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NOVEL IN-SITU METAL AND MINERAL EXTRACTION TECHNOLOGY
This white paper summarizes the state of art of in-situ leaching of metals and minerals, and describes a new technology concept employing improved fragmentation of ores underground in order to prepare the ore for more efficient in-situ leaching, combined with technology to continuously improve solution flow patterns through the ore during the leaching process. The process parameters and economic benefits of combining the new concept with chemical and biological leaching are described. A summary is provided of the next steps required to demonstrate the technology with the goal of enabling more widespread use of in-situ leaching.
Date:
September 22, 2004
Creator:
O'Gorman, Glenn; Michaelis, Hans von & Olson, Gregory J.
Object Type:
Report
System:
The UNT Digital Library
An Approach to Understanding Cohesive Slurry Settling, Mobilization, and Hydrogen Gas Retention in Pulsed Jet Mixed Vessels
The Hanford Waste Treatment and Immobilization Plant (WTP) is being designed and built to pretreat and vitrify a large portion of the waste in Hanford’s 177 underground waste storage tanks. Numerous process vessels will hold waste at various stages in the WTP. Some of these vessels have mixing-system requirements to maintain conditions where the accumulation of hydrogen gas stays below acceptable limits, and the mixing within the vessels is sufficient to release hydrogen gas under normal conditions and during off-normal events. Some of the WTP process streams are slurries of solid particles suspended in Newtonian fluids that behave as non-Newtonian slurries, such as Bingham yield-stress fluids. When these slurries are contained in the process vessels, the particles can settle and become progressively more concentrated toward the bottom of the vessels, depending on the effectiveness of the mixing system. One limiting behavior is a settled layer beneath a particle-free liquid layer. The settled layer, or any region with sufficiently high solids concentration, will exhibit non-Newtonian rheology where it is possible for the settled slurry to behave as a soft solid with a yield stress. In this report, these slurries are described as settling cohesive slurries.
Date:
May 22, 2009
Creator:
Gauglitz, Phillip A.; Wells, Beric E.; Fort, James A. & Meyer, Perry A.
Object Type:
Report
System:
The UNT Digital Library
Intermittent Elevated Radium Concentrations in Coastal Plain Groundwater of South Carolina, U.S.A.
To learn the cause of intermittent radium concentrations in groundwater of Coastal Plain aquifers, 31 groundwater wells in South Carolina, U.S.A. were sampled for radium and other geochemical parameters. Sediments cored from near the well screens were also sampled to examine any relationship between sediment properties and radium concentration in the groundwater. Elevated radium concentrations only occurred in groundwater with low electrical conductivity and pH values below 6.3. The adsorption edge for radium on hematite--a major surface active mineral in these aquifers--is at a pH value of about 6. Near this value, small changes in pH can result in significant adsorption or desorption of radium. In groundwater with initially low alkalinity, small intermittent decreases in partial pressure of carbon dioxide in groundwater cause decreases in pH and desorption of radium. The result is intermittent elevated radium concentrations.
Date:
September 22, 2005
Creator:
Denham, Miles; Millings, Margaret & Noonkester, Jay
Object Type:
Article
System:
The UNT Digital Library
Cherokeean Herald (Rusk, Tex.), Vol. 155, No. 44, Ed. 1 Wednesday, December 22, 2004
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
December 22, 2004
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 157, No. 40, Ed. 1 Wednesday, November 22, 2006
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
November 22, 2006
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 157, No. 1, Ed. 1 Wednesday, February 22, 2006
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
February 22, 2006
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 157, No. 5, Ed. 1 Wednesday, March 22, 2006
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
March 22, 2006
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
In-Plant Testing of High-Efficiency Hydraulic Separators, Phase II Annual Technical Progress Report: 2005
Hydraulic separators are commonly used for particle size classification and gravity concentration of minerals and coal. Unfortunately, the efficiency of these processes can be quite low due to poor equipment design and variations in feed consistency. To help alleviate these problems, an industry-driven R&D program has been undertaken to develop a new generation of hydraulic separators that are more efficient and less costly to operate and maintain. These units, which are commercially called the CrossFlow separator and HydroFloat separator, have the potential to improve performance (separation efficiency and throughput) and reduce operating costs (power consumption, water and reagent usage). In Phase I of this project, laboratory and pilot-scale test units were evaluated at various industrial sites in both the coal and mineral industries. Based on promising results obtained from Phase I, full-scale prototypes were purchased and installed by a major U.S. phosphate producer and a large eastern U.S. coal company. The test data obtained from these sites demonstrate that significant performance improvements can be realized through the application of these high-efficiency separators.
Date:
May 22, 2006
Creator:
Luttrell, G. H.; Honaker, R. Q.; Bratton, R. C.; Westerfield, T. C. & Kohmuench, J. N.
