David L Baughman

US Patent:

6464736, Oct 15, 2002

Filed:

Mar 9, 2000

Appl. No.:

09/521828

Inventors:

Wayne C. Hazen - Denver CO
David R. Baughman - Golden CO
Rudolph Pruszko - Dubuque IA

Assignee:

Environmental Projects, Inc. - Casper WY

International Classification:

B01D 900

US Classification:

23295R, 23298, 23301, 23302 T, 23302 R

Abstract:

The present invention provides a process for producing crystals of a polymorphic compound in a first crystal structure by introduction of the compound in a second crystal structure into a saturated brine solution of the compound under conditions in which formation of the first crystal structure is favored and without evaporation or changes in temperature. As the second crystal structure dissolves, the brine becomes supersaturated resulting in relief of supersaturation by formation of crystals of the first crystal structure. The process includes controlling supersaturation and its relief to achieve growth of existing crystals of the first crystal structure rather than nucleation and formation of new crystals. The resulting crystals are separated from insoluble impurities on a size separation basis.

US Patent:

20030084547, May 8, 2003

Filed:

Jul 20, 2001

Appl. No.:

09/910333

Inventors:

Wayne Hazen - Denver CO, US
Dale Denham - Arvada CO, US
Rudolph Pruszko - Green River WY, US
David Baughman - Golden CO, US

Assignee:

Environmental Projects, Inc.

International Classification:

C01D007/00

US Classification:

023/30200T, 423/421000, 423/206200

Abstract:

The present invention provides a process for producing sodium carbonate monohydrate crystals by introduction of anhydrous sodium carbonate into a saturated sodium carbonate brine solution under conditions in which sodium carbonate monohydrate formation is favored. As the anhydrous sodium carbonate dissolves, the brine becomes supersaturated resulting in relief of supersaturation by formation of sodium carbonate monohydrate crystals. The process includes controlling supersaturation and its relief to achieve growth of existing sodium carbonate monohydrate crystals rather than nucleation and formation of new sodium carbonate monohydrate crystals. The resulting crystals are separated from insoluble impurities on a size separation basis.

US Patent:

62840053, Sep 4, 2001

Filed:

Jan 28, 1999

Appl. No.:

9/239441

Inventors:

Wayne C. Hazen - Denver CO
Dale Lee Denham - Arvada CO
Rudolph Pruszko - Green River WY
David R. Baughman - Golden CO
Ralph B. Tacoma - Evanston WY

Assignee:

Environmental Projects, Inc. - Casper WY

International Classification:

C01D 1508

US Classification:

23302T

Abstract:

The present invention provides a process for producing sodium carbonate monohydrate crystals by introduction of anhydrous sodium carbonate into a saturated sodium carbonate brine solution under conditions in which sodium carbonate monohydrate formation is favored. As the anhydrous sodium carbonate dissolves, the brine becomes supersaturated resulting in relief of supersaturation by formation of sodium carbonate monohydrate crystals. The process includes controlling supersaturation and its relief to achieve growth of existing sodium carbonate monohydrate crystals rather than nucleation and formation of new sodium carbonate monohydrate crystals. The resulting crystals are separated from insoluble impurities on a size separation basis.

US Patent:

51695030, Dec 8, 1992

Filed:

Jun 24, 1988

Appl. No.:

7/210986

Inventors:

David R. Baughman - Golden CO
Ray V. Huff - Golden CO
Steven G. Axen - Golden CO

International Classification:

C25C 100
C22B 300
C22B 1100

US Classification:

204105R

Abstract:

Metal values are solubilized from ore by a lixiviant having a pH from 5 to 8, comprising an aqueous solution of a chloride salt and a hypochlorite salt. Cyanuric acid may be added to retard decomposition of the lixiviant. In one alternative embodiment, any remaining hypochlorite ions are then eliminated by adding hydrogen peroxide or a reducing agent to the pregnant lixiviant. Metal values are recovered by reduction using carbon, electrowinning, or other conventional techniques. In an alternative embodiment for extraction of gold or silver, the steps are combined by using finely ground ore containing sulfides or carbonaceous material to both reduce any remaining hypochlorite ions and precipitate the metal values from the lixiviant. The lixiviant can then be regenerated either by electrolysis or addition of hypochlorite salt.

US Patent:

50300369, Jul 9, 1991

Filed:

Jan 5, 1987

Appl. No.:

7/000200

Inventors:

Ray V. Huff - Golden CO
Steven G. Axen - Golden CO
David R. Baughman - Golden CO

Assignee:

ISL Ventures, Inc. - Golden CO

International Classification:

E02D 312

US Classification:

405266

Abstract:

A method of isolating a contaminated geological formation or aquifer is disclosed in which the formation is encapsulated by impermeable barriers. A grid of wells is drilled into the formation. A horizontal barrier is formed below the contaminated formation by creating an overlapping pattern of horizontally-oriented fractures filled with polymer radiating from each of these wells. A horizontal barrier may also be formed above the top surface of the contaminated formation if necessary. A ring of boundary wells may also be drilled surrounding the contaminated formation. The strata around each boundary well are fractured, and a polymer is then injected to form a vertical barrier around the periphery of the contaminated formation. In addition, water may be injected under pressure into guard wells between the contaminated formation and the vertical and/or horizontal barriers to further reduce any migration of pollutants into neighboring formations.

US Patent:

20180209015, Jul 26, 2018

Filed:

Jul 21, 2016

Appl. No.:

15/746321

Inventors:

- Golden CO, US
David R. BAUGHMAN - Golden CO, US
Wayne W. HAZEN - Lakewood CO, US

International Classification:

C22B 59/00
C01F 17/00
C22B 1/16
C22B 3/10
C22B 34/12
C22B 34/14
C22B 34/24

Abstract:

The present invention relates to the recovery of rare earths, scandium, niobium, tantalum, zirconium, hafnium, titanium, and the like from ores or concentrates containing fluorine. More specifically, the ores or concentrates are pretreated by carbochlorination to convert the rare earths and other metals into their chlorides and then subjected to dilute hydrochloric acid leaching to recover the valuable rare earths and other metals from the leachate. Niobium, tantalum, zirconium, hafnium, and titanium can be recovered as their chlorides or oxychlorides from the gaseous products of carbochlorination, or converted into their oxides while simultaneously regenerating chlorine.

US Patent:

20140193317, Jul 10, 2014

Filed:

Jan 9, 2014

Appl. No.:

14/151177

Inventors:

- Sunnyvale CA, US
Wayne Werneke Hazen - Lakewood CO, US
David Ross Baughman - Golden CO, US
Christel Maria Angelina Bemelmans - Indian Hills CO, US
Pavel Federovich Belits - Boulder CO, US
Timothy James Lanyk - Golden CO, US
Brook Forest Porter - Menlo Park CA, US
Justin McAllister - Sunnyvale CA, US
Michael Shang-Yu Yang - Foster City CA, US

Assignee:

Bloom Energy Corporation - Sunnyvale CA

International Classification:

C22B 59/00

US Classification:

423 215

Abstract:

A method for selectively removing scandium from a scandium-containing feed solution includes contacting the scandium-containing feed solution with a solvent stream in plural stages using cross current extraction, in which the solvent is loaded with at least a portion of the scandium from the feed solution, and/or ion exchange, and separating the loaded solvent from remaining scandium-containing feed solution.