CHAI Chunjing;SONG Huiping;FENG Zhengjun;ZHANG Jincai;CHENG Fangqin;

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

Abstract：

Fly ash is the fine ash collected from the flue gas after coal combustion,which is the main solid waste discharged from coal-fired power plants,and has great harm to the environment and human health. The preparation of ceramsite by using fly ash is one of the important ways to recycle fly ash. Because of its excellent properties such as small density,light weight,heat preservation,heat insulation,good fire resistance,good anti-seismic performance,low water absorption,good anti-freezing performance and good durability,the fly ash ceramsite has wide application prospects in the fields of waste water treatment,waste gas treatment,noise control and building materials,etc. In this review,the latest development of fly ash ceramisite in recent years was reviewed and the feasibility of preparing fly ash ceramsite by roasting process and unburned process was analyzed. The related research results of fly ash ceramisite were introduced. The mechanism,raw materials,technological conditions and product properties of producing roasting ceramsite and unburned ceramsite by using fly ash were emphatically introduced. At the same time,the main problems and solutions in the comprehensive utilization of fly ash in China were put forward and the future development trend was forecasted,so as to provide reference for the research on the mechanism and technology of preparing ceramsite with fly ash. The results show that the preparation process of fly ash roasted ceramsite mainly includes batching,mixing,granulation,drying,pre-firing,roasting,cooling and screening. The main factors that affect the properties of the roasted ceramsite are raw material ratio,preheating time,preheating temperature,heating rate,calcination time,calcination temperature,etc. The preparation process of fly ash unburned ceramsite mainly includes batching,mixing,granulation,aging,drying,curing and cooling.The main factors that affect the properties of the unburned ceramsite are the properties of raw materials,the amount of activator,the amount of binder,the type and amount of foaming agent,curing method,steam curing temperature and curing time. The products with different properties and uses can be prepared by changing the process conditions. At present,fly ash ceramsite is mainly roasted ceramsite. Roasted ceramsite has the advantages of mature technology and high product strength,but it has the disadvantages of high energy consumption,large investment and complex process. Therefore,the development of fly ash unburned ceramsite has become a new trend. The unfired ceramsite is still in the development stage,and the products have the disadvantages of low strength and small specific surface area. It overcomes the disadvantages of high cost and pollution in the preparation of ceramsite by roasting method,and can be used in the situation where the requirements of cylinder compression strength is low and bulk density is high in the future. In order to improve the performance of ceramsite and reduce the cost,the selection of additives,technology and environmental safety of porous unburned ceramsite can be studied in depth. The preparation of ceramsite with fly ash not only solves the pollution problem of fly ash,but also solves the source of ceramsite raw materials,which has important practical significance.

Key Words： fly ash;roasted ceramsite;unburned ceramsite

Abstract:

Keywords:

Foundation: 山西省揭榜招标项目(20191101007);; 山西省重点研发计划资助项目(201903D421002);; 襄垣县固废综合利用科技攻关项目(2018XYSDYY-11)

Authors: CHAI Chunjing;SONG Huiping;FENG Zhengjun;ZHANG Jincai;CHENG Fangqin;

DOI: 10.13226/j.issn.1006-6772.EP20090201

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