Object Type:
Report
System:
The UNT Digital Library
The NABIR Strategic Plan 2001
For more than 50 years, the U.S. created a vast network of more than 113 facilities for research, development, and testing of nuclear materials. As a result of these activities, subsurface contamination has been identified at over 7,000 discrete sites across the U.S. Department of Energy (DOE) complex. With the end of the Cold War threat, the DOE has shifted its emphasis to remediation, decommissioning, and decontamination of the immense volumes of contaminated groundwater, sediments, and structures at its sites. DOE is currently responsible for remediating 1.7 trillion gallons of contaminated groundwater, an amount equal to approximately four times the daily U.S. water consumption, and 40 million cubic meters of contaminated soil, enough to fill approximately 17 professional sports stadiums. It is estimated that more than 60% of DOE facilities have groundwater contaminated with metals or radionuclides. The only contaminant that appears more often than metal and radionuclide contaminants in groundwater is chlorinated hydrocarbons. More than 50% of all soil and sediments at DOE facilities are contaminated with metal and radionuclides, the contaminants found with the highest frequency in soil at all DOE waste sites. Indeed, while virtually all of the contaminants found at industrial sites nationwide can also be …
Date:
October 22, 2001
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Study of the Reactions Controlling the Mobility of Uranium in Ground and Surface Water Systems in Contact with Apatite
The objective of this project was to define the mechanisms, equilibria, kinetics, and extent of sorption of aqueous uranium onto hydroxyapatite (Ca{sub 5}(PO{sub 4}){sub 3}(OH)) for a range of pH, ionic strength, aqueous uranium concentration, dissolved carbon/air CO{sub 2}, and mineral surface area. We conducted chemical modeling, batch and flow-through experiments, chemical analysis, x-ray absorption and diffraction measurement, and electron microscopy. Our motivation was the need to immobilize U in water and soil to prevent it's entry into water supplies and ultimately, biological systems. Applying hydroxyapatite to in-situ treatment of uranium-bearing ground water could be an effective, low cost technology. We found that hydroxyapatite quickly, effectively, and reversibly sorbed uranium at a high capacity by inner-sphere complexation over a wide range of conditions. Our results indicate that at aqueous uranium concentrations below 10-20 ppb: (1) equilibrium sorption of uranium to hydroxyapatite occurs in hours, regardless of pH; (2) in ambient and CO{sub 2}-free atmospheres, over 98% of initial uranium is sorbed to hydroxyapatite, (3) in waters in equilibrium with higher air CO{sub 2} concentrations, sorption removed over 97% of aqueous uranium, except above pH 9, where aqueous uranium concentrations were reduced by less than 40%, and (4) at near-neutral pH, …
Date:
April 22, 2004
Creator:
Taffet, M
Object Type:
Report
System:
The UNT Digital Library
Comanche Chief (Comanche, Tex.), No. 21, Ed. 1 Thursday, September 22, 2005
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
September 22, 2005
Creator:
Wilkerson, James C., III
Object Type:
Newspaper
System:
The Portal to Texas History
De Leon Free Press (De Leon, Tex.), Vol. 116, No. 37, Ed. 1 Thursday, March 22, 2007
Weekly newspaper from De Leon, Texas that includes local, state, and national news along with advertising.
Date:
March 22, 2007
Creator:
Kestner, Laura
Object Type:
Newspaper
System:
The Portal to Texas History
Comanche Chief (Comanche, Tex.), No. 47, Ed. 1 Thursday, March 22, 2007
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
March 22, 2007
Creator:
Wilkerson, James C., III
Object Type:
Newspaper
System:
The Portal to Texas History
The Dublin Citizen (Dublin, Tex.), Vol. 14, No. 34, Ed. 1 Thursday, April 22, 2004
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
April 22, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Dublin Citizen (Dublin, Tex.), Vol. 17, No. 25, Ed. 1 Thursday, February 22, 2007
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
February 22, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Today Cedar Hill (Duncanville, Tex.), Vol. 38, No. 8, Ed. 1 Thursday, May 22, 2003
Weekly newspaper published in Duncanville, Texas that includes local Cedar Hill, state, and national news along with advertising.
Date:
May 22, 2003
Creator:
Gooch, Robin
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 127, No. 12, Ed. 1 Thursday, August 22, 2002
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 22, 2002
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
Citizens' Advocate (Coppell, Tex.), Vol. 21, No. 29, Ed. 1 Friday, July 22, 2005
Weekly newspaper from Coppell, Texas that includes local, state, and national news along with advertising.
Date:
July 22, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Scene: North Texas Daily (Denton, Tex.), Vol. 91, No. 24, Ed. 1 Friday, February 22, 2008
Weekly magazine edition of the daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
February 22, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County Advocate (Holliday, Tex.), Vol. 4, No. 46, Ed. 1 Thursday, February 22, 2007
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
February 22, 2007
Creator:
Stevens, Charlotte
Object Type:
Newspaper
System:
The Portal to Texas History
De Leon Free Press (De Leon, Tex.), Vol. 116, No. 33, Ed. 1 Thursday, February 22, 2007
Weekly newspaper from De Leon, Texas that includes local, state, and national news along with advertising.
Date:
February 22, 2007
Creator:
Kestner, Laura
Object Type:
Newspaper
System:
The Portal to Texas History
[TDNA Approve New Members]
A document detailing three new newspapers and two associate memberships that needed to be approved by the Texas Daily Newspaper Association board of directors. The motion to appove the newspaper members were read at a TDNA meeting on November 11, 2005.
Date:
November 22, 2005
Creator:
Texas Daily Newspaper Association
Object Type:
Text
System:
The UNT Digital Library
The Dublin Citizen (Dublin, Tex.), Vol. 12, No. 50, Ed. 1 Thursday, August 22, 2002
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
August 22, 2002
Creator:
Jeschke, Kymbirlee
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 131, No. 42, Ed. 1 Thursday, March 22, 2007
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
March 22, 2007
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History