Method of recovering metal ions from aqueous solutions

FIELD: hydrometallurgy.

SUBSTANCE: invention relates to recovering metal ions from aqueous solutions with the aid of clay minerals and can find use in nonferrous and ferrous metallurgies as well as in waste water treatment. Essence of invention resides in adding clay materials to solution in question followed by stirring and settling. Recovery of cations is effected at pH 2.6 to 10 over a period of time not exceeding 120 min and recovery of anions at pH 1 to 4 during at most 30 min. Clay minerals utilized are sea-origin hydromicas Irilit-1 and Irilit-7.

EFFECT: enhanced of metal ions recovery efficiency, reduced expenses due to use of non-costly sorbents, and reduced consumption of reagents.

2 cl, 3 tbl, 5 ex

 

The invention relates to the extraction of heavy metal ions from aqueous solutions clay minerals Irlit-1 and Irlit-7 and can be used in non-ferrous, ferrous metallurgy and industrial wastewater treatment.

The known method of sorption extraction of metal ions from solutions of clay minerals, including the preparation of the starting solution and the sorbent, the contact solution and the sorbent, and the preparation of the starting solution includes the creation of acid-base characteristics of the solution, and the preparation of the sorbent is activated under hydrothermal conditions 10% solutions of alkali or acid at a temperature of 105-110° C. the consumption of bentonite clay was 10-20 g/DM3[see proceedings “kazmekhanobr”, Circulation, treatment of industrial wastewater and operation of tailings. Alma-ATA, publ. 1983, s-97].

The disadvantages of the method is the high consumption of sorbent and reagents, as well as removing heavy metal ions of the less concentrated solutions.

Closest to the claimed technical solution is to clean from water solutions of metal ions bentonitovykh clays, including the introduction of clay materials in the original solution, followed by stirring and settling [see RF patent №2106415, IPC722 In 3/44, 15/00, 19/00, publ. 10.03.98,].

The disadvantages of protot the PA are removing metal ions only of the less concentrated solutions, substantial consumption of reagents by regulating the acid-base characteristics of the initial solution and in the process of sorption.

The task of the invention is to increase the efficiency of extraction of heavy metal ions from aqueous solutions, cost reduction process through the use of readily available and low-cost sorbents and reduced reagent consumption.

The technical result consists in expanding the range of concentration of the original solution by ions of metals.

The technical result is achieved in that in the method of extracting metal ions from their aqueous solutions, including the introduction of clay materials in the original solution, sorption under stirring and decanting, according to the invention as clay materials used gidrologiya clay of marine origin, Irlit-1 and/or irilit-7, the extraction of cations of heavy metals is carried out at a pH equal to (2,6÷ 10), and removing anions - at pH equal to (-1÷ 4). Removing cations is carried out for not more than 120 minutes, and anions is not more than 30 minutes.

This method will increase the efficiency of extraction of metal ions from a source solution for a wide range of concentrations, to exclude the consumption of reagents to reduce the time of sorption process and to use more affordable and low-cost sorbents.

p> Gidrologiya clay of marine origin Irlit-1 and Irlit-7 contain clay minerals - kaolinite, montmorillonite, glauconite, hidromorava and Neglinnaya minerals - quartz, feldspar, rutile, phosphates, carbonates and others; oxides of iron, aluminium, silicon, calcium, potassium, magnesium, sodium and organic matter.

The essence of the method is illustrated: table 1, which presents the results of the extraction of metal ions from solutions of their salts; table 2, which shows the pH value of an aqueous solution obtained by contact of distilled water with iritani with a concentration of 0.5 g/DM3and table 3, which shows the chemical composition of erlitou.

Sorption was carried out from aqueous solutions of salts of heavy metals, sulphates, chlorides, nitrate, acetate, wolframates, molybdates with the original concentration of the solution to 1.5 g/DM3. For the preparation of initial solutions used salt brand CHP. As the sorbent used Irlit-1 and/or Irlit-7. The results of the extraction of metal ions from aqueous solutions shown in table 1 presents the values of pH of the initial solutions, the distribution coefficient K, defined as the ratio of metal in the sorbent and in the aqueous phase and removing the R.

Extraction of metal cations at pH<2,6 does not occur, and at pH>10,0 retrieving C is acetelyne worse.

Examples of specific implementation method

Example 1 for copper cations using Irlit-1. In the original solution of sulphate of copper (II) concentration 0,689 g/DM3on ion copper (II) at pH=6 was administered 2.5 g/DM3Irlit-1, the solution was stirred for 60 minutes In a clarified aqueous phase was determined by the residual concentration of copper ion (II), which was 0.0001 g/DM3the distribution coefficient K=55120, removing P=100%.

