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Method for modifying fly ash

A fly ash and modification technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of low adsorption capacity, loss of adsorption performance, etc., to improve specific surface area and prolong service life. longevity, good effect

Active Publication Date: 2010-05-05
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fly ash has broad application prospects in wastewater treatment, but due to its low adsorption capacity, whether it can improve the adsorption capacity of fly ash and effectively solve the problem of adsorption materials losing adsorption performance due to biofouling is an important issue for the industry. The key to mass adoption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] ① The raw material is taken from a power plant fly ash, mix 20g fly ash with 60ml modifier solution evenly, control the ultrasonic sound intensity to 0.1W / cm 2 , temperature 30 ℃, reaction 3h, filter and dry partially modified fly ash;

[0021] ② Mix partly modified fly ash with 6.3ml of γ-glycidyl etheroxypropyl trimethoxysilane and 92.7ml of solvent xylene, and control the ultrasonic sound intensity to 0.5W / cm 2 , temperature of 100°C, and reaction for 6 hours, the obtained fly ash product was suction filtered, washed and dried;

[0022] ①The product obtained in the previous step is mixed with polyetherimide with DMF as the solvent, controlled at 80°C, and the ultrasonic sound intensity is 0.5W / cm 2 , and react for 5 hours to obtain modified fly ash grafted with polyquaternium salt on the surface, and then wash, filter, and dry to remove surface residues to obtain modified fly ash.

Embodiment 2

[0024] ① The raw material is taken from a power plant fly ash. Mix 15g of fly ash with a particle size of 20 mesh and 45ml of modifier solution evenly, and control the ultrasonic sound intensity to 0.15W / cm 2 , Partially modified fly ash filtered and dried at a temperature of 25°C and reacted for 2 hours;

[0025] ②Mix part of the modified fly ash with 8ml of γ-aminopropyltriethoxysilane and 92ml of solvent xylene, and control the ultrasonic sound intensity to 0.5W / cm 2 , temperature of 80°C, and reaction for 8 hours, the obtained fly ash product was suction filtered, washed and dried;

[0026] ③The product obtained in the previous step is mixed with polyetherimide with DMF as the solvent, controlled at 80°C, and the ultrasonic sound intensity is 0.5W / cm 2 , and react for 5 hours to obtain modified fly ash grafted with polyquaternium salt on the surface, and then wash, filter, and dry to remove surface residues to obtain modified fly ash.

Embodiment 3

[0028] ① The raw material is taken from a power plant fly ash. Mix 20g of fly ash with a particle size of 20 mesh and 60ml of modifier solution evenly, and control the ultrasonic sound intensity to 0.15W / cm 2 , temperature 20 ℃, reaction 2h, filter and dry partially modified fly ash;

[0029] ②Mix part of the modified fly ash with 8ml of γ-aminopropyltriethoxysilane and 92ml of solvent xylene, and control the ultrasonic sound intensity to 0.6W / cm 2 , temperature of 85°C, and reaction for 6 hours, the obtained fly ash product was suction filtered, washed and dried;

[0030] ③The product obtained in the previous step is mixed with polyetherimide with isobutanol as the solvent, controlled at 85°C, and the ultrasonic sound intensity is 0.5W / cm 2 , and react for 5 hours to obtain modified fly ash grafted with polyquaternium salt on the surface, and then wash, filter, and dry to remove surface residues to obtain modified fly ash.

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Abstract

The invention relates to a method for carrying out surface modification on waste fly ash and leading the waste fly ash to become an absorbing material with high absorption capacity and sterilization performance, and the method comprises the following steps: mixing the fly ash of 20 meshes with solution of an inorganic acid modifier (mixed solution that HCl: H2SO4 is equal to 1:3) according to the solution-ash ratio of 3: 1, and obtaining the partially modified fly ash under the ultrasonic action; and using a silane coupling agent for processing the surface of the fly ash, and further utilizing the reaction activity of the silane coupling agent for carrying out the further graft reaction, thereby preparing the absorbing material with immobilized polyquaternary ammonium salt sterilization performance and higher absorption capacity.

Description

technical field [0001] The invention relates to powder body modification technology, which is a modification method of fly ash, which is a method for grafting high molecular biocidal groups on the surface of waste fly ash and improving its adsorption performance. Background technique [0002] Fly ash is a kind of industrial waste, and the accumulated amount of piled up over the years in my country has reached more than 1 billion tons. Currently, the utilization rate of fly ash is only 41.7%. ecological balance. Through in-depth research on the physical and chemical properties of fly ash, its particle shape and surface structure are similar to activated carbon, and it has a large specific surface area. Adsorption capacity. Fly ash has broad application prospects in wastewater treatment, but due to its low adsorption capacity, whether it can improve the adsorption capacity of fly ash and effectively solve the problem of adsorption materials losing adsorption performance due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/02B01J20/30C02F1/28
Inventor 顾锡慧滕厚开刘红光陈军李立峰郝杨杨子立
Owner CHINA NAT OFFSHORE OIL CORP
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