• The magnetic properties of siderite concretions and

    MAGNETIC PROPERTIES OF SIDERITE CONCRETIONS 53 ARM were accompanied by large directional changes From the K measurements it is clear that a strong magnetic phase was formed, which started to convert into hematite above 450 in series A, but above 550 in series B Complete inversion to hematite seems not to be obtained after heating at 675, at least in the fresh siderites

  • Cited by: 14
  • Modification of magnetic properties of siderite ore by

    The influence of microwave radiation on the magnetic properties of siderite ore was confirmed by the change of magnetic susceptibility that occurred after 10 min of microwave heating After 30 min of irradiation, Fe total of specimen reached 456% and its magnetic susceptibility was on the level of

  • Cited by: 31
  • Synthesis and Magnetic Characterization of Siderite

    SEM confirms radial growth texture consistent with naturally occurring siderite

  • Rock magnetic properties related to thermal treatment of

    magnetic properties associated with the thermal treatment of siderite in air is lacking at present In this study, we use natural crystalline, highpurity siderite specimens to investigate magnetic properties and mineral phase variations associated with its oxidation in thermal treatments in air

  • Cited by: 121
  • Modification of magnetic properties of siderite ore by

    After 10 min of heating an essential change in the magnetic properties of the ore samples occurred, and after 15 min, a rapid increase of magnetic susceptibility value was observed, showing the intensive decomposition of siderite

  • Cited by: 31
  • Mineral Magnetic Properties of Partially Oxidized

    Conform literature data siderite was found to have a magnetic ordering temperature of 38 K Oxidation appears to smear out the remanence warming curves while also shifting the ordering temperature upward Specific magnetic moments were found to vary distinctly, being both lower and higher than reference values

  • Author: M J Dekkers, W J F Hanckmann, S Spassov, T Behrends
  • Low‐temperature magnetic properties of siderite and

    Low temperature magnetic techniques provide useful tools to detect the presence of magnetite and pyrrhotite in sediments through identification of their low temperature transitions, to determine the amount of ultrafine‐grained (superparamagnetic) material in sediments, and can potentially detect the presence of certain types of magnetotactic bacteria

  • Cited by: 78
  • Rock magnetic properties related to thermal

    It has been revealed in detail that the original inverse magnetic susceptibility fabric contributed by the crystalline anisotropy of siderite in siderite‐bearing specimens is changed to a normal magnetic fabric during incremental heating over 410°–490°C

  • Cited by: 121
  • Low‐temperature magnetic behavior related to

    Meanwhile, residual siderite still plays an important role in the magnetic properties, seen in (1) distinct jumps/drops at 40 K on the cooling/warming curves; (2) the consistent shape of the AC susceptibility curves and; (3) SIRM 300K intensities that are still much lower than the values attained after heating to higher temperatures

  • Cited by: 17
  • Synthesis and Magnetic Characterization of Siderite

    Synthesis and Magnetic Characterization of Siderite Particles with Varying Morphologies: Implication for Rock Magnetic Properties Lindsay A Hegner1, Jennifer H Strehlau1, Becky E Strauss2, Joshua M Feinberg2, and R Lee Penn1 1Department of Chemistry, University of Minnesota, Minneapolis, MN 2Institute for Rock Magnetism, Department of Earth Sciences, University of

  • Electromagnetic Separation Siderite & Blende

    Table of ContentsCalcining Siderite to the Magnetic Oxide Separation of Raw Siderite Separation of Calcined Siderite from Blende The specific gravities of blende (39 to 42) and siderite (37 to 39) are almost identical, and they may not be separated by any method based on this property The most important application of magnetic separation in Europe has been the separation of siderite, or

  • Modification of magnetic properties of siderite ore by

    A study conducted on siderite ore for improvement of process conditions, namely the process duration, has resulted that the modification of the magnetic properties of mineral components in

  • Pressure induced magnetic transition in siderite FeCO3

    We have investigated the magnetic state of iron in siderite FeCO 3 under high pressure using Kβ xray emission spectroscopy Pressure induced changes in the shape of the iron Kβ emission lines indicate that the iron ground state changes from a low pressure magnetic state to a high pressure nonmagnetic state This transition takes place

  • EXPERIMENTAL SHOCK DECOMPOSITION OF SIDERITE

    patterns (Figure 1), in experimentally shocked siderite at 49 GPa The magnetic components of this mix have now been concentrated by isolating magnetic grains from the bulk shocked material for chemical and other analyses of the shock products Using a hand magnet drawn beneath weighing paper upon which the sample powder had been

  • Separation of Phosphorus and Magnetic Mineral Fines

    The characteristics of siderite reductive ore and the ultrafine grindingmagnetic flocculation separation (MFS) of this ore were investigated in the present work The results indicated that the iron phase in the raw ore was predominantly metallic iron with an iron particle size below 30 μm, and the phosphorus compound was apatite

