A method for separating uranium during gallium treatment in Bayer process alumina production

A technology of treatment process and separation method is applied in the field of separation of uranium in the process of gallium treatment in the production of alumina by the Bayer process, and can solve the problems of low uranium content, complex matrix components, and complicated gallium production process flow, and achieve high product purity. , Improve the purity and quality, the effect of thorough elution

Active Publication Date: 2017-06-30
GUIZHOU BRANCH CHINA ALUMINUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, it is necessary to separate the radionuclide uranium in the production process of gallium. The difficulty lies in the low content of uranium in the system and complex matrix components; and the production process of gallium is complicated, and any change in the process section will affect the entire process

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  • A method for separating uranium during gallium treatment in Bayer process alumina production

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Embodiment 1

[0030] The method for separating uranium in the gallium treatment process in the Bayer process alumina production of the present invention comprises the following steps:

[0031] A. Neutralize the sulfuric acid desorption solution of 100 m³ gallium with solid sodium hydroxide to pH=1.0, and the content of uranium in the solution is measured to be 40 μg / mL;

[0032] B. The neutralized solution in step A flows through the pretreated two-stage fixed bed KN type strong basic anion resin, the ion exchange column size is φ500 mm×2000 mm, the ion exchange resin column bed height is 1.6 m, and the flow rate is 4 m³ / h, adopt the method of circulating the uranium-containing solution through the column until the content of uranium in the solution is less than 1 μg / mL;

[0033] C. The column liquid is neutralized with solid sodium hydroxide to pH = 5.0 to obtain gallium mud precipitation. The gallium mud is dissolved in sodium hydroxide solution to obtain a gallium mud solution. Quicklim...

Embodiment 2

[0037] The method for separating uranium in the gallium treatment process in the Bayer process alumina production of the present invention comprises the following steps:

[0038] A. Neutralize the sulfuric acid desorption solution of 100 m³ gallium with sodium hydroxide solution to pH=1.5, and the content of uranium in the solution is measured to be 32 μg / mL;

[0039] B. The neutralized solution in step A flows through the pretreated single-stage fixed bed KN type strong basic anion resin, the ion exchange column specification is φ500 mm×2000 mm, the ion exchange resin column bed height is 1.6 m, and the flow rate is 5m³ / h. Adopt the method of circulating the uranium-containing solution through the column until the content of uranium in the solution is less than 1 μg / mL, and then stop the circulation;

[0040] C. The column liquid is neutralized with solid sodium hydroxide to pH = 6.0 to obtain gallium mud precipitation. The gallium mud is dissolved in potassium hydroxide solu...

Embodiment 3

[0044] The method for separating uranium in the gallium treatment process in the Bayer process alumina production of the present invention comprises the following steps:

[0045] A. Neutralize the sulfuric acid desorption solution of 100 m³ gallium with solid sodium hydroxide to pH=2.0, and the content of uranium in the solution is about 18 μg / mL;

[0046] B. The neutralization solution in step A flows through the pretreated single-stage fixed bed KN type strong basic anion resin, the ion exchange column size is φ500 mm×2000 mm, the ion exchange resin column bed height is 1.6 m, and the flow rate is 3 m³ / h , take the method of circulating the uranium-containing solution through the column until the content of uranium in the solution is less than 1 μg / mL, and stop the circulation;

[0047] C. The column solution is neutralized to pH=8.0 with sodium hydroxide solution to obtain gallium mud precipitation, and the gallium mud is dissolved in sodium hydroxide solution to obtain a g...

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Abstract

The invention discloses a uranium separation method during gallium treatment in aluminum oxide production through a Bayer process. The uranium separation method comprises the following steps that A, the pH of a special-effect resin acid desorption solution of gallium is controlled to be 1-3; B, a neutralization solution in the step A is made to flow through a pretreated anion exchange resin column, and a column passing solution is separated; C, the column passing solution is neutralized through sodium hydroxide till the pH value reaches 5-9, deposited gallium mud is obtained, the gallium mud is dissolved through alkali liquor, the gallium mud dissolved liquid is obtained, quick lime is added into the dissolved liquid, vanadium is removed through sedimentation, heavy metal in the solution is removed, electrolysis is conducted, and crude gallium products are obtained; D, the anion exchange resin column is subjected to cleaning and impurity removal through diluted acid, and uranium is eluted through acid nitrate or acid chloride; and E, sodium hydroxide is added into the uranium-contained water phase, the pH of the solution is adjusted to be 7-9, sodium diuranate sedimentation is generated, and crude uranium products are obtained after filtering and separation. The uranium separation method is designed according to different characteristics of uranium and gallium, uranium-gallium separation is achieved, and uranium can be recycled.

Description

technical field [0001] The invention belongs to the technical field of recovery of radioactive elements, and in particular relates to a separation method for uranium in the gallium treatment process in alumina production by Bayer process. Background technique [0002] At present, the production of gallium mainly uses gallium special-effect chelating resin to selectively adsorb the process liquid of aluminum produced by Bayer process. Gallium special-effect chelating resin can effectively recover gallium ions in alkaline solution. The saturated resin undergoes a series of processes such as sulfuric acid elution, neutralization and separation, precipitation and dissolution, and impurity removal to obtain the corresponding electrolytic gallium electrolyte, and the gallium product is obtained after electrolysis. [0003] However, the gallium special-effect resin in the above process also has a certain adsorption effect on the radionuclide uranium. Because uranyl ions can form co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/42C22B58/00C22B60/02
CPCC22B3/42C22B58/00C22B60/0217
Inventor 董红军李伯平张正林郭冬发许家伟崔建勇梁愈斌谢胜凯
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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