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Description: A laboratory study of a gelatin headend process for feed from silicon- containing aluminum fuels and plant salvage solutions is described. The optimum conditions for the gelatin treatment of fuel solutions were to boil a 0.1 to 0.5N nitric acid solution with 100 milligrams of gelatin per liter for 30 minutes. This treatment improved filtration rates and decreased the surface activity of the filtrate for TBP extraction. A number of possible flowsheets for fuel solutions are presented using gelatin treatment and filtration. An adequate treatment was not found for salvage solutions of unknown composition because a gelatin dosage which was satisfactory for all solutions could not be selected. The optimum treatment for a salvage solution which was grossly contaminated with zirconium, soluble and colloidal silica, and dibutyl phosphate was to boil a 1N acid deficient solution with 600 milligrams of gelatin per liter, filter, and use a Hexone extraction system. A silicic colloid in fuel processing solutions was characterized as a surface active material by this study. (auth)
Date: February 1, 1959
Creator: Newby, B.J. & Paige, B.E.
Partner: UNT Libraries Government Documents Department


Description: A study of the equiibrium sorption isotherms and rates of U sorption on Dowex 21K is in progress. Data which show the effects of uranium concentration in solution on resin loading are presented Fuel reprocessing experiments are reported in which efforts were made to reduce Cl- in Darex dissolver solution to < 350 ppm for the extraction phase. The best method of Cl/sup -/ reduction appears to be operation with a down draft condenser and an air sparge. A check- out dissolution min in the 6 in. glass dissolver with a prototype APPR fuel element is reported, and data on dissolution time and composition of reacted products are given. Data on filtration rates for Darex solutions expected in large-scale operations are tabulated, and graphs illustrating the effects of pressure drop and filter aids on filtering rates are presented. Tests on washing U from filter cakes indicate that U can be removed to any desired level. Viscosity, density. and boiling points as a function of temperature or pressure were determined for two Darex solvent extraction feed solutions; data are presented grahically, and results of chemical analyses are tabuated. Demonstation runs for Sulfex and Zirflex dejacketing flowsheets were made. Results indicate that parts of the Sulfex flowsheet map have to be changed to prevent core losses from fluoride contamination. Results from the Zirflex demonstration are being compiled. Design of the SRE decanning device was completed and sub mitted to vendors for bids; also the design of a prototype fuel bundle to serve as an inexpensive substitute in chopping and leaching studies is reported. Preliminary shearing studies with the 120 ton hydraulic Manco shear indicate that its usefulness is limited, and criteria for a large shear for spent fuel bundles are being written. Darex-type solvent extraction studies using hexane are reported, and U ...
Date: May 1, 1959
Creator: Shank, E M
Partner: UNT Libraries Government Documents Department


Description: Thorium is readily extracted by a solution of tri-noctylphosphine oxide in cyclohexane from either acidic nitrate or chloride solutions. The maximum extraction coefficient in a nitrate medium is 380 as compared to 1300 for a chloride solution. In nitrate media the extraction coefficient is relativelv unaffected by changes in the anion concentration. In chloride media the coefficient varies directly with increasing chloride concentration, i.e., from about 0.4 in one molar chloride to the maximum in 7 to 10 molar. The acid concentration should be at least one molar. Thorium is not appreciably extracted from sulfate solutions. The extraction coefficient is of the order of 0.3. The addition of nitrate or chloride increases the coefficient sufficiently so that essentially 99% of the thorium can be extracted in a single equilibration. In perchlolate systems the extractlon is most efficient in one molar acid. The maximum (The above was unscabble material)
Date: November 20, 1958
Creator: Ross, W.J. & White, J.C.
Partner: UNT Libraries Government Documents Department


Description: A study was made of the performance of an orifice plate pulse column which is essentially a spray column containing internal constrictions in the form of orifices. The chemical system studied was acetic acid-waterhexone, and the variables considered were pulse frequency, throughput, phase continuity, and direction of solute transfer. For comparison purposes, several runs were made with a conventional spray column. Curves are presented showing the effect of the column variables on the column efficiency (HTU). The trends observed are explained as being due principally to the competing effects of the area for mass transfer and back-mixing. Photographs of a typical column section show qualitatively the effect of the important column variables. (auth)
Date: August 23, 1954
Creator: O'Brien, D.C.
Partner: UNT Libraries Government Documents Department

