Fly ash is a relatively inexpensive and widely used solid waste. Surface modification and refunctionalization of fly ash particles are one of the main means to increase its added value. Surface modification of fly ash particles, And then load some functional additives, a new type of functional material can be obtained. The method can greatly improve the added value of fly ash utilization, can greatly mobilize the enthusiasm of enterprises for the deep utilization of fly ash, and promote the deep utilization of fly ash.
fly ash surface modification technology
Modifying fly ash can obtain products with a larger specific surface area and better exert its adsorption performance.
Physical modification methods, such as ultrasonic, microwave treatment, mechanical grinding and high temperature treatment, can destroy the glass network structure of fly ash, increase the specific surface area, and change the electromagnetic properties of fly ash particles through coating.
Chemical modification methods, such as acid modification, alkali modification, fire modification, hydrothermal modification, mineral salt modification, calcium oxide treatment, etc. can also destroy the silicate network structure, promote the dissolution of the glass surface, and increase the specific surface area. And ion exchange capacity.
The “chemical modification method” also includes modification using surfactants, such as coupling agent treatment, stearic acid treatment, cationic surfactant treatment, and the like.
Coupling agent treatment can improve the dispersibility of inorganic pigments and the surface adhesion to glass, metals, etc.; stearic acid treatment can achieve the purpose of hydrophobic modification, so that fly ash can be used as a filler for polymers; Cationic surfactants can change the surface electrical properties of fly ash particles and increase the surface adsorption capacity. They are mainly used for various types of wastewater treatment.
fly ash surface functional design
The functional design of the surface of fly ash particles is generally through the design of groups on the interface and loading the corresponding functional groups to obtain fly ash-based functional materials.
1. formaldehyde capture material
The modified fly ash loaded with formaldehyde trapping agent can combine the two effects of physical adsorption and chemical neutralization, there is no desorption problem, and formaldehyde can be continuously eliminated all day long. The formaldehyde trapping agent loaded on fly ash can avoid polluting the room environment, is convenient to use, and has very high added value, good economic and social benefits.
2. fly ash-based hydrophobic film material
Hydrophobic film can be used for mold prevention, building exterior walls, packaging materials, etc. Hydrophobic modification of the surface of coal fly ash with cationic dispersion rosin glue can produce a hydrophobic fiber material. It can be treated with stearic acid and the relationship between the pigment volume concentration and the critical pigment volume concentration in the organic/inorganic composite material can be used. Adjust the hydrophobic properties of the film. The hydrophobic film material prepared by using fly ash has low cost and good practicability.
3. fly ash-based composite humidity control material
After hydrophilic modification of fly ash, the compounding of hydrophilic polymer and salt can produce a composite humidity control material, which can be regenerated to prepare powders and coatings. It has passive, intelligent humidity control and low cost. And the advantages of energy saving and environmental protection. This composite humidity control material can automatically adjust the indoor air humidity when used in interior wall coatings, exhibits excellent moisture absorption and release functions, and is suitable for occasions where humidity control is required such as family rooms and libraries.
The surface functional modification of fly ash has a very strong pertinence, which can turn solid waste fly ash into functional materials. Only by using fly ash reasonably, fully and deeply, can fly ash truly become an industrial raw material with low price and excellent performance.
CLIRIK HGM micro powder grinding mill, with 4 powder collection bins, according to requirements, complete the collection of finished products of different fineness and properties. Including the collection of modified powder, through the powder modifying machine, the powder is covered with special materials, the physical and chemical properties of the powder are improved, and the value is increased.
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