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A Comprehensive Study of the Solubility, Thermochemistry, Ion Exchange, and Precipitation Kinetics of NO3 Cancrinite and NO3 Sodalite (Project No.: 81959)

Description: NO3 cancrinite and NO3 sodalite haves been found as a common sodium alumino-silicate forming in strongly caustic and alkaline aqueous solutions associated with radioactive High Level Waste (HLW) stored in many underground tanks and also in nuclear waste treatment facilities such as the Savannah River Site (SRS). The appearance of these phases have created very expensive problems in waste treatment plants by fouling process evaporators in the SRS waste processing facility. Therefore, in order to… more
Date: June 1, 2004
Creator: Colon, Carlos F. Jove; Navrotsky, Alexandra; Krumhansl, James L.; Nyman, May & Liu, Qingyuan
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Characterization of UOP IONSIV IE-911

Description: As a participating national lab in the inter-institutional effort to resolve performance issues of the non-elutable ion exchange technology for Cs extraction, they have carried out a series of characterization studies of UOP IONSIV{reg_sign} IE-911 and its component parts. IE-911 is a bound form (zirconium hydroxide-binder) of crystalline silicotitanate (CST) ion exchanger. The crystalline silicotitanate removes Cs from solutions by selective ion exchange. The performance issues of primary conc… more
Date: June 1, 2001
Creator: NYMAN, MAY D.; NENOFF, TINA M. & HEADLEY, THOMAS J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Technetium Eluate Evaporation Solubility and Precipitation Performance

Description: The baseline flowsheet for low activity waste in the Hanford River Protection Project Waste Treatment Plant includes pretreatment of supernatant by removing technetium using ion exchange. The primary purpose of this work is validation of the predictions of the Tc eluate computer model.
Date: June 17, 2003
Creator: Johnson, J. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Numerical Modeling of Coupled Variably-Saturated Fluid Flow and Reactive Transport with Fast and Slow Chemical Reactions

Description: The couplings among chemical reaction rates, advective and diffusive transport in fractured media or soils, and changes in hydraulic properties due to precipitation and dissolution within fractures and in rock matrix are important for both nuclear waste disposal and remediation of contaminated sites. This paper describes the development and application of LEHGC2.0, a mechanistically-based numerical model for simulation of coupled fluid flow and reactive chemical transport including both fast an… more
Date: September 20, 1999
Creator: LI, MING-HSU; SIEGEL, MALCOLM D. & YEH, GOUR-TSYH (GEORGE)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Results of Research Concerning Phosphorus-32 in Reactor Effluent

Description: Several processes for reducing the concentration of radioisotopes in reactor effluent water have been developed and evaluated. Application of the high alum process for the treatment of reactor cooling water has resulted in a reduction in p{sup 32} concentration by a factor of 2.3 from pre-1961 levels. An additional factor of 2 could be obtained by subtituting nitrate salts for the sulfates currently employed in the process. Addition of sodium silicate to the cooling water demonstrated to provid… more
Date: November 1, 1965
Creator: Silker, W. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Cesium cobaltdicarbollide-solubility, precipitation, and reactivity in basic aqueous solution

Description: The title compound, Cs{sup +}[Co((3)-1,2-C{sub 2}B{sub 9}H{sub 11}){sub 2}]{sup {minus}}(CsCDC), was precipitated with a NaCDC solution from solutions containing CsCl. The reaction was followed by measuring loss of light intensity as the precipitate formed. The [Cs{sup +}] and [CDC{sup {minus}}] at the point of precipitation were estimated and approximate values of the K{sub sp} for CsCDC determined at room temperature: 8 {times} 10{sup {minus}6} (water), 7 {times} 10{sup {minus}6} (1 M NaOH), … more
Date: December 31, 1994
Creator: McCabe, D. J.; Fanning, J. C.; Hugg, L. A.; Smith, W. A.; Terrell, A. S.; Yasinsac, L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Late wash cross-flow filter organic balance

