Effect of Calcium Aluminate Cement Addition on Properties of Al2O3-SiO2 Based Gunning Mixes

doi:10.19691/j.cnki.1004-4493.2022.03.005

China's Refractories ›› 2022, Vol. 31 ›› Issue (3): 24-27.DOI: 10.19691/j.cnki.1004-4493.2022.03.005

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Effect of Calcium Aluminate Cement Addition on Properties of Al₂O₃-SiO₂ Based Gunning Mixes

ZHOU Junjie, HAN Junhua^*

CISDI Engineering Co., Ltd., Chongqing 400013, ChinaKey words：calcium aluminate cement; gunning mix; calcia-alumina-silica phase diagram; physical properties

Online:2022-07-15 Published:2022-11-07
Contact: ^*e-mail: junhua.han@cisdi.com.cn
About author:Zhou Junjie gained his master’s degree from Metallurgical School of Xi’an University of Architecture and Technology. Currently, he is a senior engineer in CISDI Engineering Co., Ltd., in charge of the purchase and quality control of iron- and steel-making engineering equipment and related refractories.

Abstract

Abstract: Al2O3-SiO2 based gunning mixes were prepared with electric porcelain waste, silica fume, bauxite, quartz powder, and calcium aluminate cement (CAC) of different additions as raw materials firing at different temperatures to research the effect of the CAC addition on their phase change and properties. The results show that: from theoretical analysis of the phase diagram, with the CAC addition increasing from 8% to 14%, anorthite increases from 40.0% to 77.7%, by mass. With the rising CAC addition, the permanent linear change on heating of specimens increases; for the specimens dried at 110 ℃ or hot-treated at 1 000 ℃, the bulk density and the mechanical properties increase, and the apparent porosity decreases; and for those hot-treated at 1 300 ℃, the bulk density and the mechanical properties firstly increase, and then decrease, while the apparent porosity shows an opposite trend. Taking into account the phases at high temperatures and the properties, the optimal CAC addition of Al2O3-SiO2 based gunning mixes is 12%.

Key words: calcium aluminate cement, gunning mix, calcia-alumina-silica phase diagram, physical properties

ZHOU Junjie, HAN Junhua. Effect of Calcium Aluminate Cement Addition on Properties of Al₂O₃-SiO₂ Based Gunning Mixes[J]. China's Refractories, 2022, 31(3): 24-27.

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Effect of Calcium Aluminate Cement Addition on Properties of Al₂O₃-SiO₂ Based Gunning Mixes

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