Intensified uranium ore heap leaching method

A uranium ore and enhanced heap technology, which is applied in the field of uranium ore heap leaching, can solve the problems of low leaching power, low acid concentration of leaching agent, and high slag grade, and achieve the effects of accelerating metal leaching, shortening leaching time, and reducing slag grade

Active Publication Date: 2009-10-21
中核赣州金瑞铀业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the acid concentration of the leaching agent is very low in the later stage of leaching (generally 5g / L of H 2 SO 4 ), the leaching power is very small, resulting in a long leaching time and high slag grade

Method used

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  • Intensified uranium ore heap leaching method
  • Intensified uranium ore heap leaching method
  • Intensified uranium ore heap leaching method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Such as figure 2 As shown, adopt the uranium ore enhanced heap leaching method described in the present invention, carry out heap leaching to the first ore of raw ore grade at 0.110%, its specific steps are as follows:

[0021] (1) First crush the uranium ore and transport it to the heap leaching site for heaping;

[0022] (2) Spray leaching agent (sulfuric acid) for ore heap leaching, use high spray intensity spray leaching agent in the initial stage, and the spray intensity is greater than 30L / m 2 h, so that the metal uranium to be leached is leached as soon as possible, and then the spraying intensity is gradually reduced. After 25 days, the leaching rate of the leached metal uranium reaches 75%, and the spraying of the leaching agent is stopped;

[0023] (3) Adsorb or extract the leaching solution obtained in step (2), and the saturated resin or saturated organic phase containing uranium metal enters the post-treatment process, and the adsorption tail liquid or ra...

Embodiment 2

[0029] Adopt the enhanced heap leaching method of uranium ore of the present invention, carry out heap leaching to the ore grade B of 0.124% of raw ore grade, its specific steps are as follows:

[0030] (1) First crush the uranium ore and transport it to the heap leaching site for heaping;

[0031] (2) Spray leaching agent (sulfuric acid) for ore heap leaching, use high spray intensity spray leaching agent in the initial stage, and the spray intensity is greater than 30L / m 2 h, so that the metal uranium to be leached is leached as soon as possible, and the spraying intensity is gradually reduced in the future. After 30 days, the leaching rate of the metal uranium reaches 70%, and the spraying of the leaching agent is stopped;

[0032] (3) Adsorb or extract the leaching solution obtained in step (2), the saturated resin or saturated organic phase containing uranium metal enters the post-treatment process, and the adsorption tail liquid or raffinate water phase can be supplement...

Embodiment 3

[0038] Adopt the uranium ore enhanced heap leaching method described in the present invention, carry out heap leaching to the raw ore grade at 0.196% C ore, its specific steps are as follows:

[0039] (1) First crush the uranium ore and transport it to the heap leaching site for heaping;

[0040] (2) Spray leaching agent (sulfuric acid) for ore heap leaching, use high spray intensity spray leaching agent in the initial stage, and the spray intensity is greater than 30L / m 2 h, so that the metal uranium to be leached is leached as soon as possible, and then the spraying intensity is gradually reduced. After 55 days, the leaching rate of the leached metal uranium reaches 80%, and the spraying of the leaching agent is stopped;

[0041] (3) Adsorb or extract the leaching solution obtained in step (2), the saturated resin or saturated organic phase containing uranium metal enters the post-treatment process, and the adsorption tail liquid or raffinate water phase can be supplemented ...

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Abstract

The invention provides an intensified uranium ore heap leaching method, which comprises the following steps: (1) uranium ores are crushed firstly and then transported to a heap leaching field for heaping; (2) a leaching agent is sprayed on stock heap for leaching; (3) leachate obtained from step (2) is absorbed or extracted. Saturated resin containing metallic uranium or saturated organic phase goes through a post treatment process, and absorption tailing solution or raffinate water phase is added with acid and then returned for being used as a leaching agent for the next heap; when the leaching agent is sprayed in step (2), the leaching agent spraying is called off if the leaching ratio of the metallic uranium reaches 70 percent to 80 percent. After prospective tailings are dried and heaped for a plurality of days, a curing agent with a weight of 0.08 to 0.12 time of that of the prospective tailings is used for curing and the prospective tailings are cured for a plurality of days and then leached in a sprayed manner. The leachate obtained from sprayed leaching can return and be used as the leaching agent for the next heap. After the neutralization, the tailings are discharged into a tailing tank. The uranium ores are heap leached by the method so that the grade of the tailings can be reduced and leaching time can be shortened.

Description

technical field [0001] The invention relates to a uranium ore heap leaching technology, in particular to a uranium ore enhanced heap leaching method. Background technique [0002] Existing surface heap leaching of uranium ore, the ore is crushed and transported to the heap leaching site for heaping, spraying leaching agent for leaching, the leaching solution is adsorbed or extracted to recover metal uranium, and the adsorption tail liquid or raffinate water phase is supplemented with acid and returned for reuse As a leaching agent, the saturated resin (or saturated organic phase) enters the post-treatment process. When the uranium concentration in the leaching solution is lower than a certain value or after a predetermined leaching time, the leaching ends and the heap is washed with water. The tailings are discharged into the tailings storage after being neutralized. Existing heap leaching process such as figure 1 shown. [0003] In the initial stage of leaching in the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B60/02C22B3/04C22B3/24C22B3/26
CPCY02P10/20
Inventor 陈正球曾瑞虎
Owner 中核赣州金瑞铀业有限公司
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