SILICA-POLYAMINE BASED EXTRACTION MATERIALS FOR THE SEPARATION OF COPPER IONS AND FERRIC IRON IN AQUEOUS LEACH LIQUIDS

摘要

A silica-polyamine based extraction material selectively removes copper from low concentration, low pH leach solutions separating copper from ferric iron or chloride ions. The silica-polyamine base is a reaction product of a polyamine and a covalently anchored trifunctional hydrocarbylsilyl that yields non-crosslinked amino groups to which picolychloride is attached. Typically the silica is silica gel, and hydro-carbylsilyl covalently bound to the silica gel surface is formed from the silanization of hydrated silica gel with trifunctional silane. The resulting product is a durable, high capacity extraction material that selectively captures copper at high flow rates and releases that copper into highly concentrated solutions.