Influence of Alkali Metal Oxide Slag Aggregating Agent on the Performance of Magnesium Desulfurization Slags
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摘要:
这是一篇冶金工程领域的论文。针对镁系脱硫剂脱硫过程中渣层稀薄很难扒除干净，致使高浓度脱硫渣带入转炉，引起转炉回硫问题。利用FactSage软件绘制了CaO-SiO2-Al2O3-MgO(FeO)脱硫渣的液相线图，分析了脱硫渣相组成及脱硫渣成分对液相区的影响，降低脱硫渣对温度的敏感度，有利于扒渣的进行。设计了主要成分为SiO2的聚渣剂，对脱硫渣进行性能调控。利用熔点熔速仪测定了脱硫渣的开始熔化温度、半球点温度和流动性温度，研究了聚渣剂添加量对脱硫渣熔化性能的影响。结果表明，脱硫渣与聚渣剂配比为5∶2～5∶5时，可增大脱硫渣的开始熔化温度和流动性温度之间的温度差，提高脱硫渣的热稳定性。酸性脱硫渣加入聚渣剂的配比取低值，脱硫渣碱度提高可以适当增加聚渣剂配比。
Abstract:This is an article in the field of metallurgical engineering. In view of the thin slag layer in the desulfurization process of magnesium-based desulfurizers, it is difficult to remove cleanly, resulting in high-concentration desulfurization slag being brought into the converter, causing the problem of sulfur back in the converter. The liquidus diagram of CaO-SiO2-Al2O3-MgO(FeO) desulfurization slag was drawn by FactSage software, and the phase composition of desulfurization slag and the influence of desulfurization slag composition on the liquid phase area were analyzed, and the sensitivity of desulfurization slag to temperature was reduced, which is conducive to slag removal. A slag aggregation agent whose main component is SiO2 was designed to control the performance of desulfurization slag. The initial melting temperature, hemispherical point temperature and fluidity temperature of the desulfurization slag were measured by a melting point melt rate meter, and the effect of the addition amount of slag aggregation agent on the melting performance of the desulfurization slag was studied. The results show that when the ratio of desulfurization slag to slag aggregation agent is 5∶2～5∶5, the temperature difference between the initial melting temperature and the fluidity temperature of the desulfurization slag can be increased, and the thermal stability of the desulfurized slag can be improved. The ratio of acid desulfurization slag added to the slag aggregate agent should be low, and the desulfurization slag basicity can be increased appropriately to increase the slag aggregate agent ratio.
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表 1 脱硫渣主要成分及范围/%
Table 1. Main components and scope of desulfurization slags
序号 CaO SiO2 Al2O3 MgO Fe2O3 S R 合计 脱硫渣1 30.00 35.29 12.6 9.5 11.41 1.2 0.85 100 脱硫渣2 30.92 34.36 12.6 9.5 11.42 1.2 0.90 100 脱硫渣3 31.81 33.48 12.6 9.5 11.41 1.2 0.95 100 脱硫渣4 32.61 32.61 12.6 9.5 11.48 1.2 1.00 100 脱硫渣5 33.45 31.86 12.6 9.5 11.39 1.2 1.05 100 脱硫渣6 34.19 31.08 12.6 9.5 11.43 1.2 1.10 100 脱硫渣7 34.92 30.37 12.6 9.5 11.41 1.2 1.15 100 脱硫渣8 36.91 28.39 12.6 9.5 11.40 1.2 1.30 100 脱硫渣9 40.19 25.12 12.6 9.5 11.39 1.2 1.60 100 
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表 2 聚渣剂的主要成分/%
Table 2. Main components of the slag polymerization agent
序号 CaO SiO2 Al2O3 K2O Na2O FeO R 合计 1 2 70 12 4 4 8 0.03 100
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