钛磁铁矿和钛铁矿冶炼渣的相平衡研究

廖金发; 赵宝军

doi:10.1007/s12613-021-2376-1

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(12): 2162-2171

Jinfa Liaoand Baojun Zhao, Phase equilibrium studies of titanomagnetite and ilmenite smelting slags, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2162-2171. https://doi.org/10.1007/s12613-021-2376-1

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Jinfa Liaoand Baojun Zhao, Phase equilibrium studies of titanomagnetite and ilmenite smelting slags, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2162-2171. https://doi.org/10.1007/s12613-021-2376-1

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研究论文

钛磁铁矿和钛铁矿冶炼渣的相平衡研究

廖金发¹,
赵宝军^{1, 2,}

1)
江西理工大学国际创新研究院, 江西 330000, 中国
2)
Sustainable Minerals Institute, University of Queensland, Brisbane, Saint Lucia 4072, Australia

通讯作者:
赵宝军 E-mail: bzhao@jxust.edu.cn

文章亮点

(1) 针对高炉处理含钛铁矿易产生高熔点TI(CN)，显著增加渣和铁水粘度，且渣中TiO₂难以回收的难题，提出了利用HIsmelt技术处理钛磁铁矿及与钛铁矿的混合原料，同时生产铁和高钛渣的工艺。

(2) 通过系统详实的实验提供了HIsmelt工艺冶炼钒钛磁铁矿与钛铁矿的混合原料的具体渣型和温度范围，在顺利产出满足炼钢需求的铁水和生产钛白的高钛渣的同时在水冷内壁形成保护渣层，延长炉体寿命。

(3) 冶炼钛磁铁矿和钛铁矿的混合矿可以获得高TiO₂和CaO/SiO₂的渣,易于制备钛白且脱硫效果好(4)实验数据与FactSage热力学模型计算结果进行比较，指出了目前含钛热力学数据库的局限性及原因，提出了热力学模型数据库优化的方向。

中文摘要

高炉冶炼含钛铁矿时，因强还原条件和高温会形成高熔点Ti(C,N)，导致炉渣和铁水粘度增加，使高炉操作难以顺利进行。必须掺杂高品位铁矿稀释原料中的氧化钛，使高炉渣所含的20wt%~30 wt% TiO₂难以回收，造成资源浪费。HIsmelt是近年来开发的绿色炼铁新工艺，不需要焦炭和烧结矿。HIsmelt工艺中炉内的氧分压高于高炉中的分压，温度显著低于高炉风口，因此避免了Ti(C,N)的形成。HIsmelt炉的水冷内壁会造成大量热损失，增加能耗，而且有炉衬烧穿的潜在风险。在HIsmelt工艺中以CaO为助剂熔炼富含TiO₂的铁矿会产生Al₂O₃–MgO–SiO₂–CaO–TiO₂渣。利用高温平衡、冷淬和电子探针显微分析技术研究了该渣系的相平衡，探讨了处理钛磁铁矿以及钛磁铁矿和钛铁矿混合矿的过程中渣液相温度与助剂添加量的关系。在所研究的组成范围内观察到的初晶相有板钛矿M₃O₅（MgO·2TiO₂–Al₂O₃·TiO₂）、尖晶石（MgO·Al₂O₃）、钙钛矿CaTiO₃和金红石TiO₂。结果表明，在TiO₂和M₃O₅相区中，渣液相温度随着CaO含量的增加而降低，而在尖晶石和CaTiO₃初晶相区的液相温度则随CaO含量的增加而升高。通过控制渣液相温度可以在炉子内壁上形成保护渣层，减少热损失，降低内衬耐火材料消耗。此外，讨论了炉渣碱度对炉渣液相线温度的影响，发现冶炼钛磁铁矿和钛铁矿的混合矿可以获得低硫铁水和高TiO₂炉渣，具有显著的成本和资源优势。最后，将实验测定的液相温度和固溶体成分与FactSage计算结果进行了比较，指出目前含钛热力学数据库的局限性和改进方向。

关键词:

Research Article

Phase equilibrium studies of titanomagnetite and ilmenite smelting slags

Jinfa Liao¹ and
Baojun Zhao^{1, 2,}

+ Author Affiliations

Abstract

Abstract

The phase equilibrium information of slag plays an important role in pyrometallurgical processes to obtain optimum fluxing conditions and operating temperatures. The smelting reduction of titanomagnetite and ilmenite ores in an iron blast furnace (BF) can form Ti(C,N) particles, causing the increased viscosities of slag and hot metal. HIsmelt has been developed in recent years for ironmaking and does not need coke and sinter. The formation of Ti(C,N) in the HIsmelt process is avoided because the oxygen partial pressure in the process is higher than that in the BF. The smelting of TiO₂-containing ores in the HIsmelt process results in Al₂O₃–MgO–SiO₂–CaO–TiO₂ slag. Phase equilibrium in this slag system has been investigated using equilibration, quenching, and electron probe microanalysis techniques. The experimental results were presented in two pseudo-binary sections, which represent the process of HIsmelt for the treatment of 100% titanomagnetite ore and mixed titanomagnetite+ilmenite ore (mass ratio of 2:1), respectively. The primary phases observed in the composition range investigated include pseudo-brookite M₃O₅ (MgO·2TiO₂–Al₂O₃·TiO₂), spinel (MgO·Al₂O₃), perovskite CaTiO₃, and rutile TiO₂. The results show that the liquidus temperatures decrease in the TiO₂ and M₃O₅ primary phase fields and increase in the spinel and CaTiO₃ primary phase fields with the increase in CaO concentration. The calculation of solid-phase fractions from the experimental data has been demonstrated. The effect of basicity on the liquidus temperatures of the slag has been discussed. The smelting of titanomagnetite plus ilmenite ores has significant advantages to obtain low-sulfur hot metal and high-TiO₂ slag. Experimentally determined liquidus temperatures were compared with the FactSage predictions to evaluate the existing thermodynamic databases.
- HIsmelt;
- slag;
- phase equilibrium;
- Al₂O₃–MgO–SiO₂–CaO–TiO₂ system;
- FactSage

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