| 摘要 |
An alumina based, phosphate bondable, dry refractory mix composition, exhibiting an extended shelf life of up to eighteen months and longer, has the following composition on a weight percentage basis: 40-70% of an inert refractory aggregate selected from tabular alumina, calcined bauxite, kaolin calcine and synthetic mullite; 15-35% of an aluminous material selected from calcined alumina, calcined bauxite or kaolin calcine; 2-10% hydrated alumina; 1-10% calcium aluminate cement; and an acid ingredient in an amount providing P2O5 equivalent to that provided by 3 to 19 weight percent of an 85 percent concentration of phosphoric acid. The mix is prepared by formulating the dry ingredients into a mixer, mixing the dry ingredients to a homogenous state, then adding a liquid acid ingredient to the mixture of dry ingredients, and subjecting the dry and acid ingredient mix to a high intensity mixing action for a predetermined period of time. The product is substantially dry to the touch. |
