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Control of pyrite surface chemistry in physical coal cleaning
The successful separation of pyrite from coal by flotation is dependent to a large extent upon the selectivity of the process, and the use of a pyrite depressant is one of the most important and cost-effective techniques for achieving this. This report evaluates the effects of three factors on the floatability of pyrite. These are (1) the superficial oxidation of pyrite, (2) the contamination of pyrite surfaces by carbonaceous matter, and (3) pulp redox potentials. XPS (x-ray photoelectron spectroscopy) and IR spectrometry have been used to identify surface reaction products. Microflotation, laboratory-scale conventional flotation and microbubble column flotation were used to quantify the effects of these factors. It was found that low (reducing) pulp potentials are effective depressants of pyrite (more so for fresh, unoxidized samples than for oxidized samples), whilst at the same time do not materially affect coal flotation.
Date:
June 24, 1992
Creator:
Luttrell, G. H.; Yoon, R. H. & Ou, Z. S.
Object Type:
Report
System:
The UNT Digital Library
Control of pyrite surface chemistry in physical coal cleaning
To better understand the surface chemical properties of coal and mineral pyrite, studies on the effect of flotation surfactants (frother and kerosene) on the degree of hydrophobicity have been conducted. The presence of either frother or kerosene enhanced the flotability of coal and mineral pyrite with a corresponding decrease in induction time over the pH range examined. Scanning electron microscopy (SEM) results indicate a correlation exists between the sample surface morphology and crystal structure and the observed hydrophobicity. As a result of the data obtained from the surface characterization studies, controlled surface oxidation was investigated as a possible pyrite rejection scheme in microbubble column flotation.
Date:
June 24, 1992
Creator:
Luttrell, G. H.; Yoon, R. H.; Zachwieja, J. & Lagno, M.
Object Type:
Report
System:
The UNT Digital Library
Control of pyrite surface chemistry in physical coal cleaning
One of the most difficult separations in minerals processing involves the differential flotation of pyrite and coal. Under practical flotation conditions, they are both hydrophobic and no cost-effective method has been developed to efficiently reject the pyrite. The problem arises from inherent floatability of coal and pyrite. Coal is naturally hydrophobic and remains so under practical flotation. Although pyrite is believed to be naturally hydrophilic under practical flotation conditions it undergoes a relatively rapid incipient oxidation reaction that causes self-induced'' flotation. The oxidation product responsible for self-induced'' flotation is believed to be a metal polysulfide, excess sulfur in the lattice, or in some cases elemental sulfur. It is believed that if incipient oxidation of pyrite could be prevented, good pyrite rejection could be obtained. In order to gain a better understanding of how pyrite oxidizes, a new method of preparing fresh, unoxidized pyrite surfaces and a new method of studying pyrite oxidation have been developed this reporting period.
Date:
June 24, 1992
Creator:
Yoon, R. H. & Richardson, P. R.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0124.0366]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Thomas Carey will appear as Joe in Lyric Theatre's production of "Show Boat."
Date:
June 24, 1993
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Tax Administration: EEO Issues in IRS' Midwest District Office
Correspondence issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on equal employment opportunity (EEO) issues in the Internal Revenue Service's (IRS) Midwest District Office."
Date:
June 24, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Personnel Practices: Reimbursable Interagency Details
Correspondence issued by the General Accounting Office with an abstract that begins "GAO identified weaknesses in the Department of Agriculture's (USDA) personnel practices."
Date:
June 24, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Federal Power: The Role of the Power Marketing Administrations in a Restructured Electricity Industry
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the role of the power marketing administrations (PMA) in a restructured electricity industry, focusing on five goals of deregulating the retail electricity market."
Date:
June 24, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Contract Management: DOD Pricing of Commercial Items Needs Continued Emphasis
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the Department of Defense's (DOD) pricing of commercial items, focusing on: (1) the extent of price analysis DOD contracting personnel were performing to arrive at fair and reasonable prices for commercial sole-source items; (2) how well contract personnel performed price analyses; and (3) what guidance and training was available to assist them in determining price reasonableness."
Date:
June 24, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Homeless Veterans: VA Expands Partnerships, but Effectiveness of Homeless Programs Is Unclear
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed its recent report on the Department of Veterans Affairs (VA) homeless programs, focusing on: (1) VA's programs to address homelessness, including efforts made in partnership with community-based organizations; and (2) what VA knows about the effectiveness of its homeless programs."
Date:
June 24, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Information Security: Recent Attacks on Federal Web Sites Underscore Need for Stronger Information Security Management
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the recent break-ins of federal web sites."
Date:
June 24, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
[Photograph 2012.201.B0139.0620]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Tyler, Dee, Lane and Bevan Colley, from left, line up for the photographer at a "Midsummer Night's Dance" deb party at the Oklahoma City Art Museum at Nichols Road."
Date:
June 24, 1994
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0172.0303]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Lelia Hankey, 11, in photo above looks at the surface of clay bookends she is preparing for the 1994 Youth Impressions Juried Art show, sponsored by the Fine Arts Institute of Edmond."
Date:
June 24, 1994
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0338.0071]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "They bring gifts to the deceased, which symbolizes the material things they would use on their journey to the afterlife," Smith & Kernke funeral director Joe Kernke Jr. says in describing traditional Vietnamese funerals he now knows well."
Date:
June 24, 1993
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0268.0240]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Dr. Patricia Hubartt (veterinarian & Clinic Owner)"
Date:
June 24, 1994
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0251.0892]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "James Hart from Wichita, Ks. lobbs one over the hands of an opponent."
Date:
June 24, 1994
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0352.0650]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
June 24, 1992
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0247.0639]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Oklahoma City shortstop Larry hanlon jumps over a sliding John Wehner of Buffalo on the front end of a double play Thursday night."
Date:
June 24, 1993
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0253.0493]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Fine tool & wood store"
Date:
June 24, 1993
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0245.0618]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Kay Lindsey, Minna Hall, Jerry Love and Evie Wood, from left, look through Decorator's Show House scrapbooks at a recent appreciation luncheon for Show House chairmen."
Date:
June 24, 1992
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0253.0491]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Cheryl is shown with some of the tools of the woodcarving trade"
Date:
June 24, 1993
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0266.0541]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Jesse An Arnold, Georgia Houk, Lynne Hardin, Crawford Downs and Don Lisle at the dinner in the engaged couple's honor."
Date:
June 24, 1995
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0253.0492]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Cheryl Hays is one woman who has carved a niche for herself in the world of woodworking"
Date:
June 24, 1993
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0229.0308]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Above, Jim and Chris Gregath practice putting in their yard."
Date:
June 24, 1993
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0174.0017]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
June 24, 1995
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History