A Low-Temperature Calorimetric Cryostat

Description: A low temperature adiabatic cryostat for determining precise calorimetric data has been described. The accuracy of the data produced by this apparatus has been established by measuring the thermal properties of n-hexane up to 300 deg K. These data agree with available precise data, in general, to within 0.2%. The precision of the heat capacity measurements is, for the most part, better than 0.1%. (auth)
Date: January 20, 1950
Creator: Oliver, G.D.; Grisard, J.W. & Anderson, V.E.
Partner: UNT Libraries Government Documents Department


Description: Progress is reported on the gross solubility of U in digestions of Mallinokrodt feed materials, studies of variables affecting U purity in a TBP hexane extraction cycle, low-acid flowsheet for TBP--hexane extraction process based on a 440 g U/liter in lM HNO/sub 3/ digest liquor, hacking studies in the pilot plant pumperdecanter system, recovery of U from residues from the dingot process, lowering the H level in dingot metal, forging of dingot bar stock, dingot extrusion, fubrication of UO/sub 2/ fuel elements, and the determination of H content of derby and ingot metal. (W.L.H.)
Date: May 1, 1957
Creator: Kuhlman, N. ed.
Partner: UNT Libraries Government Documents Department


Description: Efficiency of the pilot plant pumper-decanters was greatly improved by the maintenance of interfaccs. The low efficiency of the D-3 pumper-decanter in the plant could be substantially raised by an interface to prevent backmixing. A review of refinery performance, based on a correlation of wash raffinate density with extract uranium saturation showed that high-thorium product resulted from low extract saturation. Tributyl phosphate recovery by hexane stripping of raffinate can be greatly improved through the use of a pamper-decanter in place of the present open column. The pilot plant fluid-bed denitrator has been operated at production rates as high as 500 lb UO/sub 3/hr-sq ft using hlgh feed concentrations. Correlations of previous particle size and heat transfer data are presented. A pilot plant fluid-bed reduction reactor with a tapered internal mandrel has been placed in service. The equipment has performed well in preliminary runs. Equipment to convent low concentration to 38% HF by distillation has been installed. Runs have been made in the green salt reactors in order to simulate the conditions whereby the 38% HF will be utilized. These runs demonstrate the ability to produce high-quality UF/sub 4/ utilizing 38% HF to the Air reactor tube. Laboratory analysis of green salt produced at Port Hope, Canada, indicated the green salt to be approximately comparable a Weldon Spring material, with the exception of hydrogen content, which was about twice the level found in Weldon Spring green salt. Metal from 3300-lb dingots, produced from this green salt by the long-soak technique, had hydrogen levels of 3.9 ppm and 3.4 ppm, which are higher than is normally found in metal produced by the long-soak technique. (auth)
Date: August 1, 1959
Creator: Shepardson, J.U. & Nelson, J.A. eds.
Partner: UNT Libraries Government Documents Department


Description: Data are presented from the following studies: the radiation chemistry of pepsin, gelatin, methanol, benzene, and hexanes; the effects of irradiation of the pituitary in advanced cancer using high-energy particles from the 184-inch cyclotron; applications of ion beams in biological studies; the metabolism of strontium-90 and its relation to calcium metabolism in rats; hematological effects of low-level radiation doses in man; the influence of diet on serum lipoproteins; development of simplified methods for the analysis of blood serum for lipid content; tracer studies employing iron59 of red blood cell production and destruction and iron metabolism in a wide variety of blood disorders; tracer studies on heart function and blood circulation employing I/sup 131/; applications of C/sup 14/ in studies of leukocyte formation from which it was concluded that peripheral neutrophils have a 2-day life span, large lyphocytes a life span of 2 to 3 days, and small lyphocytes a life span of between 8 and 14 days; tracer studies employing P/sup 32/ in studies of the phagocytic action of cells of the reticuloendothelial system; factors regulating the volume of the body fluids; and development of a method for determining estrogen concentration in urine. Radiation protection activities are summarized. Lists are included of reports issued and papers published during the period. (For preceding period see UCRL-8031.J (C.H.)
Date: April 25, 1958
Partner: UNT Libraries Government Documents Department


