The way the sorption of molybdenum (vi) from aqueous solutions

 

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. The objective of the invention is to find the optimum conditions for rapid and efficient way to extract ions of molybdenum (VI) from aqueous solution. This is achieved by the fact that the sorption is carried out at pH 1-6 on the anion exchange resin brand AM-2B containing exchange group-CH2-N(CH3)2, -CH2-N(CH3)3and before sorption perform preliminary processing of the anion of the acid, alkali or water. Sorption specified sorbent is a quick and effective method of extraction of ions of molybdenum (VI) from aqueous solutions. 4 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 [Rian R., Cetanu I. Inorganic chemistry, I. 2. Chemistry of metals. /Ed. by C. I. Spokes what 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 brand AM-2B [Ion exchangers in nonferrous metallurgy. /Ed. by K. B. Lebedev. - M.: metallurgy, 1975, S. 206 and 207].

The disadvantage of this method is that the sorption was studied depending on the pH of the initial solution and does not take into account the change of the pH value 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 molybdenum (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 molybdenum (VI) from aqueous solution.

This technical result is achieved by the fact that in the known method of sorption of molybdenum (VI) from aqueous solutions containing the contact solution and the anion brand S-2B, before sorption perform preliminary processing of the anion of the acid, alkali or water, and the sorption of lead at pH 1-6 on the anion exchange resin containing exchange group-CH2-N(CH3)2, -CH2-N(CH3)

Examples of specific implementation method.

Sorption of Mo (VI) was obtained from 200 cm3the original solution of Na2MoO42H2O, lot of 2 sorbent, the Sorbent previously in the day was passed in 0.1 n solution of NaOH, H2SO4or 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. To maintain a given pH value of the solution in the process of sorption as neutralizers used a solution of NaOH or Hcl. Set the pH value was maintained in the volume correction 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)

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 3000 mg of Mo(VI)/DM3during 3 days. Sorption is realized in the range of pH 1-6. The best results were obtained at pH 2-3 at a time less than 3 days, SOY=247 mg/,

Example 2 (Fig.2)

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

In Fig.2 shows the results of sorption from aqueous solution with a concentration of 3000 mg of Mo(VI)/DM3during 3 days. Sorption is realized in the range of pH 1-6. The best results were obtained at pH 2-4 time for 3 days, SOY=247 mg/,

Example 3 (Fig.3 and 4)

Sorbent previously in the day was kept in distilled water.

In Fig.3 are given the results of sorption from aqueous solution with a concentration of 3000 mg of Mo(VI)/DM3during 3 days. Sorption is realized in the range of pH 1-6. The best results were obtained at pH 4 during 6 days, SOY=277 mg/,

In Fig.4 shows the results of the sorption of Mo(VI) at pH 4, depending on the concentration ishodnoe=390 mg/g at CRef=9.0 g/DM3Mo(VI) and time of sorption 25 PM

From the data of Fig.1-4, 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.

Polymerized processes in weakly acidic solutions, increase the sorption capacity macroporous sorbent, but reduce the speed of sorption as a polymerization conversion is carried out in time.

Compared with the prototype sorption on ion-exchange resin brand AM-2B under optimal conditions is a quick and effective method of extraction of ions of molybdenum (VI) from aqueous solutions.

Claims

The method of ion sorption of molybdenum from aqueous solutions, including contact solution and the anion brand S-2B, characterized in that before sorption perform preliminary processing of the anion of the acid, alkali or water, and the sorption of lead at pH 1-6 on the anion exchange resin containing exchange group

-CH2-N(CH3)2,

-CH2-N(CH3)3.

 

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 a process of producing compounds of molybdenum: molybdenum disulfide having anti-friction properties, obtained by heat treatment of the mixture trisulde molybdenum and sodium sulfosalicylate

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

The invention relates to the field of hydrometallurgy of precious metals and can be used for recovery of noble metals, in particular gold, containing active chlorine solutions underground and heap leaching, and electroplating wastes

The invention relates to hydrometallurgy heavy non-ferrous metals and can be used to extract copper from waste copper production

The invention relates to hydrometallurgy and can be used for selective extraction of thorium from solutions containing other 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!