High alumina refractory cement and a process for producing the same
AssigneeLafarge Fondu International
InventorAlain Mathieu
Life of this patent
Estimating the term…
Abstract
This invention concerns a high-alumina refractory cement, which contains, in addition to ingredients adapted to form a hydraulic bond, and standard secondary ingredients, one or more ingredients adapted to form a phosphatic chemical bond. The invention concerns a high-alumina refractory cement and the process used to prepare it.
Claims22
A high-alumina refractory cement, consisting essentially of alumina ingredients for forming a hydraulic bond and one or more ingredients for forming a phosphatic chemical bond, said ingredients for forming the hydraulic bond comprising aluminous clinker having a Blaine specific surface area of 3000 to 5000 cm.sup.2 /g and said ingredients for forming a phosphatic chemical bond consisting of 0.5 to 5% by weight in relation to the weight of high-alumina cement of at least one water soluble alkaline phosphate expressed as P.sub.2 O.sub.5.
A process for making a high-alumina refractory cement, consisting essentially of ingredients for forming a hydraulic bond and one or more ingredients for forming a phosphatic chemical bond consisting of 0.5 to 5% by weight in relation to the weight of high-alumina cement of at least one water soluble alkaline phosphate expressed as P.sub.2 O.sub.5, said process comprising grinding together cement clinker and calcined alumina to a Blaine specific surface area of 3,000 to 5,000 cm.sup.2 /g, and mixing in the phosphatic ingredient after grinding.
A process for making high-alumina fire resistant cement consisting essentially of ingredients for forming a hydraulic bond and one or more ingredients for forming a phosphatic chemical bond consisting of 0.5 to 5% by weight in relation to the weight of high-alumina cement of at least one water soluble alkaline phosphate expressed as P.sub.2 O.sub.5, said process comprising mixing together a clinker ground to a Blaine specific surface area of 3000 to 5000 cm.sup.2 /g, previously ground alumina, and the phosphatic ingredient.
Dependencies are inferred from the claim text.