THORIUM phosphate gels were first prepared by Satya Prakash 1 by directly mixing solutions of thorium nitrate and potassium phosphate. A precipitate which is first obtained disappears on shaking and gives rise to a more or less opaque solution. This when kept for some time becomes clear and sets to
Fluoride adsorption from aqueous solution by a hybrid thorium phosphate composite. P. Mishra. Related Papers. Removal of excess fluoride from water using waste residue from alum manufacturing process. By Bhagwan Singh Chandravanshi. Removal of Fluoride from Drinking Water Using Novel Adsorbent Magnesia-Hydroxyapatite.
Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral). Thorium has 6 naturally occurring isotopes. All of these isotopes are unstable (radioactive), but only 232 Th is relatively stable with half-life of 14 billion years, which is comparable to the age of the Earth (~4.5×10 9 years).
The main results led to the thorium phosphate-diphosphate (TPD): Th4(PO4)4P2O7 which can be prepared via wet and dry chemistry routes. Its crystal structure was determined.
Synthesis of triple phosphates type M II LaTh(PO 4) 3.. Solid state synthesis was used for preparation M II LaTh(PO 4) 3.Oxides and salts of the chemically pure class were used as reagents: lanthanum oxide La 2 O 3, bivalent metal nitrates Ca(NO 3) 2, Sr(NO 3) 2, Cd(NO 3) 2, thorium nitrate crystalline hydrate Th(NO 3) 4 ∙5H 2 O and ammonium dehydrogen phosphate NH 4 H 2 PO 4 [].
phosphate, or tin ore is processed. • by living in homes built on soil with high levels of thorium. • by working in the uranium, thorium, tin, and phosphate ... toxicological profiles prepared by ATSDR. Thorium was once thought to cause cancer in mine and mill …
of Thorium Phosphate 113 Removal of Sulfate and Phosphate From Thorium-Rich Filter Cake by Caustic ... The purpose of this investigation was to study the sulfuric acid digestion of raonazite sand, and to prepare a thorium-containing ra^-terial from the resulting solution which .'ould be suitable for further purification by liquid-liquid ...
Novel thorium phosphates, a method for preparing same, and the use thereof for storing radioactive materials, are disclosed. Said novel thorium phosphates are of formulae Th4P6O23 (I) or Th4-x M4x/v P6O23 (III), wherein M is a monovalent, divalent, trivalent or tetravalent cation, v is the state of valency of the cation and is 1, 2, 3 or 4, and x is such that 0 < x
Free Online Library: Thorium (IV) phosphate-polyaniline composite-based hydrophilic membranes for bending actuator application.(Report) by "Polymer Engineering and Science"; Engineering and manufacturing Science and technology, general Actuators Electric properties Materials Composite materials Usage Phosphates Polymerization Polymers
This novel thorium phosphate can be prepared from a thorium compound and a phosphating agent either by a wet process, or by a dry process, provided that use is made of quantities of the thorium compound and the phosphating agent corresponding to a molar ratio Th/P from 1/4 to 2/3.
Abstract Thorium phosphate has been prepared by mixing solutions of 0.1 M Th(NO3)4·4H2O in 1 M nitric acid and 1 M phosphoric acid. Four different thorium phosphate materials were obtained under …
This paper describes the synthesis of some thorium phosphate compounds with different Th/P ratio (1/2, 2/3 and 3/4) by a spray pyrolysis technique. The so-prepared rough compounds were annealed at different temperatures for 2 h and then analyzed by mainly X-ray diffraction on …
In conclusion, we show here that it is Binding of Th(1)4+ (15 mM) to diethyl phosphate (10 mM), pH feasible to prepare a Th(IV) complex of a neutral macrocycle 6.90, 0.10 M Hepes buffer at 22 °C, is complete within the 90 which is highly resistant to dissociation in neutral aqueous s it takes to record the 31P NMR spectrum.
The conventional oxalate method for precipitating thorium and the rare earth elements in acid solution exhibits definite solubilities of these elements. The present work was undertaken to establish conditions overcoming these solubilities and to find optimum conditions for precipitating thorium and the rare earth elements as hydroxides and sebacates.
The invention relates to a process for the preparation of a product based on a phosphate of at least one element M(IV), for example of thorium and/or of actinide(IV)(s). This process comprises the following stages: a) mixing a solution of thorium(IV) and/or of at least one actinide(IV) with a phosphoric acid solution in amounts such that the molar ratio PO 4 M ( IV ) is from 1.4 to 2 ...
