高炉渣和粉煤灰制备矿渣纤维试验研究

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18.08μm降低至6.03μm;当高炉渣比例从60%增加到80%时,纤维平均直径为5～7μm,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。

EXPERIMENTAL STUDY ON PREPARATION OF SLAG FIBER FROM BLAST FURNACE SLAG AND FLY ASH

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 ℃.