Grinding Characteristics of Steel Slag
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摘要:
研究了粉磨时间对钢渣粉比表面积的影响，并通过激光粒度仪（LPS）、X射线衍射仪（XRD）对钢渣粉的粒度分布特征和颗粒形貌进行了探讨，并研究了不同粉磨时间钢渣粉对混凝土抗压强度的影响。结果表明：钢渣的易磨性较差；随着粉磨时间增加，超细颗粒数量不断增加，掺钢渣粉混凝土的强度也逐渐提高，但是粉磨成本也相应增加。钢渣粉较为合适的粉磨时间为90 min，此时比表面积为650 m2/kg。
Abstract:The influence of grinding time on specific surface area of steel slag powder was studied in this paper. The particle size distribution and particle morphology were investigated by laser particle sizer (LPS), X-ray diffraction (XRD). And the influence of steel slag powder ground with different time on compressive strength of concrete was studied. The results showed that the grindability of steel slag was poor. With the increase of grinding time, the proportion of micro particles in the steel slag powder was gradually increased and the compressive strength of concrete also gradually improved. Accordingly, the grinding cost also increased. The suitable grinding time of steel slag powder was 90 min, and the specific surface area could reach to 650 m2/kg.
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Key words:
- steel slag /
- grindability /
- particle size distribution /
- concrete
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表 1 主要原料化学成分分析结果 /%
Table 1. Chemical composition of raw materials
原料 SiO2 Al2O3 Fe2O3 CaO MgO SO3 Na2O K2O TiO2 钢渣 18.16 6.24 17.66 42.58 5.26 0.29 0.12 0.12 1.60 矿渣 26.15 13.49 2.96 41.41 10.09 0.83 0.27 0.35 1.67 石膏 3.14 1.48 0.71 45.31 0.58 47.26 0.10 0.35 0.07 
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表 2 钢渣的粒径分布
Table 2. Particle size distribution of steel slag
粒级/mm 个别产率/% 正累积产率/% +10 4.23 4.23 10~4.75 30.09 34.32 4.75~2.36 23.47 57.79 2.36~1.18 16.78 74.57 1.18~0.6 11.98 86.55 0.6~0.3 8.44 94.99 -0.3 5.01 100.00 合计 100.00 —
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表 3 不同粉磨时间钢渣粉的特征粒径
Table 3. Character diameter of steel slag powder for different grinding time
粉磨时间 特征粒径/μm D10 D50 D90 30 min 1.67 7.02 24.21 60 min 1.09 3.97 16.55 90 min 0.82 2.17 7.75 120 min 0.67 1.51 4.17
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