William Garth Tolley
Engineers in Salt Lake City, UT

4322390, Mar 30, 1982

Oct 27, 1980

6/200836

William K. Tolley - Salt Lake City UT
William C. Laughlin - Schaumburg IL

UOP Inc. - Des Plaines IL

C22B 300

423 27

Desired metal values are recovered from metal-bearing sources by subjecting said metal-bearing sources to a reduction step which is effected in an aqueous solution of an ammoniacal ammonium salt containing a reducing reagent such as hydrazine, hydroxylamine hydrochloride, etc. , or by treatment with carbon monoxide in the presence of a metal chelate such as that formed from cobalt sulfate and dimethyl glyoxime, and thereafter subjecting the reduced source to an oxidative leach by treatment wth an oxygen-containing gas such as air or oxygen. The reducing step is effected at ambient temperatures and pressures and the oxidative step is effected at ambient temperatures and pressures ranging from about 5 to about 500 psig. Desired metal values such as nickel and cobalt may be recovered in commercially attractive yields.

4382082, May 3, 1983

Dec 21, 1981

6/333245

William C. Laughlin - Schaumburg IL
William K. Tolley - Salt Lake City UT

UOP Inc. - Des Plaines IL

C01G 5100

423150

The recovery of metal values such as cobalt may be improved in a hydrometallurgical recovery of metal values from metal-bearing sources such as ores and the like. The hydrometallurgical recovery process involves subjecting a metal-bearing source to a reductive roast in a reducing atmosphere after having treated said source with at least one additive. Thereafter, the reduced metal-bearing source is cooled and extracted by a leaching operation such as treatment with an ammoniacal ammonium salt solution. The leaching step is followed by a separation of various metal values by adding a solid adsorbent to the leach solution whereby selective metal ions are adsorbed thereon. The improvement of the process involves subjecting the solid adsorbent to a stripping operation with a stripping agent such as steam or a gas at an elevated temperature prior to recovery of the adsorbed metal ions from the solid adsorbent by conventional means such as acid-stripping.

4312841, Jan 26, 1982

Jun 25, 1980

6/162970

William K. Tolley - Salt Lake City UT
Pieter D. Rademaker - Tucson AZ

UOP Inc. - Des Plaines IL

C01G 5100, C01G 5300

423150

The present process involves an improvement in the hydrometallurgical recovery of metal values from metal bearing sources such as ores and the like. The metal values are obtained by subjecting a metal bearing source to a reductive roast at an elevated temperature followed by cooling the reduced metal bearing source, extracting the cooled source and recovering the resultant metal values. An improvement in this process is effected by adding a compound containing a metal of Group IA or IIA of the Periodic Table to the source before subjecting the source to the reductive roast. Following the roast the ore is quenched in an aqueous solution and thereafter subjected to an extraction step.

4416693, Nov 22, 1983

Dec 17, 1981

6/331846

William K. Tolley - Salt Lake City UT

UOP, Inc. - Des Plaines IL

C21B 1500, C01G 2304

75101R

Titanium metal values may be recovered from a metal-bearing source containing titanium and iron by subjecting the source to an oxidation treatment and a reductive roast. After having crushed the source to a desired particle size, the reduced source is then leached by treatment with a halogen-containing compound to form soluble halides, following which the soluble titanium halide is precipitated as titanium dioxide by treatment with an iron oxide such as ferric oxide and recovered. The amount of titanium dioxide which is recovered may be optimized by utilizing a reductant such as hydrogen or carbon monoxide in an amount in the range of from about 1. 5 to about 4. 5 times the stoichiometric amount required to reduce the iron oxide to metallic oxide during the reductive roast.

4853205, Aug 1, 1989

Mar 12, 1987

7/025252

William K. Tolley - Salt Lake City UT
Alton B. Whitehead - Sandy UT

The United states of America as represented by the Secretary of the
Interior - Washington DC

C01B 900, C01B 902, C01F 762, C01G 2302

423472

Process of using supercritical fluid to selectively separate, purify and recover metal halides.