Uranium Pechiney

Aluminium Pechiney

Pierre-Bernard Personnet

Jean-Michel Lamerant

Jean-Claude Bontron

Francois Pallez

Jean-Michel Philbert

A process for the treatment of spent pot linings impregnated with alkali metal cyanide and fluoric products by grinding previously crushed pot linings in the presence of lime, suspending the ground pot linings in an aqueous medium in order to precipitate a flux in the form of CaF.sub.2 accompanied by the release of soda, followed by the heating of the suspension at a temperature T&gt;140.degree. C. in the presence of clay to form, after fixing the free soda, insoluble synthetic silicate compounds of the feldspathoid or zeolite type and finally the separation by filtration of the resulting solid phase from the liquid phase, which liquid phase is recycled to form a new ground pot lining suspension.

Process for the wet treatment of spent pot linings from hall-heroult

Process for pretreatment at atmospheric pressure or a pressure close to atmospheric pressure by alkaline wetting and holding at temperature of natural materials whose gangue comprises argillaceous compounds capable of forming a stable plastic suspension in the presence of water and containing at least one combustible element which can be put into useful form wherein, in order to permit subsequent easy operations for separation of the liquid aqueous and solid phases of the gangue:

Pretreatment by alkaline wetting and holding at temperature of natural

High-temperature pretreatment by means of an alkaline aqueous solution

Growing community of inventors

Saint-Jean-de-Mauriene, France

Pierre-Bernard Personnet