The way the sorption of molybdenum (vi)

 

The method of extraction of molybdenum (VI) from aqueous solutions 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 is to find the optimum conditions for rapid and efficient way to extract ions of molybdenum (VI) from aqueous solutions. This is achieved by the fact that the sorption is carried out by ion-exchange resin brand AMP that contains exchange group: -CH2-. The sorption of lead at pH>4 and not more than one hour during the preliminary acidic, alkaline or aqueous treatment of the anion. At pH=1-4 and time of sorption more days are in the preliminary acid or aqueous treatment of the anion. 2 C.p. f-crystals, 5 Il.

The method of extraction of molybdenum (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 molybdate [R. Ripen, I. Cetanu Inorganic chemistry, I. 2. the nits.

The disadvantage of the methods is the length of the sorption process.

The closest technical solution is a method of ion sorption of molybdenum from aqueous solutions, including contact solution and the anion of the brand of the AMS containing exchange group-CH2-N+at different pH values from 5 to 2 [Zelikman A. N. The molybdenum. M.: metallurgy, 1970, S. 150-153].

The disadvantage of this method is that the sorption was studied without the influence of pre-treatment sorbent.

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 molybdenum from the aqueous solution.

The technical result that can be achieved with the implementation of the invention is to increase the efficiency of the process of sorption of molybdenum from the aqueous solution.

This technical result is achieved by the method of ion sorption of molybdenum from aqueous solutions, including contact solution and the anion brand AMP that contains exchange group

-CH2-N+,

before adsorption of the anion exchange resin is subjected to a preliminary acid, alkali and water treatments. P is not more than an hour. After a preliminary acid or water treatment of the anion sorption is carried out at pH=1-4 and more time of day.

The essence of the method is illustrated by drawings, where Fig.1-5 are based sorption exchange capacity (SOY) anion-exchange sorbent, mg, Mo(VI) in 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 Mo (VI) was obtained from 200 cm3the original solution of Na2Moo4mass 2 sorbent, the Sorbent previously in the day was passed in 0.1 n solution of NaOH, HC1, or in distilled water.

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. For supp 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 was changed slightly, so 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/,

Example 1 (Fig.1, 2).

Sorbent previously in the day was kept at 0.1 N. HCl solution.

In Fig.1 are given the results of sorption from aqueous solution with a concentration of 1618 mg Mo(VII)/DM3during 7 days. Sorption essestials in the range of pH=1-13. At pH>6 sorption was carried out for a time less than 1 hour, SOY=101-122 mg/g At pH<6 in less than 1 hour sorption is negligible, SOY=30-70 mg/g, and during more days sorption increases, COE=115-155 mg/, the Best results were obtained at pH=10-11 during 1 day SOY=132 mg/g, pH=5 at time 2 days SOYBEANS=145 mg/g, at pH=5 per time, 3 days SOYBEANS=150 mg/g at pH=3 in less than 7 days SOYBEANS=155 mg/,

In Fig.2 shows the results of sorption at pH=8 from aqueous solution with a concentration of 1608 mg/DM3(curve 1) and pH=4 from aqueous solutions with concentration, mg/DM3: 1608 and 2400 (curves 2, 3, respectively). At pH=8 sorption was slightly increased, SOY=115 mg/g At pH=4 and time of sorption of 1 hour sorption for all concentrations is negligible, SOY=13-26 mg/g, and at the time of sorption more days increased, SOY=140-200 mg/,

Example 2 (Fig.3, 4).

Sorbent previously in the day was kept at 0.1 N. NaOH solution.

In Fig.3 are given the results of sorption from aqueous solution with a concentration of 1880 mg Mo(VII)/DM3during 6 days. Sorption was carried out in the range of pH=1-12. At pH6 sorption was carried out for a time less than 1 hour, SOY=110-145 mg/g At pH=1-6 in less than 1 hour sorption is negligible, SOY=20-90 mg/g, and during more days sorption increases, SOY=120-145 mg/g At pH=0 sorption did not exceed the value of SOYBEANS=94 mg/g, this value is received within 3 days and was not changed. The best results were obtained at pH=9-10 during 1 day SOY=140 mg/g, pH=5 at time 2 days SOYBEANS=135 mg/g at pH=5 per time, 3 days SOYBEAN-150 mg/g at pH=3-5 per time less than 5 days SOYBEANS=140-145 mg/,

In Fig.4 shows the results of sorption at pH 3 from aqueous solution with a concentration of 2,700 mg/DM3(curve 1) and 3200 mg/DM3(curve 2). At pH=3 sorption was carried out for 1 hour, SOY=80 and 167 mg/g, respectively, the results of the sorption within 1-4 days increased to values SOYBEANS=220, 286 mg/g according to the E.

In Fig.5 gives the results of sorption from aqueous solution with a concentration of 1618 mg Mo(VII)/DM3during 7 days. Sorption was carried out in the range of pH=1-13. At pH6 sorption was carried out for a time less than 1 hour, SOY=110-121 mg/g At pH<6 in less than 1 hour sorption is negligible, SOY=20-80 mg/g, and during more days sorption increases, SOY=120-155 mg/, the Best results were obtained at pH=8-9 during 1 day SOY=118 mg/g, pH=4 per time, 2-3 days SOYBEANS=141 mg/g at pH=3 for time 7 days SOYBEANS=155 mg/,

From the data of Fig.1-5, 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.

Obtained similar results sorption with prior acid or water treatments sorbent. Polymerization processes in weakly acidic solutions, slightly increase the sorption capacity of the gel sorbent, but reduce the speed of sorption as a polymerization conversion is carried out in time.

During alkaline treatment of the sorbent polymerization processes in weakly acidic region, reduce the speed of sorption, while sorption is influenced by the alkaline sorbent in the field over time, there is a small decrease in sorption capacity, that may be due to degradation of the sorbent in alkaline environments.

Compared with the prototype sorption on anionics brand AMP under optimal conditions is a quick and effective method of extraction of ions of molybdenum (VI) from aqueous solutions.

Claims

1. The method of ion sorption of molybdenum from aqueous solutions, including contact solution and the anion brand AMP that contains exchange group

characterized in that before the adsorption of the anion exchange resin is subjected to a preliminary acid, alkali and water treatments.

2. The method according to p. 1, characterized in that after the preliminary acidic, alkaline or water treatment of the anion sorption of lead at pH>4 and not more than an hour.

3. The method according to p. 1, characterized in that after the preliminary acid or water treatment of the anion sorption of lead at pH 1-4 and more time of day.

 

Same patents:

The invention relates to hydrometallurgy

The invention relates to a process of producing compounds of molybdenum - molybdenum disulfide having anti-friction properties, the resulting two-stage acid lapping natural molybdenite and special modes of washing and drying

The invention relates to hydrometallurgy rare metals, extraction of molybdenum from acidic sulphate-nitrate solutions and its purification from impurities

The invention relates to metallurgical industry, namely the processing of molybdenum concentrates and middlings

The invention relates to the field of hydrometallurgy of non-ferrous and rare metals and can be used for the extraction of molybdenum (IV), presents an anionic form in solution

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 the production of highly pure compounds molybdenum and bismuth from various types of raw materials

The invention relates to the processing of molybdenum concentrate

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

The invention relates to hydrometallurgy, in particular coal sorption technology for the recovery of precious metals from solutions and slurries

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!