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针对碱度、温度、熔渣氧化性及目标锰含量对锰直接合金化过程的影响,通过熔渣理化性能分析,应用分子-离子共存理论建立了四元熔渣活度模型及渣-钢间锰分配比模型,并应用该模型对锰直接合金化过程熔渣碱度、温度、氧化性及锰含量的影响进行了研究,为锰直接合金化冶炼工艺优化提供了理论依据。模型计算结果表明,直接合金化过程熔渣适宜的二元碱度为1.4～2.0;熔渣低氧化性有利于锰直接合金化反应进行,提高锰的收得率;从热力学方面分析,目标锰含量(0.5%～3%,质量分数,下同)越高,锰冶炼平衡收得率越高;炼钢温度为1 450～1 650℃时,温度变化对锰直接合金化影响较小。
According to the influence of alkalinity, temperature, slag oxidizability and target manganese content on the direct alloying process of manganese, a four-element slag activity model and slag-steel Manganese distribution ratio model. The influence of the model on the slag basicity, temperature, oxidizability and manganese content in the process of direct alloying manganese was studied, which provided a theoretical basis for the optimization of the direct alloying smelting process of manganese. The model calculation results show that the suitable binary basicity of slag in the direct alloying process is 1.4-2.0. The low oxidation of slag is beneficial to the direct alloying reaction of manganese and the yield of manganese is increased. According to the thermodynamic analysis, the target manganese (0.5% ~ 3%, mass fraction, the same below), the higher the equilibrium yield of manganese smelting; the temperature change of 1 450 ~ 1 650 ℃ steelmaking temperature has little effect on the direct alloying of manganese.