Material Processing

Quarry Plant Solutions /Stone Crusher Plants
AS a leading global manufacturer of Stone Crusher equipment, we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete stone crushing plant. We also supply individual crushers and mills as well as spare parts of them.

Phosphate rock radionuclides

  • Management of Phosphate Tailings - WISE Uranium

    Potential impurities associated with the phosphogypsum are related to fluorides, radionuclides, and trace metals such as arsenic, cadmium, copper, lead, nickel, zinc and mercury. These compounds are naturally occurring in the phosphate rock and are concentrated in the phosphogypsum by-product during the phosphoric acid production process.

  • Distribution of natural radionuclides in the production

    Phosphoric acid is the starting material for triple superphosphate (TSP), single superphosphate (SSP), monoammonium phosphate (MAP) and diammonium phosphate (DAP). The phosphate rock used as raw material presents in its composition radionuclides of the U

  • TENORM: Fertilizer and Fertilizer Production Wastes

    Apr 07, 2021· Phosphate rock (phosphorite) mining is the fifth largest mining industry in the United States in terms of quantity of material mined. In 2019 the total production of phosphate rock in the U.S. was estimated at 23 million metric tons (MT). Most phosphate production leads to

  • (PDF) Natural radioactivity in phosphate rock

    SSP, TSP and NPK, which are obtained by mixing phosphoric acid with different amounts of phosphate rock and NH3, presented higher concentrations of radionuclides, up to 871 Bq .

  • Occupational Exposures and Distribution of Natural

    phosphate rock that have passed the separator (optimum grain size for reaction). The obtained results show the elevated concentrations of the radionuclides belonging to the U-series in the treated mineral (1.6-1.8 kBq/kg), and reflect the existence in the

  • International Journal of Engineering Research and General

    For example, in East Africa, Minjingu phosphate rock is commonly applied directly to cropsduring farming [11], [12], [13]. radionuclides in the production and use of phosphate fertilizers in agriculture. One of the main components of the study was to predict

  • The natural radioactivity of the rock phosphates

    May 28, 1993· A model for pathways of the natural radionuclides from the ground rock phosphate, phosphate fertilizers and by-products is proposed in order to assess their long-term impacts on the secondary environment. Key words: radioactivity; ground rock phosphates; fertilizers INTRODUCTION Rock phosphate, phosphate fertilizers and phosphogypsum are

  • RELEASE OF RADIUM AND OTHER DECAY-SERIES ISOTOPES

    Dec 05, 2014· radionuclides released from the uranium-enriched phosphatic strata. Radiochemical and geochemical studies of a series of phosphate rock samples representing various degrees of chemical weathering are the

  • Natural radioactivity in phosphate fertilizers SpringerLink

    Radioactive materials, like uranium and radium, are normal constituents of the earth's crust. The radioactivity of phosphate rock is enhanced by geological processes. Exposure of workers and the public to radiation from phosphate rock and fertilizer is therefore not unlikely. The European Commission has issued a draft proposal for revision of the Basic Safety Standards for the

  • Distribution of natural radionuclides in the production

    Radionuclides concentrations of (238U, 226Ra, 232Th and 40K) maintained in El-Sebeaya low grade phosphate rock and the leaching residue samples were measured using Gamma-ray spectrometer.

  • (PDF) Natural radioactivity in phosphate rock

    SSP, TSP and NPK, which are obtained by mixing phosphoric acid with different amounts of phosphate rock and NH3, presented higher concentrations of radionuclides, up to 871 Bq . kg-1 for 226Ra

  • Environmental impact of phosphate mining and beneficiation

    Of all the radionuclides in phosphate rock, 226 Ra is of particular interest because of its long half-life, radiotoxicity and its relative physical and biological mobility. The nuclide is of further importance as the parent nuclide of the gaseous 222 Rn which, along with its solid decay products, constitutes a significant source of radiation

  • Radionuclides and Preliminary Radiological Assessment in

    Radionuclides and Preliminary Radiological Assessment in the Phosphate Industry of Senegal Ababacar S. Ndao1, Fernando P. Carvalho2, L.Silva 2, J. M. Oliveira2, M. Malta2, and Ndeye A. Boye Faye2 1 Laboratoire Atome Lasers, Département de Physique, Faculté des Sciences et

