The way the sorption of tungsten (vi)

 

The method of extracting tungsten (VI) from aqueous solution relates to the field of 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. The technical result of the invention is to find the optimum conditions for rapid and efficient way to extract ions of tungsten (VI) from aqueous solution. Before adsorption of the anion exchange resin is subjected to acidic water or alkaline treatment, sorption of lead on the anion exchange resin brand AMP that contains exchange groupat pH greater than 5 and not more than 5 hours At a preliminary water or alkaline treatment of the anion sorption of lead at pH 7-9. 6 Il.

The method of extracting tungsten (VI) from aqueous solution relates to the field of 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.

It is known the use of ion exchange resins for processing solutions of sodium tungstate [Zelikman A. N., Kites B., metallurgy of rare metals. - M.: metallurgy, 1991, S. 38-39]. To this end, apply slightly basic anion exchange resin, provided the duration of the sorption process.

The closest technical solution is the way sorption of tungsten ions from an aqueous solution comprising contacting the solution with an anion exchange resin [Zelikman A. N. Metallurgy of refractory rare metals. - M.: metallurgy, 1986, S. 70].

The disadvantage of this method is that the sorption was studied without taking into account pre-treatment sorbent, which 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.

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.

This technical result is achieved by the fact that in the known method of sorption of tungsten (VI) from aqueous solution comprising contacting the solution with an anion exchange resin, prior to adsorption of the anion exchange resin is subjected to acidic water or alkaline treatment, sorption of lead on the anion exchange resin brand AMP that contains exchange group

at pH greater than 5 and not more than 5 h, and when the preliminary water or the given dependence of sorption exchange capacity (SOY) sorbent, mg W(VI) per 1 g of sorbent, the pH of the solution, time of sorption and method of pre-treatment sorbent.

Examples of specific implementation method.

Sorption of W (VI) was obtained from 200 cm3the original solution of Na2WO4the mass of sorbent (anion) 2 g Sorbent previously in the day was passed in 0.1 n solution of NaOH, HCl or distilled water.

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 NaOH and Hcl. Set the pH value was maintained for 5 h from the start of the sorption neutralization solution, further velichestvami at room temperature.

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

Example 1 (Fig.1, 2).

Sorbent previously in the day was passed in 0.1 n NaOH solution.

In Fig.1 are given the results of sorption from aqueous solution with a concentration of 3000 mg W(VII)/DM3during 3 days. Sorption is carried out at 5 < pH<12. The best results were obtained at pH 7-9 during 1 h, SOY=188-299 mg/g At pH>9 over time SOY sorbent is reduced.

In Fig.2 given the dependence of SOY, mg/g, from the time of sorption, h, for a solution with an initial concentration of 9 g/DM3W(VI). At the initial sorption during 5 h SOY=210 mg/g, then over time the sorption decreases and during 2 days SOYBEANS=150 mg/,

Example 2 (Fig.3, 4).

Sorbent previously in the day was passed in 0.1 n Hcl solution.

In Fig.3 are given the results of sorption from aqueous solution with a concentration of 3000 mg W(VII)/DM3during 3 days. Sorption is realized at pH>5 during 5 h SOY=150-175 mg/g) and within 3 days practically does not change.

In Fig.4 presents the dependence of SOY sorbent time, h, from a solution with an initial concentration of 4.5 g/DM3W(VI) sorption at pH 6 and pH 11. Sorption at pH 11 at the initial moment of vramanibai same and COE=180-188 mg/g for the time up to 3 days.

Example 3 (Fig.5, 6).

Sorbent previously in the day was kept in distilled water.

In Fig.5 gives the results of sorption from aqueous solution with a concentration of 3000 mg W(VII)/DM3during 3 days. Sorption is realized at pH>6. The best results were obtained at pH 7-9 during 5 h SOY=195 mg/g At pH>9 over time SOY sorbent is reduced.

In Fig.6 given the dependence of SOY sorbent (mg/g), W(VI) from time to time, day, at pH 7 for sorption from solutions with initial concentrations FromRef=5 g/DM3W(VI) and (CRef=7 g/DM3W(VI). Sorption is carried out during 2-3 h and reaches a value of SOYBEANS=320-340 mg/year In the future, SOY sorbent varies slightly.

From the data of Fig.1-6, it follows that at room temperature the results of sorption depends on pre-treatment sorbent, the concentration of the initial solution, the pH of the solution in the process of sorption and sorption time.

Polymerization processes in weakly acidic solutions, affect Velino SOY sorbent.

When alkaline and water treatments sorbent best results are obtained at pH 7-9 for 1 and 5 h, respectively, while SOY sorbent has a higher value during alkaline treatment.

When the acid treatment is>what about the comparison with the prototype sorption on ion-exchange resin brand AMP under optimal conditions is a quick and effective method of extraction of ions of tungsten (VI) from aqueous solutions.

Claims

1. The way the sorption of tungsten ions from aqueous solutions, comprising the contacting of the solution with an anion exchange resin, characterized in that before the adsorption of the anion exchange resin is subjected to acidic water or alkaline treatment, sorption of lead on the anion exchange resin brand AMP that contains exchange group

at pH greater than 5 and not more than 5 hours

2. The method according to p. 1, characterized in that during the preliminary water or alkaline treatment of the anion sorption of lead at pH 7-9.

 

Same patents:

The invention relates to ferrous metallurgy and can be used for processing mixed fortraveling concentrates, obtaining calcium tungstate and compounds of tin

The invention relates to hydrometallurgy of refractory metals and can be used in electrochemical recycling tungsten-containing hard alloy

The invention relates to the extraction of substances extraction and can be used in ferrous and nonferrous metallurgy, as well as treatment of industrial and domestic wastewater
The invention relates to hydrometallurgy refractory metals

The invention relates to the field of hydrometallurgy of non-ferrous metals, mainly to methods of obtaining parabolicamara ammonium (PVA) or tungsten trioxide of tungsten-containing raw materials

The invention relates to the mining industry, namely the pyrometallurgical production, in particular the decomposition of tungsten-bearing ores

The invention relates to the field of metallurgy of rare metals, in particular to the hydrometallurgical decomposition of tungsten raw materials

The invention relates to hydrometallurgy

The invention relates to hydrometallurgy of precious metals, in particular to the process of extracting gold and silver from solutions with low content (discharge slurry tailings and sea water)

The invention relates to analytical chemistry, chemical technology and ecology and can be used for the detection of small amounts of Cu, Fe and Zn in waters after pre-concentration
The invention relates to hydrometallurgy of precious metals, in particular to the recovery of precious metals from cyanide solutions and/or slurries

The invention relates to a method of recovering chlorine from solutions obtained in the chemical, pulp and paper and steel industry, and can be used in the recovery of gold from solutions containing active chlorine

The invention relates to a technology of extracting metals from aqueous solutions and can be used in industrial wastewater treatment complex composition of cations of different metals

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

Up!