Rare earths and thorium occur in the minerals monazite, brockite, and bastnaesite. Thorium content of 35 samples ranged from 0.01 to 1.2 percent, and the total rare-earth content of 21 samples from 0.23 to 9.8 percent. Indicated reserves were calculated to a depth of one-third the exposed length of the vein. Inferred reserves lie in a block ...
Sphene is an abundant accessory mineral in some abnormally radioactive plutonic rocks in west-central Alaska. Seven samples of sphene from four different areas in west-central Alaska contained from 20350 to 39180 parts per million total rare earths and 390 to 2000 ppm thorium. The lanthanide content in six of the seven sphenes is chiefly the light rare earths and is similar to that of crustal ...
for the deternation of rare earths in thorium are in the 50-100 ppm range. Since it is essential that the cited rare earths, especially gadolinium, not be present in thorium in amounts greater than 0.1 ppm, prior concentration of the rare earths from the thorium is necessary to obtain the desired sensitivity.
Jun 05, 2019 Rare earths are made up of the 15 Lanthanide Components in the routine table and 2 outliers Scandium and Yttrium. As with numerous mineral deposits, there are also other less desirable minerals collocated in these veins of unusual earth minerals. These include uranium and
Dec 01, 2017 In order to study the aqueous stability of rare earth and thorium elements and the reaction mechanism of hydrochloric acid leaching of roasted bastnaesite, E h pH diagrams for La, Nd, Ce, Th(Cl)(F)H 2 O systems at 20 C were depicted using HSC Chemistry 6.0 software. E h pH diagrams of La, Ce, Nd and ThClH 2 O systems show that trivalent rare earth would ...
Uranium, Thorium, Rare Earths and Other Metals in Cretaceous Age Basement Rocks A Source for New Uranium District in Tertiary Age Sediments of the McCarthy Basin (A New Middle Cretaceous Age Impact Crater?), and an Associated New Metallogenic Locale Adjacent to the Death Valley, Eastern Seward Peninsula, Alaska
Oct 06, 2021 The site is rich in monazitean ore containing rare earth minerals including thorium, lanthanum and cerium. However, the project has been blocked
0.062 percent thorium, 1.51 percent combined rare-earth oxides including yttrium oxide and 24.8 percent iron. Scatter diagrams of sample data show a direct correlation between equivalent uranium, uranium, thorium, and combined rare earth oxides. Both cerium- and yttrium-group earths are abundant in the rare-earth minerals.
Rare Earths and Thorium are linked at the mineralogical level. James Kennedy provides consulting services to the financial, mining and nuclear energy industry on strategic issues related to Rare Earths, Thorium and the U.S. regulatory environment.
Recently, the recovery of rare earths from a variety of resources has gained much interest. Radioactive elements of uranium and thorium are usually associated with rare earth deposits. The separation of uranium and thorium from rare earths is often a big concern in rare earth industry in order to reasonably manage the radioactive nuclides.
As a typical radioactive element associated in rare earth ore, thorium makes it difficult to the treatment and disposal of rare earth slag. So in order to achieve the reduction and harmlessness of rare earth waste, we need to seek a processing method to enrich,
Oct 06, 2021 The site is rich in monazite -- an ore containing rare earth minerals including thorium, lanthanum and cerium. China has a stranglehold on global supply of rare earths ...
DESCRIPTIVE MODEL OF THORIUM-RARE-EARTH VEINS DESCRIPTION . Various thorium and rare-earth minerals in a quartz-potassium feldspar-iron-oxide gangue in veins 1 to... TYPICAL DEPOSITS . Last Chance vein, Lemhi Pass district, Montana ( Staatz, 1979 ) Little Johnnie vein, Powderhorn... RELATIVE ...
Mar 15, 2011 The mining of the rare earths and the processing of the various elements produces large amounts of thorium as a byproduct. This material is radioactive and dangerous to human health.
Jun 05, 2019 These include uranium and thorium, which are radioactive. When making use of a deposit of rare earth minerals, the processing of the minerals leaves behind mining tailings of radioactive thorium and uranium.
