高炉熔渣制备矿渣棉调质剂的研究

Research on Conditioning Agents for Preparation of Slag Wool by Blast Furnace Slag

针对高炉渣制备矿渣棉的调质过程,研究铁尾矿、碱度、MgO和Al2O3含量对高炉渣黏度和熔化性温度的影响规律。结果表明：铁尾矿能够使高炉渣由短渣特性向长渣特性转化,黏度变化更加平稳,但铁尾矿加入量超过20%后,熔渣黏度和熔化性温度增加,不利于熔渣直接制备矿渣棉;采用化学纯试剂对高炉渣进行调质时,碱度升高使得熔渣黏度向短渣特性进一步转化,熔化性温度升高,不利于熔渣流动性的提高;随着MgO含量增加,熔渣黏度和熔化性温度均呈现先降低后增加的趋势,MgO含量在8%~10%时,熔渣流动性较好;研究中Al2O3含量相对较小,Al2O3含量变化时,熔渣黏度和熔化性温度变化较小,对熔渣流动性影响较小。

The influences of iron tailings, basicity, contents of MgO and Al2O3 oil the viscosity and melt- ing temperature of the blast furnace slag were investigated in adjustment of the slag for preparation of slag wool. The results show that with increase in content of added iron tailing the characteristics of blast furnace slag transforms from short to long feature and the viscosity of the slag changes smoothly. When the addition amount of iron tailings is more than 20%, the viscosity and melting temperature of the slag increase and it is not suitable for direct preparation of slag wool. During the adjusting process for the blast furnace slag with chemical reagent, increasing basicity leads to the further transformation to short feature of slag characteristics and increase in melting temperature which is not benefit for fluidity of the slag. With increase in the content of MgO, both the viscosity and melting temperature of the blast furnace slag firstly decrease and then increase. A better fluidity of the slag can be reached with 8% -10% MgO. Because the content of Al2O3 in the slag is relatively small, the viscosity and melting temperature of blast furnace slag change slightly with Al2O3 content, which has little influence on the fluidity of the slag.