A method of obtaining a complexing ion exchanger

 

(57) Abstract:

Usage: getting complexing resins for use in analytical chemistry and in hydrometallurgy for the extraction of platinum metals. The inventive condensation of melamine with formaldehyde in aqueous solution in the presence of an alkaline agent, followed by the introduction of acid agent and curing the condensation products. The condensation is carried out in the presence of a heterocyclic amine with a molar ratio of melamine, formaldehyde and a heterocyclic amine, equal 1 : (3 - 5) : (2 - 4). The cured products of the condensation is carried out at 150 - 160S. As the heterocyclic amine used 3(5)-methylpyrazole, imidazole, benzimidazole. 1 C. p. F.-ly, 2 tab.

The invention relates to methods for complexing ion exchangers designed for the recovery of precious metals from solutions, and can be used in analytical chemistry and in hydrometallurgy for the extraction of platinum metals from solutions.

A method of obtaining soluble oligomers having complexing properties [1] . Synthesis of oligomers is carried out by polycondensation of kinomechanika, aldehyde and timachev the (guanidine) to 38.8%, pre-neutralized formalin solution. The condensation is carried out in the course of 2 hours Obtained by this method oligomers can be used for the deposition of precious metals from solutions, however, along with the noble metals are deposited also many heavy metals, which reduces the selectivity of the extraction. In addition, the process of extracting metals volumes of solutions and the time spent on precipitation, sedimentation and filtration.

A method of obtaining the anion exchange resin by condensation of melamine with formaldehyde in aqueous solution in two stages with the introduction of the first stage alkaline agent to a pH of 7-8 [2] . The condensation is carried out at 68-72aboutC. After dissolution of the melamine mass is then cooled to 57aboutWith and condensation continue in the presence of an acid agent, which is used as a mixture of sulfuric and hydrochloric acids. The mixing ratio melamine: H2SO4: HCl= = (0,9-1,1): (0,4-0,6): 1. The obtained polymer utverjdayut 1-42 h at 90aboutC, crushed, washed and dried. The resulting anion exchange resin characterized by a high dynamic capacity in relation to the anions, osmotic stability and mechanical strength. Sorption properties of anion exchange resin obtained by this spamrazer polycondensation of the resin type, with complexing ability and high selectivity with respect to the platinum group metals, the production and application of which may be technologically and economically feasible. The task is relevant in connection with the problem of extracting platinum group metals from industrial and waste solutions in the hydrometallurgical processing of platypodinae raw materials.

According to the invention, it is proposed a method of obtaining a complexing ion exchanger through co-condensation of melamine and heterocyclic amine containing group of the pyrazole or imidazole with formaldehyde in aqueous solution when heated in the presence of an alkaline agent, followed by the introduction of acid agent and curing the resulting product at 150-160aboutC, washing with water and drying. Melamine, formaldehyde and heterocyclic amine take in a molar ratio of 1: (3-5): (2-4). As the heterocyclic amine used 3(5)-methylpyrazole, imidazole, benzimidazole.

Thus obtained ion exchanger contains links melamine and heterocyclic amine, which is confirmed by the presence of characteristic bands in the IR spectra of diffuse reflection, responsible fluctuations is SUP> for benzimidazole.

Sorption materials obtained by the proposed method are products of light-yellow color, stable in acid and alkaline solutions on cold and when heated, and can be used for sorption extraction of platinum metals in powder form or in the form of fibrous materials, is full of these polymers. The sorption capacity (mg/g) complexing resins obtained by the proposed method are given in table. 1.

The sorption capacity of ion-exchange resin (mg/g) determined from R-RA 1M Hcl. The metal concentration of 4 g/L.

Obtained by the proposed method, the ion exchangers are characterized by selective sorption extraction of platinum metals from acidic solutions: the allowable concentration of copper (II) and iron (III) in solutions of 50 g/l Balance by sorption of platinum metals from 1M Hcl achieved within 30-40 minutes

P R I m e R 1. In a reactor equipped with a stirrer and a thermometer, dissolve 6.3 g of melamine in 13.5 ml of 30% aqueous formaldehyde solution at 70-80aboutC and pH 8.5-9. Add to 16.4 ml of 3(5)-methylpyrazole and heated at the same temperature under stirring for 10-15 min, then the mixture is cooled to 60-65aboutC and add 10 ml of the form is the temperature of 150-160aboutC for 6-8 h

P R I m m e R 2. In the reactor dissolve 6.3 g of melamine in 13.5 ml of 30% aqueous formaldehyde solution at 70-80aboutC and pH 8.5-9, and then to the solution was added 6.8 g of imidazole and stirred at this temperature for 10-15 minutes Then proceed as in example 1. The content in the product: C to 38.8% ; N, 5.2%, Respectively ; S is 33.8% . The degree of swelling in 1M Hcl 170% .

P R I m e R 3. In a reactor equipped with a stirrer and a thermometer, dissolve 6.3 g of melamine in 13.5 ml of 30% aqueous formaldehyde solution at 70-80aboutC and pH 8.5-9, and then to the solution was added 11.8 g of benzimidazole and stirred at the same temperature for 10-15 minutes Then proceed as in example 1. The content in the product: From 46.9% ; N 5,1% ; S 31,5% . The degree of swelling of 160% .

Sorption properties of the products obtained relative to the platinum metals are given in table. 2.

1. A method of OBTAINING a COMPLEXING ion exchanger by condensation of melamine with formaldehyde in aqueous solution in the presence of an alkaline agent, followed by the introduction of acid agent and curing the condensation products, characterized in that the condensation is carried out in the presence of a heterocyclic amine containing group of the pyrazole or imidazole, in a molar ratio of melamine, formaldehyde and a heterocyclic amine, R is audica fact, as a heterocyclic amine used 3(5)-methylpyrazole, imidazole or benzimidazole.

 

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