Selective extraction of tungsten (vi)

FIELD: metallurgy.

SUBSTANCE: procedure for extraction of tungsten (VI) from solutions of cations of heavy metals consists in sorption of tungsten (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: efficient procedure for selective extraction of ions of tungsten from water solution of cations of heavy metals.

2 dwg, 2 tbl, 2 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 [Meyerson GA, Zelikman A.N. Metallurgy of rare metals. M: State. Nauch.-technology. publishing house of literature on ferrous and nonferrous metallurgy. - 1955. - P.66-70].

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

Known methods of extracting tungsten (VI) [Patent 2253687 of the Russian Federation, IPC SW 34/36, 3/24, publ. 10.06.05] from solutions containing cations of heavy metals, including sorption of tungsten (VI) by ion-exchange resin.

The disadvantage is that the unknown optimal conditions for the extraction of tungsten (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 tungsten (VI) from an aqueous solution of cations of heavy metals.

The technical result that can be achieved with domestic the invention, is the high selectivity of the extraction of ions of tungsten (VI) with the simultaneous simplicity and efficiency, and reduce stages of obtaining pure tungsten.

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 (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 W (VI), TH, mg/g - exchange capacity of the sorbent, mg sorbed metal ion per 1 g of sorbent, at a given time and SOYBEANS, 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:

Particle size, mm+2,2+2,0 +0,8+0,315+0,125+0,08
% mass1,457,628,811,01,00,2

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 were kept at 0.1 N. the HCl (acid treatment) or in distilled water (water treatment). The volume of solution 100 cm3the mass of dry sorbent 1,

Ion concentration W (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, to guarantee the achievement of the equilibrium contact of the sorbent and rest the RA carried out at least one day. To maintain a given pH value of the solution in the process of sorption as neutralizers used a solution 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 the concentrations of tungsten ions in aqueous solution, initial 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: 0,93-0,95 W; 10,42 Cu, or 10,34 With, or 15,56 Ni.

Sorption was carried out at pH of 2.5.

Figure 1 is given the dependence on time, min, residual concentration of W (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 Me (II), where Me=Cu, Co, Ni, and W (VI).

Example 2 (figure 2, table 2)

The sorbent during the day were kept at 0.1 N. HCl solution.

The original solution contained (g/DM3: 0,93-0,95 W; 10,42 Cu, or 10,34 With, or 15,56 Ni.

Sorption was carried out at pH of 2.5.

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

In table 2 given ejecting ions W (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 after 70 min of sorption extraction of cations of Me (II) is insignificant and is in the range of 0.2 to 0.7 wt. -%, and removing anions W (VI) within 29-38% of the mass.

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 tungsten (VI) from an aqueous solution of cations of heavy metals.

Table 1
Time minThe concentration of W (VI), mg/DM3SOY, mg/g) W(VI)The concentration of Me (II), g/DM3Extract, % mass.
W(VI)Me (II)
A solution of CuSO4and Na2WO4
0928-10,42--
58904---
1080113---
3069124---
6058934---
785513810,13of 40.90,3
144053939---
The solution CoSO4and Na2WO4
0948-10,34--
59005---
1083112---
3079316---
6076019---
786792710,3128,50,3
144066828-
The solution with NISO4and Na2WO4
0952-15,60- -
59203---
1080015---
3075020---
6070250---
786333215,5333,60,5
144060135---

Table 2
Time minThe concentration of W (VI), mg/DM3 SOY, mg/g) W(VI)The concentration of Me (II), g/DM3Extract, % mass.
W(VI)Me (II)
A solution of CuSO4and Na2WO4
0928-10,42--
58904---
1080113---
3069124---
6058934---
785773510,380,4
144056436---
The solution CoSO4and Na2WO4
0948-10,34--
59282---
109005---
308599---
6078416---
7869825there is a 10.03 28,53,0
144068926-
The solution with NISO4and Na2WO4
0952-15,56--
59005---
1085010---
3080215---
6070725---
786662915,50 30,50,4
144062033---

The method of extracting tungsten (VI) from solutions of cations of heavy metals, including sorption of tungsten (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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