Application of magnetic separation technology for the recovery of colemanite from plant tailings

Alp, İbrahi̇m

doi:10.1177/0734242x07084614

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…These single scatter paths were treated as three degenerate single paths with degeneracy of 4, 3, and 2 for the As-O, As-B, and As-Ca paths, respectively. The fitted R As-O value, 1.65 Å, is typical of As 5+ -O distances in arsenates reported in previous EXAFS studies (Fendorf et al 1977, Waychunas et al 1993, Foster et al 1998, Moldovan et al 2003, Paktunc et al 2004, 2008, Suess et al 2009, Chen et al 2009, Jiang et al 2010. The fitted R As-B value is 5% longer than the average R B-B distance, indicating that site expansion extends to the second shell.…”

Section: Arsenic K-edge Exfas Spectramentioning

confidence: 73%

“…These deposits commonly contain abundant sulfarsenides (realgar, orpiment and arsenopyrite) and minor amounts of arsenates (teruggite and cahnite; Helvacı 1984, Helvacı & Alonso 2000. Most previous studies and remediation efforts of arsenic contamination associated with Turkish borate deposits focused on the sulfarsenides (Colak et al 2003, Delfini et al 2003, Koca et al 2003, Gemici et al 2008, Alp 2008. Flotation processes of the colemanite ores have been reported to reduce the As contents by 50 to 98% (Garrett 1998, Karagölge et al 2001, Colak et al 2003, Koca et al 2003.…”

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confidence: 95%

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Arsenic Incorporation in Colemanite From Borate Deposits: Data From Icp-Ms, -Sxrf, Xafs and Epr Analyses

Lin

Pan

Chen

et al. 2011

The Canadian Mineralogist

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World-class borate deposits in Turkey and California contain elevated concentrations of arsenic, with adverse effects to not only local suppliers of water, but also the commercial exports of boron products. Most previous studies and remediation efforts of arsenic contamination in borate deposits have focused on sulfarsenides. Inductively coupled plasma -mass spectrometry (ICP-MS) analysis and synchrotron micro-X-ray fluorescence (m-SXRF) mapping reveal that colemanite, a major borate ore mineral, contains up to 125 ppm arsenic. Arsenic K-edge X-ray absorption near-edge structure (XANES) spectra suggest the presence of both As 3+ and As 5+ species in colemanite. The data on K-edge extended X-ray absorption fine structure (EXAFS) show preferential occupancies of As 5+ and As 3+ at the tetrahedral B2 site and the triangular B1 site, respectively. Single-crystal electron paramagnetic resonance (EPR) spectra of gamma-ray-irradiated colemanite measured at 40 K contain an [AsO 3 ] 2center, providing further support for the presence of As 5+ . Therefore, colemanite is a significant source of arsenic contamination, not only in commercial boron products, but also aquifers associated with borate deposits. sommairE Les gisements de borate de Turquie et de Californie, de classe internationale, ont des teneurs élevées en arsenic, ce qui a un effet néfaste non seulement pour les fournisseurs locaux d'eau, mais aussi en matière d'exportation de produits contenant du bore. La plupart des études antérieures et les efforts de remédiation pour contrer les effets de la contamination par l'arsenic ont ciblé les sulfarséniures. Les analyses par plasma inductivement couplé avec spectrométrie de masse (ICP-MS) et au moyen de cartes de répartition acquises par micro-fluorescence X (m-SXRF) avec synchrotron révèlent que la colemanite, composant majeur du minerai boraté, contient jusqu'à 125 ppm d'arsenic. D'après les spectres montrant l'absorption des rayons X au seuil K de l'arsenic (XANES), la colemanite contiendrait à la fois As 3+ et As 5+ . Les données sur la fine structure de l'absorption des rayons X au seuil K (EXAFS) montrent un taux d'occupation préférentiel de As 5+ et As 3+ aux sites tétraédrique B2 et triangulaire B1, respectivement. Les spectres de résonance paramagnétique des électrons (EPR) acquis sur monocristaux irradiés avec rayons gamma et mesurés à 40 K montrent un centre [AsO 3 ] 2-, et fournissent donc un appui additionnel à la présence de As 5+ . Il semble donc clair que la colemanite est une source importante de contamination due à l'arsenic, non seulement dans les produits commerciaux faits de bore mais aussi dans les aquifères associés aux gisements de borate.(Traduit par la Rédaction)

