Aglutinacao with espinelios phosphate reactive to use as materials refratarios incorporating MgO as the accelerator of the consolidation

摘要

A composition useful particularly as a mortar, coating, castable or ramming mix is disclosed comprising: (1) 5 to 85 percent by weight of at least one reactive magnesium aluminium oxide spinel derived by coprecipitating water soluble magnesium salt(s) and aluminium salt(s) in a proportion to provide from about 0.5 to about 1 magnesium atom per aluminum atom, heating the coprecipitate to between about 700 DEG to about 1650 DEG C to convert it to its oxide form (MgAl2O4) which contains from about 1 to about 25 percent by weight segregated MgO phase intimately dispersed therein; (2) 0 to 80 percent by weight of a substantially non-reactive filler material; (3) 1 to 20 percent by weight of an inorganic phosphate material capable of forming (PO3)-_n moieties on heating at above about 200 DEG C; (4) 4 to 30 percent by weight water; and (5) 0 to 5 percent by weight handling agents.