| 摘要 |
1. Refractory dry ramming mix for lining crucible induction furnaces consisting of Al2 O3 in the form of fused corundum or sintered alumina as the principal material and having an additive containing MgO which on heating reacts with the Al2 O3 principal material thereby forming a spinel, characterised in that the mix contains a pre-reacted magnesia-chromite sinter material as the spinel forming additive in an amount of from 5 to 50 wt. % and that the mix has a grain size of up to 5 mm and contains a fine fraction having a grain size of up to 0,1 mm in an amount of from 10 to 35 wt. %, this fine fraction consisting of the Al2 O3 principal material or of the pre-reacted magnesia-chromite sinter material or of a mixture of these two materials. |
