Provided are a nano-sized thin sheet-like pseudoboehmite and a method of producing the same. The method of producing a sheet-like pseudoboehmite is performed by a one-pot method, unlike the conventional method of performing the reaction first in a basic solution, and then performing redispersion in an acidic solution, thereby simplifying the production process, and thus, may be useful in the production industry of a separator for a secondary battery, and the like.

A method for obtaining at least one particle, including: (a) preparing solution A including at least one precursor of at least one of Si, B, P, Ge, As, Al, Fe, Ti, Zr, Ni, Zn, Ca, Na, Ba, K, Mg, Pb, Ag, V, Te, Mn, Ir, Sc, Nb, Sn, Ce, Be, Ta, S, Se, N, F, and Cl; (b) preparing aqueous solution B; (c) forming droplets of solution A; (d) forming droplets of solution B; (e) mixing droplets; (f) dispersing mixed droplets in a gas flow; (g) heating dispersed droplets to obtain the at least one particle; (h) cooling the at least one particle; and (i) separating and collecting the at least one particle. The aqueous solution is acidic, neutral, or basic. In step (a) and/or step (b) at least one colloidal suspension of a plurality of nanoparticles is mixed with the solution. Also, a device for implementing the method.

A method for obtaining at least one particle, including: (a) preparing solution A including at least one precursor of at least one of Si, B, P, Ge, As, Al, Fe, Ti, Zr, Ni, Zn, Ca, Na, Ba, K, Mg, Pb, Ag, V, Te, Mn, Ir, Sc, Nb, Sn, Ce, Be, Ta, S, Se, N, F, and Cl; (b) preparing aqueous solution B; (c) forming droplets of solution A; (d) forming droplets of solution B; (e) mixing droplets; (f) dispersing mixed droplets in a gas flow; (g) heating dispersed droplets to obtain the at least one particle; (h) cooling the at least one particle; and (i) separating and collecting the at least one particle. The aqueous solution is acidic, neutral, or basic. In step (a) and/or step (b) at least one colloidal suspension of a plurality of nanoparticles is mixed with the solution. Also, a device for implementing the method.

An alumina particle production method comprising a step of firing an aluminum compound in presence of a molybdenum compound and a potassium compound, the aluminum compound containing aluminum hydroxide.

An alumina particle production method comprising a step of firing an aluminum compound in presence of a molybdenum compound and a potassium compound, the aluminum compound containing aluminum hydroxide.

Provided are a method for producing boehmite nanoparticles and an apparatus for producing the same, and more particularly, a method for producing boehmite nanoparticles and an apparatus for producing the same, which allow continuous production of nano-sized boehmite nanoparticles in a uniform size. The method for producing boehmite nanoparticles includes (S1) supplying a mixture including an aluminum hydroxide and an organic acid to a reaction unit; and (S2) heating and pressurizing the mixture supplied to the reaction unit simultaneously and sequentially.

Provided are a method for producing boehmite nanoparticles and an apparatus for producing the same, and more particularly, a method for producing boehmite nanoparticles and an apparatus for producing the same, which allow continuous production of nano-sized boehmite nanoparticles in a uniform size. The method for producing boehmite nanoparticles includes (S1) supplying a mixture including an aluminum hydroxide and an organic acid to a reaction unit; and (S2) heating and pressurizing the mixture supplied to the reaction unit simultaneously and sequentially.

A pseudo-boehmite has a dry basis content of 55-85 wt % and contains a phosphoric acid ester group. The sodium oxide content is not greater than 0.5 wt %, and the phosphorus content (in terms of phosphorus pentoxide) is 1.2-5.7 wt %, relative to 100 wt % of the total weight of the pseudo-boehmite. The pseudo-boehmite has a low sodium content.

A pseudo-boehmite has a dry basis content of 55-85 wt % and contains a phosphoric acid ester group. The sodium oxide content is not greater than 0.5 wt %, and the phosphorus content (in terms of phosphorus pentoxide) is 1.2-5.7 wt %, relative to 100 wt % of the total weight of the pseudo-boehmite. The pseudo-boehmite has a low sodium content.

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.