Abstract: Nickel hydroxide for use in an electrode of a rechargeable battery is prepared by controlled precipitation from a neutralized reaction mixture of a nickel salt and an alkali metal hydroxide. The controlled precipitation results in the formation of generally spherical particles having a high density. Pulsed or constant ultrasonic energy is applied to the mixture or to a portion thereof during the reaction to cause an alteration in the micro and macrostructures and the surface characteristics of the particles. These alterations result in enhanced performance characteristics of the resultant electrode.

Abstract: Cobalt acetate solution is produced by flowing a circulating oxygen-containing stream of dilute acetic acid solution containing initially about 20% free acid through a bed of cobalt chips and adding dilute acetic acid solution and introducing additional oxygen into the circulating stream in replenishment of those reactants as the dissolution reaction proceeds.

Abstract: Metal values including those of cobalt, vanadium, aluminum, molybdenum and tungsten are recovered from spent petroleum refining catalyst by acid leaching the metal values except those of molybdenum or tungsten, separating the resulting solution from the leach residue and selectively recovering the cobalt, vanadium and aluminum values from the solution and recovering the molybdenum and tungsten values from the leach residue.