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Method for preventing ore heap hardening

A technology of ore heap and compaction, which is applied in the field of hydrometallurgy to achieve the effects of stabilizing metal concentration, shortening heap leaching acidification period, and high convection strength

Inactive Publication Date: 2016-04-20
BEIJING RES INST OF CHEM ENG & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a new method for preventing ore heap compaction in the process of acid heap leaching. Its purpose is to prevent the metal in the leachate from and impurities form insoluble secondary sediments in the heap to solve the problems of ore heap compaction and decreased permeability, and ensure the smooth progress of the heap leaching process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A certain medium and low temperature hydrothermal uranium ore, with a uranium grade of 0.131%, crush the ore to -5mm and build a pile with a height of 2m.

[0020] 1) First spray and wet the mine pile with clean water, the spray intensity is 60L / (m 2 ·H);

[0021] 2) After the leaching liquid flows out from the lower part of the mine pile, it is sprayed with a prepared 50g / L sulfuric acid solution to keep the spray strength at 60L / (m 2 ·H), the volume of the leaching agent sprayed every day is 0.4 times of the mass of the ore, and the spraying is kept non-intermittently throughout the day. The acidification period of the ore pile was shortened to 4 days, and the pH of the effluent was reduced to 1.6.

[0022] 3) Keep the acidity of the spray agent (50g / L sulfuric acid solution) unchanged, and gradually reduce the volume of the spray liquid according to the pH change of the effluent, while adjusting the spray intensity, and continue spraying and leaching the mine pile.

[0023] ...

Embodiment 2

[0026] A fragmented altered granite-type uranium ore with a uranium grade of 0.08%. The ore was crushed to -10mm and piled up with a height of 2.5m.

[0027] 1) First spray and wet the mine pile with clean water, the spray strength is 50L / (m 2 ·H);

[0028] 2) After the leaching liquid flows out from the lower part of the mine pile, it is sprayed with a prepared 80g / L sulfuric acid solution, and the spray strength is maintained at 70L / (m 2 ·H), the volume of the leaching agent sprayed every day is 0.4 times of the mass of the ore, and the spraying is kept non-intermittently throughout the day. The acidification period of the mine pile was shortened from 22 days to 5 days, and the pH of the effluent was reduced to 1.9.

[0029] 3) Keep the acidity of the spray agent (80g / L sulfuric acid solution) unchanged, and gradually reduce the volume of the spray liquid according to the pH change of the effluent, while adjusting the spray intensity, and continue spraying and leaching the mine pil...

Embodiment 3

[0033] A certain medium-low carbonate uranium ore, the ore uranium grade is 0.061%, the ore is crushed to -8mm and the pile height is 3.0m.

[0034] 1) First spray and wet the mine pile with clean water, the spray strength is 50L / (m 2 ·H);

[0035] 2) After the leachate flows out from the lower part of the mine pile, it is sprayed with a prepared 60g / L sulfuric acid solution, and the spray strength is maintained at 65L / (m 2 ·H), the volume of the leaching agent sprayed every day is 0.32 times the mass of the ore, and the spraying is kept non-intermittently throughout the day. The acidification period of the ore pile was shortened from 15 days to 5 days, and the pH of the effluent was reduced to 1.7.

[0036] 3) Keep the acidity of the spray agent (60g / L sulfuric acid solution) unchanged, gradually reduce the volume of the spray liquid according to the pH change of the effluent, while adjusting the spray intensity, and continue spraying and leaching the mine pile.

[0037] 4) After 35 ...

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PUM

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Abstract

The invention belongs to the technical field of hydrometallurgy, particularly relates to a method for preventing ore heap hardening, and aims to prevent metals and impurities in leach liquor from forming insoluble precipitate in a heap and solve the problems of ore heap hardening, permeability lowering and the like by means of increasing the spraying amount and spraying acidity, optimizing a spraying system and the like. The method is characterized by comprising heap wetting, ore heap acidification period treatment, heap leaching medium-term treatment and leaching post-treatment. According to the method, ore is fully wetted with clear water before leaching, so that the residence time of an acidification-period high-concentration solution on the surface of ore is shortened, and secondary precipitation of leaching matters is relieved; high spraying strength is adopted at an ore heap acidification period, so that the thickness of a liquid film on the surface of the ore is reduced, and the ore leaching strength is enhanced; the sulfuric acid concentration of spraying liquid is kept constant at a heap leaching medium period, so that the spraying amount of a leaching agent is reduced gradually, the leaching process is enhanced, the metal concentration of the leaching liquor is increased, smooth proceeding of heap leaching is ensured, and the leaching period is shortened.

Description

Technical field [0001] The invention belongs to the technical field of hydrometallurgy, and specifically relates to a method for preventing hardening of a ore pile. Background technique [0002] During the heap leaching process, the elements in the ore react with the leaching agent, and the leached valuable metals and impurity elements migrate in the ore pile with the leaching agent. During the migration process, due to changes in pH, potential, impurity element concentration, etc., extremely Easy to form secondary chemical precipitation. The formation of chemical precipitates not only causes compaction of the ore pile and affects the permeability of the ore pile, but also easily forms inclusions in the ore pile, which affects the recovery of valuable elements in the ore. Therefore, in order to ensure the smooth progress of the heap leaching process and increase the recovery rate of valuable metals in the ore, it must be controlled. [0003] For ore pile compaction problems, phys...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B60/02
CPCC22B3/08C22B60/0234Y02P10/20
Inventor 刘会武黄永刘忠臣师留印刘智贾秀敏杨剑飞陈天宝向秋林
Owner BEIJING RES INST OF CHEM ENG & METALLURGY
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