Prepared by Madan M. Singh [(703) 648–4916, [email protected]] THORIUM (Data in kilograms, gross weight, unless otherwise noted) Domestic Production and Use: The world's primary source of thorium is the rare-earth and thorium phosphate mineral monazite. In 2020, monazite may have been produced as a separated concentrate or included as an
This paper describes the synthesis of some thorium phosphate compounds with different Th/P ratio (1/2, 2/3 and 3/4) by a spray pyrolysis technique. The so-prepared rough compounds were annealed at different temperatures for 2 h and then analyzed by mainly X-ray diffraction on …
Both structures also represent the first occurrences of a fluorinated alkali thorium phosphate material. Graphical Abstract. Two novel fluorinated alkali thorium phosphate structures, K 3 Th 2 (PO 4) 3 F 2 and RbThPO 4 F 2, were prepared by hydrothermal synthesis as potential radioactive waste storage materials.
Thorium Phosphate-Diphosphate/Monazite Based Ceramics Nicolas Clavier1, Nicolas Dacheux1, ... prepared in the powder and in the pellet form. A good chemical compatibility was found between TPD and monazite since the properties of both phosphates were kept in these composites.
Process for the preparation of thorium phosphate/diphosphate of formula Th 4 (PO 4) 4 P 2 O 7, wherein a product based on thorium(IV) phosphate is prepared by carrying out the process according to claim 1 using, in stage a), a solution comprising thorium and phosphoric acid and wherein the product based on thorium(IV) phosphate is subjected to ...
Chemical conditions for thorium phosphate gel preparation have been determined. The transparency is of good optical quality and the gel is very stable for a long time. Under drying condition, this gel can give rise to the xerogel which is still transparent. We can also prepare this xerogel by simple evaporation at room temperature of a very concentrated solution of thorium phosphate.
rium phosphate prepared under similar conditions. It appears to be a promising ion exchanger having good thermal stability possibly due to a mutual interaction of thorium phosphate and cellulose acetate, resu lting into the chemical bonds formation between the atoms originated from both phases. Acknowledgement
The triple‐layered membrane is composed of thorium(IV) phosphate (ThP) inorganic cation exchanger layer in the middle section, two layers of polyaniline deposited through in situ polymerization and finally Pt electrode layers on both the surfaces on the outer section. The water uptake capacity of the ThP‐PANI composite polymer membrane was ...
Several compositions of thorium-uranium (IV) phosphate-hydrogenphosphate hydrate (U x/2 Th 2-x/2 (PO 4 ) 2 (HPO 4 ) · H 2 O, TUPHPH) were prepating from actinides chloride solutions and concentrated phosphoric acid. The experimental synthesis parameters were optimized in order to get the quantitative precipitation of the cations and a good crystallization state.
Thorium phosphate has been prepared by mixing solutions of 0.1 M Th(NO3)4·4H2O in 1 M nitric acid and 1 M phosphoric acid. Four different thorium phosphate materials were obtained under various ...
THORIUM [Data in kilograms gross weight unless otherwise noted] Domestic Production and Use: The world's primary source of thorium is the rare-earth and thorium phosphate mineral monazite. In 2019, monazite may have been produced as a separated concentrate or included as an ... Prepared by Madan M. Singh [(703) 648–4916, [email protected]] 170.
Revised Manuscript Received October 21, 1997X Thorium phosphate-diphosphate, Th4(PO4)4P2O7, is obtained, at high temperature (800- 1250 °C), for a given ratio r ) PO4/Th equal to 3/2 from a thorium compound and a phosphating reactant whatever the chemical conditions.
The most common source of thorium is the rare earth phosphate mineral, monazite, which contains up to about 12% thorium phosphate, but 6-7% on average. Monazite is found in igneous and other rocks but the richest concentrations are in placer deposits, concentrated by …
Thorium phosphate papers have been prepared by treatment with thorium nitrate and phosphoric acid solutions. Several metal ions have been chromatographed on thorium phosphate paper. The effect of pH on R/sub F/ values has been investigated. Some useful analytical s
Thorium is a weakly radioactive metallic chemical element with the symbol Th and atomic number 90. Thorium is silvery and tarnishes black when it is exposed to air, forming thorium dioxide; it is moderately soft, malleable, and has a high melting point.Thorium is an electropositive actinide whose chemistry is dominated by the +4 oxidation state; it is quite reactive and can ignite in air when ...
