초록 ▼

The invention relates to an alumina based, phosphate bondable, dry refractory mix composition exhibiting an extended shelf life of up to eighteen months and longer. The mixture has the following preferred composition on a weight percentage basis: 40-70% sized tabular alumina, 15-35% calcined alumina

The invention relates to an alumina based, phosphate bondable, dry refractory mix composition exhibiting an extended shelf life of up to eighteen months and longer. The mixture has the following preferred composition on a weight percentage basis: 40-70% sized tabular alumina, 15-35% calcined alumina, 2-10% hydrated alumina, 1-10% calcium aluminate cement and an acid ingredient such as 3 to 15 weight percent of an 115 percent concentration of polyphosphoric acid. The mix is prepared by a method which comprises the steps of formulating 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.

대표청구항 ▼

A single package, dry refractory mix, which exhibits extended shelf life under conventional storage conditions and does not require an inhibitor, which sets upon the addition of water, and which exhibits high abrasion resistance when set, consisting essentially of: (a) 40 to 70 weight percent of an

A single package, dry refractory mix, which exhibits extended shelf life under conventional storage conditions and does not require an inhibitor, which sets upon the addition of water, and which exhibits high abrasion resistance when set, consisting essentially of: (a) 40 to 70 weight percent of an inert refractory aggregate, (b) 15 to 35 weight percent of an aluminous material selected from the group consisting of calcined alumina, calcined bauxite and kaolin calcine, (c) 2 to 10 weight percent hydrated alumina, (d) 1 to 10 weight percent calcium aluminate cement, and (e) 3 to 15 weight percent of 115 percent polyphosphoric acid; prepared by a process comprising the steps of introducing the dry ingredients into a mixer, mixing the dry ingredients, adding the 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, not exceeding four minutes.