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Process for cascade leaching of ammonia nitrogen in ionic rare earth tailings

An ionic rare earth, leaching technology, applied in the direction of improving process efficiency, can solve problems such as ammonia nitrogen tailing, and achieve the effects of low production cost, low impurity content, and high rare earth leaching rate

Active Publication Date: 2021-12-10
江西离子型稀土工程技术研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to develop a fast, effective, and low-cost method for removing residual ammonia nitrogen in the tailings of ion-type rare earth ore using ammonium sulfate leaching, so as to solve the long-term delay of ammonia nitrogen in ion-type rare earth tailings under factors such as rainwater leaching. Tail question

Method used

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  • Process for cascade leaching of ammonia nitrogen in ionic rare earth tailings
  • Process for cascade leaching of ammonia nitrogen in ionic rare earth tailings
  • Process for cascade leaching of ammonia nitrogen in ionic rare earth tailings

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Ammonium sulfate is used as a leaching agent to simulate the cascade leaching of ionic rare earth tailings. The experimental process includes the following steps:

[0038] (1) Weigh a certain amount of ion-type rare earth tailings ore soil, smash it through a 20-mesh sieve, mix it evenly, weigh 40g of the treated ion-type rare earth tailings ore soil and fill it into the same four exchange columns Inside, numbered A / B / C / D, add 20ml of deionized water to moisten the ore soil to facilitate subsequent full rinsing;

[0039] (2) Add a magnesium sulfate solution with a mass concentration of 2% to the A column for gradation washing, each injection volume is 50ml, and the liquid collection volume is 50ml, numbered A1, A2, A3, ..., respectively measure the eluate When the concentration of ammonia nitrogen in the eluent is less than 15mg / L, stop injecting;

[0040] (3) According to the cascade elution process, the second eluent of column A is used as the first eluent of column B ...

Embodiment 2

[0046] Potassium chloride is used as a leaching agent to simulate the cascade leaching of ionic rare earth tailings. The experimental process includes the following steps:

[0047] (1) Weigh a certain amount of ion-type rare earth tailings ore soil, smash it through a 20-mesh sieve, mix evenly, weigh 40g of the treated ion-type rare earth tailings ore soil and fill it into the same four exchange columns Inside, numbered A / B / C / D, add 20ml of deionized water to moisten the ore soil to facilitate subsequent full rinsing;

[0048] (2) Add a potassium chloride solution with a mass concentration of 2% in the A column for leaching in several stages, each injection volume is 50ml, and the liquid collection volume is 50ml, numbered A1, A2, A3, ..., measure the leaching respectively When the concentration of ammonia nitrogen in the eluent is less than 15mg / L, stop injecting;

[0049] (3) According to the cascade elution process, the second eluent of column A is used as the first eluent...

Embodiment 3

[0055] Ferric sulfate is used as a leaching agent to simulate the cascade leaching of ionic rare earth tailings. The experimental process includes the following steps:

[0056] (1) Weigh a certain amount of ion-type rare earth tailings ore soil, smash it through a 20-mesh sieve, mix evenly, weigh 40g of the treated ion-type rare earth tailings ore soil and fill it into the same four exchange columns Inside, numbered A / B / C / D, add 20ml of deionized water to moisten the ore soil to facilitate subsequent full rinsing;

[0057] (2) Add a ferric sulfate solution with a mass concentration of 2% in the A column for gradation washing, each injection volume is 50ml, and the liquid collection volume is 50ml, numbering A1, A2, A3,..., measure the eluent respectively When the concentration of ammonia nitrogen in the eluent is less than 15mg / L, stop injecting;

[0058] (3) According to the cascade elution process, the second eluent of column A is used as the first eluent of column B for el...

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Abstract

The invention belongs to the field of mine environmental protection treatment, and discloses a process for cascade leaching of ammonia nitrogen in ionic rare earth tailings. The process comprises the following steps of (1) preparing a leaching solution; (2) dividing the ionic rare earth tailings subjected to ammonium sulfate in-situ leaching into different small areas according to the areas, and making marks; (3) carrying out cascade leaching, and stopping liquid injection when the concentration of ammonia nitrogen in the leaching solution is less than 15mg / L as a leaching end point; and (4) after the leaching of each area reaches the leaching end point, adding top water again to elute the redundant leaching agent in the ore body, and adding a proper amount of leaching agent into the eluted washing water to prepare the leaching agent for recycling. According to the process for cascade leaching of the ammonia nitrogen in the ionic rare earth tailings provided by the invention, the problem of long-term tailing of residual ammonia nitrogen in the ionic rare earth tailings caused by factors such as rainwater leaching can be solved in a centralized leaching manner; and through a cascade leaching mode, the agent dosage and the liquid-solid ratio in the leaching process can be reduced, and the leaching agent cost and the subsequent ammonia-nitrogen wastewater treatment cost are reduced.

Description

technical field [0001] The invention belongs to the field of mine environmental protection management, and relates to a process for serially leaching ammonia nitrogen in ionic rare earth tailings. Background technique [0002] Ionic rare earth minerals are rich in medium and heavy rare earth elements that are indispensable in high-tech industries such as national defense, new materials, and aerospace. They are globally recognized non-renewable mineral resources that are related to the development of emerging industries. Since the development of the ionic rare earth ore extraction process, the ammonium salt system in-situ leaching process of "ammonium sulfate leaching-ammonium bicarbonate precipitation" has been widely used. As a leaching agent, ammonium sulfate has a series of advantages such as low production cost, high rare earth leaching rate, low impurity content in leach solution, and high purity of rare earth products. Under the action of other factors, the ammonia ni...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/14
CPCC22B59/00C22B3/14Y02P10/20
Inventor 肖信锦王慧娟黄金邓扬悟谢芳芳郭安
Owner 江西离子型稀土工程技术研究有限公司
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