Granulation / calcination / coating

Manufacturer: Comspain S.A.

Application:

• processes: granulation, calcination, coating
• materials: fertilizers, minerals, chemical substances, food products (fruits, vegetables), granulated or dusty solid products, industrial solid wastes, limestone, ores, oxides, dolomites, talc, rubber, fibers

Specification:

• granulation
  • drum granulators: chemical, food, fertilizer industry
  • length/diameter ratio up to 2.8-10 revolutions per min., time of stay (2-3 min.) dependant on inclination
  • internally rubberized to protect against abrasion, high temperature up to 180 C, acids, agglutination
  • drum equipped with suspension injectors, gas inlet/outlet
• coating
  • application: coating of granulated fertilizers (liquids: oil, amines, solids: talc, diatomaceous earth)
  • purpose: improving granulate surface and protection against agglutination
  • drum's initial zone is equipped with spirals (cutters) which facilitate insertion of a product,
  • subsequent zone contains low mounted cutters to ensure easy pouring and even impregnation of a coated product
  • fluid coating: 1 to 4 coating nozzles, coating with loose material: dosage with a feeding screw (removable)
• calcination
  • operation in counter-current (maximum gas temperature in the final part of the drum - 900 to 1100 C), this ensures material's moisture content at dumping at 0%
  • execution: steel lined with fireproof material, with burner in a drum (fly ash)
  • drum equipped with spirals and hooks of boiler steel, with axial combustion chamber mounted in a drum (washed phosphates)
  • combustion chamber placed on wheels or rails in order to separate it from the drum, also to facilitate access
  • dumping box limits entrainment of fine particles
  • external drive resistant to temperature by default