Method for preparing metal chelating agent from glass fiber waste by modification and application of metal chelating agent

The invention relates to a method for preparing metal chelating agent from glass fiber waste by modification. The method comprises the following steps: a) washing and filtering solid glass fiber wastepowder, adding filter cakes to an alkali solution for boiling, performing filtering and washing with water to neutrality, performing filtering, adding the filter cakes to an acid solution for boiling, performing filtering and washing with water to neutrality, and performing filtering and drying to obtain pre-treated bromo-glass fiber powder; b) adding the pretreated bromo-glass fiber powder to afirst solvent, adding an amination modifier, performing stirring and reflux condensing, performing washing with water and ethanol in sequence after reaction, and performing filtering and drying to obtain a modified aminated material; c) adding the modified aminated material to a second solvent, adding a chelating group modifier, adding an initiator, performing heating, stirring, reflux condensing,reacting, suction filtering and washing, and drying a product to constant weight to obtain a metal ion chelated material.