Analysis on the influence factors to fluorine transfer in red mud

In order to study the influence factors to fluorine transference in red mud，the paper designs seven groups of dynamic leaching experiments on the basis of hydrogeologic conditions around the piled field of the red mud, and carries on grey relationship analysis on the tentative data. The results prove that the temperature is 78℃ from the surface under 700 mm position of the red mud that discharged after seven days and the temperature is 87.5℃ of the ash water that is discharging just now; high temperature is of advantage to fluorine transfer; the pH value of the red mud is 10.29 to 11.83 and the pH value of the leaching solution is 12.00 to 13.20; high alkalinity is propitious to fluorine transfer; the other components of the red mud is as follows: total hardness, Cl-, SO42-, K+, Na+, Ca2+, Mg2+ are all influence factor to fluorine transfer, and Na+, SO42- and Ca2+ are the primary control factors.