High-alumina refractory castables with calcium aluminate binder

1989 ◽  
Vol 8 (4) ◽  
pp. 424-426 ◽  
Author(s):  
V. K. Singh
Keyword(s):  
Calcium Aluminate ◽  
High Alumina ◽  
Refractory Castables ◽  
Alumina Refractory

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.

scholarly journals High alumina refractory concretes bonded with calcium aluminate phosphate binder

2020 ◽  
Vol 120 ◽  
pp. 91-97
Author(s):  
A. O. Nagorniy
Keyword(s):  
Calcium Aluminate ◽  
Strength Properties ◽  
Structure Design ◽  
High Alumina ◽  
Phosphate Binders ◽  
Construction Costs ◽  
Interphase Interaction ◽  
Initial Strength ◽  
Heating And Cooling ◽  
Alumina Refractory

For many industries, further progress is possible provided that more efficient refractories of new types are created. The refractory concretes bonded by calcium aluminate phosphate binders in comparison with conventional refractories continue to gain in popularity because of the following advantages: quick installation and low construction costs; reduced and simplified furnace maintenance; good thermal-shock resistance; monolithic (no joints); linings of the units done need not be cured to develop initial strength. The longevity of refractory is essentially increasing provided structure is forming under conditions of the service site. That is why developing of new refractory materials must be carried out by means of its structure design. These principles have been realizing in the refractory concretes technology under the limited conditions of refractory lining installation and industrial unit final heat up. The present paper identifies the phosphate phases responsible for developing mechanical-strength properties of high alumina concretes bonded with calcium aluminate phosphate binders. It sets out the colloid and crystalline phases resulted from interphase interaction that provides the basis for calcium aluminate phosphate binders (suspensions) useful to the refractory industry. The concretes obtained retain their volume integrity after 30 cycles of heating and cooling; can be used for refractory applications > 1700 °С; exhibit sufficient strength of lining 40 MPa.

scholarly journals Binder effect on ZnAl2O4-containing high-alumina refractory castables

2022 ◽  
Author(s):  
V.S. Pinto ◽  
A.P. Luz ◽  
O.H. Borges ◽  
V.C. Pandolfelli
Keyword(s):  
High Alumina ◽  
Refractory Castables ◽  
Alumina Refractory

Self-reinforced high-alumina refractory castables

2018 ◽  
Vol 44 (2) ◽  
pp. 2364-2375 ◽  
Author(s):  
A.P. Luz ◽  
A.H.G. Gabriel ◽  
L.B. Consoni ◽  
C.G. Aneziris ◽  
V.C. Pandolfelli
Keyword(s):  
High Alumina ◽  
Refractory Castables ◽  
Alumina Refractory

Permeability of High-Alumina Refractory Castables Based on Various Hydraulic Binders

2002 ◽  
Vol 85 (6) ◽  
pp. 1517-1521 ◽  
Author(s):  
Murilo D. M. Innocentini ◽  
Arturo R. F. Pardo ◽  
Victor C. Pandolfelli ◽  
Bruno A. Menegazzo ◽  
Luis R. M. Bittencourt ◽  
...  
Keyword(s):  
High Alumina ◽  
Refractory Castables ◽  
Alumina Refractory
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