Inhibited Cr(VI) formation in Cr2O3-containing refractory castable using reactive MgO as hydraulic binder

Le, Guo; Song, Shengqiang; Mu, Yuandong; Ye, Guotian; Chen, Liugang

doi:10.1016/j.jeurceramsoc.2022.09.003

Cited by 9 publications

(26 citation statements)

References 31 publications

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“…Castables after drying exhibited higher AP but lower BD compared with those after curing, mainly because of the evaporation of free water during drying 33 . The AP of castables first decreased from 13.22% to 12.13% by increasing q from 0.22 to 0.24, and the decreased to 11.67% by further increasing the q value to 0.32.…”

Section: Resultsmentioning

confidence: 96%

“…Figure 6 shows the AP and BD of castables after firing at 1600°C. The heat‐treated castables exhibited higher AP but lower BD compared with dried samples, because of the decomposition of Mg(OH) 2 and in situ MgAl 2 O 4 spinel with volume expansion 33,36 . After firing at 1600°C, the AP of castables first decreased from 20.86% to by increasing q from 0.22 to 0.24, then slightly increased to 20.68% by further increasing the q value to 0.32.…”

Section: Resultsmentioning

confidence: 99%

“…However, it could not straightforward analogize the conclusion from CAC‐bonded to RM‐bonded castables because of the differences in volume expansion of in situ products 29 . CaO·2Al 2 O 3 (CA 2 ) and CaO·6Al 2 O 3 (CA 6 ) accompanied with 13.6% and 3.0% volume expansion, respectively, are generated in CAC‐bonded castbales, 14,35 whereas MgAl 2 O 4 (MA) with 8.4% volume expansion formed in RM‐bonded castables 1,33 . These differences would consequently result in varied thermal‐mechanical properties of CAC‐ and RM‐bonded castables 29 .…”

Section: Introductionmentioning

confidence: 98%

“…More recently, reactive MgO (RM) is considered as hydraulic binder to prepare castables with superior properties and performance 6,13,27,29,30 . This is because (1) the slag corrosion and infiltration resistance of castables could be improved due to the in‐situ formed MgAl 2 O 4 spinel, 5 (2) and low energy consumption and CO 2 emission during RM preparation 31,32 . To evaluate the feasibility of RM‐bonded castables in industrial application, numerous researches have been carried out 6,13,27,29,30 .…”

Section: Introductionmentioning

confidence: 99%

“…found that Cr(VI) formation can be effectively suppressed in RM‐bonded Cr 2 O 3 ‐bearing castables compared with calcium aluminate cement (CAC)‐bonded samples. In these work, RM‐bonded castables with a q ‐value of 0.26 were prepared and studied 6,13,27,29,30,33 . Zou et al., 34 however, have figured out that properties of CAC‐bonded castables could be affected by the particle gradation.…”

Section: Introductionmentioning

confidence: 99%

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Particle grading effect on properties of reactive MgO‐bonded castables

Zhang,

Zhao,

Xiao

et al. 2023

Int J Applied Ceramic Tech

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Refractory matrix is a key factor in determining the properties and performance, and thus the lifetime of refractory materials. The particle gradation affected both the matrix composition and microstructure. In this study, six particle gradations of high‐alumina castables were prepared based on Andreasen's model (q = 0.22, 0.24, 0.26, 0.28, 0.30 and 0.32). The influence of particle gradation on properties of high‐alumina castables bonded with 4.0 wt% reactive MgO (RM) was investigated with respect to the difference in matrix composition and microstructure. The results show that castables with q values of 0.24 and 0.26 exhibited better physical and mechanical properties after curing and drying. The castables with a q value of 0.22 showed the best volume stability after firing at 1600°C, whereas, castables with a q value of 0.24 exhibited the highest mechanical strength, and residual CMOR ratio after thermal shock testing. Based on the property analyses of castables, the optimal q value of RM‐bonded castables would be around 0.24.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%