Description: The purpose of this study was to determine the effect of gamma radiation on the direct sulfochlorination of hydrocarbons and nitrobenzene. The radiation source consisted of spent uranium fuel elements, providing a gamma radiation intensity up to 2.5 x 10/sup 6/ roentgen/ hour. The sulfochloriuation studies were carried out either with SO/sub 2/Cl/sub 2/ or with gaseous mixtures of SO/ sub 2/ aud Cl/sub 2/. Attempts to sulfuochlorinate nitrobenzene and benzene were unsuccessful. There was no detectable reaction in the case of nitrobenzene, while the reaction with benzene produced only chlorinated products, up to the full addition product 1,2,3,4,5,6-hexachlorocyclohexane. Liquid cyclohexane reacted with SO/sub 2/ and Cl/sub 2/ in the presence of gamma radiation to give very high yields of cyclohexanesullonyl chloride, and to a smaller extent chlorocyclohexane and cyclohexanedisulfonyl chloride. The leugth of the chemical chain reaction induced by gamma radiation was estimated at over 2 x 10/sup 5/, and the radiochemical yield G was greater than 10/sup 6/. Sulfochlorination was the predominant reaction but at lower radiation intensities and for SO/sub 2/Cl/ sub 2/ ratios lower than unity, chlorination was found to exceed sulfochlorinatiou. Within a temperature range of 11.5 to 40.0 deg C, the selectivity of the reaction was independent of temperature. For a total gas flow rate of 1.9 l/min per liter C/sub 6/H/sub 12/ and SO/sub 2/Cl/sub 2/ ratios of 2/ 1, the rate of conver sion to C/sub 6/H/sub 11/SO/sub 2/Cl was proportional to the square root of the absorbed radiation dose up to a dose rate of 40 rad/min, but became independent of dose rate above 400 rad/min. Under these conditions, the conversion rate was 0.025 g-moles C/sub 6/H/sub 11/SO/sub 2/Cl/ (l) (min). A basic plant design was developed for the contiuuous sulfo chlorination of cyclohexame initiated by gamma radiation. Tbe economics of ...
Date: June 1, 1958
Creator: Schneider, A.
Partner: UNT Libraries Government Documents Department


Description: A method for the direct determination of uranium in a cyclohexane solution of tri-n-octylphosphine oxide (TOPO) is presented. The adduct, UO/sub 2/ Cl/sub 2/ x 2TOPO, that is formed when uranium(VI) is extracted from hydrochloric acid solutions by tri-n-octylphosphine oxide absorbs light in the ultraviolet region. This absorbance is measured at 230 m mu vs. a TOPO-cyclohexane solution that was contacted with hydrochloric acid of the same concentration as that in the test aliquot. The molar absorbance index is 5500. The method is not selective; of the elements that are extracted by TOPO from hydrochloric acid, iron(III), zirconium, molybdenum, tin and thorium, only thorium can be tolerated. (auth)
Date: April 21, 1959
Creator: White, J. C.
Partner: UNT Libraries Government Documents Department

Hexone Extraction-Coulometric Titration of Uranium

Description: Samples containing 5 to 10 mg of uranium were extracted with hexone (methyl isobutyl ketone) and titrated coulometrically in sulfate media. Relative standard deviations of 0.43% for samples containing 5 mg and 0.56% for 10 mg were determined by precision studies. (auth)
Date: June 22, 1959
Creator: Blevins, E. L.
Partner: UNT Libraries Government Documents Department

Some Physical and Chemical Properties of Scandium and the Rare Earths

Description: Conductances, densities, partial molal volumes, solubilities, and transference numbers were measured for scandium chloride, nitrate, and perchlorate. The stability constants of the chelates formed by the rare earths and scandium with ME(l,2-bis- STA2-di(carboxymethyl)aminoethoxy!ethane) and DE(2,2 -bis- STAdi(carboxymethyllaminoldiethyl ether) were measured polarographically. In addition, the stability constants of the scandium chelates of HEDTA (N -hydroxyethyl)-ethylenediamine-N,N,N -triacetic acid), EDTA- (ethylenediamine-N,N,N ,N -tetraacetic acid), DCTA (l,2-diaminocyclohexane-N,N,N ,N -tetraacetic acid), and DE TPA ((carboxymethyl)-bis- (2-di- (carboxymethyl)aminoethyllamine) were also measured. (auth)
Date: July 1, 1959
Creator: Hiller, M. A. & Powell, J. E.
Partner: UNT Libraries Government Documents Department