关键词: 钢渣泥, 湿磨时间, 抗压强度, 碳酸化程度, 热重-差热分析

Abstract: Iron recover by magnetic separation method is one of the effective methods for the utilization of steel slag,but steel slag mud producted has low hydration activity and there is no feasible means of utilization at present.Accelerated carbonation curing technology has a positive effect on improving the early strength and volume stability of steel slag products.The compressive strength and carbonation degree of steel slag mud carbonated block materials under different wet grinding time were studied by carbonation curing method,and the strength enhancement mechanism was clarified by XRD and TG-DTG analysis.The results showed that：① steel slag mud has carbonation and consolidation characteristics.Among them,the carbonation and consolidation characteristics of steel slag mud are the best after wet grinding for 60 min.The steel slag wet grinding has the best time.Too long grinding is not conducive to carbonation and consolidation.② The strength of steel slag mud is proportional to the carbonation degree.During the process of pressing and carbonization curing,the hydration reaction is very small,and the formation of carbonized products brings about an increase in strength.③ The steel slag undergoes a hydration reaction in the process of wet grinding into steel slag mud,and some of the hydration products are easily carbonated with CO₂ in the air to form carbonized products.Carbonation curing can make the carbonation reaction more thorough,and the crystal form of the carbonized product is more stable.The research results provide a reference for the comprehensive utilization of steel slag mud.

Key words: steel slag mud,wet grinding time,compressive strength,carbonation degree,TG-DTG analysis