remOvAL RADioACTIviTY FrOM zIrCon SAnD

  • EP0582598A1 - Removal of radioactivity from zircon ...

    EP0582598A1 - Removal of radioactivity from zircon. - Google Patents Removal of radioactivity from zircon. Info Publication number EP0582598A1 ... Recovery of scandium, yttrium and lanthanides from zircon sand JP2633000B2 (en) * 1989-01-28: 1997-07-23: 動力炉・核燃料開発

  • Pure zircon process for removing radionuclides from

    2013-7-18 · However, some zircon sands contain radioactivity levels well above this limit. A new process (the pure zircon process) is described for the removal of radioactivity from zircon. Tests to identify the best flux addition, calcination temperature and time, and leaching conditions indicated that by grinding a zircon sample containing 1059 ppm U ...

  • Removal of Radioactivity from zircon - Patent CN-1049065

    CN-1049065-C chemical patent summary.

  • WO1992018985A1 - Removal of radioactivity from zircon ...

    The specification discloses a process for removing radionuclides from zircon. The process involves thermally decomposing the zircon in the presence of suitable additives, extracting the radionuclides chemically and recovering zirconia and silica. Suitable additives include fluxes, silica and any oxide capable of forming a silicate with silica when heated.

  • Pure zircon process for removing radionuclides from

    A new process (the pure zircon process) is described for the removal of radioactivity from zircon. Tests to identify the best flux addition, calcination temperature and time, and leaching ...

  • Occupational exposure to natural radioactivity in a zircon ...

    This sand contains varying concentrations of natural radionuclides: mostly U-238 but also Th-232 and U-235, together with their daughters, and therefore may need to be regulated by Directive 96/29/EURATOM. This paper describes the method used to perform the radiological study on a zircon sand milling plant and presents the results obtained.

  • Occupational exposure to natural radioactivity in a zircon ...

    2008-10-1 · 2.2.. ExperimentalThe plant obtains its raw materials from Australia and South Africa. These zircon sands have a particle size of 100–200. μm diameter.. They are ground to a small particle size of ≤50 μm (zircon flour) by the dry milling process, and to an even finer ground product (micronized zircon) by the wet milling process (≤5 μm).). Zircon sands and end

  • Radioactivity of Heavy Mineral Sands as an Indicator of ...

    indicator of coastal sand transport processes. Journal of Coastal Research, 7(1), 189-201. Fort Lauderdale (Florida), ISSN 0749-0208. Heavy mineral-rich beach sands, concentrated by wave and wind action, have been found to contain significant gamma radioactivity, due primarily to trace amounts of uranium and thor-ium found in monazite and zircon.

  • Radioactivity in monazite, zircon, and "radioactive black ...

    Briefly discusses and tabulates observed values of radioactivity in monazite, in several different types of zircon grains, and in dark-colored or black metamict grains not previously recorded from the black sand concentrates of the Nile delta at Rosetta.

  • Naturally-occurring radioactive materials and the ...

    2016-11-1 · radioactivity content of manufactured zirconia depends on the activity of the source zircon and the production process used. Thermal zirconia contains higher levels of radionuclides than the parent zircon, whereas chemically-produced zirconia may contain very low levels of

  • Removal of Radioactivity from zircon - Patent CN-1049065

    CN-1049065-C chemical patent summary.

  • Occupational exposure to natural radioactivity in a zircon ...

    This sand contains varying concentrations of natural radionuclides: mostly U-238 but also Th-232 and U-235, together with their daughters, and therefore may need to be regulated by Directive 96/29/EURATOM. This paper describes the method used to perform the radiological study on a zircon sand milling plant and presents the results obtained.

  • Radiation protection aspects of the use of zircon sand ...

    Zircon sand contains high concentrations of natural radionuclides and is a typical example of an enhanced source. Using various techniques the characteristics of the original material were analysed and environmental radioactivity was measured in

  • Occupational exposure to natural radioactivity in a zircon ...

    2008-10-1 · 2.2.. ExperimentalThe plant obtains its raw materials from Australia and South Africa. These zircon sands have a particle size of 100–200. μm diameter.. They are ground to a small particle size of ≤50 μm (zircon flour) by the dry milling process, and to an even finer ground product (micronized zircon) by the wet milling process (≤5 μm).). Zircon sands and end

  • Towards cleaner production – Using flotation to recover ...

    2017-2-1 · In line with the principles of cleaner production, the removal of monazite via reverse flotation was investigated with a view to reducing the radioactivity of a heavy mineral sands waste stream. Another benefit was to create a potential REE by-product from the Namakwa Sands operation in South Africa.

