Abstract: The method for wet-gunning a castable refractory composition includes the steps of (a) preparing a cement-free, castable refractory composition comprising 70-98 weight % of refractory aggregate having a particle size of 10 mm or less, 2-30 weight % of ultrafine refractory powder having a particle size of 10 .mu.m or less, and 0.01-1.0 weight % (outer percentage) of a dispersing agent, and further a thickener (in the case of factory premixing); (b) premixing the cement-free, castable refractory composition with water in situ or in a factory to provide an in-situ premixed or factory-premixed, water-containing refractory material having a castable fluidity; (c) conveying the in-situ premixed or factory-premixed, water-containing refractory material to a gunning nozzle by a pump; (d) adding 0.

Abstract: This invention relates to monolithic castable refractory compositions for lining various smelting furnaces and other industrial furnaces, molten metal containers and the like, and to the preparation of such compositions and the products obtained from them. These compositions comprise the following ingredients:______________________________________ refractory clay: 3 - 12% by weight metallic aluminum powder 0.1 - 5.0% by weight (purity = 90% or higher; particle size = 0.074 mm or less for 50% or more by weight of the aluminum powder): deflocculating agent: 0.01-1.0% by weight coagulant: 1-8% by weight reaction inhibitor for to be added optionally aluminum powder: in a quantity from 0.0 to 0.