Refractory chrome-magnesia bricks and compositions made from granular fused material
AssigneeOsterreichisch-Amerikanische Magnesit Aktiengesellschaft
InventorGunther L. Mortl
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Abstract
Refractory chrome-magnesia bricks and compositions composed of a granular fused material having a grain size of 12 mm or less, and a content of from 71 to 83 wt. % Cr.sub.2 O.sub.3 and from 17 to 29 wt. % MgO, the minimum content of Cr.sub.2 O.sub.3 and MgO being 94 wt. %.
Claims9
Refractory chrome-magnesite bricks and compositions composed of a granular fused material having a grain size of 12 mm or less, and a content of from 71 to 83 wt.% Cr.sub.2 O.sub.3 and from 17 to 29 wt.% MgO, the minimum content of Cr.sub.2 O.sub.3 and MgO being 94 wt.%, wherein said granular fused material includes a coarse grain fraction of at most 12 mm and a fine grain fraction of at most 0.2 mm, said fine grain fraction comprising from 30 to 42 wt.% of said granular fused material.
A process for the production of refractory chrome-magnesia bricks and compositions comprising:
- fusing green chromium oxide or substances yielding Cr.sub.2 O.sub.3 with magnesia or a material yielding MgO on melting to form a fused material composed of 71 to 83 wt.% Cr.sub.2 O.sub.3 and 17 to 29 wt.% MgO, the minimum content of Cr.sub.2 O.sub.3 and MgO being 94 wt.%;
- and crushing said fused material to form a granular fused material having a grain size of 12 mm or less, wherein said granular fused material includes a coarse grain fraction of at most 12 mm and a fine grain fraction of at most 0.2 mm, said fine grain fraction comprising from 30 to 42 wt.% of said granular fused material.
A granular fused refractory material having a high resistance to acid slags, said material consisting essentially of from 71 to 83 wt.% Cr.sub.2 O.sub.3 and from 17 to 29 wt.% MgO, said material containing at least 94% Cr.sub.2 O.sub.3 and MgO, said material having a grain size of 12 mm or less and including a fine grain fraction of at most 0.2 mm granular size, said fine grain fraction comprising from 30 to 42 wt.% of said granular fused material.
A process for making a chrome-magnesia refractory product, comprising the steps of:
- (a) melting a first material yielding Cr.sub.2 O.sub.3 with a second material yielding MgO to form a fused mixture, said fused mixture consisting essentially of 71 to 83 wt.% Cr.sub.2 O.sub.3 and 17 to 29 wt.% MgO, the minimum content of Cr.sub.2 O.sub.3 and MgO being 94 wt.%;
- (b) crushing said fused mixture to form a granular fused mixture having a grain size of 12 mm or less and including a fine grain fraction of at most 0.2 mm granular size, said fine grain fraction comprising from 30 to 42 wt.% of said granular fused material;
- and
- (c) forming said crushed granular fused mixture into said refractory product.
Dependencies are inferred from the claim text.