Process for the extraction of specific transition metals

A method of treating metals selected from the group consisting of Ni, Co, W, Mo and V on an alumina substrate, comprising

• charging a reaction vessel with the porous alumina substrate having at least two of the metals on the alumina and combustible material in situ on the porous alumina substrate;
• inducing oxygen containing gas to flow through the porous alumina substrate in the reaction vessel;
• oxidizing a plurality of the group metals on the alumina substrate at a temperature at or above 1400° C.;
• maintaining the oxidizing of the metals in the porous alumina substrate at or above 1400° C. to take the metals to the highest oxidation state of each.

A method of treating metals selected from the group consisting of Ni, Co, W, Mo and V on an alumina substrate, comprising

• oxidizing a plurality of the group metals including Ni and Co on the alumina substrate at a temperature at or above 1400° C.;
• reacting the oxidized group metals with anhydrous gaseous HCl to form volatile chloride-bearing compounds;
• dissolving the chloride-bearing compounds in a Ni-bearing solution of 0-30% aqueous HCl;
• pressurizing the Ni-bearing solution with gaseous HCl to form and to precipitate NiCl2,2H2O.