Method for the production of superabsorbers

A process for producing superabsorbent particles by polymerizing a monomer solution or suspension comprising

• a) at least one ethylenically unsaturated monomer which bears an acid group and optionally is at least partly neutralized,
• b) at least one crosslinker,
• c) at least one initiator,
• d) optionally one or more ethylenically unsaturated monomer copolymerizable with the monomer mentioned under a) and
• e) optionally one or more water-soluble polymer,
• comprising
• i) classifying the superabsorbent particles by one or more sieves, and
• ii) removing metallic impurities by one or more magnetic separators,
• wherein step i) is conducted before step ii), which comprises classifying using sieves made of a wire mesh, wherein the wires of the wire mesh consist of a steel composed of at least 70% by weight of iron, at least 10% by weight of chromium, and less than 2.5% by weight of nickel, and throughput of superabsorbent particles in the magnetic separator is in the range from 2.0 to 6.5 g/s per cm2 of free cross-sectional area.