Light Metals 2013 pp 1069-1073 | Cite as

A Method for the Rapid Characterization of Petroleum Coke Microstructure Using Polarized Light Microscopy

  • Andris Innus
  • Alain Jomphe
  • Hans Darmstadt
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Petroleum coke is used for the fabrication of anodes for aluminum reduction cells. There are ever-increasing economic and supply availability pressures for alternative and multiple sources and qualities for fabricating anodes, and therefore for cost effective characterization to make timely adjustments of the anode mixes. One characteristic historically acknowledged as having a significant detrimental influence on anode thermo-mechanical properties is the so-called isotropic structure. Traditionally such characterizations using optical microscopy are exhaustive and therefore cause a throughput concern. A method was developed and successfully applied to green and calcined coke reducing the interpretation time of a sample down to about twenty minutes. The sample preparation and interpretation methodology is described and examples presented, including a case study of how the method was used to guide raw material blend decisions across Rio Tinto Alcan’s North American sites.

Keywords

Coke Anode Structure Microscopy 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Stewart, M. “Petcoke Industry Overview: A Growing Market in a Shrinking World”, 11th Annual Petcoke Conference, Orlando, Fl, USA, 2012.Google Scholar
  2. 2.
    J. P. Schneider, B. Coste., “Thermal Shock of Anodes: Influence of Raw Materials and Manufacturing Parameters”, Light Metals, 1993, 611–619.Google Scholar
  3. 3.
    L. C. Edwards et al., “Evolution of Anode Grade Coke Quality”, Light Metals, 2012, 1207–1212.Google Scholar
  4. 4.
    L. C. Edwards et al., “Use of Shot Coke as an Anode Raw Material”, Light Metals, 2009, 985–990.Google Scholar
  5. 5.
    “ASTM D5061, Standard Test Method for Microscopical Determination of the Textural Components of Metallurgical Coke”, Document of ASTM International, West Conshohocken, PA, USA, 2007.Google Scholar
  6. 6.
    A. Oya, Z. Qian, H. Marsh., “Structural study of cokes using optical microscopy and X-ray diffraction”, Fuel, 1983, 62, 274–278.CrossRefGoogle Scholar
  7. 7.
    M. Hole, A. Øye, T. Foosnæs., “Relationship Between Thermal Expansion and Optical Texture of Petrol Coke”, Light Metals, 1991, 575–579.Google Scholar
  8. 8.
    R. J. Tosta, E. M. Inzunza., “Structural Evaluation of Coke of Petroleum and Coal Tar Pitch for the Elaboration of Anodes in the Industry of the Aluminum”, Light Metals, 2008, 887–892.Google Scholar
  9. 9.
    J. L. Eilertsen et al., “An automatic image analysis of coke texture”, Carbon, 1996, 34, 3: 375–385.CrossRefGoogle Scholar
  10. 10.
    D. Bellot et al., “Automatic Measurement of Coke Texture by Image Analysis”, Light Metals, 1992, 659–663.Google Scholar
  11. 11.
    Escallón, M. M., “Petroleum and Petroleum/Coal Blends as Feedstock in Laboratory-Scale and Pilot-Scale Cokers to Obtain Carbons of Potentially High Value”, Ph.D. Thesis, State Collage, Pennsylvania State University, State College, PA, USA, 2008.Google Scholar
  12. 12.
    K. Neyrey et al., “A Tool for Predicting Anode Performance of Non-Traditional Calcined Cokes”, Light Metals, 2005, 607–612.Google Scholar
  13. 13.
    H. Marsh, C. Calvert, J. Bacha., “Structure and formation of shot coke — a microscopy study”, Journal of Materials Science, 1985, 20, 289–302.CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2016

Authors and Affiliations

  • Andris Innus
    • 1
  • Alain Jomphe
    • 1
  • Hans Darmstadt
    • 1
  1. 1.Arvida Research and Development CentreRio Tinto AlcanJonquièreCanada

Personalised recommendations