value of pH, lower pH, hydrolytic precipitation of heavy metal cations on the sorbent and the sorbent used activated bone charcoal.

The essence of the method is illustrated by drawings, where figure 1 and 2 and in table 1 and 2 shows the dependence of the residual concentration of Mo (VI), TH, mg/g - exchange capacity of the sorbent, mg sorbed metal ion per 1 g of sorbent, at a given time and COE, mg/g sorption capacity at equilibrium the pH, time of sorption and method of pre-treatment sorbent.

Used in studies of activated carbon (AC) obtained by the carbonization of the bones of domestic animals (waste meat industry) followed by activation with water vapor.

Humidity - 14.5%, ash content of 2.5%.

Fractional composition AU:

td align="left"> % mass
Particle size, mm+2,2+2,0+0,8+0,315+0,125+0,08
1,457,628,811,01,00,2

According to the spectral analysis of the major inorganic components of the AU are Ca, Mg, etc.

Sorption from solution was carried out in static conditions with continuous stirring. In the sorption process was supported by the specified pH value of solutions by neutralization of the acid is HCl or alkali NaOH. Pre-sorbent during the day kept in 0.1 n HCl (acid treatment)or in distilled water (water treatment). The volume of solution 100 cm3the mass of dry sorbent 1,

Ion concentration Mo (VI) 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 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 in isovale solutions of NaOH and HCl. Set the pH value was maintained within 2 hours from the beginning of the sorption neutralization solution, in the future, the pH value was changed slightly.

Sorption was carried out at room temperature.

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

Examples of specific implementation method.

Example 1 (figure 1, table 1)

The sorbent during the day kept in distilled water.

The original solution contained (g/DM3: 0,80-0,97 Mo; 9,18 Cu, or 12,32 Co, or 14,93 Ni.

Sorption was carried out at pH=2,5.

Figure 1 is given the dependence on time, min, residual concentration of Mo (VI), mg/DM3from a solution containing: cation Cu (II) - curve Cu, or the cation Co (II) - curve Co, or Ni cation - curve Ni.

In table 1 given ejecting ions of Mo (VI) and Me (II), where Me=Cu, Co, Ni.

Example 2 (figure 2, table 2)

The sorbent during the day kept in 0.1 n HCl solution.

The original solution contained (g/DM3: 0,80-0,97 Mo; 9,18 Cu, or 12,32 Co, or 14,93 Ni.

Sorption was carried out at pH=2,5.

Figure 2 given the dependence on time, min, residual concentration of Mo (VI), mg/DM3from a solution containing: cation cu (II) - curve Cu, or the cation Co (II) - curve Co, or Ni cation - curve Ni.

In table 2 is given to the extraction of ions of Mo (VI) and Me (II), where Me=Cu, Co, Ni.

From the data of figures 1 and 2 and table 1 and 2 it follows that cher is C 70 min sorption extraction of cations of Me (II) is insignificant and is in the range of 0.2-0.7 wt.%, and removing the anion of Mo (VI) - within 50-68 wt.%, SOY=48-65 mg/year Pre-processing AU has little effect on the results of sorption.

Compared with the prototype offer an efficient and economical method provides selective extraction of ions of molybdenum (VI) from an aqueous solution of cations of heavy metals.

td align="center"> -
Table 1
Time minThe concentration of Mo (VI), mg/DM3TH, mg/g of Mo (VI)The concentration of Me (II), g/DM3Extract, wt.%
Mo (VI)Me (II)
A solution of CuSO4and Na2MoO4
0807-9,18--
559222---
1054127--
3047833---
6037743---
78327489,1259,50,7
144033148---
The solution CoSO4and Na2MoO4
0956-12,32--
58935---
1058937- --
3034361---
6033462---
783036512,22680,8
The solution with NISO4and Na2MoO4
0965-14,93--
578518---
1069127---
3062434- --
6056440--
784874814,8949,70,3
144044852---

Table 2
Time minThe concentration of Mo (VI), mg/DM3TH, mg/g of Mo (VI)The concentration of Me (II), g/DM3Extract, wt.%
Mo (VI)Me (II)
A solution of CuSO4and Na2MoO4
0807-9,18--
558722---
1038442---
3035345---
6034047---
78321499,1260,70,7
The solution CoSO4and Na2MoO4
0956-12,32--
567928---
1043252---
3033762---
6032563---
783186412,2966,90,2
The solution with NISO4and Na2MoO4
0965-14,93--
584312---
1078818---
3062434--
6059437---
784625014,8651,80,5
144037759---

The method of extraction of molybdenum (VI) from solutions of cations of heavy metals, including sorption of molybdenum (VI) when the value of pH, lower pH, hydrolytic precipitation of heavy metal cations on the sorbent, characterized in that the sorbent used activated bone charcoal.



 

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