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Uranium recovery method for uranium-containing wastewater

A recovery method and wastewater technology are applied in the field of uranium recovery from uranium-containing wastewater, which can solve the problems of easy poisoning of ion exchange resins and difficulty in realizing the recycling of waste uranium resources.

Active Publication Date: 2021-11-19
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Uranium in uranium-containing wastewater exists in the form of uranyl ions complexed with coexisting anions. The actual treatment of uranium-containing wastewater in uranium mines often uses weakly basic anion exchange resins to capture and fix uranyl ions and anion complexes. Although it has uranium retention efficiency High selectivity, but there are problems such as easy poisoning of ion exchange resins. In addition, this treatment method is difficult to realize resource recovery of waste uranium resources

Method used

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  • Uranium recovery method for uranium-containing wastewater
  • Uranium recovery method for uranium-containing wastewater
  • Uranium recovery method for uranium-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] A method for recovering uranium from wastewater containing uranium, comprising:

[0075] S1. Test the uranium concentration and pH value of uranium-containing wastewater; use nitric acid with a concentration of 2mol / L to adjust the pH value of uranium-containing wastewater to 3; The molar ratio of the body and the uranyl ion is a ratio of 3:1, and the organic ligand of the uranyl ion is added to the uranium-containing wastewater and mixed to obtain the liquid to be treated; the pH value of the liquid to be treated is adjusted to 6.5, and the liquid 5%) as the electrolyte, the iron electrode as the anode, and the graphite electrode as the counter electrode, and the liquid to be treated is electrocoagulated to obtain uranium-removing wastewater and uranium-containing precipitation.

[0076] S2. Dry the uranium-containing precipitate in an oven at 40°C to constant weight; use a solution with a concentration of 0.5mol / L of sodium carbonate and a concentration of 0.5mol / L of...

Embodiment 2

[0079] A method for recovering uranium from waste water containing uranium, which differs from Example 1 in that step S1 is specifically:

[0080] S1. Test the uranium concentration and pH value of uranium-containing wastewater; use nitric acid with a concentration of 1.5mol / L to adjust the pH value of uranium-containing wastewater to 3; The molar ratio of ligand and uranyl ion is the ratio of 2.5:1, and uranyl ion organic ligand is added in uranium-containing wastewater and mixed to obtain the liquid to be treated; the pH value of the liquid to be treated is adjusted to 6.7, and sodium sulfate (mass The concentration is 5%) as the electrolyte, the iron electrode as the anode, and the graphite electrode as the counter electrode, and the liquid to be treated is subjected to electrocoagulation treatment to obtain uranium-removing wastewater and uranium-containing precipitation.

Embodiment 3

[0082] A method for recovering uranium from waste water containing uranium, which differs from Example 1 in that step S1 is specifically:

[0083] S1. Test the uranium concentration and pH value of uranium-containing wastewater; use nitric acid with a concentration of 2.5mol / L to adjust the pH value of uranium-containing wastewater to 2.8; The molar ratio of ligand and uranyl ion is the ratio of 3.5:1, and uranyl ion organic ligand is added in uranium-containing wastewater and mixed to obtain the liquid to be treated; the pH value of the liquid to be treated is adjusted to 6.4, and sodium sulfate (mass The concentration is 5%) as the electrolyte, the iron electrode as the anode, and the graphite electrode as the counter electrode, and the liquid to be treated is subjected to electrocoagulation treatment to obtain uranium-removing wastewater and uranium-containing precipitation.

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Abstract

A method for recovering uranium from uranium-containing wastewater belongs to the technical field of water treatment. The uranium recovery method of uranium-containing wastewater includes: under the condition that the pH value is not higher than 3, mixing the uranium-containing wastewater with the uranyl ion organic ligand to obtain the liquid to be treated, and under the acidic condition with a pH value of not lower than 3, treating The treatment solution is electrocoagulated to obtain uranium-removing wastewater and uranium-containing precipitates. The uranium-containing precipitate is soaked in the washing liquid to obtain the washed uranium-removing precipitate and the uranium-containing concentrated liquid, and the uranium-containing concentrated liquid is heated and digested with concentrated nitric acid to obtain the uranium-containing residue, and the washing liquid contains sodium carbonate and hydrogen peroxide. The uranium-containing residue was reacted with an ammonia source for 1.5-2.5 hours in a solution environment with a pH value of 8-9.8 to obtain ammonium diuranate precipitation. It can efficiently and selectively remove low-concentration uranium in uranium-containing wastewater, and at the same time realize resource recovery of uranium.

Description

technical field [0001] The present application relates to the technical field of water treatment, in particular to a method for recovering uranium from wastewater containing uranium. Background technique [0002] Because of its cleanliness, high efficiency and low carbon, nuclear power has become the main energy supply strategy for the priority development of various countries. The vigorous development, promotion and use of nuclear power will inevitably increase the demand for its main fuel - natural uranium. At present, natural uranium mainly comes from terrestrial mineral uranium resources. The mining and processing of terrestrial uranium resources produces a large amount of uranium-containing wastewater, which seriously threatens the health of residents and the sustainable development of the ecological environment where uranium mines are located. The uranium-containing wastewater produced by the exploitation of terrestrial mineral uranium resources mainly comes from mine ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C22B7/00C22B60/02
CPCC02F1/463C02F1/66C02F9/00C02F2001/007C02F2101/006C22B7/006C22B60/0278Y02P10/20
Inventor 李鹏王学刚孙占学王光辉王立章蒋浩
Owner EAST CHINA UNIV OF TECH