Effects of Magnetic Treatment on Leaching Releasing of Heavy Metals Element in Fly Ash from CFB

The effect of the intensity of magnetic field on the chemical activity and characteristics of heavy metals Pb and Cr in power plant fly ash from circulating fluidized bed boiler (CFBFA) was studied through the project of Tessier´s successive chemical extraction and successive leaching, according to the general regulation of the influence of magnetic treatment on water and minerals.The results show that the intensity of magnetic field has a distinct impact on the releasing amount of heavy metals in power fly ash. With the same leaching medium, the amount of releasing under the magnetic field with the intensity of 0.1 T is more than that with the intensity of 0 T and 0.25 T. Meanwhile, the property and chemical activity of released heavy metals Pb and Cr are studied with the different pH value of leaching medium. The analysis of particles size distribution of power fly ash shows that the particles with smaller size are the majority of total particles, so the trace elements tend to enriching in smaller particles of power fly ash. The degree of enrichment of trace element is closely related to the average particle size of CFBFA.