The invention relates to a spiral steel mill for comminuting and classifying regrind, with at least one process space, this at least one process space being enclosed by a housing, at least one regrind feed opening into the at least one process space, at least two grinding nozzles, a fine material outlet radially from one The classifier wheel is enclosed, with the process space being assigned at least one discharge nozzle. The invention further relates to grinding, separating and discharging difficult-to-grind components of a good mixture of components with different grindability from a spiral steel mill, the difficult-to-grind components having at least one additional discharge nozzle are removed from the process room.
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