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A Method for Minimizing Waste from Acid Heap Leach Mine Tailings Bank

A technology for mine tailings and tailings storage, applied in the field of uranium ore leaching, can solve the problems of reducing the degree of waste water minimization, equipment and pipeline corrosion, scarring, etc., to reduce production, reduce impurity content, and improve recovery rate Effect

Active Publication Date: 2020-07-28
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, the recycling of process wastewater also brings some problems, the most important of which is the corrosion, scarring and blockage of equipment and pipelines caused by the accumulation of impurity elements in wastewater
Especially in the process of acid leaching uranium, SO 4 2- 、Na + Plasma can accumulate in large quantities during recycling, severely affecting the closed-loop process flow of uranium production and reducing the degree of waste water minimization

Method used

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  • A Method for Minimizing Waste from Acid Heap Leach Mine Tailings Bank

Examples

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Effect test

Embodiment 1

[0034] Such as figure 1 Shown, the method for making acid heap leaching mine tailings storehouse waste minimization described in the present invention, it comprises the steps:

[0035] (1) Crushing the uranium ore until the particle size is less than or equal to 6mm, and leaching the uranium ore according to the acid heap leaching process; the leaching agent used is sulfuric acid solution with a concentration of 30g / L, the oxidant is manganese dioxide, and the amount of manganese dioxide added is 1wt%;

[0036] (2) When the uranium concentration of the leaching solution of the uranium ore drops below 5 mg / L, the leaching is terminated;

[0037]The obtained leaching solution is subjected to ion exchange adsorption to extract uranium, using strong basic anion resin 201x7, using fixed bed or moving bed clear liquid ion exchange process, and the concentration of uranium in the final qualified liquid is greater than 10g / L; solvent extraction method is used to extract uranium, usin...

Embodiment 2

[0043] Such as figure 1 Shown, the method for making acid heap leaching mine tailings storehouse waste minimization described in the present invention, it comprises the steps:

[0044] (1) Crushing the uranium ore until the particle size is less than or equal to 4mm, and leaching the uranium ore according to the acid heap leaching process; the leaching agent used is a sulfuric acid solution with a concentration of 1g / L;

[0045] (2) When the uranium concentration of the leaching solution of the uranium ore drops below 5 mg / L, the leaching is terminated;

[0046] The obtained leaching solution is subjected to ion exchange adsorption to extract uranium, using strong basic anion resin 201x7, using fixed bed or moving bed clear liquid ion exchange process, and the concentration of uranium in the final qualified liquid is greater than 10g / L; solvent extraction method is used to extract uranium, using P204 extraction Sulfuric acid stripping agent, using single-stage or multi-stage ...

Embodiment 3

[0052] Such as figure 1 Shown, the method for making acid heap leaching mine tailings storehouse waste minimization described in the present invention, it comprises the steps:

[0053] (1) Crushing the uranium ore until the particle size is less than or equal to 8mm, and leaching the uranium ore according to the acid heap leaching process; the leaching agent used is sulfuric acid solution with a concentration of 50g / L, the oxidant is manganese dioxide, and the amount of manganese dioxide added is 2wt%;

[0054] (2) When the uranium concentration of the leaching solution of the uranium ore drops below 5 mg / L, the leaching is terminated;

[0055] The obtained leaching solution is subjected to ion exchange adsorption to extract uranium, using strong basic anion resin 201x7, using fixed bed or moving bed clear liquid ion exchange process, and the concentration of uranium in the final qualified liquid is greater than 10g / L; solvent extraction method is used to extract uranium, usi...

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Abstract

The present invention provides a waste minimization method suitable for use in acid heap leaching mines. Its steps: (1) crush the uranium ore to a certain particle size, and leach the uranium ore according to the acid heap leaching process; (2) when the uranium concentration of the uranium ore leach solution drops below 5 mg / L, the leaching is completed; the obtained leach solution Perform ion exchange adsorption to extract uranium; transfer the heap leaching tailings obtained to the tailings storage; (3) spray the heap leaching tailings transferred to the tailings storage with the obtained ion exchange adsorption tailings or raffinate water (4) After replenishing leaching agent and oxidant to the tailings effluent, return to the acid heap leaching process to leach uranium ore; (5) After the overall leaching operation of the uranium mine is completed, add The neutralizer is neutralized and decommissioned. The invention reduces the generation of waste water and waste residues, improves the comprehensive utilization rate of materials, reduces reagent consumption, saves production costs, and improves the overall uranium recovery rate.

Description

technical field [0001] The invention belongs to the technical field of uranium ore leaching in uranium hydrometallurgy, and in particular relates to a method for minimizing waste in mine tailings storages by acid heap leaching. Background technique [0002] Since the 1990s, with the adjustment of my country's uranium mining and metallurgy structure, acid heap leaching has become the main process of hard rock uranium production in my country. After the leaching operation is completed, the current tailings treatment method is to carry out neutralization treatment before the tailings enter the tailings storage. That is, after the leaching period is over, water is added to spray and rinse the ore heap, and then the heap is unloaded, and the unloaded leaching slag is neutralized by a neutralizing agent such as lime, and then stored in the tailings pond permanently. However, due to the large particle size of the ore in heap leaching and the generally long heap leaching period, du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B60/02C22B3/08C22B3/42C22B3/38
CPCC22B3/08C22B3/42C22B60/0234C22B3/3846Y02P10/20
Inventor 孟舒钟平汝吴永永刘津麟
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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