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Process for recovering uranium in water through photocatalytic reduction immobilization-electrooxidation enrichment-precipitation separation

A technology of precipitation separation and photocatalysis, applied in electrolysis process, electrolysis components, cells, etc., can solve the problem of high energy consumption

Active Publication Date: 2022-03-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrochemical method has the characteristics of high energy consumption because it needs to be connected to the power supply in the uranium-contaminated water body in the reduction project, and the electric energy needs to be continuously provided during the electrochemical reduction process.

Method used

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  • Process for recovering uranium in water through photocatalytic reduction immobilization-electrooxidation enrichment-precipitation separation
  • Process for recovering uranium in water through photocatalytic reduction immobilization-electrooxidation enrichment-precipitation separation
  • Process for recovering uranium in water through photocatalytic reduction immobilization-electrooxidation enrichment-precipitation separation

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preparation example Construction

[0049] The preparation method of titanium dioxide nano-array of the present invention is as follows:

[0050] The titanium sheet is used as the anode and the inert material is used as the cathode for electrochemical oxidation. The optimum oxidation voltage is 15-20V to obtain the titanium sheet with the titanium dioxide oxide layer on the surface; annealing the titanium sheet with the titanium dioxide oxide layer on the surface is the best. The annealing temperature is 600-750° C., and then ultrasonic cleaning and drying are performed in deionized water to obtain titanium dioxide nano-arrays.

[0051] The invention provides a process of photocatalytic reduction fixation-electrooxidation enrichment-precipitation separation co-production of high-efficiency adsorption reduction, electrooxidation enrichment, precipitation separation and recovery of uranium, including the following three steps:

[0052] Step 1, photocatalytic reduction and fixation of uranium: the photocatalyst gen...

Embodiment 1

[0057] Laboratory simulation: the uranium-containing waste water is drawn from the uranium waste liquid pool 7 by the water pump 6 (the initial concentration of the uranium waste liquid is 0.05mmol / L, pH=5.2), and enters the photocatalytic reactor 2. The catalytic reactor is made of quartz glass, and a fixed photocatalyst 1 (3cm*3cm) is arranged in the photocatalytic reactor. see photos figure 2 , SEM characterization results see image 3 , X-ray diffraction characterization results see Figure 4 ), under the condition of irradiation by the ultraviolet light source 3, photogenerated electrons are generated, and the photogenerated electrons reduce uranium (VI) in water to uranium (IV), and deposit the reduced uranium (IV) on the surface of the titanium dioxide nano-array. The titania nano-array deposited with uranium is moved to the anode chamber 8 of the double-chamber reactor, the double-chamber reactor is made of quartz glass, the electrolyte of the double-chamber reactor...

Embodiment 2

[0060] The uranium-containing waste water is extracted from the uranium waste liquid pool 7 by the water pump 6 (the initial concentration of the uranium waste liquid is 0.05mmol / L, pH=5.2), and enters the photocatalytic reactor 2. The photocatalytic reactor adopts Made of acrylic, the photocatalytic reactor is equipped with a fixed photocatalyst 1 (3cm*3cm), the fixed photocatalyst 1 is a titanium dioxide nano-array (anodized voltage 15V, annealed at 750°C), under the condition of ultraviolet light source 3 irradiation , generating photo-generated electrons, which reduce uranium (VI) to uranium (IV) in water, and deposit the reduced uranium (IV) on the surface of titanium dioxide nano-arrays. The titania nano-array deposited with uranium is moved to the anode chamber 8 of the double-chamber reactor, the double-chamber reactor is made of quartz glass, the electrolyte of the double-chamber reactor is 0.1mol / L sulfuric acid solution, and the cathode 12 of the double-chamber react...

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Abstract

The invention discloses a process for recovering uranium in water by photocatalytic reduction immobilization, electrooxidation enrichment and precipitation separation, which belongs to the technical field of precious metal recovery, and comprises the following three steps: photocatalytic reduction immobilization, electrooxidation enrichment and precipitation separation, and uranium extraction, enrichment, precipitation and recovery are realized by photocatalysis, electrooxidation and precipitation technologies. According to the method, uranium is extracted from the uranium-containing waste liquid through illumination, uranium is enriched through an electrooxidation method, uranium is separated and recycled through a precipitation method, and the methods are mild in condition, low in energy consumption and high in recovery rate, have simple and easily available equipment requirements and have good market prospects.

Description

technical field [0001] The invention relates to the technical field of precious metal recovery, in particular to a process of photocatalytic reduction fixation-electrooxidation enrichment-precipitation separation and recovery of uranium in water. Background technique [0002] Currently, global climate change and the depletion of fossil fuels are prompting more and more countries to develop nuclear energy to ensure their energy security and reduce greenhouse gas emissions. However, for places where fossil energy (coal, oil, natural gas) is scarce, the development of clean energy can not only reduce the dependence on energy imports, improve energy security, but also effectively protect the ecological environment and promote sustainable social and economic development. Nuclear energy is an important clean energy, and its wide application (such as power generation) is a cost-effective measure to alleviate the energy crisis. [0003] Uranium is currently the main fuel for most n...

Claims

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Application Information

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IPC IPC(8): C22B60/02C25B1/01C25B9/19C25B9/50
CPCC22B60/0278C25B1/01C25B9/19C25B9/50Y02P10/20
Inventor 王宇恒秦泽敏叶訚梁艳茹帅文娟李记民
Owner NORTHWESTERN POLYTECHNICAL UNIV
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