Gasified slag-based composite ammonia nitrogen adsorbent, preparation method, regeneration method and application thereof, and method for treating ammonia nitrogen-containing wastewater

A technology for ammonia nitrogen wastewater and gasification slag, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of expensive raw materials, secondary pollution, magnesium ion ammonia nitrogen entering ammonia nitrogen wastewater, etc., to achieve The effect of low preparation cost, simple process and good ammonia nitrogen adsorption performance

Active Publication Date: 2021-08-24
CHINA ENERGY GRP NINGXIA COAL IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method has a high removal rate of ammonia nitrogen, the raw materials of diatomite, activated carbon and zeolite are relatively expensive, and the loaded magnesium ions are easy to enter the ammonia nitrogen wastewater when adsorbing ammonia nitrogen, which is easy to cause secondary pollution.

Method used

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  • Gasified slag-based composite ammonia nitrogen adsorbent, preparation method, regeneration method and application thereof, and method for treating ammonia nitrogen-containing wastewater
  • Gasified slag-based composite ammonia nitrogen adsorbent, preparation method, regeneration method and application thereof, and method for treating ammonia nitrogen-containing wastewater
  • Gasified slag-based composite ammonia nitrogen adsorbent, preparation method, regeneration method and application thereof, and method for treating ammonia nitrogen-containing wastewater

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specific Embodiment approach

[0056] According to a particularly preferred embodiment of the present invention, the method of the present invention comprises:

[0057] (1) Separating gasification slag from carbon ash to obtain carbon-rich slag, which is sequentially subjected to first drying, crushing and screening;

[0058] (2) In the presence of alkaline conditions and water, sodium hydroxide, sodium metaaluminate and the carbon-rich slag obtained by screening are mixed, and then the mixed material is subjected to a hydrothermal reaction;

[0059] (3) The hydrothermal reaction product is washed, solid-liquid separated, and secondly dried in sequence to obtain the vaporized slag-based composite ammonia-nitrogen adsorbent.

[0060] As mentioned above, the second aspect of the present invention provides the gasified slag-based composite ammonia-nitrogen adsorbent prepared by the aforementioned method.

[0061] As mentioned above, the third aspect of the present invention provides a method for regenerating ...

preparation example

[0086] The gasification slag is subjected to hydrocyclone gravity separation to obtain carbon-rich slag and high-ash slag, among which:

Embodiment 1

[0090] (1) The carbon-rich slag is first dried (the drying temperature is 100° C.), ground, and screened with a 200-mesh sieve to obtain a carbon-rich slag with a particle size of 63-76 microns;

[0091] (2) In the reactor, in the presence of distilled water, the carbon-rich slag, sodium hydroxide and sodium metaaluminate (total solid content of 400g / L) obtained in step (1) were stirred and mixed at room temperature for 3h, and then The mixed material is subjected to hydrothermal reaction, the hydrothermal reaction temperature is 160°C, the hydrothermal reaction time is 24h, and the pH value is 10.23; the molar ratio of the carbon-rich slag, sodium metaaluminate and sodium hydroxide is 3: 1:5.7, the amount of the carbon-rich slag is calculated by silica, the amount of sodium metaaluminate is calculated by aluminum oxide, and the amount of sodium hydroxide is calculated by sodium oxide;

[0092] (3) The hydrothermal reaction product is washed with excess distilled water, filter...

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Abstract

The invention relates to the field of ammonia nitrogen adsorbents, and discloses a gasified slag-based composite ammonia nitrogen adsorbent and a preparation method and a regeneration method thereof. The method comprises the steps that 1, gasified slag is subjected to charcoal-ash separation, carbon-rich slag is obtained, and in the carbon-rich slag, the carbon element content is larger than or equal to 15 wt%, and the silicon element content is larger than or equal to 40 wt%; and (2) under the alkaline condition and in the presence of water, the carbon-rich residues, a sodium source substance and an aluminum source substance are subjected to a hydrothermal reaction, and the aluminum source substance is selected from at least one of soluble metaaluminate and soluble aluminum salt. The gasified slag-based composite ammonia nitrogen adsorbent is prepared from the gasified slag, and the adsorbent has good ammonia nitrogen adsorption performance on middle and low concentration ammonia nitrogen, so that good economic benefits and environmental protection benefits are realized.

Description

technical field [0001] The invention relates to the field of ammonia nitrogen adsorbents, in particular to a gasification slag-based composite ammonia nitrogen adsorbent, a preparation method and a regeneration method thereof, and a method for application and treatment of ammonia nitrogen-containing wastewater. Background technique [0002] Gasification slag is the incomplete combustion of coal with oxygen or oxygen-enriched air to generate CO and H 2 In the process of coal chemical industry, the inorganic minerals in coal undergo different physical and chemical transformations, and the solid residue formed by carbon particles remaining in the coal is a carbon-ash composite solid waste produced in the modern coal chemical industry. Its reserves are huge, and its accumulation and landfill will occupy precious land resources and seriously damage the surrounding geological environment. Therefore, how to realize the resource utilization of gasification slag solid waste to solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28B01J20/30C02F101/16
CPCB01J20/20B01J20/0251B01J20/0248C02F1/281C02F2101/16
Inventor 金政伟马超齐志丽王建成井云环樊盼盼杨磊鲍卫仁苏万里董连平江尧王儒洋刘春萌范佳明刘洪刚
Owner CHINA ENERGY GRP NINGXIA COAL IND CO LTD
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