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Method of extracting radioactive uranium in fly ash

A technology for radioactive uranium and fly ash, applied in the field of extracting radioactive uranium, can solve problems such as inability to meet demand and shortage of resources, and achieve the effects of shortening project time, improving radioactive pollution, and reducing environmental pollution

Inactive Publication Date: 2008-05-14
BEIJING SIPADUN MINERAL RESOURCE INVESTMENT CONSULTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the whole world is facing the common problem of resource shortage, this kind of conventional mining is far from meeting the demand

Method used

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  • Method of extracting radioactive uranium in fly ash
  • Method of extracting radioactive uranium in fly ash
  • Method of extracting radioactive uranium in fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Coal contains a certain amount of uranium, most of which exists in the form of solid coal ash after combustion. Most coal combustion processes produce "fly ash" recovered from the gas stream and "bottom ash" extracted from the combustion tunnel. Uranium is distributed in a certain proportion in fly ash and bottom ash. Therefore, the extraction process should involve both forms of coal ash.

[0051] Extraction of uranium is best performed in a series of reaction tanks containing mineral acids. Sulfuric acid is usually the acid of choice due to its low cost, easy availability and ease of handling. A series of reaction tanks are used in the acid leaching process to optimize the contact time and maximize the dissolution of uranium.

[0052] The acid leached slurry is then washed, usually using countercurrent separation and mixing in a series of tanks, or countercurrent filtration, to maximize uranium recovery and reduce acid and uranium content in the remaining solution....

Embodiment 2

[0054] Example 2 Lignite

[0055] Lignites vary in fuel value, ash content and water content, so some can be used as fuel and others can't. If a lignite can be efficiently burned, the process for extracting uranium from it is similar to that described above for the extraction of uranium from coal. But most lignite has a low fuel composition and cannot be used for electricity or steam. This material is best used for firing to extract uranium, which can be processed in a fluidized bed.

[0056]The burnt lignite is first reacted with medium or weakly acidic solution, and then filtered. Among them, filtration is to purify the solution to extract uranium. The filtered solid is acidified by a strong acid solution, and the acidified solution is poured in reverse, and then filtered. For further processing, neutral or weak acids from the mixing and separation process are recycled back into the starting neutral solution. The acidification process should be carried out at a temperat...

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Abstract

A method to extract uranium with radioactivity from breeze, content of which is as follows: (1) Coal is broke, washed, skived and burnt. (2) Remains after burning are acidized. (3) Condensate is separated and washed. (4) Suspended substance is eliminated. (5) Fine filtration. (6) U4+ is oxidized to U6+. (7) Uranium is extracted and separated in organic solvent. (8) U6+ is deoxidized to U4+ and U4+ acid solution is separated. (9) Acid solution is contacted with oxidant and translated to U6+ acid solution. (10) Second-level extraction is carried in organic solution to get second-level raffinate of U6+. (11) Ammonia-uranium base and three carbon alloy can be separated and produced by meeting with amido-carbonate solution. (12) 2-ethylhexyl phosphoric acid is formed by mixing with organic solvent which is non-water soluble. (13) Acidification. (14) DEPA wax is separated. (15) Uranium-base peroxide is created by hydrogen peroxide of water-soluble acid composing to deposit and separate. Extraction of uranium from coal can lower the production cost of uranium and reduce the environmental pollution, which offers an effective method for energy conservation.

Description

technical field [0001] The invention relates to a method for extracting radioactive uranium from fly ash. Background technique [0002] At present, the conventional methods for developing and utilizing uranium resources in China can be mainly divided into two categories, one is the conventional mining development process from mining to beneficiation and extraction, and the other is the in-situ leaching method. [0003] figure 1 Existing conventional process flow diagram for uranium mining and processing. refer to figure 1 The mining of conventional uranium deposits is to mine uranium ore from uranium deposits with industrial value through open-pit mining and underground mining, and then through radioactive beneficiation, crushing, and grinding; or chemically leaching uranium metal, To produce liquid uranium compounds, the mined ore and uranium solution must be extracted and refined in the uranium water smelter. According to different requirements, the prepared uranium ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B60/02C22B3/08C22B3/22C22B3/26
Inventor 李巴克葛启明
Owner BEIJING SIPADUN MINERAL RESOURCE INVESTMENT CONSULTING
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