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High intensity leaching method in initial heap leaching

A high-strength, leaching technology, applied in the field of uranium ore heap leaching, can solve the problems of reduced effect of high-acid aging of quasi-tailings, achieve the effects of shortening the acidification time, reducing the grade of tailings, and reducing the amount of production

Inactive Publication Date: 2015-09-23
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

The effect of high-acid curing of quasi-tailings is also significantly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The high-strength leaching method at the initial stage of heap leaching according to the present invention includes the following steps:

[0018] (1) The uranium ore is first crushed and separated into fine-grained grades before being transported to the heap leaching yard for stacking;

[0019] (2) Spray the leaching agent on the mine pile; the initial stage of spraying the leaching agent, that is, the acidification period, use high-acidity leaching agent, with high spray intensity, continuous spraying 24 hours a day; said high-acidity leaching agent The acid concentration is 100g / L; the high spray intensity is 50L / M 2 ·H;

[0020] (3) The leaching solution obtained in step (2) is adsorbed to recover uranium, the adsorption tail solution is supplemented with acid and then returned to be used as a leaching agent, and the saturated resin enters the post-treatment process;

[0021] Alternatively, the leaching solution obtained in step (2) is extracted to recover uranium, the raffi...

Embodiment 2

[0030] The high-strength leaching method at the initial stage of heap leaching according to the present invention includes the following steps:

[0031] (1) The uranium ore is first crushed and separated into fine-grained grades before being transported to the heap leaching yard for stacking;

[0032] (2) Spray the leaching agent on the mine pile; the initial stage of spraying the leaching agent, that is, the acidification period, use high-acidity leaching agent, with high spray intensity, continuous spraying 24 hours a day; said high-acidity leaching agent The acid concentration is 80g / L; the high spray intensity is 80L / M 2 ·H;

[0033] (3) The leaching solution obtained in step (2) is adsorbed to recover uranium, the adsorption tail solution is supplemented with acid and then returned to be used as a leaching agent, and the saturated resin enters the post-treatment process;

[0034] Alternatively, the leaching solution obtained in step (2) is extracted to recover uranium, the raffin...

Embodiment 3

[0042] The high-strength leaching method at the initial stage of heap leaching according to the present invention includes the following steps:

[0043] (1) The uranium ore is first crushed and separated into fine-grained grades before being transported to the heap leaching yard for stacking;

[0044] (2) Spray the leaching agent on the mine pile; the initial stage of spraying the leaching agent, that is, the acidification period, use high-acidity leaching agent, with high spray intensity, continuous spraying 24 hours a day; said high-acidity leaching agent The acid concentration is 120g / L; the high spray intensity is 35L / M 2 ·H;

[0045] (3) The leaching solution obtained in step (2) is adsorbed to recover uranium, the adsorption tail solution is supplemented with acid and then returned to be used as a leaching agent, and the saturated resin enters the post-treatment process;

[0046] Alternatively, the leaching solution obtained in step (2) is extracted to recover uranium, the raffi...

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Abstract

The present invention provides a high intensity leaching method in initial heap leaching. The method comprises the steps of: first crushing uranium ore, separating fine fraction and transferring to a leaching field for heap construction; (2) leaching an ore heap by spray leaching agents; employing a leaching agent with high acidity in the initial leaching agent stage namely acidification stage, and spraying continuously 24 hours a day by high spray intensity; (3) adsorbing the leaching liquid obtained in step (2) to recover uranium, adding acid in the absorption tail liquid and returning to be reused as the leaching agent, and sending the saturated resin into a posttreatment process; (4) when the uranium concentration in the leaching liquid is less than 50mg / L or liquid metered leaching rate reaches 85%, conducting quasi tailings acid curing for a few days, washing the heap, returning the washing liquid to be used as leaching agent for the next heap, neutralizing the tailings and discharged the into a tailings storage. The heap leaching method provided by the invention can prevent the phenomena of ore wrapping by precipitates and leaching channel clogging in the acidification stage of ore heap, shorten leaching time and reduce tailings grade.

Description

Technical field [0001] The invention relates to a uranium ore heap leaching technology, in particular to a high-strength leaching method at the initial stage of heap leaching. Background technique [0002] Existing surface heap leaching of uranium ore. The ore is crushed (after some units are separated into fine-grained grades) and transported to the heap leaching site for piles, sprayed with a leaching agent, and the leaching solution is adsorbed (or extracted) to recover uranium, and the tail liquid is adsorbed (or extracted). The remaining water phase) is supplemented with acid and then returned to be used as a leaching agent, and the saturated resin (or saturated organic phase) enters the post-treatment process. When the uranium concentration of the leaching solution is lower than a certain value or the leaching time is a predetermined time, the initial leaching is finished, a curing agent is added, and the pile is washed with water after a few days of curing, the washing sol...

Claims

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Application Information

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