CANSOLV TECHNOLOGIES INC.

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• CANSOLV TECHNOLOGIES INC.
• www.cansolv.com
• CANSOLV SO2 SCRUBBING SYSTEM
• Review of Commercial Applications
• for Smelter SO2 Emissions Control
• Presented at
• The Southern African Institute of Mining
  Metallurgy
• ZAMBIA
• By Valérie Léveillé, Eng.

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Outline

• Overview of CTI
• Description of the SO2 technology
• Review of commercial applications
• Integration to smelter emissions management.

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Corporate Profile

• Cansolv Technologies Inc. (CTI) founded in 1997
• Headquarters in Montreal, Canada
• Technology acquired from Union Carbide
• Cansolv Technologies Shenzhen (CTS) founded in
  2004
• Chinese subsidiary for Sales/Marketing
  Procurement in Asia
• Acquisition by Shell Global Solutions in December
  2008
• Chemical Initiatives appointed agents for Africa
  2009

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Corporate Profile

• SO2 Technology
• 9 Cansolv SO2 Scrubbing units in operation
• 5 Cansolv SO2 Scrubbing units to start-up in
  2009
• 5 Cansolv SO2 Scrubbing units to start-up in
  2010
• CO2 Technology
• 3 Cansolv CO2 Capture demo plants in detailed
  engineering
• Successful demonstration in 6 piloting campaigns

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CANSOLV SO2 Scrubbing System

• A regenerable SO2 absorption process
• Similar to H2S/CO2 amine treater units
• Aqueous diamine absorbent is highly selective for
  SO2
• Pure, water- saturated SO2 byproduct
• Robust, easy to operate process with low
  emissions
• Handles gas with varying SO2 concentrations
• High tolerance for dust and SO3/acid mist in gas

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Amine Characteristics

• Amine developed for oxidised environments
• Oxidation degradation losses per year lt 2 of
  annual inventory
• Very low amine volatility (ppb levels)
• Amine in salt form ? undetectable losses with
  treated gas
• High tolerance for dust ingress
• High tolerance for strong acid ingress

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SO2 Product Management

• SO2 by-product is high purity
• 99.9 SO2 dry basis, balance composed of traces
  of CO2, N2, O2
• Food grade quality SO2 product demonstrated
• SO2 product handling
• Return to new/existing sulphuric acid plant
• Return to existing sulphur recovery unit
• Compress and liquefy
• Convert to bisulfite

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How CTI Customers Handle By-Product
By-Product Profile
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Commercial Units Metallurgical and Acid Plant
Applications
Application Location Flow (Nm3/hr) By-Product Feed SO2 Conc. SO2 Emissions Status
SARP Acid Plant N/S America 40,000 H2SO4 (existing) 5,000 ppm 15 ppm Operating (s/u 2002)
Lead Smelter Asia-Pacific 34,000 H2SO4 (existing) 0.1 12.5 90 ppm Operating (s/u 2005)
Copper Anode Furnace Asia-Pacific 43,000 H2SO4 (existing) 0.09 2 50 ppm Operating (s/u 2007)
Catalyst recovery roaster N/S America 48,000 Liquid SO2/Bisulfite (new) 9100 ppm 100 ppm Operating (s/u 2008)
Sinter Machine (secondary) Asia-Pacific 350,000 H2SO4 (existing) 2400 ppm 140 ppm Start-up
Sinter Machine (primary) Asia-Pacific 2 x 510,000 H2SO4 (new) 800 ppm 40 ppm Start-Up
Lead Smelter AP Asia-Pacific 83,000 H2SO4 (new) 0.1 8 140 ppm Construction (s/u 2009)
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Active Projects Non ferrous and Acid Plant
Applications
Application Location Flow (Nm3/hr) By-Product Feed SO2 Conc. SO2 Emissions Status
Copper Smelter Furnace Asia-Pacific 95,000 sulphur (new) 15-30 250 ppm Engineering
Nickel Smelter Converter Furnace N/S America 100,000 H2SO4 (existing) 0.1 3 200 ppm Engineering (piloting campaign 2007)
Lead Sinter Machine Asia-Pacific 265,000 H2SO4 (new) 1 2 200 ppm Engineering (piloting campaign 2008)
Copper Smelter Converters N/S America 600,000 H2SO4 (existing) 4,000 ppm 200 ppm Engineering
Fertilizer Acid Plant N/S America 160,000 H2SO4 (existing) 5,000 ppm 20 ppm Engineering
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SARP Acid Plant Tail Gas

• Single absorption
• Replace alkali scrubbing process
• Modular Plant
• Absorber retrofit (FRP)

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Lead Smelter Offgas

• Batch anode furnace
• Load levelling design
• 0.1 12 SO2
• Constant SO2 production
• SO2 recycle to existing acid plant
• Main acid plant feed is roaster

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Co-gen boiler flue gas

• 965,000 Nm3/hr
• 5 absorbers, 1 regenerator
• New sulphuric acid plant
• Single absorption with Cansolv APTG

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Key Advantages in Smelter Applications

1. Suitability to treat variable and dilute (lt5)
   SO2 loads
2. Flexibility in gas cleaning design
3. Manage SO2 from multiple sources at a single site

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Treats Variable Dilute SO2 Load

• Load levelling design
• Vary lean amine flow to SO2 absorber
• Constant rich amine flow to regenerator
• Larger amine inventory
• Maintain SO2 emissions
• Decouple variable nature of smelter gas from
  sulphuric acid production
• SO2 product Sulphuric acid production are
  continuous at constant flowrate
• Eliminates need to burn sulphur to strengthen AP
  feed
• Design capacity based on average smelter SO2 load

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Flexibility in gas cleaning design

• Amine has high tolerance for dust and SO3 ingress
• Optimise between gas cleaning and amine
  purification
• Reduced gas cleaning increases amine purification
  required
• Capital/operating cost advantages often favour
  amine purification

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Flexibility in gas cleaning design
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Manage SO2 from multiple sources at a single site

• Multiple absorbers may be used with a single
  regenerator
• Several secondary sources furnaces, converters
• Acid plant tail gas has low SO2 load vs. smelter
• Leverage existing Cansolv plant to minimise capex

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Thank you!