Thorium bearing rare earth element phosphate ores (Th-REE-Ps), principally monazite, were the primary commercial source of rare earths until the mid-1960s. From 1965 to 1984, these Th-REE-P materials supplied nearly half of the worlds rare earths requirements, and nearly 100% of
When a mixture of rare earths, thorium, and uranium at pH 1.0 in sulfate medium is passed through a column (1.5 x 12 cm) of Dowex A-1(H/sup /), rare earths pass through. Then thorium is eluted with 6N hydrochloric acid and subsequently the uranium with 2N nitric acid.
THORIUM AND RARE-EARTH DEPOSITS IN THE UNITED STATES 519 Thorium is purchased in the mineral monazite, which is sold for arid graded on its combined rare-earth and thorium content. ORE DEPOSITS Monazite is the principal ore mineral of both thorium and the rare earths. In this country, thorite is an important potential ore mineral
The coefficients for extraction of rare earths from thorium- and uranium-barren monazite liquors with primary amines (0.2 M) were less than 1but high enough to allow 98% extraction in three to four ideal extraction stages. At high rare earth loadings the phosphate content of the extract was-5-
The oxide and hydroxide mixture of thorium, cerium, and rare earths is first oxidized at above 100 deg C so as to convert the cerium to tetravalent ceric oxide. This oxide is treated with hydrochloric or nitric acid to pH 2 or 3 to dissolve the rare earths and to precipitate insoluble thorium and
Total rare-earth oxide content of 31 samples from 21 veins in the area ranges from 0.073 to 2.24 percent. Rare earths and thorium commonly occur together in the same minerals, though in different proportions. The three most common of these minerals are thorite, monazite, and brockite. Some thorium is contained in goethite.
The rocks sampled also contain thorium and rare-earth elements associated with allanite and common accessory minerals. The major zone of mineralization examined appears to be related to prominent phonolite dikes that occur along its margin in monzonitic country rock. Metasomatic introduction of uranium, thorium, and rare earths related to dike ...
contain less uranium and thorium then uranium mines, but will require special handling of the mine waste. Future development of these commodities will be challenging and more research is required to fully understand the REE potential in New Mexico. Introduction Overview Before 2010 most Americans never heard of rare earth elements
STL previously had the rights to the thorium at Steenkampskraal. The acquisition of Rareco gives STL access to one of the worlds highest-grade rare earth and thorium deposits with an average grade of 14.4% rare earths and 2.14% thorium. Trevor Blench, chairman of STL, said the mine is expected to begin production in about 30 months.
Mar 15, 2012 Another potential sponsor was U.S. Rep. John Shimkus, R-Collinsville, who is interested in rare earths and thorium as a GOP leader in the House Energy and Commerce Committee. But a spokesman told ...
Production of Rare Ear ths from Thorium Containing Minerals This safety report is a compilation of detailed information on the processes and materials involved in the production of rare earths from thorium containing minerals and on the radio-logical considerations that need to be taken into
Chin. Rare Earth 31 (2), 6569 (in Chinese). Crouse, D.J., Brown, K.B., 1959. Recovery of thorium, uranium and rare earths from thorium is locked in solid precipitates or solid residues while rare monazite liquors by the amine extraction (AMEX) process. Report of Oak Ridge earths stay in
A process for producing at least one rare earth chloride from an ore containing the at least one rare earth comprises contacting the ore containing the at least one rare earth with reactants comprising a carbonaceous reducing agent, chlorine, and a boron-containing Lewis acid in a chlorination reactor to produce a gaseous product and a non-volatile chloride mixture comprising the at least one ...
Feb 22, 2012 The recovery of rare earths, niobium, and thorium from Bayan Obos tailings has been investigated because the Bayan Obo ore is rich in rare earths and rich in niobium and thorium, but it is mined mainly as an iron ore and will be used up soon. By carbochlorination between 823 K (550 C) and 873 K (600 C) for 2 hours, 76 to 93 pct of rare earths were recovered from the tailings, which were ...
Separation of U and Th from Rare Earths by Solvent Extraction Di(1-Methyl-Heptyl) Methyl Phosphonate (DMHMP) is recently used in industry to separate thorium from other rare earth elements. Thorium is extracted from others in a HCl-NH3 media Amine products are also used to separate uranium and thorium from other rare earth elements.
result the Light Rare Earths, Thorium, and Uranium have now mostly passed through these clays, but the higher atomic numbered Rare Earths, the heavier ones, have been slower to follow, so we have now deposits trending sharply towards the Heavy Rare Earths in concentrations of 50-500 ppm in
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