Patent ID: 7762475

Claim:
A method for spray application of a monolithic refractory material, including providing a primary water injector arranged in a spray-material feed pipe extending from a spray-material supply device to a distal spray nozzle, and a secondary water injector arranged in said spray-material feed pipe at a position adjacent to said distal spray nozzle, and injecting application water from each of said primary and secondary water injectors into a spray material which is being fed through said spray-material feed pipe, said method comprising: arranging said primary water injector on an upstream side of said secondary water injector with a given distance therebetween; adding 10 to 50 mass % of application water on the basis of the total mass % of application water required for said spray application from said primary water injector; and adding the remaining mass % of application water from said secondary water injector, wherein said application water added from said primary water injector is injected together with compressed air in the form of water particles having an average particle size of 100 μm or less; and wherein said spray material is a cold/hot spray material to be applied in a cold or hot temperature, said cold/hot spray material comprising a mixture prepared by adding a binder which is either one selected from the group consisting of alumina cement, magnesia cement, phosphate and silicate, an accelerator, a dispersant and a fiber to a refractory raw material powder, said refractory raw material powder including 25 to 60 mass % of particles having a particle size of less than 75 μm, wherein a mass ratio of a first group of said particles having a particle size of less than 10 μm to a second group of said particles having a particle size of 10 μm to less than 75 μm is in the range of 0.25 to 0.7.