SAFETY DATA SHEET THORIUM OXIDE - Tho2 (IMPURITY STANDARD)
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Radiological Significance of Thorium Processing in Manufacturing
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Thermodynamic Properties of Thorium Dioxide from 298 to 1200 Ok
JO URNAL OF RESEARCH of the National Bureau of Standards-A. Physics and Chemistry Vol. 65, No.2, March- April 1961 Thermodynamic Properties of Thorium Dioxide From 298 to 1,200 oK Andrew C. Victor and Thomas B. Douglas (November 26, 1960) As a step in developing new standards of he.at ca l ~ac i ty applicable up to very h~gh temperatures, t he heat content (enthalpy) of thol'lum dlOxldoe, I h02 , relatn:,e to 2~3 K , was accurately measured at ten temperatures from 323 to 1,173 K . A Bunsen 1.ce ca l ol'l~neter and a drop method were used to make t he mea ~ urements on two samples of ":ldely d Iff erent bulk densities. The corresponding heat-capacity values for the hIgher denSIty sample ~re represented within t heir uncertain ty (estimated to be ± 0.3 to 0.5 %) by the followlI1g empirical equation 1 (cal mole- I deg- I at T OK) : C ~ = 17 . 057 + 1 8. 06 ( 10 -4) T - 2.5166 (1 05)/1'2 At 298 oK t his equation agrees with previously reported low-temperatu.re measurements made with an adiabatic calorimeter. Values of heat content, heat capaelty, entropy, and Gibb's free energy function are tabulated from 298.15 t o 1,200 oK. 1. Introduction measll remen ts arc soon to be extended up to ap proximately 1,800 OK. Current practical and theoretical developm~l!ts However, at higher temperatures aluminum oxide have increased the need for accurate heat capaCltlOs is impractical as a heat standard, for it becomes and related thermal properties at high temp ~rature s, increasingly volatile, and melts at approximately yet the values reported for the same mat~nal from 2,300 OK. -
Extraction of Thorium Oxide from Monazite Ore
University of Tennessee, Knoxville TRACE: Tennessee Research and Creative Exchange Supervised Undergraduate Student Research Chancellor’s Honors Program Projects and Creative Work 5-2019 Extraction of Thorium Oxide from Monazite Ore Makalee Ruch University of Tennessee, Knoxville, [email protected] Chloe Frame University of Tennessee, Knoxville Molly Landon University of Tennessee, Knoxville Ralph Laurel University of Tennessee, Knoxville Annabelle Large University of Tennessee, Knoxville Follow this and additional works at: https://trace.tennessee.edu/utk_chanhonoproj Part of the Environmental Chemistry Commons, Geological Engineering Commons, and the Other Chemical Engineering Commons Recommended Citation Ruch, Makalee; Frame, Chloe; Landon, Molly; Laurel, Ralph; and Large, Annabelle, "Extraction of Thorium Oxide from Monazite Ore" (2019). Chancellor’s Honors Program Projects. https://trace.tennessee.edu/utk_chanhonoproj/2294 This Dissertation/Thesis is brought to you for free and open access by the Supervised Undergraduate Student Research and Creative Work at TRACE: Tennessee Research and Creative Exchange. It has been accepted for inclusion in Chancellor’s Honors Program Projects by an authorized administrator of TRACE: Tennessee Research and Creative Exchange. For more information, please contact [email protected]. Extraction of Thorium Oxide from Monazite Ore Dr. Robert Counce Department of Chemical and Biomolecular Engineering University of Tennessee Chloe Frame Molly Landon Annabel Large Ralph Laurel Makalee Ruch CBE 488: Honors -
Fabrication of Thorium and Thorium Dioxide
Natural Science, 2015, 7, 10-17 Published Online January 2015 in SciRes. http://www.scirp.org/journal/ns http://dx.doi.org/10.4236/ns.2015.71002 Fabrication of Thorium and Thorium Dioxide Balakrishna Palanki (Retired) Nuclear Fuel Complex, Hyderabad, India Email: [email protected] Received 10 November 2014; revised 9 December 2014; accepted 28 December 2014 Copyright © 2015 by author and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract Thorium based nuclear fuel is of immense interest to India by virtue of the abundance of Thorium and relative shortage of Uranium. Thorium metal tubes were being cold drawn using copper as cladding to prevent die seizure. After cold drawing, the copper was removed by dissolution in ni- tric acid. Thorium does not dissolve being passivated by nitric acid. Initially the copper cladding was carried out by inserting copper tubes inside and outside the thorium metal tube. In an inno- vative development, the mechanical cladding with copper was replaced by electroplated copper with a remarkable improvement in thorium tube acceptance rates. Oxalate derived thoria powder was found to require lower compaction pressures compared to ammonium diuranate derived urania powders to attain the same green compact density. However, the green pellets of thoria were fragile and chipped during handling. The strength improved after introducing a ball milling step before compaction and maintaining the green density above the specified value. Alternatively, binders were used later for greater handling strength. Magnesia was conventionally being used as dopant to enhance the sinterability of thoria. -
