Effect of BF slag and desulfurized slag on corrosion resistance of Al2O3-SiC-C castables

doi:10.3969/j.issn.1001-1935.2021.02.013

Abstract

Abstract:

Effect of blast furnace slag and desulfurized slag on the corrosion of silica sol bonded Al₂O₃-SiC-C castables was studied by means of static crucible slag corrosion method.Tthe microstructure,the element distribution and the mineral phase of crucible samples after slag corrosion experiment were analyzed by means of SEM,EDS and XRD.The results show that the desulfurized slag with relatively high contents of CaO,SiO₂ and FeO has stronger corrosion to the sample.The reason is that CaO,SiO₂ and FeO react with Al₂O₃ in the matrix of the sample forming low melting point compounds,which aggravate the corrosion of Al₂O₃-SiC-C castables.

Key words: castable, desulfurized slag, alumina-silicon carbide-carbon, slag resistance

摘要：

采用静态坩埚法进行抗渣(高炉渣和脱硫渣)侵蚀试验,研究了高炉渣和脱硫渣对硅溶胶结合Al₂O₃-SiC-C质浇注料的侵蚀,并借助SEM、EDS、XRD等方法对静态坩埚抗渣试样进行了显微结构、元素分布和物相组成分析。结果表明,CaO、SiO₂和FeO含量相对较高的脱硫渣对静态坩埚抗渣试样的侵蚀能力较强。这是因为CaO、SiO₂和FeO与试样中基质部分的Al₂O₃发生反应,生成低熔点的化合物,加剧了Al₂O₃-SiC-C质浇注料的侵蚀。

关键词: 浇注料, 脱硫渣, Al₂O₃-SiC-C, 抗渣性

CLC Number:

TQ175.73

Wen Taiyang, Cui Yuanyan, Zhong Kai, Yang Bin. Effect of BF slag and desulfurized slag on corrosion resistance of Al₂O₃-SiC-C castables[J]. Refractories, 2021, 55(2): 148-150.

温太阳, 崔园园, 钟凯, 杨彬. 高炉渣和脱硫渣对Al₂O₃-SiC-C质浇注料的侵蚀研究[J]. 耐火材料, 2021, 55(2): 148-150.

Figures/Tables 6

References 6

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项目		平均值
化学组成(w)/%	Al₂O₃	73.25
	SiC	13.55
	C	1.92
体积密度/(g·cm^-3)	110 ℃,24 h	3.03
显气孔率/%	110 ℃,24 h	13.8
显气孔率/%	1 500 ℃,3 h	11.9
耐压强度/MPa	110 ℃,24 h	73.4
耐压强度/MPa	1 500 ℃,3 h	149
抗折强度/MPa	110 ℃,24 h	5.9
抗折强度/MPa	1 500 ℃,3 h	14.9

项目		平均值
化学组成(w)/%	Al₂O₃	73.25
	SiC	13.55
	C	1.92
体积密度/(g·cm^-3)	110 ℃,24 h	3.03
显气孔率/%	110 ℃,24 h	13.8
显气孔率/%	1 500 ℃,3 h	11.9
耐压强度/MPa	110 ℃,24 h	73.4
耐压强度/MPa	1 500 ℃,3 h	149
抗折强度/MPa	110 ℃,24 h	5.9
抗折强度/MPa	1 500 ℃,3 h	14.9

项目	w/%									碱度
项目	Fe₂O₃	FeO	SiO₂	Al₂O₃	CaO	MgO	MnO	TiO₂	S	碱度
高炉渣	0.25	0.27	33.2	15.04	38.33	8.07	0.50	1.99	0.86	1.15
脱硫渣	2.44	7.69	11.47	1.46	65.95	4.57	0.17	0.14	5.16	5.75

项目	w/%									碱度
项目	Fe₂O₃	FeO	SiO₂	Al₂O₃	CaO	MgO	MnO	TiO₂	S	碱度
高炉渣	0.25	0.27	33.2	15.04	38.33	8.07	0.50	1.99	0.86	1.15
脱硫渣	2.44	7.69	11.47	1.46	65.95	4.57	0.17	0.14	5.16	5.75

渣类型	反应界面直径/mm	侵蚀深度/mm
高炉渣	7.83	0.35
脱硫渣	9.03	3.12

Effect of BF slag and desulfurized slag on corrosion resistance of Al₂O₃-SiC-C castables

高炉渣和脱硫渣对Al₂O₃-SiC-C质浇注料的侵蚀研究

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