We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Preparation of lightweight alumina-silica castables by replacing closed-cell perlite aggregates with coal gangue ceramsites.
- Authors
Zan Wenyu; Ma Beiyue; Wang Yuqing; Jiang Zhifeng; Naihuo Cailiao
- Abstract
Lightweight alumina-silica castables were prepared using closed-cell perlite (2-4 mm),open- cell perlite (4-6 mm) and coal gangue ceramsites (≤5 mm) as aggregates, floating beads (0.3 -0.5 mm),sinking beads (0.6 -0.8 mm),silica micropowder, α-Al2O3 micropowder, zirconia and zircon micropowder as fines, and Secar 71 (calcium aluminate cement) cement as the binder. The effects of the coal gangue ceramsites addition (0,6%,12%,18% and 24%,by mass) on the properties of the as-prepared lightweight alumina-silica castables were investigated. The results show that:(1)the addition of coal gangue ceramsites can reduce the sintering shrinkage of the specimens and help) to improve the strength and thermal shock resistance; (2)the specimens with the addition of coal gangue ceramsites can produce pores in the matrix of the sintered specimens, which provides enough space for the growth of CA6 complex solid solution and expands the irregular lamellar structure; (3) with the addition of coal gangue ceramsites increasing, the linear shrinkage of the specimens sintered at 1 000 or 1 200 °C firstly reduces and then increases, the bulk density increases and the apparent porosity decreases; the cold compression strength and the thermal shock resistance of the specimens sintered at 1 200 °C firstly increase and then decrease. Thus, the optimal addition of coal gangue ceramsites is 18%.
- Subjects
PERLITE; COAL; THERMAL shock; CALCIUM aluminate; THERMAL resistance; SILICA fume
- Publication
Refractories / Naihuo Cailiao, 2022, Vol 56, Issue 5, p391
- ISSN
1001-1935
- Publication type
Article
- DOI
10.3969/j.issn.1001-1935.2022.05.005