The subject of the present invention is a method for processing metallized packaging materials, especially beverage cartons, or blister packaging. According to the invention, the aluminum is dissolved with the aid of acid and separated from the plastic. The metal-containing acid solution then undergoes pyrohydrolytic treatment and the acid is thus recovered. The aluminum can be recovered as valuable aluminum oxide.

A method of manufacturing high-density beads of high-purity alumina, in which general aluminum hydroxide is dissolved in a sodium hydroxide solution. Insoluble impurities are removed to thus manufacture a pure sodium aluminate solution. High-purity aluminum hydroxide is manufactured. The manufactured high-purity aluminum hydroxide is subjected to a hydrothermal reaction, thus removing both crystal water and sodium. Sulfuric acid and ammonia are not used, raw material powder uncontaminated with impurities is manufactured by performing atomization using pulverizing media, and the powder as a raw material and ultrapure water are used to manufacture seeds. While the atomized powder and the ultrapure water are put onto a rotating plate, steps are performed until a desired size is obtained, thus manufacturing highly densified beads. A sintering process is performed in order to maintain a molding shape and to increase a density, followed by a classification process.

A composition of chlorine-free poly-oxygenated aluminum hydroxide that comprises a clathrate containing oxygen gas molecules. In one embodiment, the poly-oxygenated aluminum hydroxide has particles having a diameter of 212 microns or less. The composition may be homogeneous.

A process for producing metastable nanocrystalline alpha-alumina (-Al.sub.2O.sub.3) having particle sizes smaller than 12 nm. Starting crystallites of -Al.sub.2O.sub.3 having a particle size larger than 12 nm, typically on the order of about 50 nm, are ball-milled at low temperatures to produce a nanocrystalline -Al.sub.2O.sub.3 powder having a particle size of less than 12 nm, i.e., below the theoretical room temperature thermodynamic size limit at which -Al.sub.2O.sub.3 changes phase to -Al.sub.2O.sub.3, wherein the powder remains in the -Al.sub.2O.sub.3 phase at all times.

A composition of chlorine-free poly-oxygenated aluminum hydroxide that comprises a clathrate containing oxygen gas molecules and a nutraceutical. In one embodiment, the poly-oxygenated aluminum hydroxide has particles having a diameter of 212 m or less. The nutraceutical may include one or more of a protein, vitamin, fiber, mineral and electrolytes. The composition may be in a powder or fluid form.

The present invention relates to aluminium trihydroxide compositions. The present invention also relates to methods of forming aluminium trihydroxide compositions.

Disclosed is an alumina slurry substantially including alpha-alumina particles and water, wherein the alpha-alumina particles satisfy all particle diameter distribution conditions (a) to (d) mentioned below, the alpha-alumina particles have an alumina purity of 90% by weight or more, the content of alumina in the slurry is 20% by weight or more and 50% by weight or less, and the slurry has a viscosity of 0.5 Pa.Math.s or more and 15 Pa.Math.s or less: condition (a): the average particle diameter is 1 m or less, condition (b): particles having a particle diameter of less than 0.2 m account for 7% by weight or less, condition (c): particles having a particle diameter of more than 1.5 m account for 15% by weight or less, and condition (d): one or more frequency maximums exist in a particle diameter range of 0.1 m or more and less than 0.5 m.

A method comprising (a) reacting aluminum metal with an acid in the presence of water to provide a first aluminum salt solution comprising an aluminum salt in water, wherein the aluminum salt comprises a reaction product of the acid and the aluminum metal, (b) heating the first aluminum salt solution to provide a mother liquor and solid aluminum salt, (c) optionally, separating the solid aluminum salt from the mother liquor, (d) optionally, dissolving at least a portion of the separated solid aluminum salt with water to provide a second aluminum salt solution, (e) spray roasting the first, or second (if produced), aluminum salt solution to provide an aluminum oxide powder, and (f) washing the aluminum oxide powder, wherein the washed aluminum oxide powder comprises less than about 30 ppmw total metallic and alkyl impurities.

A coated abrasive article having a substrate, a bond material overlying the substrate, and a layer of abrasive particles contained within the bond material, the abrasive particles comprising nanocrystalline alumina.

Provided is a boehmite structure including a plurality of boehmite particles where adjacent boehmite particles are bonded to each other. In the boehmite structure, a boehmite crystallite size is 10 nm or less, and a porosity is 15% or less. Also provided is a method for producing the boehmite structure, including a mixing step of obtaining a mixture by mixing mechanochemically treated hydraulic alumina with a solvent including water, and a pressure heating step of pressurizing and heating the mixture under a condition of a pressure of 10 to 600 MPa and a temperature of 50 to 300 C.