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Process method for treating rare earth wastewater

A process method and wastewater technology, which is applied in filtration treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of low ammonia nitrogen reduction rate, inability to remove ammonia nitrogen and heavy metal ion content at the same time, and achieve high ammonia nitrogen reduction rate Effect

Inactive Publication Date: 2020-04-17
中稀(寿光)资源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In summary, in the prior art, there are defects in the processing method of rare earth wastewater: (1) COD, ammonia nitrogen and heavy metal ion content in the wastewater cannot be removed at the same time; (2) when ammonia nitrogen is removed, the reduction rate of ammonia nitrogen is low

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  • Process method for treating rare earth wastewater
  • Process method for treating rare earth wastewater
  • Process method for treating rare earth wastewater

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Embodiment 1

[0044] Example 1 A process for treating rare earth wastewater

[0045] A process method for treating rare earth wastewater according to the present invention comprises rare earth wastewater preparation, acidification treatment, catalytic oxidation, alkalization treatment, pressure filtration and post-treatment steps, specifically:

[0046] 1) Preparation of rare earth wastewater: inject 60m³ of rare earth wastewater into the wastewater reaction tank;

[0047] The content of ammonia nitrogen in the rare earth wastewater is 714mg / l, the content of COD is 1454mg / L, and the content of lead and zinc is 2mg / L;

[0048] 2) Acidification treatment: add an appropriate amount of hydrochloric acid to adjust the pH value to 3;

[0049] 3) Catalytic oxidation: Turn on the stirring and heating system, add the amount of ammonia nitrogen remover and sodium hypochlorite solid to the reaction tank, the reaction time is 120min, and the reaction temperature is 70°C;

[0050]The add-on of descri...

Embodiment 2

[0056] Embodiment 2: A kind of processing method of rare earth wastewater

[0057] 1 Rare earth wastewater preparation: Inject 60m³ of rare earth wastewater into the wastewater reaction tank. The ammonia nitrogen content in the wastewater is 805mg / l, the COD content is 1480mg / L, and the total lead and zinc content is 2.2mg / L;

[0058] 2. Acidification treatment: Add appropriate amount of hydrochloric acid to adjust the pH value to 3.5;

[0059] 3. Catalytic oxidation: Turn on the stirring and heating system, add a certain amount of sodium hypochlorite and ammonia nitrogen remover to the reaction pool, the reaction time is 120min, and the reaction temperature is 70°C;

[0060] Addition amount of ammonia nitrogen remover: 8 kg×60=480kg. After the reaction is completed, when the ammonia nitrogen content in the pool is less than 100ppm, add sodium hypochlorite according to the standard that sodium hypochlorite can be reduced by 13ppm per kilogram of sodium hypochlorite per cubic w...

Embodiment 3

[0065] Embodiment 3: A kind of processing method of rare earth wastewater

[0066] 1 Rare earth wastewater preparation: Inject 60m³ of rare earth wastewater into the wastewater reaction tank. The content of ammonia nitrogen in the wastewater is 828mg / l, the content of COD is 1476mg / L, and the content of lead and zinc is 1.8mg / L;

[0067] 2. Acidification treatment: Add appropriate amount of hydrochloric acid to adjust the pH value to 3;

[0068] 3. Catalytic oxidation: Turn on the stirring and heating system, add a certain amount of sodium hypochlorite and ammonia nitrogen remover to the reaction pool, the reaction time is 120min, and the reaction temperature is 70°C;

[0069] The amount of ammonia nitrogen remover added: 8×60=480kg. After the reaction is completed, when the ammonia nitrogen content in the pool is less than 100ppm, add sodium hypochlorite according to the standard that sodium hypochlorite can be reduced by 13ppm per kilogram of sodium hypochlorite per cubic wa...

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Abstract

The invention provides a technological method for treating rare earth wastewater. The technological method comprises the steps of rare earth wastewater preparation, acidification treatment, catalyticoxidation, alkalization treatment and filter pressing. In the catalytic oxidation process, the ammonia nitrogen reduction rate is 100 ppm / kg, and an ammonia nitrogen remover is 13-15 ppm / kg of sodiumhypochlorite; in the step of alkalization treatment, calcium oxide is added, the PH value is controlled to be about 9, a reaction is conducted for 30 min, and the reaction time is 90-120 min. After treatment, the concentration of ammonia nitrogen is 9-13 mg / L, the concentration of COD is 42-50 mg / L, and the concentration of heavy metal is 0.011-0.04 mg / L. According to the process method for treating the rare earth wastewater, COD, ammonia nitrogen and heavy metal ions in the wastewater generated in the rare earth extraction process can be effectively removed at the same time, when the ammonianitrogen is removed, the ammonia nitrogen reduction rate is high, and the process method has the characteristics of being remarkable in treatment effect and large in application range.

Description

technical field [0001] The invention relates to a process method for treating rare earth wastewater, and relates to the technical field of clean production for post-treatment of rare earth production wastewater. Background technique [0002] In the rare earth industry, the wastewater generated during the process of extracting and using oxalic acid to produce oxalate contains a large amount of COD, ammonium ions, and also contains a certain amount of heavy metal ions such as lead, zinc, and rare earth. Direct discharge treatment will directly affect the environment. At present, in response to the requirements of the sewage treatment plant, the ammonia nitrogen of the wastewater discharged to the sewage treatment plant is less than 15mg / L, and the COD is less than 60mg / L. Need, invented a day to meet the company's current requirements for the treatment of wastewater technology. [0003] The Chinese patent with the publication number CN108069541A provides a continuous process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/16C02F101/20
CPCC02F1/001C02F1/66C02F1/725C02F9/00C02F2101/16C02F2101/20C02F2209/08
Inventor 郑理杰李常清孙国璐梁飞展
Owner 中稀(寿光)资源科技有限公司
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