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12%Scandium and thorium sorption from simulated uranium leach liquors by phosphorous containing ion exchange resins was studied. Increase of thorium concentration resulted in a decrease of scandium sorption by 26–65%. Tulsion CH 93 resin was chosen for Sc separation from uranium leach liquors. It was shown that 180 g L−1 Na2CO3 allowed for elution 94.1% of Sc and …
به خواندن ادامه دهید
Scandium and thorium sorption from simulated uranium leach liquors by phosphorous containing ion exchange resins was studied. Increase of thorium concentration resulted in a decrease of scandium sorption by 26–65%. Tulsion CH 93 resin was chosen for Sc separation from uranium leach liquors. It was shown that 180 g L−1 Na2CO3 allowed for elution 94.1% of Sc and 98.9% of Th in …
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The separation of rare metals from the ores and commercially available compounds is an important issue due to the need of their high purity in advanced materials and devices. Important examples of two highly important elements that co-exist in the ores are scandium and thorium. Scandium containing ores and c
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Scandium containing ores and consequently also commercially available scandium compounds often contain traces of thorium which is very difficult to separate. We used graphene oxide for the selective sorption of thorium ions from scandium and thorium mixtures originating from the mined ores as well as from commercially available scandium salts.
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The paper outlines the development of a solvent extraction process for the recovery of scandium, yttrium, thorium, and heavy lanthanides from waste sulphate liquor at the Port Pirie uranium treatment plant. A summary is given of known solvents for these elements, including the recently developed alkyl-phosphoric acid esters which are applicable to sulphate solutions.A kerosene solution of di ...
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THE reagent arsenazo III, produced1 in 1959, is widely used at the present time for determining thorium,1-10 uranium,1'2'11"13 zirconium,2'"-16 hafnium,17 pro- tactinium,18 scandium,19'20 neptunium,21'22 and the rare earth elements.19 Some of the papers mentioned,3'*'6'8'13'14 having been considered in a previous review2 are not discussed in ...
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Scandium from the organic phase was stripped with 0.2 M hydrochloric acid and was determined photometrically as its alizarin red S complex at 520 nm. It was possible to separate scandium from a large number of elements such as yttrium, lanthanum, thorium, uranium, lead, etc. with which it is associated in minerals.
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Interaction of the Tris (Tropolonato) Scandium (III) Complex With Bidentate Ligands 26 IV. RESULTS AND DISCUSSION 27 A. Uranium(VI) Tropolonate Complexes 27 B. Thorium(IV) Tropolonate Complexes 41 C. Scandium(III) Tropolonate Complexes 49 D. Suggestions for Further Work 56 V. SUMMARY 57 VI. APPENDIX 59 VII. REFERENCES 70 (vi) .,.
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elements (REEs), thorium, uranium, scandium and yttrium. The measurements were carried out for each of the following analytical isotopes: 139 La, 140 Ce, 141 Pr, 143Nd, 147 Sm, 151Eu, 160 Gd, 159 Tb, 163 Dy, 165 Ho, 167Er, 169 Tm, 174 Yb, 175 Lu, 45 Sc, 89 Y, 232 Th and 238 U. Recovery percentage values found in these certified samples varied
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The separation of uranium, iron and scandium is achieved by the following process wherein a material containing these values is dissolved in mineral acid to form an aqueous solution, thereafter, an iminodiacetic acid cationic ion exchange resin is used to retain a major portion of the scandium and uranium. A raffinate containing the iron is formed.
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12%The extraction of scandium, uranium, and thorium with tributyl phosphate, trioctyl phosphine oxide (TOPO), Cyanex 923, and others was studied in sufficient detail [10, 11]. Extensive experience in the isolation of radioactive impurities from nitric acid solutions was accumulated in the preparation of rare-earth concentrates.
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This construction gives the impression that thorium is the second member of a series starting with actinium in the scandium group, just as cerium is the second member of a series starting with ...
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Scandium and thorium sorption from simulated uranium leach liquors by phosphorous containing ion exchange resins was studied. Increase of thorium concentration resulted in a decrease of scandium sorption by 26–65%. Tulsion CH 93 resin was chosen for Sc separation from uranium leach liquors.
به خواندن ادامه دهید
The extraction of scandium, uranium, and thorium with tributyl phosphate, trioctyl phosphine oxide (TOPO), Cyanex 923, and others was studied in sufficient detail [10, 11]. Extensive experience in the isolation of radioactive impurities from nitric acid solutions was accumulated in the preparation of rare-earth concentrates.
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As a result, scandium was separated from thorium, titanium, zirconium and hafnium by 3–15 stages of counter-current stripping and from uranium by 6 stages of fractional stripping (Odekirk, 1996). The main disadvantage of this process is the use of HF solutions in large amounts, which leads to environmental risks.
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The Chromatographic behaviour of scandium, yttrium, the rare earths, thorium and uranium(VI) in dioxan-hydrochloric acid and dioxan-nitric acid media on a …
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