The method of extracting tungsten (vi) from aqueous solution

 

(57) Abstract:

The method of extracting tungsten (VI) from aqueous solution relates to the field of extraction of substances with the use of sorbents and/or flocculants and can be used in ferrous and nonferrous metallurgy, as well as for the treatment of industrial and domestic wastewater. In the method of sorption of tungsten (VI) from aqueous solutions containing the processing solution and the sorbent, the contact solution and the sorbent and the sorption of tungsten at pH < 7, sorption exercise bentonite clay with correction of pH under continuous stirring the solution for 4 to 7 h, is provided cheaper method of extracting tungsten (VI) through the use of inexpensive natural sorbent. 3 Il., 3 table.

The method of extracting tungsten (VI) from aqueous solution relates to the field of extraction of substances with the use of sorbents and/or flocculants and can be used in ferrous and nonferrous metallurgy, as well as for the treatment of industrial and domestic wastewater.

The known method of ion exchange wastewater treatment [A. A. Ashirov. Ion exchange wastewater treatment, solutions and gases. L., Chemistry, 1983], in which for wastewater treatment using clay aluminosilicate materials, osnovnolozhenia clay to extract metal ions, that leads to increased consumption of reagents.

The closest technical solution is the method of adsorption of W (VI) on activated carbon at pH < 7 [Polyhedron, 1989-8, N 1 C. 71-761.

The disadvantage of this method is that for adsorption used relatively expensive sorbent, in addition, the sorption was studied depending on the pH of the initial solution and does not take into account the change in pH in the sorption process that affects the final results of the extraction of tungsten ions from solution.

Task to be solved by the claimed invention is directed, is to find the optimum conditions for rapid and efficient way to extract ions of tungsten (VI) from aqueous solution using inexpensive natural sorbent.

The technical result that can be achieved with the implementation of the invention is the efficiency of the process of sorption of tungsten (VI) from aqueous solution by using low cost natural adsorbent.

This technical result is achieved by the fact that in the known method of sorption of tungsten (VI) from aqueous solutions containing the processing solution and the sorbent, the contact solution and the sorbent and the sorption of tungsten at pH < 7, Sorbi is 4-7 hours.

The essence of the method is illustrated by drawings, where Fig. 1 (a, b, c) given the dependence of sorption exchange capacity (SOY) clay in mg W(VI) in 1 g of clay from the pH of the solution and the retrieval time , h, when used as a Converter to maintain a given pH value of acid (H2SO4(Fig. 1a), HCl (Fig. 1b) and HNO3(Fig. 1c), as well as the drawings Fig. 2 (a, b, c), which is a cross section diagram of Fig. 1 (a, b, c) at pH 5 and drawings of Fig. 3, where given the dependence of SOY clay, mg/g, from time to time , min, initial concentration of the solution of 485 mg/DM3W(VI) when used as a neutralizer of acid HCl.

Examples of specific implementation method

Sorption of tungsten (VI) bentonite clay (montmorillonite) Alagir district of North Ossetia-Alania was carried out from an aqueous solution of sodium tungstate at a concentration of clay in a solution of 5 g/DM3. The concentration of ion W(VI) was determined by the colorimetric method on the photocolorimeter KFK-3, and acid-base characteristics of the solutions was controlled by a pH-meter pH-121.

Bentonite clay has alkaline properties and upon contact of the clay with water, the alkalinity of the solution increases with increasing concentration of clay decreases with time to the frame of the pH value of the solution in the sorption system was added in portions acid. Correction of pH with continuous stirring of the solution was carried out for 4-7 hours. After a specified time further contact of the clay with a solution was carried out without stirring and without pH correction.

Example 1 (Fig. 1a and 2a).

As the acid catalyst used H2SO4.

From the data of Fig. 1a and 2a, it follows that the sorption of ions of W(VI) is carried out at pH < 7.

The best sorption characteristics obtained under the following conditions (see tab. 1).

Example 2 (Fig. 1b and 2b).

As the acid catalyst used HCl.

From the data of Fig. 1b and 2b, the sorption of ions of W(VI) is carried out at pH < 7.

The best sorption characteristics obtained under the following conditions (see tab. 2).

Example 3 (Fig. 1c and 2c).

As the acid catalyst used HNO3.

From the data of Fig. 1c and 2c, it follows that the sorption of ions of W(VI) is carried out at pH < 7.

The best sorption characteristics obtained under the following conditions (see tab. 3).

Example 4 (Fig. 3).

From the data of Fig. 3 shows that with increasing concentration of ions W(VI) in the original solution SOYBEANS clay increases.

From compared what becomes 3 times.

Experiments established that in the studied systems in acidic solutions, the formation of insoluble tungstic acid and reduced forms of tungsten, in this case clay manifests itself not only as a sorbent and a neutralizer for acidic solutions, but also as a flocculant.

The obtained experimental data allow to draw the following conclusions:

1. Removing ions W(VI) from aqueous solution is carried out at pH < 7.

2. The nature of the anion of the acid affects the rates of sorption ion W(VI) clay. On decrease of the degree of extraction of tungsten (VI) acid are in the range: HNO3H2SO4, HCl.

3. Sorption maximum at the initial contact of the clay with a solution and in the presence of nitrates and chlorides, and other times sorption.

4. The maximum possible sorption at pH 5 and at pH 0, SOYBEANS = 4-8 mg/g

Developed a method of extracting ions of tungsten (VI) from solution using bentonite clay is effective for the treatment of sewage of industrial enterprises, tailings, mine and mine waters.

Compared with the prototype of the proposed method allows a rapid and efficient extraction of tungsten (VI) mA (VI) from aqueous solution, including the processing solution and the sorbent, the contact solution and the sorbent and the sorption of tungsten at pH<7, characterized in that the sorption exercise bentonite clay with adjustment of pH with continuous stirring of the solution for 4-7 hours

 

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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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