  • (PDF) SYNTHESIS OF DICALCIUM PHOSPHATE USED AS FEED

    Wet acid digestion of the phosphate rock with sulphuric acid and hydrochloric acid is commonly used for dicalcium phosphate production both acids used also lead to the enhancement of several radionuclides within the final product7,8. When phosphate rock is treated with hydrochloric acid even lower values of magnesium, iron and aluminium are

  • Natural radioactivity and dose assessment for phosphate

    The environmental pathways of natural radionuclides from phosphate rocks are given in Fig. 2 (Khater et al., 2001). The untreated ground rock phosphate has been used in many parts of the world as plant fertilizer at a rate ranging from 300 to 600 kg/ha (104 m2) (Makweba and Holm, 1993). This is not the case in Egypt.

  • 11.21 Phosphate Rock Processing

    PM and SO2 and depend on fuel type (coal or oil), air flow rates, product moisture, and grade of rock. Phosphate rock contains radionuclides in concentrations that are 10 to 100 times the radionuclide concentration found in most natural material. Most of the radionuclides consist of

  • Assessment of the natural radioactivity and its

    Radioactivity of terrestrial radionuclides 226Ra, 232Th and 40K in phosphate rock samples has been measured using gamma ray spectrometry system with an HPGe detector. The samples showed fairly high mean concentrations, 410±39 Bq.kg-1 of 226Ra,

  • Distribution of natural radionuclides in the production

    Radionuclides concentrations of (238U, 226Ra, 232Th and 40K) maintained in El-Sebeaya low grade phosphate rock and the leaching residue samples were

  • (PDF) Natural Radioactivity Assessment of a Phosphate

    Jan 02, 2014· Rock phosphate ore processing and disposal of phosphogypsum contribute to enhanced levels of natural radionuclides in the environment. The concentration of naturally occurring radionuclides in

  • Natural radioactivity assessment of a phosphate fertilizer

    Jan 01, 2014· Rock phosphate ore processing and disposal of phosphogypsum contribute to enhanced levels of natural radionuclides in the environment. The concentration of naturally occurring radionuclides in soil, rock phosphate and phosphogypsum samples collected around a phosphate fertilizer plant were determined.

  • RADIOLOGICAL IMPLICATIONS OF USING PHOSPHOGYPSUM

    In the phosphate rock, the radionuclides of the U and Th series are in equilibrium. During the chemical process, this equilibrium is disrupted, and the radionuclides migrate in the products, by-products and residue according to their chemical properties and solubility.

  • EMISSION FACTOR DOCUMENTATION FOR AP-42 SECTION

    type (coal or oil), air flow rates, product moisture, and grade of rock. Phosphate rock contains radionuclides in concentrations that are 10 to 100 times the radionuclide concentration found in most natural material. Most of the radionuclides consist of uranium and its decay products. Some phosphate rock also contains elevated levels of thorium

  • Uranium, radium, and thorium content in phosphate rocks

    May 01, 2002· Distribution of natural radionuclides during the processing of phosphate rock from Itataia-Brazil for production of phosphoric acid and uranium concentrate. Radiochimica Acta 2000, 88 Population dose from natural radionuclides in phosphate fertilizers. Radiation and Environmental Biophysics 1976, 13 (3) , 247-261.

  • Radioactive Material From Fertilizer Production RadTown

    Dec 02, 2020· Phosphate rock contains small amounts of naturally-occurring radionuclides, mostly uranium and radium. When processing phosphate rock to make fertilizer, the phosphorous

  • (PDF) Assessment of the natural radioactivity and its

    Radioactivity of terrestrial radionuclides 226 Ra, 232 Th and 40 K in phosphate rock samples has been measured using gamma ray spectrometry system with an HPGe detector.

  • A Study on the Radioactivity Level in Raw Materials, Final

    A study on the detection of probable radionuclides and their activity concentrations in the raw material (phosphate rock), final product (fertilizer) and waste samples collected from all the phosphate fertilizer factories (total two factoriesA Diammonium Phosphate, DAP and a Triple Super Phosphate, TSP factory) in Bangladesh were carried out.

