Tumblers (granulation / calcination / coating)
Tumblers (granulation / calcination / coating)

Granulation / calcination / coating


  • 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.



  • 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.