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Method for recycling uranium from uranium extraction coal residue with wet method

A technology for recovering uranium and coal slag, applied in the field of metallurgy, can solve problems such as idle waste of uranium resources, environmental pollution, uranium extraction, etc., and achieve the effects of promoting local economy and society, developing circular economy, and high recovery rate

Inactive Publication Date: 2010-01-06
JIUJIANG BAIDUN VANADIUM TECH TRADING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After more than 30 years of germanium extraction in the Lincang area, a large amount of uranium-containing cinders have been produced. However, due to uranium extraction technology and cost reasons, the uranium has not been extracted. Such a large amount of high-uranium-containing cinders have been stored for a long time. First, it has caused high radioactivity. The pollution to the environment, the second is to cause idle waste of uranium resources

Method used

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  • Method for recycling uranium from uranium extraction coal residue with wet method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) The cinder is first crushed by a ball mill to below 200 mesh;

[0021] 2) Mixing cinders with a calcium content higher than 6% and cinders with a calcium content lower than 2% and stirring them evenly to reduce the calcium content in the raw cinders to 2-5%, so as to achieve a better leaching effect;

[0022] 3) Take 100g of pulverized coal cinder, add 150mL of 98g / L sulfuric acid solution and 25mL of 5g / L hydrofluoric acid solution, and use 30mL hydrogen peroxide with a concentration of 30% by mass as an oxidizing agent for oxidative leaching 150mL of sulfuric acid solution of 98g / L and 25mL of hydrofluoric acid solution of 5g / L, and 3mL of hydrogen peroxide with a mass percentage concentration of 30% are used as oxidant to carry out oxidative leaching of the leaching residue;

[0023] 4) The primary leaching filtrate of uranium is adjusted to pH 9.8-10.2 with ammonia water with a concentration of 25% by mass, and the silicon in the solution becomes a silicic acid p...

Embodiment 2

[0026] 1) The cinder is first crushed by a ball mill to below 200 mesh;

[0027] 2) Mixing cinders with a calcium content higher than 6% and cinders with a calcium content lower than 2% and stirring them evenly to reduce the calcium content in the raw cinders to 2-5%, so as to achieve a better leaching effect;

[0028] 3) Take 100g of pulverized coal slag, add 100mL of 98g / L sulfuric acid solution and 50mL of 5g / L hydrofluoric acid solution, and use 2.5mL of 30% hydrogen peroxide as an oxidizing agent to oxidize For leaching, use 100 mL of 98 g / L sulfuric acid solution, 50 mL of 5 g / L hydrofluoric acid solution, and 2.5 mL of hydrogen peroxide with a concentration of 30% by mass as the oxidizing agent for oxidative leaching of the leaching residue;

[0029] 4) The primary leaching filtrate of uranium is adjusted to pH 9.8-10.2 with ammonia water with a concentration of 25% by mass, and the silicon in the solution becomes a silicic acid precipitate. Ion exchange resin for exch...

Embodiment 3

[0032] 1) The cinder is first crushed by a ball mill to below 200 mesh;

[0033] 2) Mixing cinders with a calcium content higher than 6% and cinders with a calcium content lower than 2% and stirring them evenly to reduce the calcium content in the raw cinders to 2-5%, so as to achieve a better leaching effect;

[0034] 3) Take 100 g of pulverized coal cinder, add 150 mL of 98 g / L sulfuric acid solution and 50 mL of 5 g / L hydrofluoric acid solution, and use 5 mL of 30% hydrogen peroxide as an oxidizing agent for oxidative leaching , the leaching residue is oxidized and leached again with 150 mL of 98 g / L sulfuric acid solution and 50 mL of 5 g / L hydrofluoric acid solution, and 5 mL of hydrogen peroxide with a mass percent concentration of 30% as an oxidizing agent;

[0035] 4) The primary leaching filtrate of uranium is adjusted to pH 9.8-10.2 with ammonia water with a concentration of 25% by mass, and the silicon in the solution becomes a silicic acid precipitate. Ion exchang...

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Abstract

The invention discloses a method for recycling uranium from uranium extraction coal residue with a wet method, which comprising the following steps: (1) particle size requirements: crashing the coal residue below 200 meshes; (2) oxidation and acid leaching: in a dilute sulphuric acid-hydrofluoric acid medium, using peroxide as an oxidizer to carry out reverse oxidation leaching twice; (3) desilicification and purification: using ammonia to adjust the pH value of once leaching filtering liquid of the uranium to 9.8-10.2, enabling the silicon in the solution to become silicic acid sediments, after filtering, carrying out ion exchange on the filtering liquid, desilicificating slag and stockpiling; (4) ion exchange: using a 717 type ion exchange resin to carry out exchange absorption by the filtering liquid, and then using 1 mol / L of NaCl-0.1 mol / LH2SO4 of mixed solution to elute the resin, after using tributyl phosphate to carry out extraction and back-extraction on eluent, obtaining uranium concentrates containing about 65% of the uranium. The invention successfully extracts and separates the uranium from the uranium extraction coal residue to produce the uranium concentrates, has t high recycling rate of uranium as high as 80-85% and low cost, and comprehensively utilizes the uranium extraction waste, thereby eliminating the influence of the radiation wastes on the ecological environment.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for wet recovery of uranium from germanium extraction coal slag. Background technique [0002] The Lincang area of ​​Yunnan Province is rich in uranium resources, and most of the uranium is associated with lignite mines in the Bangmai Basin. The content of uranium in lignite mines is 30-100g / t. Although there is no exact uranium reserve report, a large amount of coal cinders in the Bangmai Coal Mine after extracting germanium by fire method all contain 150-250g / t of uranium. Uranium has been enriched 2 to 4 times. After more than 30 years of germanium extraction in the Lincang area, a large amount of uranium-containing cinders have been produced. However, due to uranium extraction technology and cost reasons, the uranium has not been extracted. Such a large amount of high-uranium-containing cinders have been stored for a long time. First, it has caused high radioacti...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B60/02C22B3/06C22B3/42C22B3/24C22B3/38
CPCY02P10/20
Inventor 李巴克葛启明普世坤谢讯杨兴林
Owner JIUJIANG BAIDUN VANADIUM TECH TRADING
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