Slag Resistance Mechanism of SiC-CA6 Composites: New Exploration of Chrome-free Refractories for Coal Gasification
SUN Honggang1,2, SI Yaochen2, XIA Miao2, LI Hongxia1,2,*, ZHAO Shixian2, DU Yihao2, SHANG Xinlian2
1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, Henan, China
Abstract: High chromium refractory has been used as the lining of coal water slurry gasifier for a long time because of its excellent corrosion resistance. It has been a problem for many years to replace it with chrome free refractories. Silicon carbide and calcium hexaaluminate composite refractories (SiC-CA6, SCA) were prepared by pressing and burning the mixture of silicon carbide particles and calcium hexaaluminate powders. The slag resistance tests with gasifier slag for high chromium refractory and SCA were carried out at 1 500 ℃ by crucible method and rotary slag resis-tance method, respectively. The erosion depth and penetration depth of the samples after slag tests were measured,and cracks were observed. The chemical compositions, phase compositions and microstructure of refractories and slags before and after slag tests were analyzed by SEM, EDS and XRD. The slag corrosion behavior and slag resistance mechanism of the new chrome-free refractory were explored. The results show that SCA has better slag penetration resistance and thermal shock resistance than high chromium refractory. The corrosion of SCA with slag is very weak because their reaction is only in the contact area. Once the slag infiltrates from the refractory surface, a kind of glass phase with high viscosity, whose components are mainly Al2O3, SiO2 and CaO, will be formed by the reaction of slag and refractory at the interface. And then the glass phase fills the pores and makes the dense microstructure. A shield with the similar chemical composition of slag is formed at the interface between slag and SCA, which effectively prevents the erosion and penetration of slag. SCA has the potential to be used in coal water slurry gasi-fier because of its excellent comprehensive properties.
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2022, Vol. 36 
