Research On The Effects Of Leaching Characteristics Of The Trace Metal Elements Of Fly Ashes From Coal Combustion In Different Leaching Methods

Coal plays an importment role tin the economy development of our country. Coal power generation is approximately 70%. Utilizing coal combustion can provide power and at the same time generates a lot of fly ash, which causes serious natural environmental problem. Fly ash not only pollutes the air but also takes most land, and do deadly pollution to water and earth. The deposit of fly ash in a long turn can be flushed by rain, which results in the leaching of trace elements in it. Besides, the trace elements become rich gradually in the function of food chains,enventually can be in the human body to do damages.First,the thesis collects sample in the station according to the practice,depicts the formation mechanisms and the species of fly ash,the quantity and the hazards of the heavy matels,the characteristic and the species ofleaching,the development of domestic and overseas,and so on. Second combining the condition of the locale,collect the fly ash and the other informations.Then carry out the batch leaching and column leaching to the fly ash,and use the ICP-AES to test the leaching liquor of the experiment.Finally, according to the date of different sizes,different time,different leaching methods,to analyze and discuss the leachability and the concentration of leachate of the heavy matels in the fly ash,and to compare Cr,Cd,Pb,Co,Ni,Zn to open out the leaching disciplinarian of the heavy matels.All of these is to establish foundation to the next investigation,and offer theoretic foundation to solve the pollution of fly ash.