The International Nickel Company, Inc.

Pq Corporation

Irwin Jerry Itzkovitch

Juraj Babjak

Elliot P Hertzenberg

Jose A Blanco

Ivan H Joyce

Gregory G Wortman

A process for the preparation of finely divided dispersible alpha-alumina monohydrate (boehmite) from alumina trihydrate is disclosed. The alumina trihydrate is calcined thereby increasing the surface area through a partial dehydration. The calcined intermediate is slurried in water and autoclaved to achieve crystallization and rehydration. Conventional drying methods are used to obtain the particles. The particle size of the product is much smaller than that of the starting raw material.

Process for preparing dispersible boehmite alumina

An improvement in the process of extracting metal from aqueous acidic solution using a quaternary ammonium thiocyanate extractant wherein a special amount of thiocyanate ion is introduced into the aqueous solution prior to or contemporaneously with the extraction. Results achieved are better extractions with little or no additional loss of thiocyanate ion in the aqueous raffinate.

Metal extraction process using quaternary ammonium thiocyanates

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Willowdale, Canada

Irwin Jerry Itzkovitch