摘要:
对高炉渣在不同冷却方式(随炉冷、空冷和水冷)下的析晶行为进行研究,采用FactSage软件、X射线衍射仪和扫描电子显微镜探索冷却方式对高炉熔渣析晶量的影响规律。结果表明:高炉渣会在1 425.9℃附近析出黄长石晶体,1 268.5℃结束析晶,析晶温度范围约为157.4℃。在相同的冷却温度下,由于热量交换速率的差异,冷却方式对高炉熔渣析晶影响较为明显。随炉冷的渣样中,析晶程度最高;空冷中渣样的析晶量明显减少,晶体与玻璃体共存,二者析出的晶体均为钙镁黄长石和钙铝黄长石;水冷的渣样由于冷却速率较快,晶体未能排列形成非晶态的玻璃体。
Abstract:
The crystallization behaviors of blast furnace slag under different cooling modes including fur-nace cooling,air cooling and water cooling were investigated by Fact Sage simulation software,XRD and SEM,to explore the influence of cooling modes on the crystallization quantity of blast furnace slag.The re-sults show that the crystallization of the slag occurs at 1 425.9℃ with melilite precipitated and is comple-ted at 1 268.5℃,with 157.4℃ of temperature range.Due to the difference in heat exchange rate,the crystallization of blast furnace slag is obviously affected by the cooling methods at the same cooling tem-perature.The highest degree of crystallization can be obtained in the slag with furnace cooling mode,while the crystallization amount distinctly decreases in the slag by air cooling with the crystals and amorphous materials coexisted. The akermanite and gehlenite are the crystals precipitated in both of the cooling modes.With the water cooling method,amorphous materials are formed under rapid cooling rate.
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