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augdc precipitation mother liquor recovery and treatment process
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A technology of precipitation mother liquor, recovery and treatment, applied in nuclear engineering, radioactive purification, etc., can solve the problems of recovery and treatment process of AUGdC precipitation mother liquor, and achieve the effect of avoiding secondary pollution and reducing consumption
Active Publication Date: 2019-03-01
NUCLEAR POWER INSTITUTE OF CHINA
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[0004] The purpose of the present invention is to solve the problem that no relevant AUGdC precipitation mother liquor recovery process has been seen in the prior art. The present invention provides a method for recovering uranium and gadolinium in the AUGdC precipitation mother liquor by using a cooking method and macroporous granular silica gel. AUGdC PrecipitationMother Liquor Recycling Process for Treating Cooking Clear Liquid by Adsorption Method to Make Uranium Concentration of Discharged Liquid Meet National Discharge Standards
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Embodiment 1
[0024] AUGdC precipitation mother liquor recovery treatment process, the specific raw materials, equipment and processes used are as follows:
[0025] (1) Raw materials used
[0026] AUGdC precipitation mother liquor; chemically pure nitric acid; chemically pure ammonia water.
[0030] A. Heating and cooking: Put the AUGdC precipitation mother liquor into a glass beaker, insert the temperature measuring probe to two-thirds of the mother liquor; heat the AUGdC precipitation mother liquor to 100°C with an infrared heating device.
[0031] B. Solid-liquid separation: pour the cooking liquid into the Buchner funnel, and separate the solid and liquid under negative pressure conditions to obtain the filtrate and recover the solid.
[0032] C. Filtrate treatment: add concentrated nitric acid to the filtrate until the pH value is 3, ...
Embodiment 2
[0036] The difference between this embodiment and embodiment 1 is that the process parameters of this embodiment are different, and the specific settings are as follows:
[0037] In step A, heat and cook to 95° C.; in step C, the pH value of the filtrate after acidification is 4; in step D, the adsorption contact time is 40 min.
[0038] It can be seen through testing that the recovery rate of uranium in this embodiment reaches 99.82%, and the recovery rate of gadolinium reaches 94.99%.
Embodiment 3
[0040] The difference between this embodiment and embodiment 1 is that the process parameters of this embodiment are different, and the specific settings are as follows:
[0041] In step A, heat and cook to 105° C.; in step C, the pH value of the filtrate after acidification is 2; in step D, the adsorption contact time is 20 min.
[0042] It can be seen through testing that the recovery rate of uranium in this embodiment reaches 99.84%, and the recovery rate of gadolinium reaches 96.45%.
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Abstract
The invention discloses a process for recovering and treating AUGdC precipitationmother liquor, which solves the problem in the prior art that there is no process for recovering and treating AUGdC precipitationmother liquor. The invention comprises the following steps: (1) heating and cooking: heating and cooking the AUGdC precipitationmother liquor; (2) solid-liquid separation: filtering the AUGdC precipitation mother liquor after heating and cooking, and obtaining filtrate and recovered solid respectively after filtering; (3) Filtrate treatment: adjust the pH of the filtrate to 2-4 with concentrated nitric acid for acidification, after acidification, adjust the pH of the filtrate to 8-9 with concentrated ammonia water to obtain a neutralization solution; (4) Silica gel adsorption: pass the neutralization solution through Put it into a silica gel adsorption column for uranium adsorption treatment. The invention can effectively recover and treat the uranium and gadolinium in the AUGdC precipitation mother liquor and make the uranium concentration in the discharge liquid reach the national discharge standard.
Description
technical field [0001] The invention relates to a nuclear material manufacturing process technology, in particular to a process for recovering and treating AUGdC precipitation mother liquor. Background technique [0002] This study was carried out in order to solve the problem of recycling a large amount of uranium and gadolinium components in the precipitation mother liquor produced in the AUGdC crystal preparation process, and make the uranium content meet the national emission standards. The document "H.ASSMANN, M.PEEHS&H.ROEPENACK Journal of Nuclear Material Vol.155(1988) P115" introduced the mechanical mixing method of uranium dioxide and gadoliniumtrioxide to prepare gadolinium-containing UO 2 The technology of pellets and the document "JP (public) Zhao 55-152 140" introduced the principle of thermal decomposition of gadolinium carbonate. In "Atomic Energy Science and Technology" 2008 Issue 02, the process research on the preparation of AUGdC by co-precipitation was ...
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