Superfine slag powder prepared from blast furnace ferronickel slag, as well as preparation system and method thereof

The invention belongs to the technical field of constructions, and particularly relates to superfine slag powder prepared from blast furnace ferronickel slag, as well as a preparation system and method thereof. The superfine slag powder is prepared from the following raw materials in parts by mass: 90-95 parts of blast furnace ferronickel slag and 5-10 parts of industrial slag. According to the superfine slag powder, the blast furnace ferronickel slag and the industrial slag are reasonably selected and proportioned by optimized mode and parameter, and the quality of the prepared slag powder can reach the S105 grade specified in national standard GB/T18046-2008, has small fineness, large specific surface area and high activity, and is well accepted by users; and the S105 grade superfine slag powder prepared by doping blast furnace ferronickel slag into other industrial slags is used in concrete and has the advantages of improving concrete performance, concrete strength and concrete strength growth period, prol