TANG Mingxiu;SONG Huiping;XUE Fangbin;

• 1:State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources
• 2:Institute of Resources and Environment Engineering
• 3:Shanxi University

Abstract：

Fly ash is a kind of waste residue produced by coal-fired power plant. If it is not treated for a long time,it will harm human body and natural environment. Because of its own structure,pozzolanic effect and filling effect,fly ash can be used as secondary resource again. As a big fly ash emission country,China has been actively looking for more effective ways to use fly ash to improve the utilization rate of fly ash. In recent years,with the development of the coating industry,the demand for fillers is gradually increasing,and appropriate filler substitutes are needed at home and abroad to reduce the cost of coatings. Many scholars have used fly ash as raw material in the coating industry. According to the properties of fly ash,various functional coatings have been made and found to have good performance and economic effect. In this paper,the production of fly ash and its environmental problems,the basic characteristics of fly ash was introduced,and the coatings according to their functions were classified. The main principle,technology and product performance evaluation of various coatings were mainly described. The research progress of fly ash in coating industry at home and abroad was summarized. The main problems existing in the application of fly ash in coating industry were summarized. The results show that the low thermal conductivity of fly ash conforms to the heat barrier mechanism,and it can be combined with other thermal insulation materials to form a thermal insulation coating with multiple heat insulation mechanisms such as reflecting heat and blocking heat,which can be applied on the wall surface to improve the heat insulation effect. The physical and chemical properties of fly ash are stable and high temperature resistant,and its fire resistance can make fly ash act as smoke suppressor and flame retardant in flame retardant coatings,which is suitable for fire protection treatment of steel structure,wood surface and tunnel inner wall; fly ash has cementation effect,which can enhance the density of materials by interaction with other materials,and introduce electrochemical mechanism to improve the corrosion resistance,which can be used to reduce the corrosion degree of cement,metal and other surfaces; through the activation and modification of fly ash and the combination with crystalline materials,a more compact structure is formed,which has excellent resistance to penetration and waterproofing. Fly ash mixed with suspending agent,dispersant and binder can be used as a casting coating to protect castings on casting surface,so as to improve molding effect and facilitate demoulding. Polymer emulsion,cement and modifier are added to increase the bonding strength of coal ash and coal seam,thus opening up the ability of plugging coating as underground mine,and the compact coating effectively prevent the leakage of dangerous gas underground. Using fly ash as raw material,different types of functional coatings prepared by various processes,which the economic cost of raw materials is reduced and the waste resources are reused. Although fly ash has made more progress in the coating industry,there are still some problems due to technical limitations. The color,residual carbon and utilization rate of fly ash as coating filler are still the focus of the next research.

Key Words： fly ash;coating;resource utilization;functionalization;process flow

Abstract:

Keywords:

Foundation: 国家自然科学基金资助项目(51874194);; 山西省应用基础研究计划面上青年基金资助项目(201801D221327);; 2020年山西省研究生教育创新项目(202008)

Authors: TANG Mingxiu;SONG Huiping;XUE Fangbin;

DOI: 10.13226/j.issn.1006-6772.EP20063002

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