Abstract: The absorption effect and absorption behavior of tailings of magnetic separation of converter sludge as test samples on copper ion were investigated.The results show that removal rate of Cu2+ can reach 97.86%, companying with the suitable conditions, that is, the tailings of magnetic separation of converter sludge of 8.0 g/L in dosage, concentration of Cu²⁺ of 20 mg/L and the reaction time 50 min.The importance of adsorption factors are shown as follows：the dosage of tailings > initial concentration of copper ion solution> reaction time.The adsorption reaction mainly consists of the surface  dsorption with somewhat replacement reaction accompanied.