High Temperature Interactions of Chrome Oxide Free Refractories with Coal Slag Under Simulated Gasification Conditions

doi:10.19691/j.cnki.1004-4493.2020.02.001

China's Refractories ›› 2020, Vol. 29 ›› Issue (2): 1-5.DOI: 10.19691/j.cnki.1004-4493.2020.02.001

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High Temperature Interactions of Chrome Oxide Free Refractories with Coal Slag Under Simulated Gasification Conditions

ZHAO Shixian^*(), LI Hongxia, SUN Honggang, CAI Binli, WANG Lan, KANG Yina

Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China

Revised:2021-05-13 Online:2020-06-15 Published:2020-06-15
Contact: ZHAO Shixian
About author:Zhao Shixian, born in 1981, obtained his bachelor's degree and Ph. D in material science from Gansu University of Technology in 2004 and Beijing University of Technology in 2010, respectively. Now he is working in Sinosteel Luoyang Institute of Refractories Research Co., Ltd. and researching on experimental and thermodynamic evaluation of stability and corrosion of refractory materials in metals and molten slags.

Abstract

Abstract:

Chrome oxide free refractories have significant economic benefits for the development of gasification technology. Spinel based and SiC based refractories are corroded by coal slag at 1 500 ℃ under reducing atmosphere. Moreover, interactions between refractory materials and molten slag are also predicted by thermodynamic calculations under the same conditions. The results indicate that spinel based refractories are corroded by dissolution of molten slag, while SiC based refractories are corroded by oxidation of CO and FeO. Both of the spinel and SiC based refractories show good corrosion resistance against coal slag by the present experimental tests. Finally, preliminary developed spinel-SiC composite materials are prepared and corroded by coal slag as well, the research of which shows great potential to be used in slagging gasifiers.

Key words: chrome oxide free refractories, corrosion, gasification, thermodynamic calculation

ZHAO Shixian, LI Hongxia, SUN Honggang, CAI Binli, WANG Lan, KANG Yina. High Temperature Interactions of Chrome Oxide Free Refractories with Coal Slag Under Simulated Gasification Conditions[J]. China's Refractories, 2020, 29(2): 1-5.

Figures/Tables 8

Fig.1 Microstructure of corroded MgO-Al2O3-ZrO2 brick

Fig. 2 Thermodynamic calculated results after reaction of MgO-Al2O3-ZrO2 brick with coal slag: (a) main phases, (b) composition in spinel and MeO solid solution (R=refractory/(refractory+slag))

Fig. 3 Microstructure and XRD analysis of corroded Si3N4-SiC bricks

Fig. 4 Thermodynamic calculated results of SiC and Si3N4 under simulated atmosphere: (a) SiC, (b) Si3N4 (R=refractory/(refractory+slag))

Fig. 5 Thermodynamic calculated results of interactions of SiC and Si3N4 with molten slag: (a) SiC, (b) Si3N4 (R=refractory/(refractory+slag))

Table 1 Properties of in-situ spinel bonded and Mg-SiAlON bonded spinel-SiC materials

Sample	BD /(g · cm^-3)	AP /%	CMOR /MPa
Spinel-SiC	2.72	18.3	7.1
In-situ spinel bonded	2.73	16.9	10.9
Mg-SiAlON bonded	2.58	20.0	17.0

Fig. 6 Corrosion depth of developed materials as well as high chrome oxide refractories

Fig. 7 SEM observation of corroded spinel-SiC materials: (a) in-situ spinel bonded and (b) Mg-SiAlON bonded

References 10

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High Temperature Interactions of Chrome Oxide Free Refractories with Coal Slag Under Simulated Gasification Conditions

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