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Catalyst for extracting and separating uranium in uranium-containing wastewater or seawater and application of catalyst

A catalyst and wastewater technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of oxidation and redissolution of extracted uranium, affecting the efficiency of photocatalytic reduction, reoxidation of uranium reduction products, Dissolution and other problems, to achieve the effect of good cycle performance

Active Publication Date: 2022-05-31
NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the photocatalytic method can only occur under light, and the photocatalytic reduction of uranium cannot be carried out at night when there is no light, and it is easy to cause re-oxidation and dissolution of uranium reduction products, which affects the photocatalytic reduction efficiency.
[0003] To sum up, the problems existing in the existing photocatalytic uranium extraction technology are: the existing uranium photocatalytic reduction technology must be driven by light, and the uranium catalytic reduction cannot be continued in the dark, and it is easy to cause the oxidation of the extracted uranium. and redissolve
All in all, the current existing technologies are still difficult to achieve the continuous photocatalytic reduction of uranium under light and darkness, so as to achieve the purpose of extracting uranium from seawater day and night

Method used

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  • Catalyst for extracting and separating uranium in uranium-containing wastewater or seawater and application of catalyst
  • Catalyst for extracting and separating uranium in uranium-containing wastewater or seawater and application of catalyst
  • Catalyst for extracting and separating uranium in uranium-containing wastewater or seawater and application of catalyst

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Effect test

Embodiment 1

[0047] The present embodiment provides a catalyst for extracting and separating uranium in uranium-containing wastewater or seawater, which is prepared by the following steps:

[0048] According to the mass ratio of 1:2:6, the corresponding masses of carbon nitride, potassium thiocyanate and potassium chloride were respectively weighed, and then mixed uniformly by grinding and then placed in a quartz boat and placed in a tube furnace at 8°C. The temperature was raised to 550 °C at a rate of / min and kept for 4 h to obtain a light yellow solid catalyst precursor;

[0049] Then the catalyst precursor was ground into powder, and the ground catalyst precursor was washed several times with ultrapure water until no K was detected in the washing solution after washing. + , and then washed the ground catalyst precursor with anhydrous ethanol several times to wash away alcohol-soluble impurities in the catalyst precursor, thereby reducing the influence of other substances on the cataly...

Embodiment 2

[0051] The present embodiment provides a catalyst for extracting and separating uranium in uranium-containing wastewater or seawater, which is prepared by the following steps:

[0052] According to the mass ratio of 1:3:5, the corresponding masses of carbon nitride, potassium thiocyanate and potassium chloride were respectively weighed, and then mixed uniformly by grinding and then placed in a quartz boat and placed in a tube furnace at 8°C. The temperature was raised to 550 °C at a rate of / min and kept for 4 h to obtain a light yellow solid catalyst precursor;

[0053] Then the catalyst precursor was ground into powder, and the ground catalyst precursor was washed several times with ultrapure water until no K was detected in the washing solution after washing. + , and then washed the ground catalyst precursor with anhydrous ethanol several times to wash away alcohol-soluble impurities in the catalyst precursor, thereby reducing the influence of other substances on the catalyti...

Embodiment 3

[0055] The difference between this embodiment and Embodiment 1 is:

[0056] In this embodiment, the mass ratio of carbon nitride, potassium chloride and potassium thiocyanate is 1:1:4.

[0057] In this embodiment, the holding temperature is 500°C, the holding time is 5h, and the heating rate is 5°C / min.

[0058] In this embodiment, the vacuum degree of the freeze-drying treatment is below 10 Pa, the treatment temperature is -15 to -5° C., and the treatment time is 8 to 16 h.

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Abstract

The invention belongs to the technical field of new energy development, and discloses a catalyst for extracting and separating uranium in uranium-containing wastewater or seawater and application thereof.The catalyst is prepared through the following steps that after carbon nitride, potassium chloride and potassium thiocyanate are ground and mixed to be uniform, heat preservation is conducted for 3-5 h at the temperature of 500-600 DEG C, and a catalyst precursor is obtained; washing the catalyst precursor with clear water and an alcohol solution in sequence to wash salt and impurities on the surface of the catalyst precursor to obtain a washed catalyst precursor; and carrying out freeze drying treatment on the catalyst precursor to obtain the catalyst. The catalyst is good in cycle performance, uranium can be continuously separated from the water body through the separation method, only sunlight is needed in the whole process, and the method is environmentally friendly, sustainable and free of pollution.

Description

technical field [0001] The invention relates to the technical field of new energy development, in particular to a catalyst for extracting and separating uranium-containing wastewater or uranium in seawater and its application. Background technique [0002] The development and utilization of uranium resources are of great significance to the sustainable development of nuclear energy. However, proven terrestrial uranium resources are limited. Global seawater contains about 4.5 billion tons of uranium, thousands of times the known terrestrial uranium resources. At present, the most widely studied method for extracting uranium from seawater is mainly adsorption method, but this method has poor selectivity, low extraction efficiency, difficult elution and high cost. The photocatalytic method proposed in recent years provides a new idea for the separation and extraction of uranium in water. The photocatalytic method has the advantages of green, high efficiency, high selectivity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/26B01J37/08B01J37/06C22B7/00C22B60/02
CPCB01J27/26B01J37/08B01J37/06C22B60/0278C22B7/006B01J27/24B01J27/10B01J35/19B01J35/39Y02P10/20
Inventor 李平范桥辉王晶晶梁建军
Owner NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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