首页|Corrosion behavior of Al2O3-C bricks in MnO-containing mold slag

Corrosion behavior of Al2O3-C bricks in MnO-containing mold slag

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In order to explore the corrosion mechanism of Al2O3-C refractories in the mold flux bearing MnO,the immersion test of Al2O3-C refractories in CaO-SiO2-CaF2-MnO slag with different MnO contents was carried out at 1550 ℃.The results show that Mn particles were observed in the slag after experiment,due to the reduction of MnO by graphite in refractories.Large amounts of graphite were observed at the interface between refractories and slag,indicating that the oxidation of graphite is limited by the poor contact between graphite and molten slag.Therefore,the oxidation of graphite is not the main cause of damage to refractories.A small quantity of CaO·2Al2O3(CA2)and CaO·6Al2O3(CA6)adjacent to Al2O3 grain was detected at the slag/reaction layer interface.CA2 and CA6 possess relatively high melting points,which is beneficial to hindering the further penetration of slag.However,the dissolution of Al2O3 into slag is still the main cause for refractories damage.The increase in the MnO content of mold slag decreases the viscosity and then results in the severe corrosion of Al2O3-C bricks.

Al2O3-C refractoryMnO-containing slagGraphiteCorrosion

Yi-jiang Zhao、Guang-qiang Li、Yang Wu、Cheng Yuan、Ze Meng、Xiao-xuan Deng、Yu Liu

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The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

Research Institute of Technology,Shougang Group Co.,Ltd.,Beijing 100043,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaYoung Elite Scientists Sponsorship Program by CAST

52274305U18602052022QNRC001

2024

10.1007/s42243-023-01056-7

钢铁研究学报(英文版)
钢铁研究总院

钢铁研究学报(英文版)

CSTPCD
影响因子：0.584
ISSN：1006-706X
年,卷(期)：2024.31(6)