Steel slag grinding process

The invention discloses a steel slag grinding process, and belongs to the technical field of steel slag utilization. The steel slag grinding process comprises the following steps: firstly, extruding steel slag by using a roller press, crushing the steel slag and exposing iron particles in the steel slag; removing iron from the crushed steel slag through an iron remover, then feeding the steel slag into a combined powder concentrator for screening, returning the steel slag with the specific surface area not meeting the requirement to the roller press for continuous extrusion after screening, and warehousing the steel slag powder with the specific surface area meeting the requirement through a dust collector to serve as a semi-finished product; and mixing the semi-finished product with slag, feeding into a vertical mill for final grinding, and selecting powder with the specific surface area meeting the requirement as a finished product to be warehoused through a powder concentrator of the vertical mill. The new