process for making boehmite alumina
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process for making boehmite alumina

WO2011075286A1 - Process for making boehmite alumina,

This invention comprises a novel process for making boehmite alumina and comprises selecting an alumina, and heating it in the presence of an alkali metal hydroxide concentration of at least 0.2...

(PDF) Boehmite Process – A New Approach in Alumina

Alumina is produced almost exclusively for more than 100 years by the well-known Bayer process. One of the characteristics of the Bayer process is the production of pure crystalline gibbsite,...

Method for making modified boehmite alumina - Condea

Method for making modified boehmite alumina 1. A process for making a dispersible alumina comprising: reacting an aqueous slurry or aqueous dispersion or aqueous... 2. The process of claim 1 wherein said reaction mixture comprises a sol and

Boehmite Process: An Alternative Technology in Alumina ...

Boehmite process is an innovative variation of the current Bayer process for the production of smelter grade alumina. The claimed innovation of this process concerns the precipitation and...

(PDF) Boehmite Process – A New Approach in

Boehmite attracted our interest also because it formally has one water molecule in its structure per alumina (i.e., 15 wt % water with respect to alumina) and can be economically produced, for ...

US6224846B1 - Method for making modified boehmite

A process for making a modified boehmite alumina comprising reacting at elevated temperatures a boehmite alumina with a compound having the formula: X (SO 3 M ) n wherein X is an organic moiety, M in a monovalent cation, and n is an integer reflecting the number of SO 3 M groups bonded to said organic moiety to produce a reaction mixture containing modified boehmite alumina and recovering ...

Process for preparing dispersible boehmite alumina - PQ ...

We claim: 1. A process for preparing dispersible, colloidal sized particles of boehmite alumina, said boehmite alumina being characterized by a surface area of 35 to 250 m 2 /g and dispersibility such that up to 25% by weight boehmite solids can be dispersed in water containing 0.01 to 0.5% HCl, said process comprising the steps of: (a) calcining alumina trihydrate with a surface area of 0.2 ...

Process For Making Boehmite Alumina -

A process for making a modified boehmite alumina comprising reacting at elevated temperatures a boehmite alumina with a compound having the formula: X(SO3M)n wherein X is an organic moiety, M in a monovalent cation, and n is an integer reflecting the number of SO3M groups bonded to said organic moiety to produce a reaction mixture containing modified boehmite alumina and recovering solid ...

A Process For Manufacturing Of Boehmite Particulate ...

A process for the preparation of Boehmite particulate material from the waste containing Aluminium chloride. Aluminium sulfate, Aluminium carbide or any other Aluminium salt; said process comprising : a. preparing 2 to 15 wt. % of aqueous slurry of Aluminium hydroxide, said Aluminium hydroxide is

"AN IMPROVED PROCESS FOR THE PREPARATION OF

The process steps are: subjecting hydrous aluminum compounds selected from alumina trihydrate, Boehmite, Gibbsite, bayerite, diaspore to a hydrothermal reaction at a temperature in the range of 300° - 550°C for a period in the range of 1-4 hrs. at an autogenous pressure in the range of 500 - 5000 Psi to obtain the desired product.

US Patent for Preparation of alumina having increased ...

A process for making high porosity boehmite alumina comprising forming an aqueous dispersion of a boehmite alumina which has been obtained by hydrothermally treating an aqueous mixture of a precursor boehmite alumina at a pH of from about 5 to about 9 for a period of time sufficient to convert the greater portion of the precursor boehmite alumina to a colloidal sol, treating the dispersion of ...

Boehmite modification of nano grade α-alumina and the ...

01-07-2007  Alumina slurry settles easily under the action of gravity, which restricts alumina slurry applications. Several patents were registered for alumina and boehmite composites. Wassermann and Meyer discussed a process for making dispersible aluminum hydroxide.

