Method of selectively removing adsorbed calcium and magnesium from cation exchange resins
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United States of America Patent
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Dec 14, 1982
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N/A
app pub date -
Jun 22, 1981
filing date -
Jun 22, 1981
priority date (Note) -
Expired
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Abstract
Adsorbed calcium is selectively removed from cation exchange resins in the presence of adsorbed magnesium by eluting the resin with aqueous sulfuric acid saturated with CaSO.sub.4 and undersaturated with MgSO.sub.4 to obtain a solution supersaturated with CaSO.sub.4 from which the CaSO.sub.4 can be readily precipitated. The magnesium is subsequently removed from the resin by eluting with aqueous sulfuric acid, such as 20-70% H.sub.2 SO.sub.4. The method is advantageously used in the regeneration of cation exchange resins, such as the loaded resins used for treatment of phosphate rock-derived phosphoric acid.
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