Search Results - "Dogan Paktunc"

Kinetics and mechanisms of the carbothermic reduction of chromite in the presence of nickel by Yu, Dawei, Paktunc, Dogan

“…Carbothermic reduction of chromite in the presence of nickel as the alloying element was investigated in a wide temperature range up to 1500 °C using…”
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Synthesis and phase transformations involving scorodite, ferric arsenate and arsenical ferrihydrite: Implications for arsenic mobility by Paktunc, Dogan, Dutrizac, John, Gertsman, Valery

“…Scorodite, ferric arsenate and arsenical ferrihydrite are important arsenic carriers occurring in a wide range of environments and are also common precipitates…”
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A cross scale investigation of galena oxidation and controls on mobilization of lead in mine waste rock by Bao, Zhongwen, Al, Tom, Couillard, Martin, Poirier, Glenn, Bain, Jeff, Shrimpton, Heather K., Finfrock, Y. Zou, Lanzirotti, Antonio, Paktunc, Dogan, Saurette, Emily, Hu, Yongfeng, Ptacek, Carol J., Blowes, David W.

“…Galena and Pb-bearing secondary phases are the main sources of Pb in the terrestrial environment. Oxidative dissolution of galena releases aqueous Pb and SO4…”
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Calcium Chloride-Assisted Segregation Reduction of Chromite: Influence of Reductant Type and the Mechanism by Dawei Yu, Dogan Paktunc

“…This paper describes an innovative process for the production of ferrochromium alloy via segregation reduction of chromite at 1300 °C in the presence of…”
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Direct Production of Ferrochrome by Segregation Reduction of Chromite in the Presence of Calcium Chloride by Yu, Dawei, Paktunc, Dogan

“…A solid reduction process is described whereby chromite is reduced with the help of calcium chloride to produce ferrochrome alloy powders with high metal…”
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Composition and Cr- and Fe-speciation of dust generated during ferrochrome production in a DC arc furnace by Berryman, Eleanor J., Paktunc, Dogan, Kingston, David, Beukes, Johan P.

“…A potential hazard associated with ferrochrome production is the unintentional generation of Cr(VI) in the off-gas dusts produced during smelting. Cr(VI) is a…”
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Mechanism of the Direct Reduction of Chromite Process as a Clean Ferrochrome Technology by Paktunc, Dogan, Coumans, Jason P., Carter, David, Zagrtdenov, Nail, Duguay, Dominique

“…Direct reduction of chromite (DRC) is a promising alternative process for ferrochrome production with the potential to significantly reduce energy consumption…”
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Immobilization of P by oxidation of Fe(II) ions leading to nanoparticle formation and aggregation by Châtellier, Xavier, Grybos, Malgorzata, Abdelmoula, Mustapha, Kemner, Kenneth M., Leppard, Gary G., Mustin, Christian, West, M. Marcia, Paktunc, Dogan

“…•We oxidize Fe(II) ions at pH 6.0 in permanently oxic conditions.•Syntheses are performed at P/Fe ratios ranging from 0 to 3.•For P/Fe=0, lepidocrocite,…”
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Speciation and Characterization of Arsenic in Ketza River Mine Tailings Using X-ray Absorption Spectroscopy by Paktunc, Dogan, Foster, Andrea, Laflamme, Gilles

“…Ketza River mine tailings deposited underwater and those exposed near the tailings impoundment contain approximately 4 wt % As. Column-leaching tests indicated…”
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Speciation and characterization of arsenic in gold ores and cyanidation tailings using X-ray absorption spectroscopy by Paktunc, Dogan, Foster, Andrea, Heald, Steve, Laflamme, Gilles

“…The knowledge of mineralogy and molecular structure of As is needed to better understand the stability of As in wastes resulting from processing of gold ores…”
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The Use of Hydrogen as a Potential Reductant in the Chromite Smelting Industry by Jamey Davies, Dogan Paktunc, José Juan Ramos-Hernandez, Merete Tangstad, Eli Ringdalen, Johan P. Beukes, Dmitri G. Bessarabov, Stephanus P. Du Preez

“…The chromium (Cr) content of stainless steel originates from recycled scrap and/or ferrochrome (FeCr), which is mainly produced by the carbothermic reduction…”
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The Mode of Incorporation of As(-I) and Se(-I) in Natural Pyrite Revisited by Manceau, Alain, Merkulova, Margarita, Mathon, Olivier, Glatzel, Pieter, Murdzek, Magdalena, Batanova, Valentina, Simionovici, Alexandre, Steinmann, Stephan N, Paktunc, Dogan

“…Pyrite (FeS2) from coal, sedimentary rocks, and hydrothermal ore deposits generally contains hazardous selenium (Se) and arsenic (As) that are released in…”
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Mobilization of arsenic from mine tailings through reductive dissolution of goethite influenced by organic cover by Paktunc, Dogan

“…[Display omitted] •Reductive dissolution of goethite influenced by biosolids caused As reduction.•As mobilization up to ∼14mg/L as As3+ species from…”
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Phase transformations in the system Fe-AsO4-SO4 and the structure of amorphous ferric arsenate; implications for arsenic stabilization in mine drainage and industrial effluents by Paktunc, Dogan

“…The need for improved understanding of the phase relationship in the system Fe-AsO4-SO4 involving ferric arsenate, scorodite, and ferrihydrite motivated a…”
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MODAN—a computer program for estimating mineral quantities based on bulk composition: windows version by Dogan Paktunc, A

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Phase Transformations In the System Fe–AsO 4 –SO 4 and the Structure Of Amorphous Ferric Arsenate: Implications For Arsenic Stabilization In Mine Drainage and Industrial Effluents by Paktunc, Dogan

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Cr(VI) formation in ferrochrome-smelter dusts by Berryman, Eleanor J., Paktunc, Dogan

“…Dusts generated during ferrochrome smelting in a pilot-scale DC arc furnace were sampled from the furnace freeboard and from the off-gas handling stream…”
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Comment on “Structural characterization of poorly-crystalline scorodite, iron(III)-arsenate co-precipitates and uranium mill neutralized raffinate solids using X-ray absorption fine structure spectroscopy” by N. Chen, D.T. Jiang, J. Cutler, T. Kotzer, Y.F. Jia, G.P. Demopoulos and J.W. Rowson by Paktunc, Dogan

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Comment on “New Clues to the Local Atomic Structure of Short-Range Ordered Ferric Arsenate from Extended X‑ray Absorption Fine Structure Spectroscopy” by Paktunc, Dogan, Manceau, Alain

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Reductive dissolution of arsenical ferrihydrite by bacteria by Revesz, Erika, Fortin, Danielle, Paktunc, Dogan

“…Mining and metallurgical processing of gold and base metal ores can lead to the release of arsenic into the aqueous environment as a result of the weathering…”
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