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  • Japanese Patent No. 60118288, a patent assigned to NEC Corporation discloses a process for the removal of iron and calcium and other metal ions such as nickel, zinc, copper, cadmium, lead, cobalt, and the like using a complexing agent such as amino carboxylic acid, nitrilotriacetic acid, hydroxycarboxylic acid, citric acid, tartaric acid, etc.) The metal complex is insoluble and is precipitated fr
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