Method for recycling uranium from uranium extraction tailings

A technology for recovering uranium and tailings, applied in the field of metallurgy, can solve the problems of low recovery rate of uranium, no extraction value and high extraction cost

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

[0005] Since some uranium hydrometallurgical plants have adopted the traditional hydrometallurgy process to extract uranium from the primary uranium ore, when the uranium remaining in the tailings is extracted by the traditional uranium extraction process, firstly, the uranium recovery rate is lower than 60% %, th

Method used

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  • Method for recycling uranium from uranium extraction tailings
  • Method for recycling uranium from uranium extraction tailings
  • Method for recycling uranium from uranium extraction tailings

Examples

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Embodiment 1

[0064] Take 100g of uranium tailings, first use the screening method to separate the uranium tailings with a particle size greater than 2mm from the uranium tailings with a particle size of less than 2mm, and for the tailings particles with a particle size of more than 2mm, carry out wet grinding and crushing to below 2mm, and then combine them with the uranium tailings with a particle size of less than 2mm Mix the uranium tailings, add nitric acid and water to adjust the slurry, so that the pH value of the slurry reaches 0.6-0.9, and the volume of the nitric acid and water is controlled to be 1.5 times the tailings mass, that is, 150mL. Heat to 65-70°C for stirring and leaching for 1 hour, or stir and mix at room temperature and soak for 30 days, then separate liquid from solid, and wash the leaching residue with water twice to make the pH value of the leaching residue nearly neutral (pH=5 -7). Discard the leaching residue, add 0.01g bone glue to the nitric acid leaching solu...

Embodiment 2

[0066] Take 100g of uranium tailings, first use the screening method to separate the uranium tailings with a particle size greater than 2mm from the uranium tailings with a particle size of less than 2mm, and for the tailings particles with a particle size of more than 2mm, carry out wet grinding and crushing to below 2mm, and then combine them with the uranium tailings with a particle size of less than 2mm Mix the uranium tailings, add nitric acid and water to adjust the slurry, so that the pH value of the slurry reaches 0.6-0.9, and the volume of adding nitric acid and water is controlled to be twice the mass of the tailings, that is, 200mL. Heat to 65-70°C for stirring and leaching for 1.5 hours, or stir and mix at room temperature and soak for 30 days, then separate liquid from solid, and wash the leaching residue twice with water to make the pH value of the leaching residue nearly neutral (pH=5 -7). Discard the leaching slag, add 0.05g bone glue to the nitric acid leachin...

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Abstract

The invention discloses a method for recycling uranium from uranium extraction tailings, which comprises the following steps: crashing the tailings until the grain diameter is less than 2 mm, adding nitric acid to mix to enable the pH value of the ore pulp to reach 0.6-0.9, adding the nitric acid and water to control the volumes of the nitric acid and water to be 1.5-2 times of the mass of the tailings, heating to 65-70 DEG C, stirring and soaking for 1-1.5 hours, or after stirring and mixing uniformly at the normal temperature, soaking for 30 days, separating liquid and solid, washing the soak slag by the water until the pH value of the soaked slag is close to a neutral value (pH=5-7); adding bone glue into the nitric acid lixivium, placing and aging for 5-7 days to make supersaturated salt materials in the lixivium separate out, adjusting the pH value of the lixivium to 1.75 by using caustic soda, and then carrying out ion exchange absorption on the uranium using a 717 type anion exchange resin, eluting uranium ions by using 0.2 mol/L of nitric acid to 0.4 mol/L of ammonium nitrate solution as an eluent; and adjusting the pH value of the eluent to 7-8 to neutralize and precipitate the uranium to obtain uranium ore concentrates containing 65-75% of uranium. By adopting the method, the recycling rate of the uranium can reach over 90%.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for secondary recovery of uranium from volcanic rock type uranium extraction tailings by wet method. Background technique [0002] There are many large-scale or even super-large volcanic rock-type uranium deposits in my country. The deposits are large in scale, similar in mineral composition, and basically of the same genetic type, such as the Le'an uranium deposit in Fuzhou, Jiangxi. The mining and smelting of these large uranium mines laid a solid foundation for the development of my country's early atomic energy industry, especially in breaking the Western nuclear monopoly and making great contributions to the peaceful use of nuclear energy. [0003] Since the late 1950s, after nearly 50 years of uranium mining and smelting, this type of volcanic rock-type uranium deposit has produced more than 20 million tons of highly radioactive uranium tailings during the long-...

Claims

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Application Information

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IPC IPC(8): C22B60/02C22B3/24C22B3/42C22B3/06C22B3/46
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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