On the basis of study on physical and chemical properties of magnetic bead (MB) in fly ash (FA), the paper gives out the separation methods of MB and results of three separating process. The result of comparative test in size, density, stability, magnetic material content, specific magnetic susceptibility (SMS), medium recovery oxidation resistance and wear resistance between MB and magnetic fines currently used in dense medium separation leads to that using MB recovered from fly ash is used as medium solid:Is in coal cleaning in stead of magnetic fines not only have no influence upon taryests of separation, but can bring good economic and social benefits.
The stress state and floating-sinking reqularity of various particles in fly ash in water were analyzed. Theformula for calculating the floating-sinking rate was given. And the formula for calculating the magnetic forceneeded to separate magnetic beads from magnetic separator was also obtained.
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