耐火材料 ›› 2024, Vol. 58 ›› Issue (1): 48-52.DOI: 10.3969/j.issn.1001-1935.2024.01.010

• 研究开发 • 上一篇    下一篇

含TiC熔渣对MgO-C砖的侵蚀机制

王东生, 吕学明, 刘亚东   

  1. 攀钢集团研究院有限公司 钒钛资源综合利用国家重点实验室 四川攀枝花 617000
  • 收稿日期:2023-05-05 出版日期:2024-02-15 发布日期:2024-02-28
  • 作者简介:王东生:男,1988年生,硕士,高级工程师。E-mail:15881250692@163.com
  • 基金资助:
    中央在川大院大所聚源兴川项目(SC2023A1H01T)。

Corrosion mechanism of TiC-containing slag to MgO-C bricks

Wang Dongsheng, Lyu Xueming, Liu Yadong   

  1. First author's address: State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China
  • Received:2023-05-05 Online:2024-02-15 Published:2024-02-28

摘要: 为了有效回收钛资源和满足高温碳化—低温氯化工艺对耐火材料的要求,采用热力学计算、XRD和SEM等研究手段分析了高温碳化过程中含TiC熔渣对MgO-C砖的侵蚀机制。热力学计算结果表明:1)温度越高,熔渣的侵蚀能力越强,当温度低于1 560 ℃时,熔渣与MgO-C砖反应生成MgAl2O4、Mg2SiO4和MgTi2O4等高熔点物相,对MgO-C砖侵蚀较慢,但当温度高于1 560 ℃时,前期生成的高熔点物相逐渐溶解,从而对MgO-C砖侵蚀加剧;2)随着碳化反应的进行,熔渣中TiO2含量降低,TiC含量逐渐增加,熔渣对MgO-C砖的侵蚀逐渐减弱。用后MgO-C砖的显微结构分析发现:镁碳砖的侵蚀机制是气氛中氧气与碳反应,形成气孔,熔渣中TiO2和SiO2等再与基质MgO反应先形成高温中间相,随着反应进行再形成低熔点相,导致MgO-C砖逐渐被侵蚀。

关键词: 碳化反应, 高炉渣, 含TiC炉渣, MgO-C砖

Abstract: To effectively recover titanium resources and meet the requirements of the high temperature carbonization-low temperature chlorination process to refractories,the corrosion mechanism of TiC-containing slag to MgO-C bricks during high-temperature carbonization process was analyzed through thermodynamic calculations,XRD and SEM.The thermodynamic calculation results show that:(1)the higher the temperature,the stronger the corrosion ability of the slag;below 1 560 ℃,the slag reacts with MgO-C bricks to generate high melting point phases such as MgAl2O4,Mg2SiO4,and MgTi2O4,which slow down the corrosion rate of MgO-C bricks;however,at above 1 560 ℃,the high melting point phases generated in the early stage gradually dissolve,thereby intensifying the corrosion to MgO-C bricks;(2)as the carbonization reaction progresses,the TiO2 content in the slag decreases,while the TiC content gradually increases,and the corrosion of the slag to MgO-C bricks gradually weakens.According to the microstructure analysis of the used MgO-C bricks,the corrosion mechanism of MgO-C bricks is that O2 in air reacts with graphite forming pores;TiO2 and SiO2 in the slag react with MgO and the matrix of the brick to form high-temperature intermediate phases first,and as the reaction progresses,low melting point phases form,leading to the gradual corrosion of MgO-C bricks.

Key words: carbonization reaction, blast furnace slag, TiC-containing slag, MgO-C bricks

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