Slag corrosion resistance of typical refractories for rotary kilns of hazardous waste disposal industry

doi:10.3969/j.issn.1001-1935.2021.02.007

Refractories ›› 2021, Vol. 55 ›› Issue (2): 121-125.DOI: 10.3969/j.issn.1001-1935.2021.02.007

Slag corrosion resistance of typical refractories for rotary kilns of hazardous waste disposal industry

Yi Shuai¹^,²⁾(), Deng Lina¹^,²⁾, Xu Qian¹^,²⁾, Si Guodong¹^,²⁾, Chen Meina¹^,²⁾, Xue Fei¹^,²⁾, Zeng Luju¹^,²⁾, Xie Jinli¹^,²⁾

1)China Building Material Test & Certification Group Co.,Ltd.,China Building Materials Academy Co.,Ltd.,Beijing 100024,China

Received:2020-11-03 Online:2021-04-15 Published:2021-04-15

危废处置回转窑用典型耐火材料抗熔渣侵蚀性能研究

易帅¹^,²⁾(), 邓丽娜¹^,²⁾, 许谦¹^,²⁾, 司国栋¹^,²⁾, 陈美娜¹^,²⁾, 薛飞¹^,²⁾, 曾鲁举¹^,²⁾, 谢金莉¹^,²⁾

1)中国建筑材料科学研究总院有限公司中国建材检验认证集团股份有限公司北京 100024
2)国家耐火材料产品质量监督检验中心(北京) 北京 100024

作者简介:易帅:男,1987年生,博士,高级工程师。E-mail:yishuai31@126.com
基金资助:
中国建筑材料科学研究总院有限公司青年科学基金(YD-668)

Abstract

Abstract:

The slag corrosion resistance at 1 100 ℃ and 1 300 ℃ of several typical refractories for rotary kilns of the hazardous waste disposal industry,chrome-zirconia corundum 50 brick,chrome-zirconia corundum 30 brick,chrome-corundum brick,high alumina brick,corundum-mullite brick,and alumina-chrome silicon carbide brick,was compared.The results show that:1)after the corrosion test at 1 100 ℃,the six groups of samples all show good resistance to slag corrosion and penetration,and a large amount of slag remains in the crucible;2)after the corrosion test at 1 300 ℃,the slag corrosion and penetration of the six groups of samples are significantly increased;the chrome-zirconia corundum 50 brick shows excellent corrosion resistance but molten slag penetration is observed;the chrome-zirconia corundum 30 brick and the chrome-corundum brick are slightly corroded,and their penetration degree increases;due to the extremely low solubility of chromium oxide in the slag,the chrome-containing samples have excellent resistance to slag corrosion but common resistance to slag penetration;the high alumina brick is corroded the most seriously:the interface structure between the sample and the slag is no longer visible;corundum-mullite brick has anorthite formed after the working layer is corroded by the slag,which promotes the densification of the matrix and hinders the further penetration of the slag;alumina-chrome silicon carbide bricks have poor resistance to corrosion and penetration due to the high apparent porosity.

Key words: hazardous waste, rotary kilns, molten slag corrosion, chrome-zirconia corundum brick, chrome-corundum brick, high alumina brick, corundum-mullite brick, alumina-chrome silicon carbide brick

摘要：

对比了危废处置回转窑用几种典型耐火材料铬锆刚玉50砖、铬锆刚玉30砖、铬刚玉砖、高铝砖、刚玉莫来石砖和铝铬碳化硅砖分别在1 100和1 300 ℃的抗熔渣侵蚀性能。结果表明:1)在1 100 ℃侵蚀试验后,6组试样均表现出较好的抗侵蚀性能和抗渗透性能,试验后坩埚内都残留了大量熔渣。2)在1 300 ℃侵蚀试验后,6组试样的熔渣侵蚀和渗透行为显著加剧。铬锆刚玉50砖依然保持了较优异的抗侵蚀性,但出现了熔渣渗透现象;铬锆刚玉30砖和铬刚玉砖被轻微侵蚀,同时渗透程度加大;由于氧化铬在熔渣中的溶解度极低,含铬试样具有优异的抗熔渣侵蚀性能,但其抗熔渣渗透性能一般;高铝砖侵蚀最为严重,已经看不到试样与渣接触的界面结构;刚玉莫来石砖工作层被熔渣侵蚀后有钙长石生成,促进了基体的致密化,阻碍了熔渣的进一步渗透;由于显气孔率高,铝铬碳化硅砖的抗侵蚀性能和抗渗透性能均较差。

关键词: 危废处置, 回转窑, 熔渣侵蚀, 铬锆刚玉砖, 铬刚玉砖, 高铝砖, 刚玉莫来石砖, 铝铬碳化硅砖

CLC Number:

TQ175

Yi Shuai, Deng Lina, Xu Qian, Si Guodong, Chen Meina, Xue Fei, Zeng Luju, Xie Jinli. Slag corrosion resistance of typical refractories for rotary kilns of hazardous waste disposal industry[J]. Refractories, 2021, 55(2): 121-125.

易帅, 邓丽娜, 许谦, 司国栋, 陈美娜, 薛飞, 曾鲁举, 谢金莉. 危废处置回转窑用典型耐火材料抗熔渣侵蚀性能研究[J]. 耐火材料, 2021, 55(2): 121-125.

Figures/Tables 7

Table 1 Chemical composition and physical properties of test bricks

试样	化学组成(w)/%						体积密度/ (g·cm^-3)	显气孔率/%	常温耐压强度/MPa
试样	Al₂O₃	Cr₂O₃	ZrO₂	SiO₂	SiC	Fe₂O₃	体积密度/ (g·cm^-3)	显气孔率/%	常温耐压强度/MPa
铬锆刚玉50砖	28.78	51.11	10.98				3.78	15.3	282
铬锆刚玉30砖	45.72	30.81	14.54				3.54	15.2	163
铬刚玉砖	90.83	3.02	1.96			0.06	3.18	18.7	90.2
高铝砖	73.29			20.69		1.49	2.46	23.1	89.1
刚玉莫来石砖	83.17			15.23			2.81	15.5	76.2
铝铬碳化硅砖	87.61	2.78		5.00	2.56	0.08	3.19	20.8	131

Fig.1 XRD patterns of molten slag

Fig.2 Section photographs of specimens after corrosion test at different temperatures

Fig.3 Corrosion and penetration depths of specimens after corrosion test at different temperatures

Fig.4 SEM images of specimens after corrosion test at 1 300 ℃

Fig.5 SEM images of specimens after corrosion test at 1 300 ℃

Fig.6 XRD patterns of corundum-mullite bricks before and after corrosion test at 1 300 ℃

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Slag corrosion resistance of typical refractories for rotary kilns of hazardous waste disposal industry

危废处置回转窑用典型耐火材料抗熔渣侵蚀性能研究

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