Advertisement

Flotation of Low Volatile Coking Coal Fines

  • Sumantra Bhattacharya
  • Divya Jyoti
  • Laxmikanta SahuEmail author
  • Shobhana Dey
  • Harish Singh
Technical Paper

Abstract

Low volatile coking (LVC) coal reserves have become the key for sustaining the coking coal production in India. Because of high ash content and difficult washability characteristics coking coal in India is usually cleaned at 16–18% ash content. To obtain a reasonable yield at this ash level, LVC coal needs to be crushed to less than at least 13 mm before cleaning. LVC coal when crushed to −13 mm, depending on HGI and crushers used fines (−0.5 mm) could constitute 15–25% of the crushed coal. Limited study has so far been done on flotation characteristics of LVC coal fines, though flotation is the only method used in India to clean the coking coal fines. The work presented here after discusses the difficulties associated with the flotation of LVC coal fines arising out of its petrographic composition, complicated liberation characteristics, collector dependency, etc.

Keywords

LVC coal Release analysis n-Dodecane Hydrophobicity Selectivity 

References

  1. 1.
    Dey S, A Comparative Study of Frother Performance in Coal Flotation, PhD Thesis, Indian School of Mines (2004).Google Scholar
  2. 2.
    SAIL (Steel Authority of India Ltd), Personal Communication (2009).Google Scholar
  3. 3.
    Gouricharan T, Sharma K K, Chattopadhyay U S, Sinha K M K, Chattopadhyay P C, Jha G S, Kabiraj S K, Haldar D D, Das T K, and Ghosh N K, in International Conference on Coking Coals and Coke Making: Challenges and Opportunities, Washability and Pilot Plant Studies to Generate Bulk Cleans at Desired Qualities from LVC Coal of Jharia Coalfields, (eds) Vijayavergia R K, Ray J K, Tirkey S, Viva Books, New Delhi (2009), p 219.Google Scholar
  4. 4.
    Bhattacharya S, Personal Research (2009).Google Scholar
  5. 5.
    Dell C C, Release analysis, A new tool for ore dressing research, in recent developments in mineral dressing, IMM (1953) p 75.Google Scholar
  6. 6.
    Dell C C, J Inst Fuel 37 (1964) 149.Google Scholar
  7. 7.
    Cavallaro J A, and Deurbrouck A W, Froth Flotation Washability Data of Various Appalachian Coals Using the Timed Release Analysis Technique, USBM Report of Investigation No. 6652 (1965).Google Scholar
  8. 8.
    BS 7530, Methods for Froth flotation testing of hard coal, Part 2, Evaluation of flotation characteristics, published by British Standard Institution, London (1994).Google Scholar
  9. 9.
    Nicol S K, Bensley C N, The K C, and Firth B A, The Estimation of Coal Flotation Response, Proceedings, Congress for Improving Froth Flotation of Coal, (ed) Membrey W, Australian Coal Industry Research Laboratories, (1983) p 116.Google Scholar
  10. 10.
    Forrest W R, Adel G T, and Yoon R H, Coal Prep 14 (1994) 13.CrossRefGoogle Scholar
  11. 11.
    Mohanty M K, Honakar R Q, and Ho K, Coal Prep (1998) 19.Google Scholar
  12. 12.
    Brown D W, and Hall S T, Fuel 78 (1999) 1621.CrossRefGoogle Scholar
  13. 13.
    Arnold B J, and Aplan F F, Fuel 68 (1989) 651.CrossRefGoogle Scholar
  14. 14.
    Sen K, and Choudhuri S G, Beneficiation of Difficult to Wash Coals: Development and Prospects, XII International Coal Preparation Congress, (ed) Blaschke W S, Gordon and Breach, Amsterdam (1994), p 957.Google Scholar
  15. 15.
    Singh A K, Sahay A N, and Mishra H K, , MineTech 32 (2011) 3.Google Scholar
  16. 16.
    Chattopadhyay U S, Singh K M P, Kabiraj S K, Choudhuri S, Sharma K K, and Gouricharan T, Beneficiation of Difficult to Wash Indian Coking Coal- Challenges before Indian Steel Sectors, XXV International Mineral Processing Congress, New Delhi (2012), paper no. 961.Google Scholar
  17. 17.
    Caldeira J, and Redonda V, Low Volatile Jellinbah Semi Soft Coking CoalAn Alternative Coal for Coke Blending, Jellinbah Resources Pty Ltd. CAN 010825205 (1998). www.jellinbah.com.au.
  18. 18.
    Arnold B J, and Aplan F F, Coal Froth Flotation: The Response of Coal and Mineral Particles to Reagent and Circuit Variations, Advances in Mineral Processing, Society of Mining Engineers (1986), p 351.Google Scholar
  19. 19.
    Aplan F F, Min Eng 45 (1993) 83.Google Scholar
  20. 20.
    Malvadkar S B, Forbes S, and Mc Gurl, G V, Coal Resources: Formation of. In: Encyclopedia of Energy, (ed) Cleveland C J, Elsevier, New York (2014), p 529.Google Scholar
  21. 21.
    Divya Jyoti, Characterization and assessment of beneficiation and utilization potential of selected seams of low volatile coking coal of Jharia and Bokaro coalfield, PhD thesis, Indian School of Mines, Dhanbad (2016).Google Scholar

Copyright information

© The Indian Institute of Metals - IIM 2016

Authors and Affiliations

  • Sumantra Bhattacharya
    • 1
  • Divya Jyoti
    • 1
  • Laxmikanta Sahu
    • 1
    Email author
  • Shobhana Dey
    • 2
  • Harish Singh
    • 1
    • 3
  1. 1.Department of Fuel and Mineral EngineeringIndian School of MinesDhanbadIndia
  2. 2.Mineral Processing DivisionCSIR-National Metallurgical LaboratoryJamshedpurIndia
  3. 3.All MineralKolkataIndia

Personalised recommendations