An alumina-based filling sand for sliding nozzle comprising at least 50 wt % of mixed sand including 20 to 90 vol % of alumina sand and 80 to 10 vol % of silica sand, wherein the alumina sand has surface irregularities of 1.3 or less and comprises 50 wt % or more of an Al.sub.2O.sub.3 component.

A device and method of reclaiming refractory material from a lining of a refractory includes assembling a first refractory component of the lining with a first refractory product, and assembling a second refractory component of the working lining with a second refractory product different from the first refractory product, the second refractory product including magnetic material dispersed therein. Upon the lining reaching a service life, the lining is demolished to produce a mixture of the first refractory component pieces and the second refractory component pieces. Magnetic separation is performed on the mixture to separate the second refractory component pieces from the first refractory component pieces.

A method includes forming an article from a silicon-rich refractory mixture. The silicon-rich refractory mixture includes a silicon-rich silicon carbide preceramic polymer and a silicon carbide powder. The method includes heating the preform to pyrolyze the silicon-rich silicon carbide preceramic polymer and form a silicon-rich refractory material. The silicon-rich refractory material includes the silicon carbide powder and excess silicon in a silicon carbide matrix. The method further includes heating the silicon-rich refractory material to oxidize at least a portion of the excess silicon and form a reinforced refractory material. The reinforced refractory material includes a silicon dioxide phase at grain boundaries of the silicon carbide powder.

Provided are a silica ceramic material, a ceramic foam filter, and a preparation method and use of the ceramic foam filter. The silica ceramic material includes a ceramic powder and an auxiliary material, where the ceramic powder includes the following components by mass percentage: 40% to 80% of silica, 8% to 30% of alumina, and 8% to 30% of silicon carbide; and the auxiliary material includes a binder and a dispersing agent: a mass of the binder accounts for 1% to 5% of a mass of the ceramic powder, and a mass of the dispersing agent accounts for 0.5% to 1% of the mass of the ceramic powder.

The invention relates to a refractory ceramic batch for the production of an unformed refractory ceramic batch, the use of a batch of this kind for lining metallurgical melting vessels and also a metallurgical melting vessel which is lined with an unformed refractory ceramic product based on a batch of this kind.

A castable refractory material for use in the manufacture of refractory products including fused silica, ceramic fibre, microsilica and a bonding material comprising colloidal silica.

A refractory, which is particularly suitable for use in an inner lining of a blast furnace, is obtainable by a process. The process includes providing a mixture containing coke, silicon and a binder. A green block is formed from the mixture. The green block is then baked. The baked block is semi-graphitized at a temperature between 1600 and 2000 C.

In some examples, a method for making a refractory component includes depositing carbon on a surface of a refractory substrate. The carbon fills surface voids on the surface of the refractory substrate. A melting point of the refractory substrate is greater than or equal to about 1500 degrees Celsius ( C.). The method includes applying a metal slurry to a surface of the refractory substrate following the deposition of the carbon and reacting a metal of the metal slurry with the carbon to form a metal carbide phase within the surface voids of the refractory substrate.

The disclosure concerns printable refractory compositions, more particularly ceramic-based pastes for 3D printing of molds for additive metal casting. In particular, the present disclosure concerns composition for forming mold regions having controlled thermal conductivity and dissipation and controlled release of gaseous products therefrom during heating to mitigate mechanical failure risks in an additive casting process of metal objects.

A refractory product contains a free carbon component of 10-30% by mass, and the remainder in which: a main mineral phase includes one or more of corundum, spinel, and periclase, with periclase content less than 40% by mass; and total content of a silica component and a silicon carbide component less than 15% by mass. When the remainder is defined as 100% by volume, refractory particles having particle size of: greater than 0.3 mm account for 20% by volume or more, and 0.045 mm or less account for 3-30% by volume, with a substantially continuous void layer present around each of a plurality of coarse particles at least one of which has the largest particle size among refractory particles in the refractory product. The refractory product has an apparent porosity of 16% or less, and a maximum thermal expansion rate at a temperature up to 1500 C. is 0.6% or less.