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EXPERIMENTAL STUDY ON PREPARATION OF SLAG FIBER FROM BLAST FURNACE SLAG AND FLY ASH
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摘要: 根据CaO-SiO2-Al2O3-MgO-FeO-Na2O-K2O多元体系的液相线温度和黏度的计算结果，以高炉渣和粉煤灰为原料，用喷吹法转型制备了矿渣纤维。热力学计算结果表明，混合熔体制备矿渣纤维是可行的。经过1450℃时的喷吹实验，高炉渣比例为80%~60%时获得了细长、均匀的棉絮状高质量矿物棉纤维。系统研究了高炉渣配比、喷吹温度、喷吹压力等因素对纤维直径的影响。1450℃时，当高炉渣比例从20%增加至60%时，纤维平均直径从18.08 μm降低至6.03 μm；当高炉渣比例从60%增加到80%时，纤维平均直径为5~7 μm，单纤维平均拉伸强度约为1085 MPa；但是当高炉渣比例>80%时，喷吹产品以玻璃球为主。喷吹温度越高，喷吹压力越大，获得的纤维直径越小。从实际生产的角度出发，控制高炉渣比例为60%~80%，喷吹温度控制在1400~1500℃可以获得高质量的矿物棉纤维。Abstract: In this paper, On the basis of calculating the liquidus temperatures and viscosities of the slag system CaO-SiO2-Al2O3-MgO-FeO-Na2O-K2O, slag fiber was successfully prepared from blast furnace slag and coal ash by the high-speed air-injection method. The effect of factors such as mass ratio of blast furnace slag to coal ash (slag/coal), air-injection temperature and pressure was investigated in detail. While the air-injection experiment was carried out at 1450 ℃, the slag/coal was increased from 20% to 60%, the diameter of the slag fibers was subsequently decreased from 18.08 μm to 6.03 μm. the slag/coal was increased from 60% to 80%, the average fiber diameter was between 5 and 7 μm and the single fiber average tensile strength was about 1085 MPa. However, the glass beads, otherwise fibers, have been prepared if further increased the slag/coal. Hence, high quality mineral wool fibers could be obtained by controlling the addition ratio of the blast furnace slag between 60% and 80%, and the air-injection temperature between 1400 and 1500 ℃.
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Key words:
- blast furnace slag /
- fly ash /
- slag fiber /
- viscosity /
- fiber diameter
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