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A kind of ammonium ion eluent and its application

A leaching agent and leaching technology, applied in the restoration of polluted soil, etc., can solve the problems of high construction cost, high operating cost, ammonia nitrogen pollution and other problems of biological treatment of ammonia nitrogen wastewater, and achieve suitable for popularization and use, water consumption The effect of few, cheap and easy-to-obtain raw materials

Active Publication Date: 2021-12-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the construction cost of biological treatment of ammonia nitrogen wastewater is relatively high. At the same time, the ammonia nitrogen wastewater of rare earth mines is inorganic wastewater with low carbon content. The biological treatment process needs to add carbon sources, resulting in extremely high operating costs. government can't afford
In addition, the treatment of ammonia-nitrogen wastewater in small watersheds outside rare earth mines is actually a post-pollution treatment method. In fact, the ammonia nitrogen in small watersheds has entered the water body under rainwater leaching from rare earth leaching sites. Some rare earth mines have been mined for more than 10 years, but The ammonia nitrogen in the nearby small watershed seriously exceeds the standard of 100mg / L, which cannot solve the local ammonia nitrogen pollution problem in a short time

Method used

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  • A kind of ammonium ion eluent and its application
  • A kind of ammonium ion eluent and its application
  • A kind of ammonium ion eluent and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Weigh 5g FeSO 4 ·7H 2 O and 1.0g MgSO 4 ·7H 2 O, dissolved in 1.5L deionized water, adjusted to pH 5.5 with 5% NaOH solution to obtain eluent;

[0055] (2) Take 750g soil sample to make an exchange column, use the eluent obtained in step (1) to rinse the exchange column at a rate of 60mL / h, and collect the eluate to analyze the ammonia nitrogen in the eluate And rare earth content, as shown in table 2;

[0056] (3) Take the above-mentioned eluent, add lime (100 mesh) powder to adjust to pH=9, stir for 20 minutes and filter to obtain the precipitate and filtrate, and analyze the filtrate, that is, the content of iron, magnesium, ammonia nitrogen and rare earth in the impurity removal liquid, The result is shown in table 2;

[0057] (4) to step (3) gained filtrate according to Na 2 HPO 4 12H 2 O and NH in the filtrate 4 + The molar ratio is 1:1 to add Na 2 HPO 4 12H 2 O, stirred at room temperature for 20 minutes, filtered to obtain struvite (MgNH 4 PO ...

Embodiment 2

[0065] (1) Weigh 5g FeCl 2 4H 2 O and 0.5g MgCl 2 ·6H 2 O, dissolved in 11L deionized water, adjusted to pH 4 with 5% NaOH solution to obtain eluent;

[0066] (2) Take 2.2kg soil sample to make an exchange column, and use the eluent obtained in step (1) to rinse the exchange column at a liquid inlet rate of 60mL / h. Ammonia nitrogen and rare earth content, as shown in Table 3;

[0067] (3) Take the above eluate, add lime (100 mesh) powder to adjust to pH=8.5, stir for 20 minutes and filter to obtain the precipitate, and analyze the content of iron, magnesium, ammonia nitrogen and rare earth in the filtrate, the results are shown in Table 3;

[0068] (4) to step (3) gained filtrate according to Na 2 HPO 4 12H 2 O and NH in the filtrate 4 + The molar ratio is 1:1 to add Na 2 HPO 4 12H 2 O, stirred at room temperature for 20 minutes, filtered to obtain struvite (MgNH 4 PO 4 ·6H 2 (0) precipitate, analyze the ammonia nitrogen content in the filtrate, can calculate th...

Embodiment 3

[0075] (1) Weigh 5g FeSO 4 ·7H 2 O, 1.5g MgSO 4 ·7H 2 O and 1.0g MgCl 2 ·6H 2 O, dissolved in 1.5L deionized water, adjusted to pH 6 with 5% NaOH solution to obtain eluent;

[0076] (2) Take a 1.5Kg soil sample to make an exchange column, use the eluent obtained in step (1) to rinse the exchange column at a liquid inlet rate of 60mL / h, and collect the eluate to analyze the eluate Ammonia nitrogen and rare earth content, as shown in table 4;

[0077] (3) Take the above eluate, add lime (100 mesh) powder to adjust to pH=10, stir for 20 minutes and filter to obtain the precipitate, and analyze the iron, magnesium, ammonia nitrogen and rare earth content in the filtrate, the results are shown in Table 4;

[0078] (4) to step (3) gained filtrate according to Na 2 HPO 4 12H 2 O and NH in the filtrate 4 + The molar ratio is 1:1 to add Na 2 HPO 4 12H 2 O, stirred at room temperature for 20 minutes, filtered to obtain struvite (MgNH 4 PO 4 ·6H 2 (0) precipitate, analyz...

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Abstract

The invention discloses an ammonium ion leaching agent and an application thereof, belonging to the technical field of environmental protection. The ammonium ion leaching agent comprises ferrous salt and magnesium salt with a weight ratio of 10:(1-5), And it is applied to the leaching of the residual ammonium ion in the ionic rare earth ore leaching site, comprising the following steps: adding the ammonium ion leaching agent to the leaching column made of the soil sample in the ionic rare earth ore leaching site for leaching, Add lime to the resulting eluate, react, filter, and then add Na to the filtrate 2 HPO 4 , can be filtered; the present invention can realize the elution of more than 90% water-soluble and exchangeable ammonia nitrogen in the soil sample, and the replacement rate of the residual rare earth in the soil sample is also more than 90%, and the lime precipitation can further recover the rare earth; The sedimentation rate is greater than 88%; the final deammonization filtrate is backwashed, and the soil pH value reaches above 6.5. The method of the invention is beneficial to the soil restoration of the ore leaching site and the comprehensive utilization of resources.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an ammonium ion rinsing agent and an application thereof. Background technique [0002] Ion-adsorbed rare earth ores are rich in medium and heavy rare earth elements and can be used in high-tech fields such as electronic communications, aerospace, and military affairs, and are a mineral resource of very important strategic significance. Ionic rare earth mining mainly uses ammonium sulfate as the leaching agent. Before 2007, pool leaching and heap leaching were the main methods, and then the in-situ leaching process was fully used. When ionic rare earths are mined, excessive ammonia nitrogen is absorbed into the soil in the mining area. Research has found that the ammonia nitrogen in the mining field and nearby areas can be as high as 0.97kg / t during mining, and the ammonium nitrogen content in 1cm to 20cm soil is still as high as 1.21kg / t after 3 year...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08B09C2101/00
Inventor 朱国才胡湖生
Owner TSINGHUA UNIV