Аннотация:Ion exchange is applied for demineralization of solution with salts concentration up to 10 g/l. Significant increase of level of mineralization of initial solutions above the traditionally considered maximal level 1-2 g/l is the result of improvements of ion exchange technology:
• diminished quantities of ion exchange resins, reagents for regeneration and rinse waters are consumed;
• concentrations of reagents for regeneration of resins are significantly increased;
• stoichiometric quantities of reagents to regenerate resins are applied;
• concentrated solutions of salts displaced from the spent resins without exceeds of regeneration reagents are obtained.
These improvement are achieved by new techniques and procedures introduced in the technology:
• Definite combination of cation exchange and anion exchange resins of strong and weak acid-base types are used;
• Proprietary counter-current apparatus are used for all operations of sorption, regeneration and rinsing of resins;
• Proprietary concentrations of regeneration agents and some other conditions of regeneration to diminish significantly the selectivity of resins are applied;
• Proprietary conditions of rinsing of spent resins to substitute the regeneration reagent without dilution are applied.