RU2646297C1 - Method for obtaining of sorbent for uranium extraction from underground water - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: method involves synthesis of a sorption composition from mechanically activated schungite, calcined phosphogypsum and a modifying solution in a ratio of 1:1:1. The synthesis is carried out by granulation and modification of the sorption composition in one step. A neutral electrolyte with a zinc content of 31.42 g/l is used as the modifying solution.

EFFECT: simplified synthesis process and increased uranium extraction.

1 tbl, 1 ex

Description

The invention relates to the uranium halurgy and can be used when it is extracted from hydromineral and technogenic raw materials, as well as in wastewater treatment of uranium industries.

Known described in the literature [1], the original method of producing sorbents for the extraction of uranium from underground water under dynamic conditions, adopted as an analogue, which consists in granulating mechanically activated shungite at room temperature using phosphogypsum calcined at 300 degrees Celsius as a binder. The result is a granular sorption composition (FGS), suitable for sorption of uranium under dynamic conditions in a columnar version. The disadvantage of the analogue method is the low degree of uranium extraction with the obtained sorbent (see table experiment 1).

Closest to the proposed method is a method for producing a sorption composition consisting of FGS and its subsequent modification with copper and nickel solutions, adopted as a prototype. To remove moisture, phosphogypsum was preliminarily calcined in a muffle furnace at 300 ° C for 1 h. Then, shungite and phosphogypsum were finely ground on a vibrating grinder to create defects in the crystal lattices in order to increase the sorption capacity. Next, mechanically activated phosphogypsum and shungite with a particle size of 0.02 mm were mixed with water in a mass ratio of phosphogypsum: shungite: water equal to 1: 1: 1, and the resulting mixture was granulated by extrusion.

The obtained granules were placed in a glass beaker with a solution of copper (II) nitrates and nickel with a copper concentration of 16 g / dm ³ and nickel 59 g / dm ³ . Then the granules were treated with 5 cm ³ sodium hydroxide solution with a concentration of 200 g / DM ³ for 10 min at room temperature. Next, the remaining solution was poured from the glass by decantation, and the sorbent was placed in a column for sorption of uranium from underground water under dynamic conditions at room temperature. Groundwater was passed through a layer of sorbent at a speed of 7 cm ³ / min. The results of the experiment (see table experiment 2) showed a significant increase in the degree of extraction.

The disadvantages of the prototype method are the complexity of the synthesis process (the presence of two stages of the process), the use of alkali and the relatively low degree of uranium extraction with the obtained sorbent.

The problem to which the invention is directed is the development of a method for producing a sorbent for the extraction of uranium from underground water, which simplifies the synthesis process and increases the degree of extraction of uranium in the sorbent. The technical result from the use of the claimed invention is to simplify the process of obtaining the sorbent and increase its sorption capacity for uranium during sorption from groundwater.

The essence of the claimed invention is as follows. A method for producing a sorbent for the extraction of uranium from underground water is proposed, including the synthesis of a sorption composition from mechanically activated shungite, calcined phosphogypsum and a modifying solution in a mass ratio of 1: 1: 1, characterized in that the granulation and modification of the sorption composition occurs at one stage, and as The modifying solution uses a neutral electrolyte with a zinc content of 31.42 g / l.

An example implementation of the method.

To obtain granules FGSh used a neutral electrolyte (see table experiment 3), which was also a modifying solution. For this, mechanically activated phosphogypsum and shungite with a particle size of 0.02 mm were mixed with a neutral electrolyte in a mass ratio of phosphogypsum: shungite: neutral electrolyte, equal to 1: 1: 1. Next, the resulting mixture was extruded and dried at room temperature. The obtained granular material was used for sorption of uranium from groundwater similarly to experiments on sorption on sorbents analog and prototype (experiments 1 and 2 in the table).

From the data presented in the table, it is seen (experiment 3) that the FGS, upon receipt of which a neutral electrolyte was used, allows almost completely to extract uranium from uranium-containing water used for sorption (by ~ 99%).

Literature

1. Saduakasova A.T., Samoilov V.I., Zelenin V.I., Kulenova N.A. Investigation of the process of sorption of uranium from underground water using shungite, phosphogypsum and products of their modification // Integrated use of mineral raw materials. No. 2. 2016.S. 51-56.

Claims (1)

A method of producing a sorbent for the extraction of uranium from underground water, including the synthesis of a sorption composition from mechanically activated schungite, calcined phosphogypsum and a modifying solution in a mass ratio of 1: 1: 1, characterized in that the synthesis is carried out by granulation and modification of the sorption composition at one stage, and as The modifying solution uses a neutral electrolyte with a zinc content of 31.42 g / L.