Separation of Radioactive Elements from Rare Earth Element-Bearing Minerals
metals Review Separation of Radioactive Elements from Rare Earth Element-Bearing Minerals Adrián Carrillo García 1, Mohammad Latifi 1,2, Ahmadreza Amini 1 and Jamal Chaouki 1,* 1 Process Development Advanced Research Lab (PEARL), Chemical Engineering Department, Ecole Polytechnique de Montreal, C.P. 6079, Succ. Centre-ville, Montreal, QC H3C 3A7, Canada; [email protected] (A.C.G.); mohammad.latifi@polymtl.ca (M.L.); [email protected] (A.A.) 2 NeoCtech Corp., Montreal, QC H3G 2N7, Canada * Correspondence: [email protected] Received: 8 October 2020; Accepted: 13 November 2020; Published: 17 November 2020 Abstract: Rare earth elements (REE), originally found in various low-grade deposits in the form of different minerals, are associated with gangues that have similar physicochemical properties. However, the production of REE is attractive due to their numerous applications in advanced materials and new technologies. The presence of the radioactive elements, thorium and uranium, in the REE deposits, is a production challenge. Their separation is crucial to gaining a product with minimum radioactivity in the downstream processes, and to mitigate the environmental and safety issues. In the present study, different techniques for separation of the radioactive elements from REE are reviewed, including leaching, precipitation, solvent extraction, and ion chromatography. In addition, the waste management of the separated radioactive elements is discussed with a particular conclusion that such a waste stream can be -
Aec-Nasa Tech Brief
March 1969 Brief 69-10079 sty C AEC-NASA TECH BRIEF YES AEC-NASA Tech Briefs describe innovations resulting from the research and development program of the U.S. AEC or from AEC-NASA interagency efforts. They are issued to encourage commercial application. Tech Briefs are published by NASA and may be purchased, at 15 cents each, from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. Preparation of Thorium by Magnesium—Zinc Reduction Stirring Motor Ball Valve Stuffing Box Assembly Sampling Port - Water Annulus Graphitar Bearing 1___._Hea t Shields SST Shaft Ta Thermowell Graphite Secondary Crucible Heated Ta Shaft Graphite Pouring Mold Baffled Crucible^v I SST Shell Ta Paddle THORIUM DIOXIDE REDUCTION APPARATUS A technique for the preparation of thorium metal success of the process. by magnesium—zinc reduction of thorium dioxide has The present method for commercial production of been investigated on a laboratory scale. The extent thorium metal involves metallothermic reduction of of reduction was determined as a function of time, thorium tetrafluoride with calcium in the presence of amount and composition of flux, temperature, agita- zinc chloride. However, calcium is expensive as a re- tion, particle size of the oxide, and magnesium con- ductant and the process requires a prior hydro-fluo- centration in the alloy. It was found that the use of rination step. Using magnesium—zinc alloy for the a flux of the proper composition is essential to the reduction of thorium dioxide has potential economic (continued overleaf) This document was prepared under the sponsorship of the Atomic liability resulting from the use of the information contained in this Energy Commission and/or the National Aeronautics and Space document, or warrants that the use of any information, apparatus, Administration. -
United States Patent Office 2,988,421
