| Preliminary Investigation on the Application of a Semi-
Lightweight Mullite Spherical Solid Waste Material in Ladle
Permanent Layer |
Lei Peng, Jun Yu,* Huizhong Zhao, Han Zhang and Sun Ziheng
Pages: 287-294
DOI : 10.1080/0371750X.2023.2260848 |
| Abstract |
| The heat dissipation of high alumina castables for ladle permanent layer is a topic
worthy of attention and solution. It is proposed to use spherical porous mullite
(a solid waste) instead of irregular M70 mullite aggregate in castable to reduce the
thermal conductivity and realize a high-strength and lightweight design. The effect of
spherical porous mullite content in castables on thermal conductivity, service strength
and thermal shock resistance were discussed. The results demonstrated that the
substitution amount of spherical porous mullite increased, the bulk densities of the
castables dropped from 2.68 to 2.38 g.cm–3, the apparent porosity rose from 15.5 to
25.0%. The thermal conductivities reduced from 1.174 to 0.585 W.m–1.K–1 (1000oC),
which can be ascribed to the increased porosity extending the heat transfer path.
Furthermore, owing to the high strength of spherical mullite and its excellent bonding
with matrix, the mechanical strength of castable was at a high strength level, with
modulus of rupture of 18 MPa and cold crushing strength of 76 MPa at the spherical
porous mullite completely substituting M70 mullite. The semi-lightweight and low
thermal conductivity castable containing spherical porous mullite show great
application potential in the ladle permanent layer.
[Keywords: Spherical porous mullite, M70 mullite, Ladle, Insulating refractory castables] |
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