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Effect of Oleate/Bacteria Interactions on Dolomite Separation from Phosphate Ore

  • A. M. Elmahdy , A. A. El-Midany , N. A. Abdel-Khalek und S. E. El-Mofty
Veröffentlicht/Copyright: 5. April 2013
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Abstract

In conventional flotation, the sodium oleate is used as a collector for phosphate separation from silica. However, most of the phosphate deposits contain carbonate impurities, which deteriorate the flotation selectivity using sodium oleate. In this paper, the amenability of the carbonate separation from a sedimentary phosphate ore through bio-flotation process, as a one of various efforts to solve the carbonate problem, was tested. The interaction of two types of bacteria (Corynebacterium-diphtheriae-intermedius, CDI, and Pseudomonas aeruginosa, PA) with sodium oleate was investigated. The interaction between collector and bacteria was determined by Fourier Transform Infra-Red (FTIR) measurements, zeta potential before and after adsorption of bacteria, as well as frothing power. The results showed that bio-flotation could produce a phosphate concentrate of 0.85% MgO and 30.2% P2O5 with a recovery of 92% at pH 5.5, 1.25 kg/t sodium oleate, ≥ 1 × 108 cells of CDI bacteria. The specification of such concentrate could not be obtained by the conventional flotation experiments, in absence of bacteria, under similar conditions. This means that bacteria could play a significant role as a surface modifier due to its selective adsorption onto the mineral surface as well as its interaction with collector.

Kurzfassung

Bei der konventionellen Flotation wird Natriumoleat als Kollektor für die Phosphattrennung von Silica eingesetzt. Allerdings enthalten die meisten Phosphatvorkommen Carbonatverunreinigungen, die bei Verwendung von Natriumoleat das Trennungsvermögen der Flotation verschlechtern. In der vorliegenden Arbeit wurde untersucht, ob das Carbonatproblem mittels Abtrennung des Carbonats vom sedimentären Phosphaterz über einen biologischen Flotationsprozess gelöst werden kann. Es wurde die Wechselwirkung zweier Bakterientypen (Corynebacterium-diphtheriae-intermedius, CDI und Pseudomonas aeruginosa, PA) mit Natriumoleat untersucht. Für die Bestimmung der Wechselwirkung zwischen Kollektor und Bakterien wurden folgende Messmethoden eingesetzt: Fourier-Transformation Infrarot (FTIR)-Messungen, Zetapotential vor und nach Bakterienadsorption und Schaumvermögen nachgewiesen. Die Ergebnisse zeigen, dass die biologische Flotation eine Phosphatkonzentration von 0,85% MgO und 30,2% P2O5 erzeugen kann, mit einer Ausbeute von 92% bei pH 5,5, 1,25 kg/t Natriumoleat, = 1 × 108 Zellen von CDI Bakterien. Eine derartige Konzentration kann in Abwesenheit von Bakterien unter ähnlichen Bedingungen mit konventionellen Flotationsversuchen nicht erreicht werden. Dies bedeutet, dass Bakterien aufgrund ihrer selektiven Adsorption auf die Mineraloberfläche sowie ihrer Wechselwirkung mit dem Kollektor eine signifikante Rolle als Oberflächenmodifikator spielen können.

Key words:: Dolomite; apatite; sodium oleate; bacteria; bio-beneficiation; bio-flotation; carbonate minerals; phosphate
Stichwörter:: Dolomit; Apatit; Natriumoleat; Bakterien; biologische Reduktion; biologische Flotation; Carbonatmineralien; Phosphat
∗ S. E. El-Mofty, Dept. of Mining Engineering, Faculty of Engineering, Cairo University, Giza, Egypt, Tel.: 202-35678526, Fax: 202-35723486, E-Mail:

Mr. A. Elmahdy is currently a graduate student at Mcgill University, Canada. His experience is focused on mineral sepration and surfactant selectivity. His master thesis studied the effect of bacteria on the improving the separation selectivity.

Dr. A. El-Midany has graduated from Materials science and engineering, University of Florida. He has a good experience in the field of applied surface chemistry, polymer science and engineering, ceramics as well as environmental issues related to materials and mineral conservation. His experience is extended to use of polymers and their membranes in the coating of surfaces on the purpose of modification and protection.

Prof. N. A. Abdel-Khalek is currently professor of Mineral Technology at Central Metallurgical R&D Institute (CMRDI). His research activities focused on surface coating, utilization of bacteria in mineral processing.

Prof. S. El-Mofty is currently professor of surface chemistry and mineral engineering at Faculty of Engineering, Cairo University. His research activities are in stone conservation, surfactant and polymeric coating, mineral processing.

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Received: 2008-10-27
Revised: 2009-07-22
Published Online: 2013-04-05
Published in Print: 2009-11-01

© 2009, Carl Hanser Publisher, Munich

Artikel in diesem Heft

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Application
  6. Ultrasonic Assisted Finishing of Cotton with Nonionic Softener
  7. Effect of Oleate/Bacteria Interactions on Dolomite Separation from Phosphate Ore
  8. Environmental Chemistry
  9. Automated Determination of Linear Alkylbenzene Sulphonate (LAS) in Wastewater Treatment Plants Effluents Using on Line Solid-phase Extraction Followed by HPLC with Fluorescence Detection
  10. Novel Surfactants
  11. Effect of Calcium Ions Concentration on the Foaming Power of Anionic Surfactants
  12. Lauryl Trimethyl Ammoniums with New Type Counteranions
  13. Physical Chemistry
  14. Extraction of Copper(II) from Sulphate Aqueous Medium with N,N′-bis(2-hydroxy-1-naphthalideneaminoethyl)amine Polydentate Schiff Base in Aqueous Two-phase Micellar of Non-Ionic Surfactant
  15. Effect of Cellulase Enzyme on Cellulose Nano-topography
  16. Review
  17. Synthesis, Structural Properties and Applications of Gemini Surfactants: A Review
https://doi.org/10.3139/113.110039
Schlagwörter für diesen Artikel
Dolomite; apatite; sodium oleate; bacteria; bio-beneficiation; bio-flotation; carbonate minerals; phosphate

Artikel in diesem Heft

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Application
  6. Ultrasonic Assisted Finishing of Cotton with Nonionic Softener
  7. Effect of Oleate/Bacteria Interactions on Dolomite Separation from Phosphate Ore
  8. Environmental Chemistry
  9. Automated Determination of Linear Alkylbenzene Sulphonate (LAS) in Wastewater Treatment Plants Effluents Using on Line Solid-phase Extraction Followed by HPLC with Fluorescence Detection
  10. Novel Surfactants
  11. Effect of Calcium Ions Concentration on the Foaming Power of Anionic Surfactants
  12. Lauryl Trimethyl Ammoniums with New Type Counteranions
  13. Physical Chemistry
  14. Extraction of Copper(II) from Sulphate Aqueous Medium with N,N′-bis(2-hydroxy-1-naphthalideneaminoethyl)amine Polydentate Schiff Base in Aqueous Two-phase Micellar of Non-Ionic Surfactant
  15. Effect of Cellulase Enzyme on Cellulose Nano-topography
  16. Review
  17. Synthesis, Structural Properties and Applications of Gemini Surfactants: A Review
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