Method for the reduction of nickel from an aqueous solution
AssigneeOutokumpu Oyj
InventorsMatti Hämäläinen, Sigmund Fugleberg, Kari Knuuttila
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Abstract
The invention relates to a method for the precipitation of nickel from an aqueous solution containing its sulphate as a metallic powder suitable as an alloying element for refined steel. In this method, nickel reduction takes place continuously in one or several autoclaves at a temperature of 80-180° C. and hydrogen pressure of 1-20 bar, whereby the production capacity can be raised significantly, compared to batch processes made in correspondingly dimensioned devices or equipment.
Claims29
A method of the reduction of nickel powder suitable as a component of refined steel, comprising reducing an aqueous solution containing nickel sulphate in a pressurised space using hydrogen as the reducing agent, the reduction occurring continuously at a temperature between 110-160° C. and at a hydrogen pressure between 2-10 bar in at least one autoclave, which is divided into sections by partitions, where each section is equipped with a mixer, and removing the aqueous solution from the at least one autoclave.
A method of the reduction of nickel powder suitable as a component of refined steel, comprising reducing an aqueous solution containing nickel sulphate in a pressurised space using hydrogen as the reducing agent, the reduction occurring continuously at a temperature between 110-160° C. and at a hydrogen pressure between 2-10 bar in a plurality of autoclaves, wherein reduction occurs in said autoclaves, which are arranged in series and equipped with mixers, and removing the aqueous solution from said autoclaves.
Dependencies are inferred from the claim text.