Description: A recent DOE-Savannah River review of the results and data from the Late Washing Crossflow Fitter assessment identified the fate of biphenyl as a concern in the Late Washing material balance. The concern arose because after the late washing operation only about 40% of the biphenyl remained in the irradiated precipitate and analyses of the spent wash water stream did not account for the missing biphenyl [2]. This document summarizes the results of subsequent filtration studies on the behavior an… more
Date: November 16, 1992
Creator: Baich, M. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SMALL-SCALE TESTING OF PLUTONIUM (IV) OXALATE PRECIPITATION AND CALCINATION TO PLUTONIUM OXIDE TO SUPPORT THE MOX FEED MISSION

Description: The H-Canyon facility will be used to dissolve Pu metal for subsequent purification and conversion to plutonium dioxide (PuO{sub 2}) using Phase II of HB-Line. To support the new mission, SRNL conducted a series of experiments to produce calcined plutonium (Pu) oxide and measure the physical properties and water adsorption of that material. This data will help define the process operating conditions and material handling steps for HB-Line. An anion exchange column experiment produced 1.4 L of a… more
Date: June 25, 2012
Creator: Crowder, M.; Pierce, R.; Scogin, J.; Daniel, G. & King, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Conversion of Plutonium Nitrate to Plutonium Tetrafluoride via the Continuous Oxalate-Fluoride Method

Description: A description is given of the process and equipment for the continuous conversion of plutonium nitrate to tetrafluoride powder for reduction to Pu metal. The conversion involves oxalate precipitation, filtration, calcination, and hydrofluorination. Typical results are described; the product is a free-flowing PuF/sub 4/ with a high degree of separation from impurities. (D.L.C.)
Date: January 25, 1963
Creator: Crocker, H. W. & Hopkins, H. H., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Protection of Graphite by Impregnation. Quarterly Progress Report No. 3 for September 1-November 30, 1960. Vitro Job 2195

Description: The hypothesis that sample resistivity is the controlling factor in electrokinetic impregnation was substantiated. Experiments show that dense clay- bonded silicon carbide can be impregnated beneath the surface pores whereas only surface pore impregnation is achieved with both dense and porous graphite. The resistivity of the materials differ by a factor of about 1O/sup 10/. Although deep penetration of the substrate by the particles of the coating system is not achieved during deposition, ther… more
Date: December 15, 1960
Creator: Ortner, M. H. & Klach, S. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Emission, Dispersion, Transformation, and Deposition of Asian Particulates Over the Western Pacific Ocean

Description: In this project we developed and applied a coupled three-dimensional meteorology/chemistry/microphysics model to study the patterns of aerosol dispersion and deposition in the western Pacific area; carried out a series of detailed regional aerosol simulations to test the ability of models to treat emission, dispersion and removal processes prior to long-range transport; calculated and analyzed trajectories that originate in Asian dust source regions and reach the Pacific Basin; performed detail… more
Date: February 28, 2005
Creator: Turco, Richard P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Impact of phase stability on the corrosion behavior of the austenitic candidate materials for NNWSI [Nevada Nuclear Waste Storage Investigations]

Description: The Nuclear Waste Management Program at Lawrence Livermore National Laboratory is responsible for the development of the waste package design to meet the Nuclear Regulatory Commission licensing requirements for the Nevada Nuclear Waste Storage Investigations (NNWSI) Project. The metallic container component of the waste package is required to assist in providing substantially complete containment of the waste for a period of up to 1000 years. Long term phase stability of the austenitic candidat… more
Date: October 1, 1987
Creator: Bullen, D. B.; Gdowski, G. E. & McCright, R. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development and Evaluation of Mn oxide-coated Composite Adsorbent for the Removal and Recovery of Heavy Metals From Coal Processing Wastewater. Final Report, December 1995