  • Selenite Reduction by Mackinawite, Magnetite and

    Suboxic soils and sediments often contain the Fe(II)bearing minerals mackinawite (FeS), siderite (FeCO3) or magnetite (Fe3O4), which should be able to reduce aqueous selenite, thereby forming solids of low solubility While the reduction of selenate or selenite to Se(0) by green rust, pyrite and by Fe2+ sorbed to montmorillonite is a slow (weeks), kinetically limited redox reaction as

  • Siderite Mineral Properties, Photos and Occurence

    Siderite is a member of calcite group minerals, which have a similar structure and form several solidsolution series The miscibility of the calcite group members is limited though Of the several possible members of the solidsolution series associated with siderite (FeCO 3), only the smithsonite (ZnCO 3), magnesite (MgCO 3) and rhodochrosite (MnCO 3) varieties are common

  • Mechanical properties of siderite and hematite from

    In this paper, mineralogy of a siderite lump was studied, a process of coalbased direct reductionmagnetic separation of the siderite lump sample was proposed and process parameters have been

  • Formation of diagenetic siderite in modern

    Siderite crystals were retrieved via density separation and sorted by placing a neodymium magnet under the beaker and rinsing out the nonmagnetic fraction with deionized water Siderite imaging and elemental analysis were performed on a Zeiss Ultra 55 Plus field emission scanning electron microscope (SEM) equipped with an energydispersive X

  • Lowtemperature magnetic properties of siderite and

    Low temperature magnetic techniques provide useful tools to detect the presence of magnetite and pyrrhotite in sediments through identification of their low temperature transitions, to determine the amount of ultrafinegrained (superparamagnetic) material in sediments, and can potentially detect the presence of certain types of magnetotactic bacteria

  • Siderite Beneficiation with Magnetic Separation

    Exploratory experiments were conducted according to the property of a siderite mineral composition and structure has the advantages of simple structure, low grade theory The siderite Contain Fe 2746%, Pb 097% First magnetic Fe separation, because of the lower grade ore, for the two stages selection, In 90% of the fineness, good beneficiation indexes, Fe concentrate grade reaches 4549%

  • Pressure induced magnetic transition in siderite FeCO3

    We have investigated the magnetic state of iron in siderite FeCO 3 under high pressure using Kβ xray emission spectroscopy Pressure induced changes in the shape of the iron Kβ emission lines indicate that the iron ground state changes from a low pressure magnetic state to a high pressure nonmagnetic state This transition takes place

  • Low Temperature Magnetic Properties of Siderite and

    Low Temperature Magnetic Properties of Siderite and Magnetite in Marine Sediments By Bernard A Housen, S K Banerjee and B M Moskowitz Abstract Low temperature magnetic techniques provide useful tools to detect the presence of magnetite and pyrrhotite in sediments through identification of their low temperature transitions, to determine

  • Separation of Phosphorus and Magnetic Mineral Fines

    The characteristics of siderite reductive ore and the ultrafine grindingmagnetic flocculation separation (MFS) of this ore were investigated in the present work The results indicated that the iron phase in the raw ore was predominantly metallic iron with an iron particle size below 30 μm, and the phosphorus compound was apatite

  • Selenite Reduction by Mackinawite, Magnetite and

    Suboxic soils and sediments often contain the Fe(II)bearing minerals mackinawite (FeS), siderite (FeCO3) or magnetite (Fe3O4), which should be able to reduce aqueous selenite, thereby forming solids of low solubility While the reduction of selenate or selenite to Se(0) by green rust, pyrite and by Fe2+ sorbed to montmorillonite is a slow (weeks), kinetically limited redox reaction as

  • Siderite Mineral Properties, Photos and Occurence

    Siderite is a member of calcite group minerals, which have a similar structure and form several solidsolution series The miscibility of the calcite group members is limited though Of the several possible members of the solidsolution series associated with siderite (FeCO 3), only the smithsonite (ZnCO 3), magnesite (MgCO 3) and rhodochrosite (MnCO 3) varieties are common

  • Formation of diagenetic siderite in modern

    Siderite crystals were retrieved via density separation and sorted by placing a neodymium magnet under the beaker and rinsing out the nonmagnetic fraction with deionized water Siderite imaging and elemental analysis were performed on a Zeiss Ultra 55 Plus field emission scanning electron microscope (SEM) equipped with an energydispersive X

  • Beneficiation of High‐Phosphorus Siderite Ore by Acid

    In this study, the beneficiation of high‐phosphorus siderite ore by acid leaching dephosphorization, alkaline oxide reinforced carbothermic reduction and magnetic separation is investigated X‐ray diffraction (XRD), scanning electron microscopy (SEM), and energy‐dispersive analysis (EDS) are employed to characterize the samples

  • Siderite: The mineral Siderite information and pictures

    Siderite is a common mineral and is found worldwide in many different environments Only the most noteworthy will be mentioned here Classic Siderite occurrences in Europe include Neudorf in the Harz Mountains, Germany; and Panasqueira, Portugal Excellent gemmy greenish crystals come from Isere, (especially at Allevard), France

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