Corrosion-resistant Refractory Linings for Hazardous Waste Treatment in Rotary Kilns

doi:10.19691/j.cnki.1004-4493.2021.02.003

China's Refractories ›› 2021, Vol. 30 ›› Issue (2): 12-15.DOI: 10.19691/j.cnki.1004-4493.2021.02.003

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Corrosion-resistant Refractory Linings for Hazardous Waste Treatment in Rotary Kilns

Chongchong NIU¹^,^*(), Christina STIMPFL², Danting ZHAO¹

1 RHI Magnesita, Dalian 116600, China
2 RHI Magnesita, Shanghai 200021, China

Online:2021-06-15 Published:2021-06-15
Contact: Chongchong NIU
About author:Chongchong Niu studied material science at Sinosteel Luoyang Institute of Refractories Research Co., Ltd. After his master’s degree he began to work at RHI Magnesita. More than seven years he is working in the research and development department, specialized in alumina silica products which are used in energy, environment and chemistry and especially in special waste incineration applications.

Abstract

Abstract:

Mega trends like urbanization, industrialization and growing population drive the demand of daily necessaries and therefore result in increased refractory consumption for waste treatment carried out at elevated temperatures. It is estimated that for burning 1 t of waste about 5.5 kg of refractory materials need to be consumed. In the present study, the corrosion resistance of refractory bricks based on alumina-chromia and alumina-silica was tested by exposing them to slag from hazardous waste incineration. Samples from the cup test were investigated macroscopically and mineralogically. They showed that alumina-chromia bricks had high corrosion resistance when in contact with the tested slags, while alumina-silica bricks containing silicon carbide showed an overall good performance.

Key words: hazardous waste treatment, alumina-silica, cup test

Chongchong NIU, Christina STIMPFL, Danting ZHAO. Corrosion-resistant Refractory Linings for Hazardous Waste Treatment in Rotary Kilns[J]. China's Refractories, 2021, 30(2): 12-15.

Figures/Tables 9

Fig. 1 Schematic drawing of a rotary kiln with post-combustion chamber for burning hazardous waste ? RHI Magnesita

Table 1 Chemical composition and apparent porosity of refractory bricks used in slag tests

	Alumina-chromia Sample 1	Alumina-chromia Sample 2	Alumina-silica Sample 3	Alumina-silica+SiC Sample 4
Al₂O₃	84.0	83.5	88.0	69.0
SiO₂	1.8	8.5	9.0	20.0
Fe₂O₃	0.2	0.3	0.3	1.3
Cr₂O₃	10.0	4.5	-	-
Apparent porosity	17.0	12.0	14.0	16.0

Table 2 Chemical composition of slags used in corrosion tests

	Slag 1	Slag 2
Al₂O₃	20.9	18.4
SiO₂	38.9	34.0
Fe₂O₃	11.8	11.3
CaO	13.2	15.2
MgO	2.0	10.3
TiO₂	6.4	5.5
Na₂O	3.2	2.0
K₂O	0.4	0.6
P₂O₅	1.9	1.6
Cr₂O₃	0.4	0.3
MnO	0.3	0.4
NiO	0.3	0.1
BaO	0.3	0.3

Fig. 2 Cross-sections of cup test specimens (slag 1, samples 1-4) ? RHI Magnesita

Fig. 3 Cross-sections of cup test specimens (slag 2, samples 1-4) ? RHI Magnesita

Fig. 4 Cup test—sample 1, slag 1, microscopic view ? RHI Magnesita

Fig. 5 Cup test—sample 2, slag 1, microscopic view ? RHI Magnesita

Fig. 6 Cup test—sample 3, slag 1, microscopic view. A corroded reaction zone (arrows) resulted in loosened grain structure. ? RHI Magnesita

Fig. 7 Cup test—sample 4, slag 1, microscopic view ? RHI Magnesita

References 8

[1]	Xuguang Jiang, Yanhui Li, Jianhua Yan. Hazardous waste incineration in a rotary kiln: a review. Waste Disposal & Sustainable Energy, 2019, 1(1):3-37.
[2]	Ministry of Ecology and Environment, the People’s Republic of China. 2017—Report on the state of the ecology and environment in China. http://english.mee.gov.cn/Resources/Reports/soe/SOEE2017/201808/P020180801597738742758.pdf.
[3]	T. M. Joudeh. Alternative fuel market after Covid-19—Focus on efficiency and quality. ZKG International, 2020(7- 8):44-49.
[4]	Lloyd G. Bly, Robert J. Pena. Waste incineration—some background and furnace refractory design review. Proceedings of UNITECR 1989, Anaheim, USA, 1989:985-986.
[5]	Christina Stimpfl. Chromium-free special-impregnated bricks for special waste incineration. Proceedings of UNITECR 2019, Yokohama, Japan, 2020:16-B-12.
[6]	R. A. McCauley. Corrosion of Ceramics. 2^nd edition. Marcel Dekker, Inc., 1995:Chapter 1.
[7]	G. Routschka, Taschenbuch. Feuerfeste Werkstoffe. 5^th edition,Vulkan-Verlag Essen, 2011:52.
[8]	D. Zhao. Alumina-silica products for hazardous waste inci-nerators. Proceedings of 5^th Annual Asia Hazardous Waste treatment congress, Jinan, China, 2020.

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