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Preparation method and application of fly ash-based defluorination adsorbent

A fly ash and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of low load strength and high cost of adsorbent preparation, and achieve good regeneration performance , significant economic and environmental benefits, and improved adsorption effect

Active Publication Date: 2021-05-25
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

These supports have well-developed pores, but the lack of binding sites for zirconium leads to low loading strength, so a complicated loading process is often required, which makes the cost of adsorbent preparation high.

Method used

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  • Preparation method and application of fly ash-based defluorination adsorbent
  • Preparation method and application of fly ash-based defluorination adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0024] 1) Alkali modification of fly ash: first mix fly ash and calcium hydroxide with a particle size of 230-270 mesh at a mass ratio of 3:1, then add deionized water at a solid-to-liquid ratio of 1:15, and place at 90°C Heating and stirring in a constant temperature water bath for 360 minutes, after the reaction is completed, rinse the residual calcium hydroxide on the surface of the fly ash with deionization, filter and dry to obtain the alkali-modified fly ash.

[0025] 2) Fly ash load modification: according to zirconium ion (Zr 4+ ) and alkali-modified fly ash with a mass ratio of 1:15 to prepare a zirconium oxychloride solution, slowly add the fly ash into the zirconium oxychloride solution and slowly add ammonia water dropwise to keep the pH range of the solution at 8 to 9, and then set In a constant temperature water bath oscillator, shake for 120min at an oscillation frequency of 100r / min and a temperature of 20-30°C. After the oscillation is completed, filter and dr...

Embodiment 2

[0028] 1) Alkali modification of fly ash: first mix fly ash with a particle size of 230-270 mesh and calcium hydroxide at a mass ratio of 5:1, then add deionized water at a solid-to-liquid ratio of 1:15, and place at 90°C Heating and stirring in a constant temperature water bath for 360 minutes, after the reaction is completed, rinse the residual calcium hydroxide on the surface of the fly ash with deionization, filter and dry to obtain the alkali-modified fly ash.

[0029] 2) Fly ash load modification: according to zirconium ion (Zr 4+ ) and alkali-modified fly ash with a mass ratio of 1:15 to prepare a zirconium oxychloride solution, slowly add the fly ash into the zirconium oxychloride solution and slowly add ammonia water dropwise to keep the pH range of the solution at 8 to 9, and then set In a constant temperature water bath oscillator, shake for 120min at an oscillation frequency of 100r / min and a temperature of 20-30°C. After the oscillation is completed, filter and dr...

Embodiment 3

[0032] 1) Alkali modification of fly ash: first mix fly ash and calcium hydroxide with a particle size of 230-270 mesh at a mass ratio of 7:1, then add deionized water at a solid-to-liquid ratio of 1:15, and place at 90°C Heating and stirring in a constant temperature water bath for 360 minutes, after the reaction is completed, rinse the residual calcium hydroxide on the surface of the fly ash with deionization, filter and dry to obtain the alkali-modified fly ash.

[0033] 2) Fly ash load modification: according to zirconium ion (Zr 4+ ) and alkali-modified fly ash with a mass ratio of 1:15 to prepare a zirconium oxychloride solution, slowly add the fly ash into the zirconium oxychloride solution and slowly add ammonia water dropwise to keep the pH range of the solution at 8 to 9, and then set In a constant temperature water bath oscillator, shake for 120min at an oscillation frequency of 100r / min and a temperature of 20-30°C. After the oscillation is completed, filter and dr...

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Abstract

The invention discloses a preparation method and application of a fly ash based defluorination adsorbent. The method includes sieving fly ash, then mixing calcium hydroxide and the screened fly ash according to a certain proportion, adding deionized water according to a certain solid-to-liquid ratio after mixing, heating and stirring the mixture for a period of time, washing to remove residual calcium hydroxide after the reaction is completed, and filtering and drying to obtain alkali modified fly ash; and preparing a zirconium oxychloride solution, slowly pouring the alkali-modified fly ash into the zirconium oxychloride solution, slowly dropwise adding ammonia water at the same time to keep the pH value of the solution at 8-9, then placing the solution in a constant-temperature water bath for oscillation, and after oscillation is finished, filtering, drying and roasting to obtain the zirconium-loaded fly ash. The zirconium-loaded fly ash is prepared by taking the solid waste fly ash of a thermal power plant as a raw material in a mode of combining hot alkali modification and load modification, has relatively strong selectivity and adsorption effect on fluorine ions in the coal chemical industry wastewater, and is good in regeneration performance; waste is treated with waste so that economic and environment-friendly benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and relates to the treatment of high-fluorine wastewater in coal chemical industry, in particular to a preparation method and application of a fly ash-based fluoride removal adsorbent. Background technique [0002] Coal chemical industries such as coal coking, gasification, and liquefaction will produce a large amount of fluorine-containing wastewater. If this part of fluorine-containing wastewater is reused in the production system, it will cause serious corrosion of pipelines and equipment; The environment has caused serious fluorine pollution, which eventually endangers human health. The traditional chemical precipitation method can only reduce the concentration of fluoride to about 15mg / L, and the national standard limit is 10mg / L. With the tightening of environmental protection policies and the improvement of sewage standards, coal chemical enterprises urgently need to adopt more...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/28B01J20/30C02F1/28C02F101/14
CPCB01J20/06B01J20/103B01J20/16B01J20/28054C02F1/281C02F2101/14
Inventor 孙浩何鑫厉伟张家豪李小兵
Owner CHINA UNIV OF MINING & TECH
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