Method for removing ionic rare earth ore ammonia nitrogen pollution in situ by using eluting agent
An ionic rare earth ore and leaching agent technology, applied in the direction of improving process efficiency, etc., can solve problems such as difficulty in removing residual ammonium salts, large dosage, incomplete leaching, etc.
Active Publication Date: 2021-05-18
江西离子型稀土工程技术研究有限公司
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Problems solved by technology
After the leaching of ionic rare earth ore, a large amount of leaching agent ammonium salt remains in the ore body, and is released into the surrounding environment slowly and for a long time under the action of rainwater leaching, causing serious ammonia nitrogen pollution.
[0004]
Ionic rare earth mines often involve a large area of soil, and it is difficult to remove residual ammonium salts by traditional soil remediation techniques such as topsoil removal and solidification.
Clean water is generally used in the industry to wash mines to remove ammonia nitrogen, but the injection time of clean water is long, the amount of water used is large, and the washing is not complete. After washing, some ammonium salt residues will still be released slowly with rainfall, polluting the surrounding environment
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Embodiment 1
[0033] The ore leaching column device is used to simulate the mine leaching and leaching process. The ore leaching column device is cylindrical in shape with an inner diameter of 10 cm and a height of 100 cm. The material of the ore leaching column is plexiglass. The upper end of the ore leaching column is connected to a plastic bucket filled with leaching agent through a plastic hose, and the lower end uses a beaker to receive the leachate.
[0034] The raw ore of an ion-type rare earth mine in Longnan, Ganzhou, Jiangxi Province was mined back to the laboratory for a simulated ion-type rare earth ore leaching experiment. Among them, the content of rare earth ions in the ionic rare earth ore is 0.02wt%, and the content of ammonium ions is 0.0384wt%.
[0035] The simulated leaching and rinsing process includes the following steps:
[0036] (1) Weigh 5.0kg of ionic rare earth ore, and evenly load it into the ore leaching column device. During the filling process, gently squeez...
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The invention provides a method for removing ionic rare earth ore ammonia nitrogen pollution in situ through an eluting agent, and belongs to the technical field of mine ecological environment restoration. According to the method, after the ammonium sulfate ore leaching process is completed, leacheate is added into a liquid injection well of the in-situ ore leaching process for leaching ionic rare earth ore. According to the method, one or more of calcium chloride, potassium chloride, sodium chloride, sodium carbonate, potassium carbonate, magnesium sulfate, aluminum sulfate, ferric sulfate, citric acid, saponin and saponin are used as the eluting agent, residual ammonium nitrogen in the waste ionic rare earth mine can be rapidly removed, the cost is low, the method is friendly to the soil environment, and secondary pollution is avoided; and the in-situ leaching mode is adopted, the ammonium sulfate liquid injection well used in the ammonium sulfate ore leaching process is used for leaching, extra manufacturing cost of leaching equipment is avoided, and the method is easy to operate, efficient and environmentally friendly.
Description
technical field [0001] The invention relates to the technical field of mine ecological environment restoration, in particular to a method for in-situ removal of ammonia nitrogen pollution from ionic rare earth mines by elutriants. 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, but there is an ...
Claims
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Login to View More IPC IPC(8): C22B59/00C22B3/14
CPCC22B59/00C22B3/14Y02P10/20
Inventor 王林生王慧娟汪江萍黄金邓扬悟肖信锦
Owner 江西离子型稀土工程技术研究有限公司