Kraft pulp mills operate complex chemical processes from wood chip digestion through finished pulp. GFT9 products serve corrosion-critical functions throughout these operations.
Chlorine Dioxide Systems
ClO₂ generation, storage, and distribution represent the most demanding valve application in pulp mills. PFA-lined valves provide reliable service in:
• Generator feed systems (sodium chlorate, sulfuric acid)
• ClO₂ solution storage and transfer
• Distribution headers to bleach towers
• Safety relief and isolation systems
Bleach Plant Operations
Each bleaching stage presents different chemical challenges. PFA-lined valves handle the full range:
• D Stages: Acidic ClO₂ dosing and tower isolation
• E Stages: Caustic feed and extraction filtrate
• P Stages: Peroxide injection systems
• Stage-to-stage transfer lines
Chemical Preparation (Chem Prep)
Pulp mills typically operate internal chemical plants producing bleaching reagents. PFA-lined components serve:
• ClO₂ generators (acid feed, product handling)
• Sulfuric acid dilution systems
• Caustic preparation and distribution
• Chemical storage tank isolation
Fiberline Operations
The fiberline conveys pulp stock through washing, screening, and bleaching. Valves in filtrate systems handle weak black liquor, bleach plant filtrates, and various process streams containing dissolved organics and process chemicals.
Tall Oil Recovery
Kraft pulping produces crude tall oil as a valuable byproduct. PFA-lined valves serve separation systems where contact with acidic, organic-rich streams occurs.