  • Radionuclides: Regulatory Impact Analysis of Emissions

    Radionuclides of the uranium series, including polonium 210 (Po-210), lead 210 (Pb-210), and uranium 238 (U-238), occur naturally in phosphate rock. The exhaust gases from phosphate rock nodulizing calciners at elemental phosphorus plants are considerably enriched with radionuclides because the Po-210 and Pb-210 volatilize at the elevated

  • Naturally Occurring Radioactive Materials NORM - World

    Phosphate rock used for fertiliser is a major NORM due to both uranium and thorium. Phosphate is a common chemical constituent of fertilizer. It is principally mined from apatite and phosphate rocks (phosphorite) in which the concentration of phosphate has been enhanced by sedimentary, igneous, weathering and biological processes.

  • Radioactivity Distribution in Phosphate Products, By

    These findings both confirm previous examinations of phosphate rock and shows that the primarily physical separations of beneficiation do not V significantly alter the states of equilibrium, although beneficiation does produce a redistribution of the concentrations of the radionuclides from the mine rock to the marketable rock, slimes, and sand

  • Lung-clearance classification of radionuclides in calcined

    OSTI.GOV Technical Report: Lung-clearance classification of radionuclides in calcined phosphate rock dust Title: Lung-clearance classification of radionuclides in calcined phosphate rock

  • Natural radioactivity assessment of El-Sebeaya low grade

    The leaching of the phosphate rock using hydrochloric acid redistribute the radionuclides concentrations of 238 U, 226 Ra, 232 Th, and 40 K unsymmetrically between the various products; the leach liquor (liquid phase) and phosphate leaching residue (solid phase) which leads to the

  • Natural radioactivity in phosphate rock, phosphogypsum and

    Phosphate rock is used worldwide for manufacturing phosphoric acid and various brands of chemical fertilizers. It is known that the phosphate rock contains radionuclides of the U and Th natural decay series. The mining and processing of this phosphate rock redistributes radionuclides throughout the environment

  • Natural radioactivity in phosphates, phosphogypsum and

    The contents of natural radionuclides (uranium, actinium and thorium series) were measured in sedimentary phosphate rock samples using high-resolution gamma spectrometry.

  • Radiological impacts of natural radioactivity in phosphate

    Using gamma spectrometry, the activity concentrations of natural radionuclides (Ra-226, Th-232 and K-40) were measured in phosphate rock samples collected from phosphate mines located in

  • Natural radioactivity assessment of El-Sebeaya low grade

    The leaching of the phosphate rock using hydrochloric acid redistribute the radionuclides concentrations of 238 U, 226 Ra, 232 Th, and 40 K unsymmetrically between the various products; the leach liquor (liquid phase) and phosphate leaching

  • Natural radioactivity in phosphate rock, phosphogypsum and

    May 01, 2005· Contents of natural radionuclides from thorium and uranium series, 226 Ra, 210 Pb and 228 Ra, were measured in Brazilian igneous phosphate rock, phosphoric acid, phosphogypsum and phosphate fertilizer samples, using high-resolution gamma-spectrometry. Neutron activation analysis was used for the determination of U and Th in the same samples.

  • Assessment of natural radioactivity in phosphate ore

    The radionuclides present in phosphate ore, phosphogypsum and soil samples in the vicinity of a phosphate fertilizer plants in Nigeria were identified and their activity concentration determined to assess the potential radiation impact on the environment due to fertilizer production. The mean activity concentration of (238)U, (232)Th, and (40)K

  • Phosphate Rock - an overview ScienceDirect Topics

    Phosphate rock used for fertilizer is a major NORM due to both uranium and thorium. Phosphate is a common chemical constituent of fertilizer. It is principally mined from apatite and phosphate rocks (phosphorite) in which the concentration of phosphate has been enhanced by sedimentary, igneous, weathering, and biological processes.

  • ASSESSMENT OF THE HEAVY METALS AND NATURAL

    The phosphate rock extractions are man-made sources of air- and water borne radionuclide releases to the environment. Phosphate rocks contain relatively high concentrations of naturally occurring radioactive materials from uranium series and thorium series (238U and 232Th).Mining,


Copyright © 2021 Meilan International Jaw crusher / Cone crusher / Contact Us