高炉高铝初渣性能的基础研究

发布时间：2018-03-22 05:23

本文选题：初渣　切入点：高铝矿　出处：《辽宁科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：近些年来,各大钢厂之间的竞争越来越剧烈。为了经济利益的最大化,众多钢厂引进了成本较低的高铝矿,而众所周知,Al_2O_3含量会直接对炉渣的流动性、稳定性、高炉透气性以及渣铁能否顺利分离、生铁的质量造成重要影响。因此,在保证高炉生产顺利进行的条件下如何合理使用高铝铁矿石成为了众多学者的研究热点。国内外对高铝终渣的研究众多,已基本趋近于完善,而对高铝初渣的相关试验较少,试验数据有待补充。本文以高铝烧结矿在高炉软熔滴落过程中形成的高炉初渣为主要研究对象,在实验室条件下采用分析纯试剂进行初渣的制备,分别探讨了在CaO-SiO_2-MgO-Al_2O_3-FeO五元渣系中,FeO(5%-25%)、Al_2O_3(6%-15%)、R2对初渣粘度、熔化性温度、活化能和稳定性温度的影响规律。实验结果表明:在碱度(CaO/SiO_2)为2.0时,炉渣粘度随FeO含量的增大而减小,且FeO含量越大,炉渣的熔化性温度越低;熔化性温度也显示为相同的规律。固定(CaO/SiO_2)为2.0,FeO的质量分数分别为5%、15%、25%时,改变Al_2O_3(6%-15%)含量,发现随着Al_2O_3质量分数的增大,炉渣粘度呈现出降低的趋势。当FeO为10%,Al_2O_3为12%,碱度(CaO/SiO_2)为1.4-2.0时,炉渣逐渐表现为短渣特性,随炉渣碱度增大,粘度水平整体呈现增大趋势。炉渣的稳定性、活化能的变化与粘度的变化规律大致吻合,这与炉渣中的阴离子团有关系。在探讨CaO/MgO和Al_2O_3/SiO_2与初渣粘度的关系时发现,炉温为1583K时CaO/MgO与Al_2O_3/SiO_2分别为4.6和0.46左右时炉渣的粘度值最低。绘制炉渣的四元碱度与炉渣粘度关系曲线,得到二次曲线的关系,粘度最小值出现在四元碱度为1.4左右。通过傅里叶红外光谱的检测手段来分析炉渣内部微观结构,检测结果与炉渣粘度的变化规律相吻合。
[Abstract]:In recent years, the competition among the major steel mills has become more and more intense. In order to maximize the economic benefits, many steel mills have introduced high-alumina mines with lower costs, and it is well known that the content of Al _ 2O _ 3 directly affects the fluidity and stability of the slag. The permeability of blast furnace and the smooth separation of slag and iron have important influence on the quality of pig iron. How to use high alumina iron ore reasonably under the condition of ensuring the smooth progress of blast furnace production has become a hot research topic for many scholars. There are many researches on high aluminum final slag at home and abroad, which have basically approached to perfection, but few related tests have been done on high aluminum primary slag. The experimental data need to be supplemented. In this paper, the primary slag of blast furnace formed in the course of soft dropping of high alumina sinter is taken as the main research object, and the analytical pure reagent is used to prepare the initial slag under laboratory conditions. The effects of R2 on initial slag viscosity, melting temperature, activation energy and stability temperature in CaO-SiO_2-MgO-Al_2O_3-FeO quaternary slag system are discussed. The results show that the slag viscosity decreases with the increase of FeO content and the content of FeO increases with the increase of FeO content when the alkalinity of Cao / Sio _ 2 is 2.0, and the effect of R2 on the initial slag viscosity, melting temperature, activation energy and stability temperature is discussed. The lower the melting temperature of the slag, the more the melting temperature shows the same rule. The fixed Cao / SiO2) is 2.0% Feo, the mass fraction of 20% Feo is 5%, and at 25%, change the content of Al2O3 / 6-15%), and it is found that with the increase of the mass fraction of Al_2O_3, The slag viscosity shows a decreasing trend. When the FeO is 10 / Al _ S _ 2O _ 3 = 12 and the basicity / Cao / Sio _ 2 is 1.4-2.0, the slag gradually exhibits a short slag characteristic. With the increase of slag alkalinity, the viscosity level increases as a whole. The change of activation energy is consistent with the change of viscosity, which is related to the anionic group in slag. It is found that the relationship between CaO/MgO and Al_2O_3/SiO_2 and the viscosity of primary slag is discussed. When the furnace temperature is 1 583 K, the slag viscosity values are the lowest when CaO/MgO and Al_2O_3/SiO_2 are 4. 6 and 0. 46, respectively. The relationship between the four component alkalinity of slag and the viscosity of slag is drawn, and the relation of quadratic curve is obtained. The minimum value of viscosity appears in the quaternary alkalinity of about 1.4. The microstructure of slag is analyzed by means of Fourier infrared spectroscopy, and the results are in agreement with the variation of slag viscosity.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TF521;X757

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