Example 2 for anions tungstate ions (VI) using Irlit-1. In the original solution of sodium tungstate concentration 0,184 g/DM3by Jonah tungsten (VI) at pH=2 was administered 5 g/DM3Irlit-1, the solution was stirred 30 minutes In the clarified aqueous phase was determined by the residual concentration of the tungsten (VI), which was 0,024 g/DM3the distribution coefficient K=266,67, removing P=86,96%.

Example 3 for cations of lead (II) using Irlit-7.

In the original nitrate solution lead (II) concentration 0,570 g/DM3on ion lead (II) at pH=5 was administered 5 g/DM3Irlit-7, the solution was stirred 30 minutes In the clarified aqueous phase was determined by the residual ion concentration of lead (II), which was 0,365 g/DM3the distribution coefficient K=22,47, removing P=35,96%.

Example 4 for anions tungstate ions (VI) using Irlit-7. In the original solution of sodium tungstate concentration 0230 g/DM 3by Jonah tungsten (VI) at pH=3 was administered 5 g/DM3Irlit-7, the solution was stirred for 15 minutes a clarified aqueous phase was determined by the residual concentration of the tungsten (VI), which was 0,106 g/DM3the distribution coefficient K=46,79, removing P=53,91%.

Example 5 for cations of copper (II) using Irlit-1 and Irlit-7. In the original solution of sulphate of copper (II) concentration 1,370 g/DM3on ion copper (II) at pH of 4.9 was introduced g/DM3the mixture Irlit-1 and Irlit-7 in the ratio of 1:1, the solution was stirred for 120 minutes In a clarified aqueous phase was determined by the residual concentration of copper ion (II), which was 0,554 g/DM3the distribution coefficient K=58,92, removing P=59,56%.

The use of the invention in comparison with the prototype will allow you to:

- remove metal ions from solutions with a wide range of metal ion concentration of 0.10≥ CRef1.5 g/DM3;

- to carry out the extraction of metal ions in a large range of pH of the initial solutions -1≥ pH≥ 10;

- to carry out the process of sorption without regulating the pH of the solution;

- to carry out the neutralization of acidic and alkaline solutions when using Irlit-1 and/or Irlit-7.

All this leads to increased efficiency of extraction of metal ions from aqueous solutions, cost reduction process due to the COI is whether cheap sorbent and reduce reagent consumption.

The method of extraction of heavy metal ions...

The pH of the aqueous solution in contact with iritani with a concentration of 0.5 g/DM3.

1. The method of extraction of metal ions from their aqueous solutions, including the introduction of clay materials in the original solution, sorption under stirring and decanting, characterized in that as the clay materials used gidrologiya clay of marine origin Irlit-1 and/or Irlit-7, the extraction of cations of heavy metals is carried out at pH of 2.6 to 10.0, and removing anions is carried out at a pH equal to (-1,0÷4,0).

2. The method according to claim 1, characterized in that the extraction of cations is carried out for not more than 120 min, and anions of not more than 30 minutes



 

Same patents:

FIELD: extraction of agent by means of sorbents; ferrous and non-ferrous metallurgy; cleaning domestic and industrial drainage passages; processing wastes of non-ferrous metals containing (VI) tungsten.

SUBSTANCE: proposed method includes sorption of (VI) tungsten on macroporous anionite at correction of ph ≤ 5. Prior to sorption, anionite is treated with water, acid solution or alkali solution.

EFFECT: enhanced efficiency.

6 dwg, 6 tbl, 6 ex

The invention relates to ferrous metallurgy and can be used for processing tungsten-tin concentrates, obtaining calcium tungstate and tin compounds

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

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

The invention relates to hydrometallurgy, in particular to the processing of molybdenum concentrates and waste

The invention relates to the beneficiation of minerals and can be used to extract the oxidized molybdenum in the processing of mixed molybdenum ores

The invention relates to the field of waste

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

FIELD: extraction of agent by means of sorbents; ferrous and non-ferrous metallurgy; cleaning domestic and industrial drainage passages; processing wastes of non-ferrous metals containing (VI) tungsten.

SUBSTANCE: proposed method includes sorption of (VI) tungsten on macroporous anionite at correction of ph ≤ 5. Prior to sorption, anionite is treated with water, acid solution or alkali solution.

EFFECT: enhanced efficiency.

6 dwg, 6 tbl, 6 ex

Up!