RU1835403C - Technique of production of ionite - Google Patents

Abstract

Usage: the allocation and the end of the centering of metals from solutions and pulps. The essence of the invention: obtaining a polymer matrix by copolymerization of nitrile, acrylic acid, divinylbenzene and 5 vinyl-o4-picoline with a molar ratio of (1-2): (O, 2--0.3) s (), respectively, followed by phospholation of the oxidized matrix phosphorus trichloride. 3 tab.

Description

The invention relates to methods for producing ion exchangers, which can be used in hydrometallurgy to isolate and concentrate metals from solutions and pulps

A method for producing a complex-forming ion exchanger is known, which consists in obtaining a polymer matrix followed by the introduction of ionogenic groups.

The obtained ion exchanger does not have a sufficiently high complexing ability with respect to scandium ions.

Waste from the production of aluminum from bauxite is red sludge containing 0.001-0.01% scandi. Almost all of Scandium is concentrated in red mud, which is dumped and is not processed anywhere in the world. Given the large scale production of alumina, it is of interest to extract scandium from bauxite and its processed products. Thus, the proposed ion exchanger will partially solve some environmental problems.

The aim of the invention is to increase the sorption capacity of ion exchange resin for scandium from red mud.

The goal is achieved in that the polymer matrix is obtained by copolymerization of nitrile of acrylic acid, divinylbenzene and 5-vinyl-cЈ-picoline with their molar ratio (1-2): (0.2-0.3) :( 1 -2), respectively, followed by phosphorylation. oxidized matrix with phosphorus trichloride.

The described method eliminates a large amount of harmful organic leaching organic solvents used in the prototype for washing the ion exchanger from pyridine, which simplifies the technology and improves the ecology of the process. Pyridine nitrogen 5

 No.

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ate

8inyl-pi | olene exerts a catalytic effect during the phosphorylation reaction and additionally participates in complexation along with the phosphate group. The resulting ion exchanger contains two types of ionogenic. .. of pyridine and phosphonic acid groups such a compound thereof provides an increase in sorption capacity for scandium in the processing of solutions or pulps with a low content thereof, especially from red mud

SI

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-P-OH;

CHON;

Example 1 “In a 500 ml reactor equipped with a stirrer and a reflux condenser, 250 ml of a 1 starch solution are charged, the temperature is raised to 50 ° C and, with the stirrer operating, a polymerization mixture consisting of 5.2 ml of acrylic acid nitrile is loaded, 13 , 5 ml of technical divinylbenzene, 5 ml of vinyl-oh-picoline, 2.5 g of benzoyl peroxide), 3 & ml of alkylbenzene „The molar ratio is 10: 0.3: 2, respectively

I.

The mixture is heated according to the following temperature conditions:

Temperature rise

up to 80 ° С1.5h

Exposure at 80vC 3.0 h

Temperature rise to

90 ° C. 0.5 h:

Exposure at 90 ° C 2.0 h

0

5

0

5

0

g

about

Then the ion exchanger is squeezed out, washed with water, dispersed into a fraction of 0.63-1.6 mm

50 g of a copolymer and 300 ml of 30% nitric acid are charged into a reactor equipped with a stirrer and a reflux condenser. The mixture is heated for 30 h at 90 ° C. After the end of the process, the reaction mass is cooled, the resin is washed with water to pH 2-k, water squeezed out, phosphorylation is carried out in a known manner. “0 ml of chlorobenzene is added to the washed sorbent, then 100 ml of phosphorus trichloride is portioned with a working stirrer. Phosphorylation is carried out at 70 ° C for 5 hours. Yield 65 g.

Example 2. The same 0 The molar ratio of acrylic acid nitrile, divinylbenzene and 5-vinyl-OC-picoline is 1.0: 0.2: 2.

Example 3. The same. The molar ratio of nitrile of acrylic acid 9 divinylbeneoyl to 5 vinyl-o6-picolin is 2: 0.2: 1

Example ka Scandi is sorbed from red alumina slurries containing 6, -006% Sc at pH 1.3. The ratio of the mass of the resin (g) and the volume of the solution (ml) is 1: 5 Contact time 2 h

Example 5 “Isotherm of sorption of scandi from red mud. The sorption capacities of the sorbents were determined depending on the content of scandium in the initial solution. Contact time 2k h. The ratio of T: W 1: 5, pH 1.3.

In the table. 1 shows the physicochemical properties of ion exchangers obtained by the proposed method.

I

Table 1

The obtained ion exchangers have advantages over the prototype in terms of their physicochemical properties.

In the table. Figure 2 shows the values of sorption capacities according to scandium during the joint extraction of aluminum according to Example 4.

In the table. Figure 3 shows the numerical values of the sorption isotherm of scandi from red mud with a low content, i

Table 3 Sorption scandi from red mud

.. Using the proposed method allows us to synthesize sorbents with higher sorption characteristics for the extraction of scandium from alumina production waste - red mud.

Claims (1)

The claims 25 20 A method for producing ion exchanger, which consists in obtaining a polymer matrix followed by the introduction of ionic groups, characterized in that, in order to increase the sorption capacity for scandium, the polymer matrix is obtained by copolymerization of acrylate nitrile, divinylbenzene and 5-vinyl ogpicolin, in a molar ratio of 1 -2: 0.2-0.3: 1-2, respectively, followed by oxidation and phosphorylation of the oxidized matrix with phosphorus trichloride.