A method for recovering uranium in acidic ammonium nitrate-containing uranium-containing wastewater

A recovery method and ammonium nitrate technology are applied in the field of uranium-containing wastewater treatment and can solve problems such as inability to meet demand

Active Publication Date: 2018-05-18
THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The uranium purification and conversion production line using U3O8 as raw material is a relatively mature process. When the raw material is replaced with ADU as the raw material for uranium purification and conversion production, it is bound to produce acidic uranium-containing and ammonium nitrate-containing wastewater, which is processed by the existing extraction method. Dealing with unsatisfactory needs

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  • A method for recovering uranium in acidic ammonium nitrate-containing uranium-containing wastewater

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Embodiment 1

[0034] Such as figure 1 Described, a kind of method for recovering uranium in acidic ammonium nitrate-containing uranium-containing wastewater of the present invention, it comprises the steps:

[0035] (1) The acidic ammonium nitrate-containing uranium-containing wastewater from uranium purification and conversion is mixed with sodium hydroxide solution to form an extraction stock solution with an acidity of 0.5mol / L;

[0036] The components of the acidic ammonium nitrate-containing uranium-containing wastewater include: [U]=4g / L, [HNO 3 ]=3mol / L, [NH 4 NO 3 ]=500g / L;

[0037] The mass percentage of described sodium hydroxide solution is 40%;

[0038] (2) extract the stock solution of step (1) gained and the TBP-hydrogenated kerosene extractant (30% tributyl phosphate+70% hydrogenated kerosene) of 30% by volume percentage to extract; Phase flow ratio 1:4;

[0039] (3) After the extraction, the loaded organic phase can be sent to the uranium purification conversion extrac...

Embodiment 2

[0041] Such as figure 1 Shown, the recovery method of uranium in a kind of acidic ammonium nitrate-containing uranium-containing wastewater of the present invention, it comprises the steps:

[0042] (1) The acidic ammonium nitrate-containing uranium-containing wastewater from uranium purification and conversion is pumped to the waste liquid storage tank for temporary storage;

[0043] The components of the acidic ammonium nitrate-containing uranium-containing wastewater include: [U]=4g / L, [HNO 3 ]=3mol / L, [NH 4 NO 3 ]=500g / L;

[0044] (2) When the wastewater described in step (1) is treated, it is pumped into the seasoning tank;

[0045] (3) use solid sodium hydroxide and deionized water preparation mass percent in the alkali preparation tank to be 40% sodium hydroxide solution, this sodium hydroxide solution is also pumped in the seasoning tank, and step (2) described The waste water is prepared into an extraction stock solution with an acidity of 0.5mol / L;

[0046] (4)...

Embodiment 3

[0052] Such as figure 1 Described, a kind of method for recovering uranium in acidic ammonium nitrate-containing uranium-containing wastewater of the present invention, it comprises the steps:

[0053] (1) The acidic ammonium nitrate-containing uranium-containing wastewater from uranium purification and conversion is mixed with sodium hydroxide solution to form an extraction stock solution with an acidity of 0.5mol / L;

[0054] The components of the acidic ammonium nitrate-containing uranium-containing wastewater include: [U]=0.2g / L, [HNO 3 ]=0.5mol / L, [NH 4 NO 3 ]=100g / L;

[0055] The mass percentage of described sodium hydroxide solution is 30%;

[0056] (2) extracting the stock solution obtained in step (1) with a TBP-hydrogenated kerosene extractant with a volume percentage of 20%; the two-phase flow ratio of the extractant and the stock solution is 1:3;

[0057] (3) After the extraction, the loaded organic phase can be sent to the uranium purification conversion extra...

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Abstract

The invention provides a method for recovering uranium in acidic ammonium nitrate-containing uranium-containing wastewater, which comprises the following steps: (1) mixing acidic ammonium nitrate-containing uranium-containing wastewater from uranium purification and conversion with sodium hydroxide solution to form an acidity of 0.3-0.8 The extraction stock solution of mol / L; (2) the TBP-hydrogenated kerosene extractant of 20~40% is extracted with the obtained extraction stock solution and volume percentage; The two-phase flow ratio 1:(3~5 of extraction agent and extraction stock solution ); (3) After the extraction, the loaded organic phase can be sent to the uranium purification conversion extraction process, and used as the extraction agent of the extraction pulse column; after the extraction, the raffinate aqueous phase is sampled and analyzed, if the uranium content is ≤50 μg / L, return to the step (1) It is used to prepare a sodium hydroxide solution with a mass percentage of 30-50%; if the uranium content is >50 μg / L, return to step (1) and treat it as waste water again. The invention reasonably determines the process parameters, optimizes the waste water treatment process, and is used for the uranium recovery and treatment of the process acidic ammonium nitrate-containing uranium-containing waste water, and the uranium yield is all above 99%.

Description

technical field [0001] The invention relates to the technical field of uranium-containing wastewater treatment, in particular to a method for recovering uranium in acidic ammonium nitrate-containing uranium-containing wastewater. Background technique [0002] Uranium-containing wastewater treatment mainly includes evaporation concentration method, precipitation method, adsorption method, ion exchange method, membrane treatment method, extraction method, magnetic molecular method, and ion flotation method. Among them, the methods that have been widely used in industry mainly include evaporation concentration method, precipitation method, adsorption method, ion exchange method and extraction method. The evaporation and concentration method is not suitable for treating waste water containing volatile nuclides and foaming easily. It consumes a lot of heat energy and has high operating costs. At the same time, potential threats such as corrosion, scaling, and explosion must be co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B60/02C22B7/00C22B3/38
CPCC22B7/006C22B60/026C22B3/3846
Inventor 张慧忠魏刚高月华茹发全马晓文陆文博蒙秀君侯彦龙冯秀燕周会琴李浩然
Owner THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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