Rotary Drum Granulator

The Rotary Drum Granulator (also called a drum pelletizer, granulation drum, or rotary pelletizer) is a large-scale, continuous agglomeration machine that transforms fine powders into spherical, uniformly sized granules inside a slowly rotating, slightly inclined cylindrical drum. As the drum rotates, pre-mixed powder and a controlled spray of water, steam, or liquid binder create nuclei that grow layer-by-layer into robust pellets — a process that mirrors natural tumbling action at industrial throughput. Unlike disc pan granulators that rely on open-air classification, the rotary drum granulator uses an integrated trommel or external screening system to recycle undersize and oversize material back into the drum, ensuring a finished product with exceptionally consistent size and high crush strength. This equipment is the backbone of high-capacity NPK fertilizer plants, iron ore pelletizing lines, and mineral processing operations worldwide. With options for rubber or alloy steel liners, high-efficiency spray lances, and a choice of gear-driven or friction-driven rotation, our rotary drum granulator delivers decades of reliable service under the most demanding conditions.

• Massive Throughput for Industrial-Scale Production: Single units handle 5 to 50 tons per hour, far surpassing the capacity of disc pan granulators. For large fertilizer complexes and ore pelletizing plants, one rotary drum replaces multiple smaller machines, reducing capital cost, footprint, and operator count.

• Consistently High Pellet Quality & Size Control: An integrated trommel screen at the drum discharge end (or a separate vibrating screen) continuously separates correctly sized pellets from over- and under-size material. Oversize is crushed and returned with the undersize seeds back to the drum feed, maintaining a steady-state granulation loop that consistently yields over 90% on-spec product.

• Superior Pellet Strength Through Steam & Liquid Optimization: Optional steam injection into the powder bed preheats and partially plasticizes the material, dramatically improving green pellet strength and reducing downstream drying requirements. The multi-spray lance system applies binders or water at precisely the right locations along the drum length for maximum nucleation and growth efficiency.

• Robust Mechanical Design for Non-Stop Operation: The drum shell is rolled from thick carbon steel plate and supported on two heavy-duty riding rings and trunnion rollers. The main drive uses a hardened ring gear and pinion (or friction drive with rubber-lined rollers) with a variable frequency drive for smooth speed control. Oversized spherical roller bearings on the trunnions accommodate both radial and axial loads.

• Wear Protection Tailored to Your Material: The internal drum surface is protected with replaceable rubber liners (ideal for sticky fertilizers and non-abrasive powders), high-manganese steel liners (for abrasive ores), or a combination of both. Internal scrapers prevent material buildup on the drum wall, ensuring consistent bed depth and granulation conditions.

• Energy-Efficient Operation: The drum rotates at a low speed (typically 5–15 rpm), consuming far less power per ton than high-speed mixers or extruders. A 30–75 kW motor drives up to 20–30 tons per hour, keeping operating costs exceptionally low.

• Flexible Integration into Complete Plants: We supply the rotary drum granulator as a standalone unit or as part of a complete granulation line including pre-mixer, dryer, cooler, screens, crushers, and recycle conveyors — all engineered to your specific production goals.

Proven Performance in High-Capacity Plants Worldwide
Based on operational data from 120+ rotary drum granulator installations in NPK fertilizer plants, iron ore pelletizing complexes, and mineral agglomeration facilities (2022–2024):

• On-Spec Product Exceeds 90%: With integrated trommel screening and controlled recycle loops, plants routinely achieve 90–95% of granules within the target size range, minimizing off-spec waste and maximizing saleable output.

• Steam Injection Boosts Green Pellet Strength by 25–40%: Fertilizer plants using steam preheating in the drum report significantly higher green crush strength, reducing breakage during drying and screening, and enabling production of harder, more marketable granules.

• Liner Life of 18–36 Months: Rubber liners in NPK fertilizer service routinely last 2–3 years; high-Mn steel liners in abrasive iron ore duty deliver 18–24 months. Modular liner replacement allows partial changes without dismantling the drum.

• Investment Payback in 10–18 Months: A single ZG-2.4×8 granulator producing premium NPK compound fertilizer generates sufficient product premium and throughput to recover its full installed cost within the first 12–18 months of operation.

• Better Than 95% Mechanical Availability: The simple, robust design with no internal moving parts and low-speed rotation results in over 340 days of uptime per year, with only scheduled lubrication and periodic scraper/liner checks.

Applications: What Can Your Rotary Drum Granulator Process?
Our Rotary Drum Granulator is the primary large-scale agglomeration solution for:

• NPK & Compound Fertilizers: Urea, ammonium phosphate, potash, and micronutrients blended and granulated into 2–5mm uniform compound granules for bulk blending and precision agriculture.

• Organic & Bio-Organic Fertilizers: Composted animal manure, municipal sludge, peat, and beneficial microbial inoculants pelletized into organic soil conditioners and slow-release plant food.

• Iron Ore Concentrates: Magnetite and hematite fines agglomerated into green balls for blast furnace and direct reduction iron (DRI) pelletizing plants.

• Ferroalloy & Metal Powders: Manganese ore, chromite, nickel laterite, and steel plant by-products (BF dust, BOF sludge, mill scale) pelletized for smelting or recycling.

• Industrial Minerals: Phosphate rock, bauxite, fluorspar, bentonite, and other mineral fines requiring dust-free transport or calcination feed preparation.

Customize Your Rotary Drum Granulator System
Tell us your material type, required daily output, and plant layout. We will engineer the complete system:

• Drum Diameter & Length: From ZG-1.2×4 (5–8 t/h) to ZG-3.5×12 (40–60 t/h), sized for your capacity

• Liner Type: Rubber (fertilizer), high-Mn steel (ore), 304/316L stainless (corrosive), or a combination

• Spray & Heating: Water, binder solution, or steam injection with automated flow control

• Drive Configuration: Gear and pinion, chain drive, or friction drive with VFD

• Screening & Recycle: Integrated trommel screen or external vibrating screen + crusher circuit

• Complete Plant: We supply the full line — mixer, dryer, cooler, screens, crusher, recycle conveyors, and bagging system
  Standard rotary drum granulators ship in 30–45 working days. Complete engineered plants in 60–90 working days.

  
  

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