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Treatment technology of low-content radioactive pollutants in rare-earth smelting wastewater

A pollutant treatment and low-content technology is applied to the treatment process of uranium radioactive pollutant wastewater, the treatment process of low-content radioactive pollutants in rare earth smelting wastewater, and the field of thorium, and achieves improved treatment effect, low cost, and process flow. simple effect

Inactive Publication Date: 2019-04-16
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the many deficiencies in the existing methods for treating low-content radioactive pollutants in rare earth smelting wastewater, the purpose of the present invention is to provide a treatment process for low-content radioactive pollutants in rare earth smelting wastewater, which can not only effectively reduce and remove waste water The low content of radioactive pollutants in the medium can also reduce the process cost and improve the treatment efficiency

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  • Treatment technology of low-content radioactive pollutants in rare-earth smelting wastewater
  • Treatment technology of low-content radioactive pollutants in rare-earth smelting wastewater

Examples

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Embodiment 1

[0035] In the radioactive wastewater discharged by a rare earth enterprise, the concentrations of uranium and thorium were 1.53mg / L and 1.85mg / L respectively, and the pH value was 9.4.

[0036] A process for treating low-level radioactive pollutants in rare earth smelting wastewater, comprising the following steps:

[0037] 1) Adjust the rare earth smelting wastewater to neutral or slightly alkaline; use 1mol / L dilute sulfuric acid to adjust the pH of the rare earth smelting wastewater to 7-9;

[0038] 2) In the solution obtained in step 1), add 40g of medicament A (BaCl 2 2H 2 O), after stirring and reacting with 0.3L of agent B (concentrated sulfuric acid), add 5g of agent C (polyacrylamide flocculant) and stir and mix evenly. After precipitation occurs, solid-liquid separation is carried out to obtain waste residue and supernatant. 1h;

[0039] 3) The supernatant liquid obtained from the solid-liquid separation in step 2) flows through the fixed activated carbon adsorpti...

Embodiment 2

[0042] In the radioactive wastewater discharged by a rare earth enterprise, the concentrations of uranium and thorium were 1.66mg / L and 6.59mg / L respectively, and the pH value was 3.6.

[0043] A process for treating low-level radioactive pollutants in rare earth smelting wastewater, comprising the following steps:

[0044] 1) First, adjust the rare earth smelting wastewater to pH 7-9 with liquid caustic soda;

[0045] 2) In the solution obtained in step 1), add 60g of medicament A (BaCl 2 2H 2 0), after stirring and reacting 0.6L of medicament B (concentrated sulfuric acid), add 10g of medicament C (polyacrylamide flocculant) and mix evenly. After fixing the activated carbon adsorption bed, the final effluent is obtained after activated carbon adsorption, and the reaction time is 0.5~1h;

[0046]3) The supernatant liquid obtained from the solid-liquid separation in step 2) flows through the fixed activated carbon adsorption bed, and after the activated carbon adsorption, t...

Embodiment 3

[0049] In the radioactive wastewater discharged by a rare earth enterprise, the concentrations of uranium and thorium were 1.72mg / L and 4.38mg / L respectively, and the pH value was 5.3.

[0050] A process for treating low-level radioactive pollutants in rare earth smelting wastewater, comprising the following steps:

[0051] 1) First, adjust the rare earth smelting wastewater to pH 7-9 with liquid caustic soda;

[0052] 2) In the solution obtained in step 1), add 50g of medicament A (BaCl 2 2H 2 0), after stirring and reacting 0.5L of medicament B (concentrated sulfuric acid), add 8g of medicament C (polyacrylamide flocculant) and mix evenly. After precipitation occurs, solid-liquid separation is carried out to obtain waste residue and supernatant. After fixing the activated carbon adsorption bed, the final effluent is obtained after activated carbon adsorption, and the reaction time is 0.5~1h;

[0053] 3) The supernatant liquid obtained from the solid-liquid separation in s...

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Abstract

The invention discloses a treatment technology of low-content radioactive pollutants in rare-earth smelting wastewater, and belongs to the technical field of radioactive wastewater treatment. According to the technology, the rare-earth smelting wastewater is adjusted to be neutral or slightly alkaline, and barium ions and sulfate ions are added, so that radium and other radioactive substances in the wastewater are primarily removed through co-precipitation; by adding a flocculating agent, precipitation is accelerated, and the time and cost required by precipitation are reduced; at the same time, a small part of low-content radioactive substances still existing after precipitation are further adsorbed and removed by using a fixed activated carbon adsorption bed, and after technical treatment, the radioactive substances in the wastewater can be discharged up to the standard. According to the technology, the characteristics of different treatment modes are fully utilized, the process costis reduced and the treatment efficiency are improved while the low-content radioactive pollutants in the wastewater are reduced and removed, and the application value is remarkable.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste water treatment, and in particular relates to a treatment process for low-content radioactive pollutants in rare earth smelting waste water, in particular to a treatment process for waste water containing thorium and uranium radioactive pollutants produced in the rare earth industry. Background technique [0002] With the rapid development of the economy, people's attention to my country's rare earth resources is also increasing. While the rare earth industry is developing rapidly, it also encounters some problems. Among them, the problem of "three wastes" produced in the smelting and separation process of rare earths has become increasingly prominent, especially the environmental problems caused by the wastewater produced by them are more serious. These wastewaters are produced in large quantities, have complex components, and have many types of pollutants. If they are not disposed of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/281C02F1/283C02F1/56C02F1/66C02F9/00C02F2101/006C02F2103/16
Inventor 晏波雷畅陈涛王明辉林翰志
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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