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Device and method for removing uranium in low-concentration uranium-containing wastewater by alternate double-anode mineralization

A dual-anode, alternating technology, used in radioactive purification, nuclear engineering, etc., can solve problems such as mineralization time limitation, and achieve the effect of promoting oxidation, high reaction rate, and high reaction rate.

Active Publication Date: 2021-06-18
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the long 1-25d mineralization time of hematite and goethite limits the practical application. In contrast, the mineralization time of magnetite generally only needs 24h

Method used

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  • Device and method for removing uranium in low-concentration uranium-containing wastewater by alternate double-anode mineralization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 0.2mg / L low-concentration uranium-containing solution into the dual-anode electrochemical reaction system, use iron powder gel coagulation block and graphite as double anode material, and magnetic iron tetroxide powder and carbon mixed gel coagulation block as cathode material. Under the condition of a voltage of 10V, first energize the anode of the iron powder gel solidified block for 5 minutes. At this time, a large amount of ferrous ions are generated in the solution, then disconnect the anode of the iron powder gel solidified block, and then use graphite anode to energize for 10 seconds. At this time The anode graphite generates oxygen to convert a part of the ferrous ions into ferric ions. The double anode cycle is alternately energized for 1h, and the iron ions in the wastewater crystallize on the cathode plate to form magnetic ferric oxide, and simultaneously control the uranium into ferric oxide. Iron lattice, so as to achieve the purpose of removing uranium ...

Embodiment 2

[0040] Add 10mg / L low-concentration uranium-containing solution into the double-anode electrochemical reaction system, use iron powder gel coagulation block and graphite as double anode material, and the mixed gel block of magnetic iron tetroxide powder and carbon as cathode material. Under the condition of a voltage of 12V, first energize the anode of the iron powder gel coagulation block for 8 minutes. Graphite generates oxygen to convert part of the ferrous ions into ferric ions. The double anode cycle is alternately energized for 1.2 hours. The iron ions in the wastewater crystallize on the cathode plate to form magnetic ferric oxide, and simultaneously control the uranium into ferric oxide. Iron lattice, so as to achieve the purpose of removing uranium in wastewater, and the removal rate of uranium is 93.8%.

Embodiment 3

[0042] Add 20mg / L low-concentration uranium-containing solution into the double-anode electrochemical reaction system, use iron powder gel coagulation block and graphite as double anode material, and the mixed gel block of magnetic iron tetroxide powder and carbon as cathode material. Under the condition of a voltage of 15V, first energize the anode of the iron powder gel coagulation block for 10 minutes. Graphite generates oxygen to convert part of the ferrous ions into ferric ions. The double anode cycle is alternately energized for 1.5 hours. The iron ions in the wastewater crystallize on the cathode plate to form magnetic ferric oxide, and simultaneously control the uranium into ferric oxide. Iron lattice, so as to achieve the purpose of removing uranium in wastewater, and the removal rate of uranium is 93.5%.

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Abstract

The invention discloses a method for removing uranium in low-concentration uranium-containing wastewater by alternate double-anode mineralization. An electrochemical reaction system is constructed, the electrochemical reaction system comprises double anodes and a single cathode, the double anodes respectively adopt an iron powder gel solidified block and graphite, the cathode adopts a mixed gel solidified block of magnetic ferroferric oxide powder and carbon. The iron powder gel solidified block anode provides iron ions required for treating uranium-containing wastewater, oxidation of the iron ions in a solution is promoted by alternately controlling the graphite anode to provide oxygen and transfer electrons, the iron ions in the wastewater are accurately controlled to crystallize on the cathode plate to form magnetic ferroferric oxide, and uranium is synchronously controlled to enter ferroferric oxide lattices, and therefore, the purpose of removing uranium in the wastewater is achieved. The method has the advantages of simple equipment, convenience in operation, no secondary pollution and high removal efficiency.

Description

technical field [0001] The invention relates to the technical field of uranium-containing wastewater treatment, in particular to a device and a method for removing uranium in low-concentration uranium-containing wastewater by alternating double anode mineralization. Background technique [0002] As an important raw material in the nuclear industry, uranium has a long half-life and strong ion mobility, which has brought serious radioactive pollution to the environment during the mining, extraction, purification and utilization of uranium. Uranium usually exists in the aquatic environment in the form of highly soluble U(VI). Reducing soluble U(VI) to insoluble U(IV) for precipitation and using artificially synthesized adsorption materials to separate uranium from wastewater are the main methods for treating uranium-containing wastewater. However, the secondary migration pollution caused by the reoxidation of U(IV) in complex environments and the final safe disposal of radioab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/06
CPCG21F9/06
Inventor 李密符丁蜜张晓文吴晓燕苏玲滑熠龙蔡涛
Owner NANHUA UNIV