The separation of Ca

2+

and Mg

2+

ions from phosphoric acid-nitric acid aqueous solution is very significant for the neutralization process of nitrophosphate fertilizer. This paper studied the adsorption equilibrium

kinetics

and dynamic separation of Ca

2+

and Mg

2+

ions by strong acid cation resin

and the effects of phosphoric acid and nitric acid on the adsorption process were investigated. The results reveal that the adsorption process of Ca

2+

and Mg

2+

ions in pure water on resin is in good agreement with the Langmuir isotherm model and their maximal adsorption capacities are 1.86 mmol·g

-1

and 1.83 mmol·g

-1

respectively. The adsorption kinetics of Ca

2+

and Mg

2+

ions on resin fits better with the pseudo-first-order model

and the adsorption equilibrium in pure water is reached within 10 min contact time

while at the present of phosphoric acid

the adsorption rate of Ca

2+

and Mg

2+

ions on resin will go down. The dynamic separation experiments demonstrate that the designed column a

dsorption is able to undertake the separation of metal ions from the mix acids aqueous solution

but the dynamic operation should control the flow rate of mix acid solution. Besides nitric acid solution was proved to be effective to completely regenerate the spent resin and achieve the recyclable operation of separation process.