Abstract: A method of making a proppant may include providing a feed material, extruding the feed material through a nozzle of a rotating body to form a green body, the nozzle being positioned between a plurality of projections and passing from an exterior of the rotating body to a core of the rotating body, and sintering the green body to form the proppant. The method may include drying the green body prior to the sintering. The extruding may be performed using a gear pelletizer. An feed material composition may include a ceramic precursor, a binder, a lubricant, and water. The ceramic precursor may include bauxite. The ceramic precursor may include bauxite and calcium carbonate. The binder may include sodium lignosulfonate. The lubricant may include aluminum stearate, zinc stearate, or oleic acid. The sintered proppants may have a density greater than or equal to about 3.7 g/cm3.

Abstract: The present invention relates to temperature-treated polycrystalline porous Al2O3 bodies comprising an amount of ? aluminum oxide of more than 97% by weight, an amount of other oxide alloying components of a total of less than 3% by weight, a macroporosity of between 5 and 30% by volume, wherein the Al2O3 bodies are composed of a plurality of Al2O3 primary crystals comprising a crystallite size of between 20 and 100 ?m.

Abstract: The present invention relates to temperature-treated polycrystalline porous Al2O3 bodies comprising an amount of ? aluminum oxide of more than 97% by weight, an amount of other oxide alloying components of a total of less than 3% by weight, a macroporosity of between 5 and 30% by volume, wherein the Al2O3 bodies are composed of a plurality of Al2O3 primary crystals comprising a crystallite size of between 20 and 100 ?m.