The adsorption of alkylmorpholine (DMP）on NaCl and KCl crystals was studied with the density functional theory (GGA-PW91）using computer simulation

where NaCl (100）with F color center and KCl (100）with O-2 defect.The charges of ions on NaCl(100）are changed to positive by F color center

while the charges of ions on KCl (100）are changed to negative by O-2.The adsorption energy of DMP on Na-top is -157.00 kJ·mol-1 and that on KCl (100）with O-2 is -59.14 kJ·mol-1.Therefore

DMP can be adsorbed on both NaCl and KCl

and the interaction between NaCl and DMP is stronger.The flotation experiments on the overflow potash ore containing alkylmorpholine indicate that the flotation recovery for NaCl is high

while the recovery of KCl is low.This result reflects different adsorption characteristics of DMP on surfaces of NaCl and KCl

which corroborates the result of computer simulation.