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A preparation method for a coal gangue-based composite adsorbent capable of removing mercury in waste water

A composite adsorption and coal gangue technology, applied in chemical instruments and methods, adsorption water/sewage treatment, silicon compounds, etc., can solve the problem of non-specificity in the removal of mercury pollutants, achieve easy control of conditions, reduce treatment costs, The effect of simple process

Active Publication Date: 2015-03-04
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as Chinese patent CN1060585C (method for preparing silica gel-activated carbon composite adsorbent from coal gangue), Chinese patent CN1116106C (preparation of activated carbon-zeolite composite from coal gangue), Chinese patent CN101274267A (a new process for making adsorption materials by activating coal gangue) Both process coal gangue to produce adsorbent materials, but the adsorbent prepared by the above method has no specificity for the removal of mercury pollutants in wastewater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The raw coal gangue is pulverized and ground to 40 meshes, and placed in an impregnation tank at room temperature. The volume of coal gangue powder injected is 3 / 4 of the volume of the impregnation tank. After the coal gangue powder is put, a 0.1 mol / L sodium hydroxide alkaline aqueous solution is injected into the immersion tank, and the volume ratio of the alkaline aqueous solution to the coal gangue powder is 1.5. Stir the coal gangue powder and the alkaline aqueous solution thoroughly, and immerse the coal gangue powder in the alkaline aqueous solution for 3 hours. After the immersion is completed, the alkaline aqueous solution is discharged, and the coal gangue powder is washed with clean water with a conductivity of less than 5μS / cm, and the washing is stopped when the pH value of the effluent after washing reaches 9. After filtering, the undried coal gangue powder is directly placed in a microwave calciner for calcination and activation for 2 hours, and the temper...

Embodiment 2

[0019] The raw coal gangue is crushed and pulverized to 60 meshes, and placed in an impregnation tank at room temperature. The volume of coal gangue powder injected is 1 / 4 of the volume of the impregnation tank. After the coal gangue powder is put in, a 0.5 mol / L sodium carbonate alkaline aqueous solution is injected into the immersion tank, and the volume ratio of the alkaline aqueous solution to the coal gangue powder is 1.8. The coal gangue powder and the alkaline aqueous solution are fully stirred evenly, and the coal gangue powder is immersed in the alkaline aqueous solution for 10 hours. After the immersion is completed, the alkaline aqueous solution is discharged, and the coal gangue powder is washed with water with a conductivity of less than 5μS / cm, and the washing is stopped when the pH value of the effluent after washing reaches 9. After filtering, the undried coal gangue powder is directly placed in a microwave calciner for calcination and activation for 5 hours, an...

Embodiment 3

[0021] The raw coal gangue is pulverized and ground to 50 meshes, and placed in an impregnation tank at room temperature. The volume of coal gangue powder injected is 1 / 2 of the volume of the impregnation tank. After the coal gangue powder is put in, a 0.2mol / L alkaline aqueous solution of potassium hydroxide is injected into the immersion tank, and the volume ratio of the alkaline aqueous solution to the coal gangue powder is 1.2. The coal gangue powder and the alkaline aqueous solution are fully stirred evenly, and the coal gangue powder is immersed in the alkaline aqueous solution for 1 hour. After the immersion is completed, the alkaline aqueous solution is discharged, and the coal gangue powder is washed with water with a conductivity of less than 5μS / cm, and the washing is stopped when the pH value of the effluent after washing reaches 10. After filtering, the undried coal gangue powder is directly placed in a microwave calciner for calcination and activation for 2 hours,...

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PUM

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Abstract

The invention relates to a preparation method for a coal gangue-based composite adsorbent capable of removing mercury in waste water. Coal gangue is dipped by using an alkaline solution after the coal gangue is smashed and levigated. The dipped coal gangue is washed with clear water until the pH is 9-10. After filtration or centrifugal separation, the coal gangue is put into a microwave calcinatory and is subjected to microwave calcination and activation at a certain temperature for 2-5 h. The coal gangue is mixed with polymeric ferric sulfate, and grinded by a ball grinding mill into nanoscale particles, then the particles can be used for treating the mercury-containing waste water. The mercury content in the treated water can reach the national emission standards. According to the method, the coal gangue which is solid waste of coal mining is used for treating the mercury in the mercury-containing waste water, thereby reducing the treatment cost for the mercury-containing waste water, performing secondary utilization for the solid waste coal gangue and having multiple benefits such as environmental protection, economy, etc..

Description

Technical field [0001] The invention relates to a preparation method of a coal gangue-based composite adsorbent capable of removing mercury in waste water. Background technique [0002] Mercury and other heavy metal pollutants are extremely harmful to the human body. Because of their specific physical and chemical properties, mercury and other heavy metal pollutants are widely used in metallurgy, chemistry, electrical, instrumentation, and military industries, which leads to the deposition of a large amount of mercury. After being in the environment, it is not easy to be biodegraded, and it is contaminated by soil and water, especially through the food chain, which is enriched in the organism, causing serious harm to the human body and other organisms. Therefore, removing or reducing heavy metal pollutant ions such as mercury in wastewater has become an important task in the field of heavy metal pollution control. [0003] Coal gangue is the waste produced in the process of coal m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F1/62
Inventor 郭少青高丽兵何秋生郭亚兵曹艳芝
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY