Patent ID: 7939463
Filing Date: 2011-05-10
Classification: B01J,C01G,C01P,C10G

Abstract:
1. A process for making a high purity iron material, wherein an iron metal is combined with an aqueous organic acid solution and an oxidative agent is forced through said acid solution until essentially all of said iron metal is consumed and an iron material slurry is formed and said iron material slurry is then milled, the improvement comprising: combining said iron metal and said aqueous organic acid solution in a vessel while maintaining an inert gas purge and while maintaining agitation, said iron metal being added to water in said vessel and said inert gas purge and agitation being initiated before the introduction of said aqueous organic acid solution; allowing said iron metal and said organic acid to react for a predetermined period of time while said iron metal is digested and said iron material slurry is formed; stopping said inert gas purge and forcing said oxidizing agent into said vessel, and then stopping addition of said oxidizing agent and increasing the temperature of the vessel until a gel precipitates; and filtering said gel precipitate and retaining a filter cake comprising predominantly ferrihydrite and having a surface area of at least 200 m