摘要:
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。
关键词:
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高炉 /
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瓦斯泥 /
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自还原 /
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热重分析 /
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热力学平衡
Abstract:
The heating self-reduction process of blast furnace(BF) gas slime was studied by non-isothermal thermogravimetric(TG) analysis and isothermal heating in Muffle Furnace.The equilibrium compositions and metallization rate of iron and zinc oxides for BF gas slime in reduction process were calculated by HSC thermodynamic calculation software,and the mechanism for reduction of iron and zinc oxides was also discussed.The results show that the heating self-reduction process of BF gas slime may be divided into five stages:I(22.0~390.1℃),physical adsorption of carbon gasification reaction; II(437.7~758.9℃),reduction of iron oxide with increase in metallization rate; III(758.9~936.1℃),co-reduction of iron and zinc oxides with increase in metallization rate of iron and zinc; IV(936.1~1 031.7℃),iron and zinc oxides are reduced sufficiently,with maximum 70% and 99.7% of metallization rate for iron and zinc,respectively; V(1 031.7~1 255.3℃),iron and zinc oxides are reduced completely,and zinc gas may be oxidized.
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