Application of Magnesia-Phosphate Cement for Chromia/Alumina Castables

2012 ◽  
Vol 268-270 ◽  
pp. 625-628
Author(s):  
Jing Ming Zhao ◽  
Kyu Hong Hwang ◽  
Jong Kook Lee ◽  
Min Cheal Kim
Keyword(s):  
Calcium Aluminate ◽  
Calcium Aluminate Cement ◽  
Furnace Lining ◽  
Iron And Steel ◽  
Good Corrosion Resistance ◽  
Refractory Castables ◽  
And Performance ◽  
The Relationship ◽  
Aluminate Cement ◽  
Alumina Castables

Refractory castables containing calcium aluminate cement (CAC) are widely used in a range of furnace lining applications in the iron and steel, cement, glass, ceramic, and petrochemical industries. However, magnesia-phosphate cement (MPC) based material could be a new types of cement material, with many advantages such as rapid hydration, high early strength and circumstance suitability, which has very important value and wide application. In this study, MPC was used at Chromia/Alumina castable as binder addition instead of conventional calcium aluminate cement. Meanwhile, it also explains the relationship between the micro-mechanism and performance by micro methods such as SEM. The results shows that MPC based castables have good corrosion resistance, interface adhesiveness and abrasion resistance.

One-step synthesis of in-situ carbon-containing calcium aluminate cement as binders for refractory castables

2018 ◽  
Vol 44 (13) ◽  
pp. 15378-15384 ◽  
Author(s):  
Guoqing Xiao ◽  
Shoulei Yang ◽  
Donghai Ding ◽  
Yun Ren ◽  
Lihua Lv ◽  
...  
Keyword(s):  
Calcium Aluminate ◽  
Calcium Aluminate Cement ◽  
Refractory Castables ◽  
One Step ◽  
Aluminate Cement

Calcium aluminate cement source evaluation for Al2O3–MgO refractory castables

2011 ◽  
Vol 37 (1) ◽  
pp. 215-221 ◽  
Author(s):  
M.A.L. Braulio ◽  
G.G. Morbioli ◽  
D.H. Milanez ◽  
V.C. Pandolfelli
Keyword(s):  
Calcium Aluminate ◽  
Calcium Aluminate Cement ◽  
Source Evaluation ◽  
Refractory Castables ◽  
Aluminate Cement

Investigations on the properties of Al2O3–MgO refractory castables bonded by in situ carbon containing calcium aluminate cement

2018 ◽  
Vol 5 (9) ◽  
pp. 095205 ◽  
Author(s):  
Donghai Ding ◽  
Shoulei Yang ◽  
Guoqing Xiao ◽  
Yun Ren ◽  
Lihua Lv ◽  
...  
Keyword(s):  
Calcium Aluminate ◽  
Calcium Aluminate Cement ◽  
Refractory Castables ◽  
Aluminate Cement

Effect of Micro-Sized Alumina Powder on the Hydration Process of Calcium Aluminate Cement

2018 ◽  
Vol 281 ◽  
pp. 249-254
Author(s):  
Zhong Feng Xia ◽  
Zhou Fu Wang ◽  
Xi Tang Wang ◽  
Hao Liu ◽  
Yan Ma
Keyword(s):  
Calcium Aluminate ◽  
Cement Hydration ◽  
Calcium Aluminate Cement ◽  
Hydration Heat ◽  
High Alumina ◽  
Alumina Powder ◽  
Hydration Products ◽  
Refractory Castables ◽  
Alumina Refractory ◽  
Aluminate Cement

Micro-sized alumina powder is widely used in low cement high-alumina refractory castables. The hydration of calcium aluminate cement can be affected by adding micro-sized alumina powder. This work addresses the hydration of a commercial cement at 25°C with 50 wt% micro-sized alumina powder added. The hydration heat was measured by isothermal micro-calorimetry. The phase composition and microstructure of the hydration products at the designated times were studied by XRD and SEM, respectively. The results showed that micro-sized alumina powder accelerated the dissolution of CAC. The induction period of the cement hydration reduced from 13h to 4.5h, and the hydration heat within 50hs was increased from 469J/g to 587J/g with the addition of micro-sized alumina powder. The morphology of the hydrates was flocculent amorphous at the beginning, and then transformed to short rods or cubic shape with micro-sized alumina powder added.

Rheological Behaviors of Calcium Aluminate Cement-Hydratable Alumina Bonded Corundum-Spinel Castables Suspensions with Different Dispersants

2018 ◽  
Vol 281 ◽  
pp. 137-143
Author(s):  
Man Fei Cai ◽  
Yong He Liang ◽  
Yu Cheng Yin ◽  
Jian Hua Nie ◽  
Yu Long Guo
Keyword(s):  
Shear Rate ◽  
Calcium Aluminate ◽  
Sodium Tripolyphosphate ◽  
Mixing Time ◽  
Calcium Aluminate Cement ◽  
Rheological Behaviors ◽  
Refractory Castables ◽  
Aluminate Cement ◽  
Hydratable Alumina ◽  
Rheological Performance

Calcium aluminate cement (CAC) and hydratable alumina (HA) are the most widely used binders for refractory castables. Nevertheless, CAC as the binder for refractory castable generates some low melting point phases when coupled with SiO2, which deteriorate the high temperature performance of refractory castables. Although hydratable alumina (HA) bonded castables overcome the drawbacks of CAC bonded ones, they demand a longer mixing time and higher water contents due to HA's high specific surface area, as well as increasing the shear stress and viscosity of HA bonded castables. Therefore, in this paper, CAC combined with HA was used as the binder for corundum- spinel castables to obtain better performance. Sodium tripolyphosphate (STPP), dispersing alumina (ADS) and polycarboxylate ether dispersant (FS60) were used as dispersants, and their effects on the rheological behaviors of CAC-HA bonded corundum-spinel castables suspensions had been investigated. According to the viscosity-shear rate and stress-shear rate curves of suspensions with different dispersants, it was suggested that STPP, ADS, FS60 were all helpful for rheological performance of suspensions. Suspensions achieved much better rheological behavior with 0.3 wt.% of STPP, 1.0wt.% of ADS and 0.1wt.% of FS60, respectively. Suspensions with ADS and FS60 presented to be pseudo plastic fluid, which was helpful for the installation process of CAC-HA bonded corundum-spinel castables. And FS60 could simultaneously impart electrostatic and steric stabilization to the given suspension. Considering the actual rheological performance of CAC-HA bonded corundum-spinel castables, FS60 was much better than ADS.

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