Processes are needed to rapidly and cost-effectively produce highly pure lithium salts for the rechargeable battery sector. Lithium purification is an engineering challenge, due to the low concentrations of lithium compared to sodium, potassium, magnesium, calcium, and transition metal ions commonly occurring in lithium brine resources. We report a SPE process that rejects sodium and potassium, while binding lithium and other ions. Lithium is then harvested by selective elution from the SPE column. The rapid equilibration kinetics of the various ions with the SPE matrix enables these separations to occur in minutes in one column stage with compact units. The ion capture and displacement kinetics will be shown. The resultant engineering parameters and projected capital/operating costs are modeled and described.