Center for Abrasives and Refractories Research & Development C.a.r.r.d. Gmbh

Imerys

Sebastian Sachse

Jean Andre Alary

Thomas Parias

Jean-André Alary

Andreas Boerger

Alexander Kral

Andreas BÖRGER

An abrasive grain made from melted spherical corundum where the abrasive grain consists of a spherical corundum core, coated with an encircling layer of a binder and fine-grained abrasive solid particles.

Abrasive grain based on melted spherical corundum

Titanium oxide-containing aluminum oxide particles are based on corundum melted in an electric arc furnace from calcined alumina. The particles may have an aluminum oxide content of less than 97.0% by weight, a titanium oxide content ranging from 1.3% by weight to 1.8% by weight, and a zirconium oxide content of ranging from 0.02% by weight to 0.1% by weight. The aluminum oxide particles may have an arithmetic mean compactness of less than 0.8.

Titanium oxide-containing aluminum oxide particles based on corundum melted in an electric arc furnace from calcined alumina, and a method for the production thereof

The present invention relates to polycrystalline AlObodies based on melted aluminum oxide having a mean crystallite size of the primary crystals between 20 &#x3bc;m and 100 &#x3bc;m and a closed macroporosity between 10% by volume and 30% by volume. The polycrystalline AlObodies may be obtained by tapping out and quenching a liquid aluminum oxide melt and simultaneous seeding of the pouring stream with seed crystals and can be used advantageously for the production of abrasive materials and refractory products.

[object Object]

A method is provided for manufacturing spherical corundum grains having a bulk density between 1.5 kg/L and 2.5 kg/L, with aluminum oxide being melted in an electric arc furnace with the addition of 0.1 to 1% quartz sand, the melt being poured in a pouring quantity of less than 100 kg/min, and the pouring stream being blown using compressed air at a pressure between 3 to 10 bar.

Spherical corundum particles, based on fused aluminum oxide and a method for producing said particles

An embodiment consistent with the present invention is a high strength proppant comprising an electrofused pellet. In another embodiment, a high strength proppant comprises a substantially solid and substantially spherical pellet produced by electrofusion of at least one metal oxide. A method of making a proppant is also provided, with that method comprising melting at least one metal oxide in an electrical arc furnace, pouring the molten metal oxide to create a pour stream, and separating the pour stream to form at least one electrofused pellet. A method of fracturing subterranean formations is also provided, with that method comprising injecting a fluid containing at least one electrofused pellet.

Growing community of inventors

Villach, Austria

Sebastian Sachse