尾矿改性高炉渣的凝固行为与黏度行为

Solidification Behaviour and Viscosity Behaviour of Blast Furnace Slag Modified by Tailings

通过在高炉渣中加入不同质量分数的尾矿作为改性剂,研究了改性熔渣的凝固行为和黏度行为.采用X射线衍射和偏光显微镜研究了熔渣的矿物组成和显微结构,采用熔体物性测定仪研究了熔渣在1 200℃到1 475℃的黏度.结果表明：配加尾矿后,熔渣的酸度系数（Mk）达到1.2~1.8时,熔渣凝固后呈现非晶/玻璃质的特征;显微结构除Mk=1.8以外,均为致密均匀的结构.此外,熔渣成纤适宜的温度区间显著增大,尾矿适宜的配比为16.98%~34.18%.

Tailings of different mass fractions were added into the blast furnace slag（ BF slag） as the modifier,and the solidification behaviour and viscosity behaviour of the modified molten slag were studied. Mineral composition and microstructure of the modified molten slag were analyzed by X-ray diffraction（ XRD） and polarizing microscope. The viscosity curves between 1 200 ℃and 1 475 ℃ were studied by synthetic test instrument for the physical characteristics. The results indicated that when the acidity coefficient（ Mk） of the molten slag reaches 1. 2 ~ 1. 8 after adding tailings, the solidification structure of the molten slag has mainly an amorphous / vitreous character,and the microstructure is a compact and uniform structure except for Mk= 1. 8. In addition,the suitable temperature range for melting fabrication is significantly increased. The appropriate mass fraction of tailings is 16. 98% ~ 34. 18%.