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利用非等温热重分析和马弗炉定温加热试验研究高炉瓦斯泥加热自还原的变化过程,并运用HCS热力学计算软件计算瓦斯泥自还原过程中Fe、Zn氧化物还原的平衡组成及其金属化率,探讨了瓦斯泥加热自还原过程铁和锌氧化物还原规律。结果发现,高炉瓦斯泥自还原过程可分为五个阶段:Ⅰ阶段(22.0~390.1℃),发生C的气化反应和物理吸附;Ⅱ阶段(437.7~758.9℃),发生铁氧化物还原,金属化率不断增大;Ⅲ阶段(758.9~936.1℃),铁、锌氧化物还原共存,铁、锌金属化率仍不断增加;Ⅳ阶段(936.1~1 031.7℃),铁氧化物和锌氧化物还原较充分,铁、锌金属化率最大分别达到70%和99.7%;Ⅴ阶段(1 031.7~1 255.3℃),铁氧化物和锌氧化物反应完全,此过程气态锌可能发生氧化。
The non-isothermal thermogravimetric analysis and muffle furnace temperature-fixed heating test were used to study the process of self-reduction of blast furnace gas sludge heating and the HCS thermodynamic calculation software was used to calculate the equilibrium composition of Fe and Zn oxide reduction during the process of gas mud self-reduction and its metal The rate of reduction of iron and zinc oxides in the process of gas mud self-reduction was discussed. The results show that the blast furnace gas sludge self-reduction process can be divided into five stages: Ⅰ stage (22.0 ~ 390.1 ℃), C gasification reaction and physical adsorption; Ⅱ stage (437.7 ~ 758.9 ℃), iron oxide reduction occurs, Metallization rate increased continuously. In the third stage (758.9 ~ 936.1 ℃), coexistence of iron and zinc oxide coexisted, and the metallization rates of iron and zinc were still increasing. In the fourth stage (936.1 ~ 1031.7 ℃), iron oxide and zinc oxide In the stage Ⅴ (1 031.7 ~ 1 255.3 ℃), the reaction between iron oxide and zinc oxide is complete, and the oxidation of gaseous zinc may occur in this process.