  • Naturally-occurring radioactive materials and the ...

    2016-11-1 · radioactivity content of manufactured zirconia depends on the activity of the source zircon and the production process used. Thermal zirconia contains higher levels of radionuclides than the parent zircon, whereas chemically-produced zirconia may contain very low levels of

  • A Practical Approach to Replacing Zircon

    2015-8-4 · A Practical Approach to Replacing Zircon Tom Branscomb, Buntrock Industries Abstract The replacement of zircon flour and sand is discussed in practical terms. Results of trials using Cerabeads 60 as alternate sand are given. Replacement of zircon flour is discussed. Casfill 85 is demonstrated to have promise for zircon flour replacement.

  • MINERAL SANDS - Earth Sci

    2017-6-26 · Uses of Mineral Sands Products Radioactivity Australia is a major producer of mineral sands containing titanium minerals and zircon. A valuable by-product of this is monazite containing thorium, which is radioactive. Monazite is

  • Gaining from loss: Detrital zircon source-normalized α ...

    Selective removal of more labile (i.e., metamict) zircon grains, correlating with active time in the sedimentary system, leads to a decrease of source-normalized α-dose values . A value close to 1 is characteristic of first-cycle material and reduced transportation of grains, with values progressively decreasing in tandem with progressive ...

  • Radioactivity in monazite, zircon, and "radioactive black ...

    Briefly discusses and tabulates observed values of radioactivity in monazite, in several different types of zircon grains, and in dark-colored or black metamict grains not previously recorded from the black sand concentrates of the Nile delta at Rosetta.

  • Occupational exposure to natural radioactivity in a zircon ...

    According to its composition, zircon minerals are in the form of zirconium silicate (ZrSiO 4 ), or zircon sand. For zircon crystals, various impurities can be related, as some radionuclides from ...

  • Assessment of the radiological impacts of a Zircon sand ...

    The paper presents th e results of a study on radiological impacts resulting from a zircon. sand processing plant located in the North-Eastern part of Italy. Activity concentrations of ...

  • Recovery and processing of zircon from Murray Basin ...

    However, some zircon sands contain radioactivity levels well above this limit. A new process (the pure zircon process) is described for the removal of radioactivity from zircon. Tests to identify ...

  • Radiation exposure in the transport of heavy mineral

    2017-4-26 · The subject of the study was the mineral sands industry in Australia. Heavy minerals (zircon, rutile, ilmenite, leucoxene, and monazite) are mined and processed in all States of Australia (except Tasmania). The transport of minerals is a significant component of the mining and production. 1. Mineral sands mining and processing

  • Towards cleaner production – Using flotation to recover ...

    2017-2-1 · In line with the principles of cleaner production, the removal of monazite via reverse flotation was investigated with a view to reducing the radioactivity of a heavy mineral sands waste stream. Another benefit was to create a potential REE by-product from the Namakwa Sands operation in South Africa.

  • A Novel Process for Production of High Purity Zirconium ...

    High purity zirconium oxy chloride synthesis method has been developed from zircon sand of Chatrapur beach placer deposit of IREL Odisha. Chemical method of purification is found to be suitable means of producing high purity zirconium oxy chloride with very low radioactivity. Complexing agent such as pentetic acid or diethylene triamine penta acetic acid is found to be

  • A Practical Approach to Replacing Zircon

    2015-8-4 · A Practical Approach to Replacing Zircon Tom Branscomb, Buntrock Industries Abstract The replacement of zircon flour and sand is discussed in practical terms. Results of trials using Cerabeads 60 as alternate sand are given. Replacement of zircon flour is discussed. Casfill 85 is demonstrated to have promise for zircon flour replacement.

  • Selective Removal of Phosphorus from Seawater Using ...

    2020-4-2 · prepared from zircon sand by simple mechanochemical treatment [7]. This adsorbent can be provided inexpensively and be used to remove phosphorus in high salt water, such as seawater. However, the details of phosphorus removal behavior in seawater have not been clarified. In this study, the adsorbent with high selective phosphorus

  • Safety data sheet for Zircon Sand - LKAB Minerals

    2019-4-15 · Zircon Sand This generic SDS is provided by LKAB Minerals to give information to assist with material handling of the products listed which are not classified as hazardous under the GHS and / or the CLP regulations. 1.1 Product identifier Product name: Zircon Sand REACH registration number: Exempt CAS number: 14940-68-2