Experimental Study On Physicochemical Properties Of Biomass Power Plant Ash And Pozzolan Activity

China has been producing more than 600 million ounces of grain for many years,resulting in an annual production of agricultural waste.China’s huge annual agricultural waste resources due to agricultural production have had a huge negative impact on environmental protection,air management,and agricultural reproduction.The Chinese government is adopting a number of policies to try to solve these problems.Among them,accelerating the construction of biomass-fired direct-fired power plants is an important policy component.Biomass direct-fired power plants can solve or partially solve the problem of idle agricultural biomass resources,and can also alleviate the disorderly burning of biomass waste resources.However,as biomass power plants are gradually put into use,the waste biomass power plant ash generated in the production process needs to be solved.The biomass ash produced by the power plant combustion contains a large amount of active silica and has certain pozzolanic activity.It is generally believed that biomass ash can be used as a new building material admixture.While solving the waste ash of power plants,it can reduce the non-renewable resources and huge environmental costs required for the production of cement clinker,and also realize the waste of biomass ash and waste,reuse of waste resources,and meet the comprehensive utilization of resources in social life.It can also realize the waste of biomass ash and waste,and the reuse of waste resources meets the requirements of comprehensive utilization of resources in social life.This project uses the biomass ash produced by the water-cooled vibrating grate biomass of Heilongjiang Province,Guokeng Wangkui Power Plant,to explore the physical and chemical properties and volcanic ash activity of the biomass ash produced by the power plant,and the biomass ash after activation by different activation modes.The physical and chemical properties and volcanic ash activity,looking for a cost-effective way to prepare biomass volcanic ash materials,and then explore the biomass gray hydration reaction and related mechanisms.Realize the comprehensive utilization of biomass power plant ash,enhance its added value,and maximize the use of resources.The unactivated biomass ash has a higher total organic carbon content(TOC),higher ash content and residual carbon content,uneven particle gradation,larger particles,and smaller specific surface area.Therefore,the unactivated biomass ash has poor pozzolanic activity and does not have ideal physical and chemical properties.However,since it has a good pH value and electrical conductivity,it can be used as a raw material for the soil conditioner of the A type.Mechanical grinding can effectively improve the physical properties of biomass ash,and temperature activation can comprehensively improve the physical and chemical properties of biomass ash.Thereby,the activated biomass ash has better pozzolanic activity and is ideal for physical and chemical properties.The test found that the temperature was 400℃,the heating time was 1 h,and mechanical grinding for 6 minutes was the most effective activation method in this test.At this time,the activated biomass ash(TBA-400℃)produced has the highest pozzolanic activity and desirable physical and chemical properties.The study also found that the activated biomass ash does not substantially participate in the gel reaction in the initial stage of cement hydration,nor does it exhibit pozzolanic activity.After 7 days of curing,the biomass ash gradually participates in the pozzolanic reaction,generating a large amount of gel material and rapidly increasing the strength of the test piece.The curing time is proportional to the rate of biomass pozzolanic reaction throughout the test period.When biomass ash is 7 ≤ 28 days,there are more active materials participating in pozzolanic reaction,and the reaction rate of pozzolanic ash is faster.This stage is the main pozzolanic reaction stage in mortar test.Due to the consumption of a large number of fine active particles in biomass ash,it may be one of the reasons why the filling and self-compactness of biomass ash sample group is not as good as that of pure cement control group.