Evolution of physicochemical properties of quick lime at converter-smelting temperature
Evolution of physicochemical properties of quick lime at converter-smelting temperature
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DOI：
10.1515/htmp-2021-0008
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发表时间：
2021-03-02
影响因子：
1.5
通讯作者：
Zhu, Hangyu
中科院分区：
文献类型：
--
作者：
Zhang, Mengxu;Li, Jianli;Zhu, Hangyu
f-CaO水化引起的体积稳定性是炼钢渣综合利用的主要障碍之一。针对石灰溶解不完全而产生的f-CaO，需要在转炉过程中强化石灰的溶解行为。石灰的反应活性决定了溶解效率，并与其微观结构密切相关。实验结果表明，随着温度的升高，生石灰的反应活性和孔隙率降低，平均孔径增大。 CaO晶体在晶界迁移的作用下逐渐长大。当温度从1350℃升高到1600℃时，石灰反应活性从237.60mL降低到40.60mL，孔隙率从30.55降低到15.91%，平均孔径从159.10nm增大到1471.80nm，平均CaO粒径从0.33μm增大到9.61μm。结果表明，由于CaO晶体的变形和生长以及活性石灰孔隙率的降低，反应活性降低。这会对石灰的溶解造成障碍，不利于炉渣中f-CaO的控制。
The volume stability caused by the hydration of f-CaO is one of the main obstacles to the comprehensive utilization of steel-making slag. In view of the f-CaO produced by incomplete dissolution of lime, it is necessary to strengthen the dissolution behavior of lime in the converter process. The reactivity of lime determines the dissolution efficiency and is closely related to its microstructure. The experimental results show that the reactivity and porosity of quick lime decrease and the average diameter of pore increases with an increase in temperature. The CaO crystals gradually grow up under the action of grain boundary migration. When the temperature increased from 1,350 to 1,600 degrees C, the lime reactivity decreased from 237.60 to 40.60mL, the porosity decreased from 30.55 to 15.91%, the average pore diameter increased from 159.10 to 1471.80 nm, and the average CaO particle size increased from 0.33 to 9.61 mu m. The results indicate that reactivity is decreased because of the deformation and growth of CaO crystals and the decrease in porosity in reactive lime. This will cause an obstacle to the dissolution of lime and is not conducive to the control of f-CaO in slag.