Bayer Process: Manufacturing Of Alumina Making of

Alumina has a boiling point of 2980 degree Celsius and melting point of 2040 degree Celsius. Its molar mass is 101.96 g/mol. The Bayer Process: Alumina is the main components of bauxite, so bauxite is refined in order to produce Alumina. The Bayer process is the principal way for producing alumina

alumina sasol north american operations

Alumina: Boehmite, High Purity Alumina and Hydrotalcite. The main focus of Sasol's 'Inorganic and Catalysts' business unit is the production of synthetic aluminas and boehmites derived from aluminum alkoxides. Our aluminas and boehmites have high chemical purity and dispersibility.

Process for manufacturing alpha alumina from dispersible ...

A process for the production of alpha alumina which comprises providing a starting material which is an aqueous dispersion in which the dispersed phase consists of boehmite having a dispersibility of less than 70% and acidifying the dispersion to a pH of from 2 to 3 by adding acid in sufficient quantity to lower the pH to the above level but insufficient to cause the alumina compound to ...

Production of micro-crystalline boehmite from

01-02-2013  A hydrothermal leaching process was developed to produce fire retarding micro-boehmite (4–25 mm) using plant aluminium hydroxide (alumina trihydate, ATH) ( 200 °C, 1–2 MPa after 1 hour.

Preparation of alumina through a sol–gel process ...

Hydrated boehmite with nano-sized crystallites AlO(OH)0.8H 2 O are obtained through a very reproducible sol–gel procedure and characterized using powder X-ray diffraction, in-situ IR spectroscopy, thermal analysis, BET surface area and photoelectron spectroscopy. The unit cell parameters, obtained after deleting the first shifted (020) diffraction peak, are a = 3.686 Å, b = 12.179 Å and ...

US Patent for Process for producing stabilized alumina ...

A process for preparing a stabilized alumina wherein an aqueous slurry of a precursor boehmite alumina is admixed with an effective amount of a stabilizer such as a water-soluble salt of a polyvalent metal cation of Groups IIA and IIIB of the periodic table, the slurry containing the alumina and the stabilizer being aged at a pH of from about 3 to about 9 and a temperature greater than about ...

Boehmite modification of nano grade α-alumina and the ...

01-07-2007  Alumina slurry settles easily under the action of gravity, which restricts alumina slurry applications. Several patents were registered for alumina and boehmite composites. Wassermann and Meyer discussed a process for making dispersible aluminum hydroxide.

Bayer Process: Manufacturing Of Alumina Making of

Alumina has a boiling point of 2980 degree Celsius and melting point of 2040 degree Celsius. Its molar mass is 101.96 g/mol. The Bayer Process: Alumina is the main components of bauxite, so bauxite is refined in order to produce Alumina. The Bayer process is the principal way for producing alumina

alumina sasol north american operations

Alumina: Boehmite, High Purity Alumina and Hydrotalcite. The main focus of Sasol's 'Inorganic and Catalysts' business unit is the production of synthetic aluminas and boehmites derived from aluminum alkoxides. Our aluminas and boehmites have high chemical purity and dispersibility.

(PDF) Peptization mechanisms of boehmite used as ...

Moreover, use and performance of specific manufacturing process (such as oil-drop or extrusion) depends on the dispersion of boehmite and may even require the use of stable suspensions. This paper deals with 4 different kinds of boehmite used to identify key parameters controlling the behavior of boehmite during the peptisation process.

Mining and Refining – Process - World Aluminium

The Bayer Process is the most economic means of obtaining alumina from bauxite. Other processes for obtaining alumina from metal ores are also in use in some refineries, particularly in China and Russia, although these make up a relatively small percentage of global production. The process

Indian Patents. 216807:"A PROCESS FOR MAKING

A process for making Magnesium Acuminate spinal useful as refractories and engineering ceramics in the wide range of Magnesia content which comprises preparing aluminum oxide suspension in a solution of magnesium salt with dispersants such as herein described, adding to the said suspension a soluble hydroxide such as herein described, maintaining the pH in the range of 9.4 to 12.4 to obtain a ...

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