Description: The overall objective of this research was to evaluate a Mn oxide-coated granular activated carbon (MnGAC) for the removal and recovery of metals from wastewaters. The composite adsorbent was prepared by coating M-n-oxide onto granular activated carbon. Three coating methods (adsorption, precipitation, and dry oxidation) were developed and studied in this research. The adsorbent (MnTOG) prepared by a dry oxidation method had the highest Cu(II) adsorption capacity of the three synthesis methods.… more
Date: December 31, 1995
Creator: Fan, Huan Jung & Anderson, Paul R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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On the Influence of Dispersoids on the Particle Stimulated Nucleation of Recrystallization in an Al-Fe-Si Model Alloy

Description: The recrystallization of Al-alloys is controlled by precipitates. Whereas large particles generally promote recrystallization by particle stimulated nucleation, finely dispersed precipitates - either already present in the as-deformed state or precipitating during the recrystallization anneal - are known to strongly retard recrystallization. It was the aim of the present study to elucidate these concurring effects of large particles and small dispersoids on recrystallization in a ternary Al-Fe-… more
Date: December 31, 1997
Creator: Engler, O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Interstitial-Phase Precipitation in Iron-Base Alloys: A Comparative Study

Description: Recent developments have elucidated the atomistic mechanisms of precipitation of interstitial elements in simple alloy systems. However, in the more technologically important iron base alloys, interstitial phase precipitation is generally not well understood. The present experimental study was therefore designed to test the applicability of these concepts to more complex ferrous alloys. Hence, a comparative study was made of interstitial phase precipitation in ferritic Fe-Si-C and in austenitic… more
Date: June 1, 1982
Creator: Pelton, Alan Roy
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Pre-precipitation phenomena at grain boundaries

Description: A high spatial resolution study of the behavior of Zn solute in Al bicrystals has been conducted using x-ray energy-dispersive spectroscopy (EDS) in a TEM/STEM instrument. Specimens subjected to short annealing cycles are found to exhibit a periodic distribution of Zn along the grain boundary plane prior to the appearance of any evidence suggesting precipitation has occurred. The periodicity of the segregation event bears no exact relationship with the transition lattice models of boundary stru… more
Date: March 1, 1982
Creator: Briceno-Valero, J. & Gronsky, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Exploring Potential U.S. Switchgrass Production for Lignocellulosic Ethanol

Description: In response to concerns about oil dependency and the contributions of fossil fuel use to climatic change, the U.S. Department of Energy has begun a research initiative to make 20% of motor fuels biofuel based in 10 years, and make 30% of fuels bio-based by 2030. Fundamental to this objective is developing an understanding of feedstock dynamics of crops suitable for cellulosic ethanol production. This report focuses on switchgrass, reviewing the existing literature from field trials across the U… more
Date: August 1, 2008
Creator: Gunderson, Carla A; Davis, Ethan; Jager, Yetta; West, Tristram O.; Perlack, Robert D; Brandt, Craig C et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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RETADD-II: a long-range atmospheric trajectory model with consistent treatment of deposition loss and species growth and decay

Description: A versatile model is described which estimates long-range atmospheric dispersion based on plume trajectories. This model allows the treatment of the dispersal from a source at an arbitrary height while taking account of plume depletion by dry and wet deposition together with the decay of material to successor species. The plume depletion, decay and growth equations are solved in an efficient manner which can accommodate up to eight pollutants (i.e., a parent and seven serial decay products). Th… more
Date: August 1, 1984
Creator: Murphy, B. D.; Ohr, S. Y. & Begovich, C. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Technetium-99 in SRP high-level waste and saltstone

Description: Analyses of sludge and soluble waste samples and the inventory of sludge and soluble waste have been used to estimate the concentration of technetium-99 (Tc-99) in sludge solids and soluble waste. These data were also used to establish if the source term assumptions for Tc-99 in the Defense waste Processing Facility (DWPF) flowsheet are accurate and determine the fraction of the Tc-99 inventory in the waste that is soluble. This analysis was needed to establish if the present basis for decontam… more
Date: February 24, 1984
Creator: Fowler, J. R.; Hamm, B. A. & Cook, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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