TMS 2014 Short Course - Pot Ventilation & Dry Scrubbing Operations for Aluminium Smelters.


When: Sunday, February 16, 2014


Margaret M. Hyland – LMRC, University of Auckland

Stephan Broek – Hatch

Jim Metson – LMRC, University of Auckland

David S. Wong – LMRC, University of Auckland


LMRC and Hatch are providing a one-day short course entitled “Pot Ventilation & Dry Scrubbing Operations for Aluminium Smelters” as part of the continuing education workshop and short courses series held in conjunction with the TMS 2014 Annual Meeting & Exhibitions.


Course Overview

This one-day short course will focus on the operation of pot ventilation and dry scrubbers in the primary aluminium smelting industry, covering fundamentals/theory of operations, key performance indicators, best practices and upcoming advancements in technology. 


Who Should Attend and Benefit?

This course is ideal for technical and environmental personnel, engineers and managers in the primary aluminium smelting industry who are interested in their Pot Ventilation and Dry Scrubbing (or Gas Treatment Centre) operations. The course will not only provide attendees with further understanding in how their integrated ventilation system and dry scrubbers work, but also insight into how to maximise and maintain the efficiencies of their current scrubbing installations, and what options they have for future expansions or modifications.


Course Outline


  • Pot emissions

  • Environmental regulations and permits

  • History of GTCs

Fluoride Emissions

  • The gaseous and particulate forms of fluorides

  • Mechanisms of capture for both gaseous and particulate fluorides

Scrubber Designs & Technologies

  • Dry scrubbers: torbed, fluidised bed, BUT FOCUS ON pre-injector + bag-house dry scrubbers operating on prebake smelter, NOT soderberg (Which would include PAHs)

  • Wet scrubbers: past & future (SOx emissions)

  • Key operating areas of the GTC

  • Gas flow

    • Cell ventilation & pot draft

    • Gas duct inlet from cells

    • Gas fans & design

    • GCT stack & silencers

  • Alumina flows

    • Alumina pre-injection & secondary injection points

    • Primary/secondary alumina recycle ratio

    • Baghouse & bagfileters, air-to-cloth ratio

    • Alumina transport – air slides & air lifts

    • Alumina storage – silos

  • Filtration

    • Basic of filtration

Key Parameters, Maintenance Practices & Issues for Dry Scrubber

  • Stack emission monitors – particulate, HF, multi-channel, stack sampling

  • Gas flowrate & gas pressure drops across GTC

  • Ensuring alumina supply for injection

  • Gas fan performance

  • Inlet duct gas temperature & considerations, rising line amperage, Middle Eastern countries, etc.

  • Filter bag performance & replacement

  • Hard gray scale (gas ducting)

  • Airslides/air lifts => finer/scale

  • Silo level control => alumina fines

Practical Tips to Evaluate GTC Technologies in Bidding Stage Advancements & Developments in Dry Scrubbing

  • High draft ventilation (principles, effect on emissions, technologies: dual duct, single duct, jet induced)

  • Extended surface filter bags

  • Technologies for managing Duct Gas Temp Cooling/Heat Exchangers [HEX technology, evaporative cooling, air dilution]

  • Use of multi-channel lasers for optimisation of individual GTC filter compartments

  • Future requirements for SOx emissions

Group Discussions


For more information and registration, refer to the following webpage: