为找到合理有效的炉渣排氯制度，使得炉渣排氯能力最大化，在对高炉内氯元素进行热力学分析的基础上，研究了高炉渣的化学成分、温度以及恒温时间对排氯能力的影响。结果表明，高炉渣的排氯率随着炉渣碱度的提高而增加；其排氯率随温度的增加而降低；随w(MgO)的增加，其排氯率先增加后降低；随w(Al2O3)的增加，其排氯率先增加，当渣中w(Al2O3)超过16%时，其对炉渣排氯率的影响不大；随着恒温时间的延长，炉渣的排氯率降低。高炉在保证正常生产的前提下，应适当地提高炉渣碱度，降低高炉渣温度和增加出渣铁次数，w(MgO)和w(Al2O3)应保持在11.0%和16.0%左右，以提高炉渣的排氯能力，减少氯元素对高炉冶炼和后续设备产生的不利影响。
In order to find out the reasonable and effective dechlorination system of blast furnace slag and maximize the dechlorination capacity,on the basis of the thermodynamic analysis of chlorine reactions in blast furnace,the effects of chemical composition,temperature and the time in high temperature of blast furnace slag on the dechlorination capacity were studied. The results show that the dechlorination rate rised with the rising basicity and fell with the rising tempera-ture. The increase of w(MgO) made the dechlorination capacity increase first and then decrease,while for the condition with increasing w(Al2O3) ,the dechlorination capacity improved first and with w(Al2O3) beyond 16%,the dechlorination rate had no significant change. The extended time in high temperature had a negative effect on the dechlorination rate. On the basis of normal production,it is better to improve appropriately the basicity and decresase the temperature of blast furnace slag,increase the number of tapping of slag and iron,and maintain the w(MgO) and w(Al2O3) at approxi-mately 11%and 16%. The above measurements could improve the dechlorination capacity of blast furnace slag and re-duce the negative effect of chlorine on the blast furnace smelting and subsequent equipments.
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