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scandium (Sc), chemical element, a rare-earth metal of Group 3 of the periodic table. Scandium is a silvery white, moderately soft metal. It is fairly stable in air but will slowly change its colour from silvery white to a yellowish appearance because of formation of Sc2O3 oxide on the surface. The
Scandium can be recovered from thortveitite or extracted as a by-product from uranium mill tailings (sandy waste material). Metallic scandium can be prepared by reducing the fluoride with calcium metal. It can also be prepared by electrolysing molten potassium, lithium and scandium chlorides, using electrodes of tungsten wire and molten zinc.
Comparing the scandium leaching efficiency using 0.5 M sulphuric acid at 23°C with that using 1.0 M sulphuric acid at 50 °C, the scandium leach efficiency was increased from 32.0% to 47.6% even with higher S/L ratio, indicating that the acidity of the leach solution and temperature played important roles in red mud leaching.
The principal economic sources of rare earths are the minerals bastnasite, monazite, and loparite and the lateritic ion-adsorption clays. The rare earths are a relatively abundant group of 17 elements composed of scandium, yttrium, and the lanthanides. The elements range in crustal abundance from cerium, the 25th most abundant element of the 78 common elements in the Earth's
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Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.
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Only about 3% of plants that were analysed for scandium shows its presence, and even those amounts were tiny, with vegetable having only 5 ppb although grass has 70 ppb. Health effects of scandium. Scandium has no biological role. Only trace amounts reach the food chain, so the average person's daily intake is less than 0.1 microgram.
On July 7, Energy Fuels Inc. made its first regular shipment of a rare earth carbonate called monazite from the United States to Europe. The metal started in …
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In this study, Central Appalachian coal-derived fly ashes from two power plants were beneficiated in a pilot-scale facility in order to produce a product with a relatively consistent concentration of rare earth elements (REE). The <200-mesh final fly ash product was produced by removing the carbon- and Fe-rich particles prior to screening at 200 mesh (75 µm).
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Rare earth elements (REEs) are a group of 15 chemical elements in the periodic table, specifically the lanthanides. Two other elements, scandium and yttrium, have a similar physiochemistry to the lanthanides, are commonly found in the same mineral assemblages, and are often referred to as REEs.
Scandium. Scandium is a soft, silvery metallic element. Its atomic number is 21, making it the lightest of the transition metals. Scandium is not particularly rare - its occurrence in crustal rocks is 22 around ppm. This makes scandium generally more abundant than lead, mercury, and precious metals. Despite this fairly common occurrence ...
(P,N) reactions in deuterium, scandium and vanadium: 1.1MB: Local PDF: LAMS-1876: On the emission probabilities of fission neutrons: 1.6MB: Local PDF: LAMS-188 [Memorandum from R. E. Peierls on detonation rate for plane and expanding waves, dated January 5, 1945] 291KB: Local PDF: LAMS-189
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A method for isolating scandium values is provided. The method includes extracting scandium values from a leachate with an organic solvent, thereby obtaining a scandium-loaded organic solvent, wherein the leachate contains iron and scandium ions, and wherein the organic solvent contains a primary amine. The scandium values are then stripped from the scandium-loaded solvent with a stripping ...
Scandium is a chemical element that has the symbol Sc and the atomic number 21. It is a soft silvery metal that has three times the density of water and can be found in the form of solid at room temperature. Scandium burns easily and reacts with water. Scandium is categorized as the d-block element (also called transition metal) in the periodic ...
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