Process for the extraction of specific transition metals with gaseous HCL
AssigneeMetals Recovery Technology Inc.
InventorJoseph L. Thomas
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Abstract
A process is disclosed for separation and recovery of vanadium, molybdenum, iron, tungsten, cobalt and nickel from alumina-based materials, mattes, ores, manufacturing by-products and waste. These elements are oxidized. The oxides are reacted with gaseous HCl to form volatile chloride-bearing compounds that subsequently sublimate. The volatile compounds are condensed in a downward-stepped thermal gradient that allows collection of moderate to high purity compounds of individual elements with exception of a nickel-cobalt co-condensate. Nickel is separated from cobalt by precipitation of nickel chloride from concentrated HCl pressurized with gaseous HCl.
Claims16
A method for treating group metals selected from the group consisting of Ni, Co, W, Mo and V, comprising
- oxidizing in an oxygen containing atmosphere of at least about 1400° C. two or more of the group metals in group metal bearing material on an alumina substrate;
- reacting the oxidized group metals with HCl to form chloride compounds including one or more of chloride, oxychloride, partially hydrolyzed chloride and partially hydrolyzed oxychloride group metals.
A method for treating group metals selected from the group consisting of Ni, Co, W, Mo and V, comprising
- oxidizing two or more of the group metals in an oxygen containing atmosphere to oxide compounds with the two or more oxidized group metals being fully to the highest stable oxidized state of each;
- reacting the oxidized group metals with gaseous HCl to form volatile chloride compounds including one or more of chloride, oxychloride and partially hydrolyzed chloride and oxychloride group metals.
Dependencies are inferred from the claim text.