钒钛磁铁矿冶炼铁水的黏流性能及其影响因素

doi:10.13228/j.boyuan.issn0449-749x.20210260

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摘要钒钛磁铁矿是中国重要的铁矿资源之一,具有极高的综合利用价值,钒钛磁铁矿的高效冶炼将带来巨大的经济收益,铁水的黏流性能是影响高炉顺行的关键因素。钒钛磁铁矿经高炉冶炼得到的钒钛铁水,其流动性能较普通矿冶炼的铁水差,导致出铁困难、黏罐和黏沟等现象,严重影响冶炼的顺行。以现场含钒、钛铁水为研究对象,通过自主研发的高精度低黏性熔体黏度测试仪,获得钒、钛含量对铁水黏度的影响规律,并结合微观原位分析表征手段,探明铁水中高熔点物相的长大机制,深层次揭示成分对黏度的影响机理。研究结果表明,当钛质量分数为0.10%～0.50%时,随着钛含量的增加,铁水黏度逐渐增大。当钒质量分数低于0.30%时,钒含量的增加对铁水黏度的影响不显著,而当钒质量分数高于0.30%时,随着钒含量的增加,铁水的黏度急剧增大。此外,微观原位分析结果表明,铁水黏度随钒、钛含量增大的主要原因是由于铁水中高熔点碳氮化物(TiC,TiN,VC,VN)的析出。这些碳氮化物形核析出后,弥散分布于铁水中,使铁水的黏度增大,流动性变差。铁水中的高熔点物相存在两种长大机制,分别为高熔点物相的形核长大和高熔点物相形核后通过碰撞聚合长大。

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	李涛

关键词 ：钒钛磁铁矿, 黏度, 铁水, 碳氮化钛, 形核生长

Abstract：Vanadium-titanium magnetite is one of the important iron ore resources in China, which has extremely high comprehensive utilization value. The efficient smelting of vanadium-titanium magnetite will bring huge economic benefits, the viscous flow properties of molten iron is the key factor affecting the anterograde of the blast furnace. The molten iron bearing vanadium (V) and titanium (Ti) can be smelted from the vanadium-titanium magnetite ore by blast furnace. The fluidity of V-Ti bearing molten iron is poorer than that smelted from the ordinary iron ore, which may result in difficulties in iron discharge and retaining of molten metal in tapping channel and iron ladle. In this case, the smelting process can be seriously affected. The effects of V and Ti contents on viscosity of molten iron were obtained through the self-developed viscosity tester in the research of V-Ti bearing molten iron.Meanwhile, the growth mechanism of high melting point phase in molten iron was explored by means of microscopic in-situ analysis and characterization, and the influence mechanism of composition on viscosity was deeply revealed.The results indicate that the viscosity of molten iron gradually increased with the increasing of Ti content when the mass percent of Ti varied from 0.10% to 0.50%. The V content had no significant effect on viscosity of molten iron when the mass percent of V was lower than 0.30%, while the viscosity of molten iron increased sharply with the increasing of the mass percent of V when it was higher than 0.30%. In addition, the main reason for this phenomenon is the precipitation of high melting point carbonitrides (TiC, TiN, VC, VN) which can distribute in molten iron, and then increases the viscosity and deteriorates the fluidity of molten iron. It is demonstrated that there are two mechanisms for the growth of high melting point phases in molten iron. One is the nucleation growth of high melting point phase, and the other is the growth of high melting point phase by collisional polymerization after nucleation.

Key words： vanadium-titanium magnetite viscosity molten iron titanium carbonitride nucleation growth

收稿日期: 2021-05-06

引用本文:

侯飘, 余文轴, 白晨光, 潘成, 袁万能, 李涛. 钒钛磁铁矿冶炼铁水的黏流性能及其影响因素[J]. 钢铁, 2022, 57(1): 57-65. HOU Piao, YU Wen-zhou, BAI Chen-guang, PAN Cheng, YUAN Wan-neng, LI Tao. Viscous flow properties and influencing factors of vanadium-titanium magnetite smelting iron[J]. Iron and Steel, 2022, 57(1): 57-65.

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