The exist of MgCl2 is an important factor for flotation efficiency reducing in KCl flotation process using carnallite as the raw material.The effect of MgCl2 concentration on the viscosity

dispersion of ODA-HCl and KCl recovery efficiency were studied

and the best aeration ratio and solid-fluid ratio in the MgCl2 flotation system of concentration 20% were investigated.The results indicate that the viscosity of the flotation system increases with the increase of MgCl2 concentration.Thus

the dispersion of ODA-HCl get worse and the effective concentration of ODA-HCl decreases.The flotation recovery efficiency of KCl reduces by 13.49% when MgCl2 concentration increases from 0 to 20%.The recovery of KCl increases by 10.3%

as the aeration ratio and solid-fluid ratio are adapted to 200 mL/min and 3∶100.So

the bad effect of MgCl2 concentration on the dispersion of ODA-HCl decreases and KCl flotation efficiency increases by regulating the flotation aeration ratio and solid-fluid ratio.