Extraction method of uranium in salt lake brine

A technology of salt lake brine and extraction method, which is applied in the field of extraction, can solve problems such as unfavorable environmental protection, and achieve the effects of simple operation, high adsorption capacity, and simple preparation

Active Publication Date: 2016-04-27
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The random discharge of old brine in salt lakes is extremely detrimental to environmental protection, and there is no effective treatment method at present

Method used

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  • Extraction method of uranium in salt lake brine
  • Extraction method of uranium in salt lake brine
  • Extraction method of uranium in salt lake brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for extracting uranium in salt lake brine, comprising the steps of:

[0024] (1) Preparation of silica adsorbent: Add 100mL tetraethyl orthosilicate to 4.6L 5% ammonia water containing 0.5% cetyltrimethylammonium bromide under stirring at 1500 rpm to obtain a solid For precipitation, the precipitate was extracted with ethanol Soxhlet for 48 hours, and then dried at 50°C. The obtained silica adsorbent has a particle size of 0.2 μm, an average pore diameter of 4 nm, and a specific surface area of ​​823 m 2 / g;

[0025] (2) Take 100 L of salt field water with a uranium content of 410 μg / L and a pH value of 6.1, and add 10 g of the silica adsorbent obtained in step (1) into the salt field water. 200 rpm mechanical stirring and adsorption for 10 days, and the filter cake is obtained after solid-liquid separation; the adsorption capacity for uranium is 3.0mg / g;

[0026] (3) Elute the filter cake in step (2) with nitric acid at a concentration of 0.1mol / L as the el...

Embodiment 2

[0034] A method for extracting uranium in salt lake brine, comprising the steps of:

[0035] (1) Preparation of silica adsorbent: Add 100mL tetraethyl orthosilicate to 4.6L 10% ammonia water containing 0.3% cetyltrimethylammonium bromide under stirring at 1000 rpm, A solid precipitate was obtained, and the precipitate was extracted by Soxhlet with ethanol for 36 hours, and then dried at 60°C. The obtained silica adsorbent has a particle size of 0.4 μm, an average pore diameter of 6 nm, and a specific surface area of ​​955 m 2 / g;

[0036] (2) Take 100L of old brine with a uranium content of 208 μg / L and a pH value of 5.7, and add 10 g of the silica adsorbent obtained in step (1) into the old brine. Mechanically stirred at 200 rev / min for 10 days, and a filter cake was obtained after solid-liquid separation; the adsorption capacity for uranium was 1.8mg / g.

[0037] (3) Using 0.5mol / L nitric acid as the eluent to elute the filter cake in step (2) to obtain an eluent containin...

Embodiment 3

[0045] Add 500mL tetraethyl orthosilicate to 2.3L 25% ammonia water containing 0.1% cetyltrimethylammonium bromide under stirring at 1000rpm to obtain a solid precipitate, and extract the precipitate with ethanol Soxhlet After 48 hours, dry at 60°C. The obtained silica adsorbent has a particle size of 0.9 μm, an average pore diameter of 9 nm, and a specific surface area of ​​725 m 2 / g. Under the condition that the ratio of the prepared silica to the salt lake water sample is 0.4g / L and the adsorption time is 5 hours, the adsorption capacities of silica adsorbents for uranium in intercrystalline brine, salt field water and old brine are shown in the table 3.

[0046] Table 3 The adsorption capacity of silica to salt lake brine and uranium

[0047]

[0048] The experimental results in Table 3 show that the silica adsorbent in this method can effectively adsorb uranium in intercrystalline brine, salt pan water and old brine, and under the same experimental conditions, the ...

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Abstract

The invention relates to an extraction method of uranium in salt lake brine. The extraction method comprises the following steps that (1) a self-made silicon dioxide adsorbent is added to the salt lake brine, and a filter cake is obtained after solid-liquid separation is carried out; (2) the filter cake is eluted by 0.1-1mol/L nitric acid acting as an eluting agent; (3) eluting liquid is condensed, and extraction is carried out with an extraction agent under the circumstance that the concentration of nitric acid is adjusted to be 4-6mol/L; and (4) extraction liquid is subjected to reverse extraction with water, drying by distillation is carried out, and uranyl nitrate is obtained. The extraction method is applicable to the acquisition of uranium from intercrystalline brine, salt lake brine and old brine.

Description

technical field [0001] The invention relates to an extraction method, in particular to an extraction method for uranium in salt lake brine. Background technique [0002] With the development of the nuclear industry, my country's demand for uranium continues to increase, but the lack of solid uranium resources cannot meet the needs of the development of the nuclear industry. It is of great strategic significance to develop unconventional uranium resources other than solid uranium ore. The total amount of uranium in seawater can reach 4.5 billion tons, but the uranium concentration is very low, only 3.3 μg / L. The concentration of uranium in many salt lakes is dozens or even hundreds of times that of seawater, which has great potential for development. [0003] During the development of salt lake resources, the method of evaporating salt lake water in the sun is often used to precipitate the required salt. According to different development stages, salt lake brine can be di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B60/02C22B3/24C22B3/38
CPCC22B3/24C22B60/0217C22B3/26
Inventor 殷小杰秦芝白静范芳丽
Owner INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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