Rubidium purification solution suffers the problems of low concentration and high ammonia content.A three-stage electrodialysis concentration process is used to concentrate the low concentration ammonia-containing rubidium purification solution obtained by adsorption method.The influences of different current densities and feed flow rates on the time,energy consumption,relative concentration rate and rubidium recovery of the concentration experiments are evaluated.It is verified that the Rb+concentration is concentrated from 26.6 mg·L-1 to 1 976.2 mg·L-1 after experiencing three-stage concentration at a current density of 20 mA·cm-1 and a flow rate of 130 mL·min-1.In addition,ammonia can effectively be removed from this purification solution by using an electrolytic de-ammonia process during the concentration process.
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