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Method and system for removing ammonia nitrogen from ionic mixed rare earth feed liquid

A technology for mixing rare earth and rare earth feed liquid, which is applied in the field of removing ammonia nitrogen and removing ammonia nitrogen, can solve the problems of excessive concentration of unorganized concentration at the factory boundary, odor pollution of ammonia gas, and high pollution control cost, so as to avoid the loss of rare earth elements and eliminate the Odor pollution, high removal rate of ammonia nitrogen

Active Publication Date: 2015-08-26
GANZHOU NONFERROUS METALLURGICAL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the amount of ammonia nitrogen removal from terminal sewage is huge, and the cost of pollution control is very high
On the other hand, as the pH value increases, the ammonium ions in the wastewater will be converted into ammonia gas and escape, resulting in ammonia odor pollution in the factory environment and excessive fugitive concentration at the factory boundary

Method used

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  • Method and system for removing ammonia nitrogen from ionic mixed rare earth feed liquid
  • Method and system for removing ammonia nitrogen from ionic mixed rare earth feed liquid
  • Method and system for removing ammonia nitrogen from ionic mixed rare earth feed liquid

Examples

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Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: Take 10Kg of mixed rare earth carbonate, control the amount of industrial hydrochloric acid, and obtain a rare earth feed solution with a rare earth concentration of 0.95 mol / L and a pH value of 4.5, and the measured amount of ammonia nitrogen in the rare earth feed liquid is 410 mg / L. Take 500mL of the rare earth material liquid for testing, according to the ratio of the amount of substances n ClO- :n NH4+ The amount of sodium hypochlorite was added at one time in different proportions, and stirred for 30 minutes. The results are shown in Table 1, and the data plotted as image 3 shown. From Table 1 and image 3 It can be seen that with the increase of sodium hypochlorite addition, the ammonia nitrogen content in the feed liquid gradually decreases, when n ClO- :n NH4+ When the ratio is greater than 3:1, the removal rate of ammonia nitrogen can reach more than 90%. Therefore, considering the removal rate and cost of ammonia nitrogen comprehensively, th...

Embodiment 2

[0050] Example 2: Take 10Kg of mixed rare earth carbonate, control the amount of industrial hydrochloric acid, and obtain a rare earth feed liquid with a rare earth concentration of 1.45 mol / L and a pH value of 1.5, and the ammonia nitrogen content of the rare earth feed liquid is 315 mg / L. According to the ratio of the amount of substance n ClO- :n NH4+ =3:1 Add the amount of sodium hypochlorite in 4 times, and the reaction is stirred for 1 hour in total. After the reaction, the concentration of ammonia nitrogen in the feed liquid is 2.5 mg / L, and the removal rate of ammonia nitrogen reaches 99.21%. Before and after the ammonia nitrogen removal reaction, the color of the feed liquid changes, and after the breakpoint chlorination removes ammonia nitrogen, the feed liquid becomes more transparent and clear.

Embodiment 3

[0051] Embodiment 3: take by weighing the rare earth carbonate of 0.6kg (water content is 76%), add 480ml pure water, then slowly add 250ml industrial hydrochloric acid (concentration is 30%), stir until rare earth carbonate is all dissolved, record the ratio of rare earth feed liquid The pH is 0.95, the concentration of ammonia nitrogen is 212mg / L, and the total amount of rare earth is 0.51mol / L. Get rare earth material liquid 500ml, add 25ml proportioning compound oxidant (hypochlorous acid and compound 50g, ozone feed rate are 5m 3 / h), aerated and stirred for 60min, centrifuged, and measured the data of the supernatant, the pH was 3.74, the ammonia nitrogen concentration was 14mg / L, the ammonia nitrogen removal rate reached 93.4%, and the total amount of rare earth was 0.51mol / L.

[0052] Embodiment 4: take by weighing the rare earth carbonate of 1kg (water content is 76%), slowly add 600ml industrial hydrochloric acid (concentration is 30%), stir until rare earth carbonat...

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Abstract

The invention discloses a method for removing ammonia nitrogen from ionic mixed rare earth feed liquid. The method is characterized by comprising the following steps: decomposing ionic mixed rare earth to obtain mixed rare earth feed liquid; adding complex oxidants into the mixed rare earth feed liquid in batches according to the mass ratio of N oxidizing agent to N<NH4+> being equal to (2-30):1, and performing tail gas treatment on produced gas; filtering the feed liquid subjected to ammonia nitrogen removal, so as to obtain the clear rare earth feed liquid. The method has the advantage that the content of ammonia nitrogen is reduced from the source, so that a subsequent sewage ammonia nitrogen treatment process is avoided, the sewage treatment cost is reduced, and treatment up-to-standard release is achieved.

Description

technical field [0001] The invention relates to a method and system for removing ammonia nitrogen from ionic mixed rare earth feed liquid, especially for treating southern ionic mixed rare earth feed liquid. It is a novel process for removing ammonia nitrogen and belongs to the technical field of hydrometallurgy. Background technique [0002] At present, in the smelting and production of ionic mixed rare earths in the south, ammonia-free saponification is used for organic saponification, and oxalic acid or sodium bicarbonate is used for single rare earth precipitation. The production of ionic mixed rare earth carbonate adopts ammonium sulfate leaching and ammonium bicarbonate enrichment precipitation process, so that the obtained ionic mixed rare earth carbonate inevitably contains a large amount of ammonium ions. Therefore, the ammonia nitrogen in the subsequent rare earth smelting process mainly comes from mixed rare earth carbonates. [0003] In production practice, one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/44C22B3/02
CPCY02P10/20
Inventor 张选旭韩正昌杨新华陈冬英赖耀斌马军军陈淑梅高亚娟赖兰萍周洁英陈后兴洪侃伍莺温翔
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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