Thomas James Crossley
Electrician in Littleton, CO

4393028, Jul 12, 1983

Jun 12, 1981

6/273175

Thomas J. Crossley - Littleton CO

Wyoming Mineral Corporation - Lakewood CO

C01G 4300

423 15

Disclosed is a method of removing uranium from a slurry containing a water-insoluble molybdate and a Group II element, usually calcium. The pH of the slurry is raised with an alkali metal hydroxide and maintained at a level sufficiently high to solubilize insoluble molybdenum compounds. This will generally require a pH of at least 10 which can be achieved by adding sodium hydroxide. Carbonate ion is then added to the slurry in an amount at least sufficient to precipitate the cation of the insoluble molybdenum compound. And finally, the solid portion of a slurry, which now contains calcium carbonate and sodium uranate, is separated from the liquid portion, which contains a soluble molybdenum compound.

4407781, Oct 4, 1983

Mar 5, 1981

6/240655

Thomas J. Crossley - Littleton CO
Thomas P. Zinge - Lakewood CO

Westinghouse Electric Corp. - Pittsburgh PA

C01G 4300, C01G 3900

423 15

A method is disclosed for separating uranium from molybdenum in an aqueous solution. The pH of the solution is lowered to about 1 to about 4 using an inorganic acid such as hydrochloric acid. The carbon dioxide is then removed from the solution which can be done by aeration. The pH of the solution is raised to about 9 in the presence of ammonium ions which result in the precipitation of ammonium diuranate. The precipitated ammonium diuranate may then be filtered or otherwise separated from the molybdenum which remains in the solution.