Provided are a tabular alumina particle and a method for manufacturing it, wherein the particle has a major axis of 30 μm or more, a thickness of 3 μm or more, and an aspect ratio of 2 to 50 and contains molybdenum; and the method includes the steps of mixing an aluminum compound of 10% by mass or more in a form of Al.sub.2O.sub.3, a molybdenum compound of 20% by mass or more in a form of MoO.sub.3, a potassium compound of 1% by mass or more in a form of K.sub.2O, and silicon or a silicon compound of less than 1% by mass in a form of SiO.sub.2, where total amount of raw materials is assumed to be 100% by mass in forms of oxides, so as to produce a mixture and firing the resulting mixture.

Provided are a tabular alumina particle and a method for manufacturing it, wherein the particle has a major axis of 30 μm or more, a thickness of 3 μm or more, and an aspect ratio of 2 to 50 and contains molybdenum; and the method includes the steps of mixing an aluminum compound of 10% by mass or more in a form of Al.sub.2O.sub.3, a molybdenum compound of 20% by mass or more in a form of MoO.sub.3, a potassium compound of 1% by mass or more in a form of K.sub.2O, and silicon or a silicon compound of less than 1% by mass in a form of SiO.sub.2, where total amount of raw materials is assumed to be 100% by mass in forms of oxides, so as to produce a mixture and firing the resulting mixture.

A method of producing a hydrophobic porous alumina by: i) providing a slurry comprising an alumina compound, the slurry having a pH equal to or greater than 7; ii) adding an organic composition comprising carboxylic acids with alkyl hydrocarbon chains having a carbon length less than 14 to the slurry to form an acidic modified slurry; the acidic modified slurry having a pH of between 3 and less than 7; iii) hydrothermally aging the acidic modified slurry to form a hydrothermally aged slurry; and iv) drying the hydrothermally aged slurry.

A method of producing a hydrophobic porous alumina by: i) providing a slurry comprising an alumina compound, the slurry having a pH equal to or greater than 7; ii) adding an organic composition comprising carboxylic acids with alkyl hydrocarbon chains having a carbon length less than 14 to the slurry to form an acidic modified slurry; the acidic modified slurry having a pH of between 3 and less than 7; iii) hydrothermally aging the acidic modified slurry to form a hydrothermally aged slurry; and iv) drying the hydrothermally aged slurry.

Processes of selectively depositing a metal-containing film comprise: providing a surface having a plurality of materials exposed thereon simultaneously, and exposing the surface to a vapor of a metal-containing film-forming composition that contains a precursor having the formula:

L.sub.xM(—N(R)—(CR′.sub.2).sub.n—NR″.sub.2)

wherein M is a Group 12, Group 13, Group 14, Group 15, Group IV or Group V element; x+1 is the oxidation state of the M; L is an anionic ligand, independently selected from dialkylamine, alkoxy, alkylimine, bis(trialkylsilylamine), amidinate, betadiketonate, keto-imine, halide, or the like; R, R″ each are independently a C.sub.1-C.sub.10 linear, branched or cyclic alkyl, alkenyl, or trialkylsilyl group; R′ is H or a C.sub.1-C.sub.10 linear, branched or cyclic alkyl, alkenyl or trialkylsilyl group; n=1-4,
wherein at least one of the materials is at least partially blocked by a blocking agent from the deposition of the metal-containing film through a vapor deposition process.

An alumina having a multimodal particle size distribution wherein at least one of the particle sizes giving local maximum values in the particle size distribution is less than 10 m, and wherein the alumina comprises 1 to 5 wt % of at least one of La and Ba.

An alumina having a multimodal particle size distribution wherein at least one of the particle sizes giving local maximum values in the particle size distribution is less than 10 m, and wherein the alumina comprises 1 to 5 wt % of at least one of La and Ba.

Provided is a method for inhibiting extractant degradation in the DSX process through the metal extraction control, the method comprising steps of: (a) adding limestone to a copper solvent extraction-raffinate to precipitate iron (Fe) and aluminum (Al) as a slurry, recovering a clarifying liquid; and (b) adding sulfuric acid to the recovered clarifying liquid to adjust the pH thereof.

A method comprises reacting an aluminum feedstock with an acid in the presence of water to provide an aluminum salt solution comprising an aluminum salt in water, wherein the aluminum salt comprises a reaction product of the acid and aluminum, and spray roasting the aluminum salt solution at a temperature of at least about 450 C. to provide an aluminum oxide powder, wherein the spray roasting is performed in a furnace lined with a refractory comprising alumina that is at least about 99.2% purity alumina, and wherein the aluminum oxide powder is 99.2% pure aluminum oxide or greater.

A method comprises reacting an aluminum feedstock with an acid in the presence of water to provide an aluminum salt solution comprising an aluminum salt in water, wherein the aluminum salt comprises a reaction product of the acid and aluminum, and spray roasting the aluminum salt solution at a temperature of at least about 450 C. to provide an aluminum oxide powder, wherein the spray roasting is performed in a furnace lined with a refractory comprising alumina that is at least about 99.2% purity alumina, and wherein the aluminum oxide powder is 99.2% pure aluminum oxide or greater.