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The invention relates to functional steel slag powder. The raw materials comprise less than 2% by weight of metallic iron, less than 1.5% by weight of water and steel slags with the particle size less than 8 mm, a closed-circuit grinding technology through a tube mill is adopted, and after the steel slags are measured, the steel slags are fed into the tube mill to conduct powder grinding; the ground materials are fed into a powder selecting machine to conduct particle size classification, the specific surface area is 420 m<2>/kg, a 45-micron square hole screen screens out less than 5% of fine powder which is the functional steel slag powder, the 45-micron square hole screen screens out more than 5% of coarse powder, fine iron separation is conducted on the coarse powder through a dry-type magnetic separator, it is guaranteed that the functional steel slag powder metallic iron is less than 0.1%, and the coarse powder which is subjected to the fine iron separation is added to an additive which accounts for 0.5%-5% of unit-hour output of the tube mill before returning to the tube mill and sent to the tube mill to conduct closed-circuit grinding. The performance of concrete can be improved, the production cost is reduced, the damage of a mountainous pile of the steel slags on the ecological environment is reduced, the waste is turned into wealth, and the valuable land sources are saved.
The invention relates to functional steel slag powder. The raw materials comprise less than 2% by weight of metallic iron, less than 1.5% by weight of water and steel slags with the particle size less than 8 mm, a closed-circuit grinding technology through a tube mill is adopted, and after the steel slags are measured, the steel slags are fed into the tube mill to conduct powder grinding; the ground materials are fed into a powder selecting machine to conduct particle size classification, the specific surface area is 420 m<2>/kg, a 45-micron square hole screen screens out less than 5% of fine powder which is the functional steel slag powder, the 45-micron square hole screen screens out more than 5% of coarse powder, fine iron separation is conducted on the coarse powder through a dry-type magnetic separator, it is guaranteed that the functional steel slag powder metallic iron is less than 0.1%, and the coarse powder which is subjected to the fine iron separation is added to an additive which accounts for 0.5%-5% of unit-hour output of the tube mill before returning to the tube mill and sent to the tube mill to conduct closed-circuit grinding. The performance of concrete can be improved, the production cost is reduced, the damage of a mountainous pile of the steel slags on the ecological environment is reduced, the waste is turned into wealth, and the valuable land sources are saved.
Functional steel slag powder
GUO XINLING (author)
2015-12-09
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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