Chapter 4. New Dual Bag Nozzle System

  1. John B. Wachtman Jr.
  1. Andrew B. Cecala1 and
  2. Edward D. Thimons2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470310526.ch4

Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 10, Issue 1/2

Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 10, Issue 1/2

How to Cite

Cecala, A. B. and Thimons, E. D. (1989) New Dual Bag Nozzle System, in Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 10, Issue 1/2 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310526.ch4

Author Information

  1. 1

    Pittsburgh Research Center Bureau of Mines Pittsburgh, PA

  2. 2

    Pittsburgh Research Center Pittsburgh, PA

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780470374832

Online ISBN: 9780470310526

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Keywords:

  • dual bag n o d system;
  • rooster tail;
  • fill station;
  • exhaust system;
  • minerals-processing plant

Summary

A new dual bag nozzle system has been designed, tested, and shown to effectively reduce worker's exposure to the dust associated with the bag filling process at mineral processing plants. This system is composed of a nozzle within a nozzle. The inner nozzle is used to fill the bag with product. The outer nozzle exhausts excess air from the bag after filling is completed. This depressurizes the bag and reduces product loss through the bag valve during ejection from the fill station and during the conveying process. An improved bag clamp also reduces product blowback during bag filling. Dust reductions of 80–90% have been achieved for both the bag operator as well as workers loading the bags onto pallets. There has also been a 90% reduction in product blowback during bag filling which can account for tremendous product savings.