United States Patent Office Patented June2,988,421 13, 196 heavailaaaar 1 2 contain more than 200 gms. alkali metal and chloride ions 2,988,421 per litre. The following tables show the loss of thorium PROCESS FOR THE SEPARATION OF THORUM and lanthanons under various conditions in the presence WilliamANDRARE Palmer Kemp, EARTHS Shenfield, FROM and MONAZTE James Johnston, 5 of sodium and potassium chloride. Hainault, England, assignors to Thorium Limited, Lon don, England, a corporation of Great Britain NaCl, ThO Ln2O No Drawing. Filed Aug. 20, 1957, Ser. No. 679,126 Acidity gm.fl. loss, loss, Claim priority, application Great Britain Aug. 24, 1956 gm.fl. gm.fl. 9 Claims. (C. 23-145) -ror-rm-m-m------- 10 : 122 This invention relates to a process for separating thori- 4.5 8: um and lanthanon salts from other materials present in : g monazite. The invention is particularly useful in that it 55 i. provides a process for separating salts of thorium and the : 8. lanthanons from phosphate and impurities present in 1655 400 6.65 ground mineral monazite. The term lanthanon in this specification includes the elements with atomic numbers KC ThO Ln2O from 57-71; this group is also known as the rare earth Acidity fi. is is elements. gm.fl. gm.fl. Monazite sand is a mineral phosphate containing thori- .am-m-m-m-m-m-m-wn um and the lanthanon phosphates to the extent of about 38 o' 95-98% by weight. Another source is ground mineral 300 0.005 1.0 monazite which is far less pure than monazite sand and contains only about 75% of the thorium and lanthanon In a preferred form of the process the filtered extract phosphates. -
Chemical Compatibility Storage Group
CHEMICAL SEGREGATION Chemicals are to be segregated into 11 different categories depending on the compatibility of that chemical with other chemicals The Storage Groups are as follows: Group A – Compatible Organic Acids Group B – Compatible Pyrophoric & Water Reactive Materials Group C – Compatible Inorganic Bases Group D – Compatible Organic Acids Group E – Compatible Oxidizers including Peroxides Group F– Compatible Inorganic Acids not including Oxidizers or Combustible Group G – Not Intrinsically Reactive or Flammable or Combustible Group J* – Poison Compressed Gases Group K* – Compatible Explosive or other highly Unstable Material Group L – Non-Reactive Flammable and Combustible, including solvents Group X* – Incompatible with ALL other storage groups The following is a list of chemicals and their compatibility storage codes. This is not a complete list of chemicals, but is provided to give examples of each storage group: Storage Group A 94‐75‐7 2,4‐D (2,4‐Dichlorophenoxyacetic acid) 94‐82‐6 2,4‐DB 609-99-4 3,5-Dinitrosalicylic acid 64‐19‐7 Acetic acid (Flammable liquid @ 102°F avoid alcohols, Amines, ox agents see SDS) 631-61-8 Acetic acid, Ammonium salt (Ammonium acetate) 108-24-7 Acetic anhydride (Flammable liquid @102°F avoid alcohols see SDS) 79‐10‐7 Acrylic acid Peroxide Former 65‐85‐0 Benzoic acid 98‐07‐7 Benzotrichloride 98‐88‐4 Benzoyl chloride 107-92-6 Butyric Acid 115‐28‐6 Chlorendic acid 79‐11‐8 Chloroacetic acid 627‐11‐2 Chloroethyl chloroformate 77‐92‐9 Citric acid 5949-29-1 Citric acid monohydrate 57-00-1 Creatine 20624-25-3 -
Thorium–Ligand Multiple Bonds Via Reductive Deprotection of a Trityl Group† Cite This: Chem
Chemical Science View Article Online EDGE ARTICLE View Journal | View Issue Thorium–ligand multiple bonds via reductive deprotection of a trityl group† Cite this: Chem. Sci.,2015,6, 3891 Danil E. Smiles,a Guang Wu,a Nikolas Kaltsoyannis*b and Trevor W. Hayton*a Reaction of [Th(I)(NR2)3](R¼ SiMe3)(2) with KECPh3 (E ¼ O, S) affords the thorium chalcogenates, [Th(ECPh3)(NR2)3](3,E¼ O; 4,E¼ S), in moderate yields. Reductive deprotection of the trityl group from 3 and 4 by reaction with KC8, in the presence of 18-crown-6, affords the thorium oxo complex, [K(18- Received 7th April 2015 crown-6)][Th(O)(NR ) ](6), and the thorium sulphide complex, [K(18-crown-6)][Th(S)(NR ) ](7), Accepted 30th April 2015 2 3 2 3 respectively. The natural bond orbital and quantum theory of atoms-in-molecules approaches are DOI: 10.1039/c5sc01248a employed to explore the metal–ligand bonding in 6 and 7 and their uranium analogues, and in particular www.rsc.org/chemicalscience the relative roles of the actinide 5f and 6d orbitals. Introduction be rationalized by the higher energy of the thorium 5f orbitals, Creative Commons Attribution-NonCommercial 3.0 Unported Licence. relative to uranium, which likely weakens metal–ligand The study of actinide–ligand multiple bonds has intensied in p-bonding.50 However, this hypothesis requires further veri- recent years due to the need to understand the extent of both f- cation, highlighting the need for new complexes that feature orbital participation and covalency in actinide–ligand thorium–ligand multiple bonds. -