Abstract
Because of the high hardness and poor wear resistance of steel slag, the potential cementing property of steel slag can not be effectively exerted, and the utilization rate of steel slag. Is low. In order to improve the performance and grinding efficiency of steel slag powder, different grinding aids were added in the process of steel slag grinding in laboratory and production line respectively. The effects of different grinding aids on the performance and technological parameters of steel slag powder were studied. The results show that the specific surface area of steel slag powder is higer or lower, the fluidity and the activity index increased, the energy consumption of ball mill is reduced, the energy consumption of elevator and separator increased. The following conclusions can be drawn: (1) Steel slag properties: different grinding aids have no obvious effect on the grinding fineness of steel slag powder, but can effectively improve the activity index of steel slag powder. (2) Technological parameters: different dosage of grinding aids can reduce the power consumption of ball mill and improve the energy power consumption of elevator and separator. With the increase of dosage, the process parameters will be greatly affected, so the amount of grinding aids should be effectively controlled.
Highlights
China is the largest producer of steel in the world [1]. can be divided into liquid grinding aids and solid grinding aids.According to the statistics of National Bureau of statistics, the Most of their basic components belong to organic surfactant.cumulative output of crude steel increased by 5.7% in 2017, They are mainly amines, alcohols, ethanolamines, reaching 831 million 730 thousand T [2]
With the attention paid by the cement and Xi and other studies show that the specific surface area, the concrete industry to the saving, consumption and emission activity index and the cementitious activity of steel slag with reduction, the slag powder made from steel slag has begun to the grinding agent are improved with the addition of the be used as the active mineral admixture in the production of grinding agent [14,15,16,17,18]
(4) Determination of activity index and fluidity ratio of steel slag powder according to GB/T 20491-2006 steel slag powder used in cement and concrete
Summary
China is the largest producer of steel in the world [1]. can be divided into liquid grinding aids and solid grinding aids. The comprehensive help the grinding of steel slag in Baosteel [12] It can improve utilization rate of steel slag in China is about 50% to 60% [4], the effect of the specific surface area to the activity index, and but only about 10% in building materials [5]. With the attention paid by the cement and Xi and other studies show that the specific surface area, the concrete industry to the saving, consumption and emission activity index and the cementitious activity of steel slag with reduction, the slag powder made from steel slag has begun to the grinding agent are improved with the addition of the be used as the active mineral admixture in the production of grinding agent [14,15,16,17,18].
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