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Section: Arsenic K-edge Exfas Spectramentioning

confidence: 73%

mentioning

confidence: 95%

Arsenic Incorporation in Colemanite From Borate Deposits: Data From Icp-Ms, -Sxrf, Xafs and Epr Analyses

Lin

Pan

Chen

et al. 2011

The Canadian Mineralogist

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Synthesis, Characterization, and Electrokinetic Properties of Polyindene/Colemanite Conducting Composite

Cetin

Ünal

Erol

2012

Clays and clay miner.

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The aim of the aqueous electrokinetic experiments in the present study was to assess the relative contribution of the conducting polyindene (PIn) and inorganic colemanite components to the zeta (ζ) potentials of the composite particles, thus providing further insight into their surface composition in the dispersed state and establishing colloidally stable conditions for potential rheological, industrial applications. For this, PIn and a PIn/colemanite composite (containing 5 wt.% colemanite) were synthesized by chemical oxidative polymerization using FeCl3 as an oxidizing agent. Colemanite, PIn, and PIn/colemanite composite samples were characterized by Fourier-transform infrared spectroscopy, elemental analysis, conductivity, dielectric constant, magnetic susceptibility, density, particle-size measurements, thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction analysis, and scanning electron microscopy methods. The electrokinetic properties of colemanite and PIn/colemanite composite dispersions were determined by ζ-potential measurements in aqueous medium, taking into account the effects of time, pH, various electrolytes, surfactants, and temperature. The pH was observed to have a greater effect on the ζ potentials of colemanite in water but caused only slight changes in the presence of cationic (NaCl, BaCl2, AlCl3) and anionic (NaCl, Na2SO4) electrolytes. Increased pH values shifted the ζ potentials of PIn/colemanite composite dispersions to more negative values. The most effective surfactant acting on the ζ potentials of colemanite and PIn/colemanite composite dispersions was cetyltrimethylammonium bromide (CTAB), which shifted the ζ potentials to more positive regions. Elevated temperatures caused almost no change to the ζ potentials of either the colemanite or the PIn/colemanite composite dispersions.

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A Review on the Beneficiation Methods of Borate Minerals

et al. 2021

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The modern boron applications have adsorbed the mineral processors’ attention to improve typical boron mineral’s (BM) beneficiation methods. In this regard, dry treatment and pretreatment processes—such as magnetic separation and calcination as environmentally friendly methods, due to their minimal or zero adverse effect on the environment—need more consideration. Over the years, anionic flotation has become the main technique for beneficiation of friable BMs; however, there is a gap in the investigation of cationic flotation separation since BMs’ surface negatively charges in a wide pH range. At present, enriching BMs’ flotation via surface modification is taking center stage, which can also be considered for reprocessing long-forgotten BM tailings. As a comprehensive review, this work is going to provide a synopsis of the processes, techniques, optimum parameters, and conditions—such as size reduction, zeta potential, pH, and reagents—which have been employed in the processing of BMs. Gaps in our understanding of BM’s flotation are presented in the context of addressing the existing processes, considering possibilities and rooms for efficiency improvement. Considering these gaps may improve the performance of existing methods for processing fine and ultrafine BMs, and help in the development of new technologies to improve flotation recoveries.

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Application of magnetic separation technology for the recovery of colemanite from plant tailings

Cited by 4 publications

References 23 publications

Arsenic Incorporation in Colemanite From Borate Deposits: Data From Icp-Ms, -Sxrf, Xafs and Epr Analyses

Arsenic Incorporation in Colemanite From Borate Deposits: Data From Icp-Ms, -Sxrf, Xafs and Epr Analyses

Synthesis, Characterization, and Electrokinetic Properties of Polyindene/Colemanite Conducting Composite

A Review on the Beneficiation Methods of Borate Minerals

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