CIMMA ROTODUE 4C Twin-Rotor Hammer Mills with Dynamic Classifier

Simultaneous grinding and drying

For grinding friable materials of medium hardness and abrasiveness, such as carbon coke, petroleum coke, calcium carbonate, dolomite, calcium oxide, magnesium oxide, gypsum and clays.

ROTODUE-4C

The CIMMA ROTODUE 4C hammer mill is suitable for producing air-classified powders with granulometry in the range 0 to 100÷300 μm, with d50 in the range 10÷40 μm.

Product fineness is easily adjustable by varying the speed of the dynamic air classifier, with speed controlled by inverter. The discharge of the product is pneumatic in air stream; therefore the mill is specially suitable for the operation with hot gases (drying-grinding process).

This allows a partial drying of moist materials during the grinding operatio that results in tremendous savings in operating costs and reduction of necessary space, when compared with plants where drying is made in separate equipment before grinding.

Typical applications

The main application fields are the production of filler of:

  • Calcium carbonate sub-100 μm
  • Calcium oxide
  • Low abrasive minerals
  • Talc
  • Gypsum
  • Barite
  • Magnesium oxide
  • Petroleum coke and/or coal 97% sub-90 μm, for plants using solid fuels
  • Clays for single-fired ceramic tiles

Construction features

  • Body: is made of welded steel plate of high thickness, fully protected inside by replaceable wear-resistant plates.
  • External bearings: grease-lubricated and enclosed in dust-tight supports.
  • Toothed grinding plates made of wear-resistant steel
  • Standard multi-disc rotor: hardox material with swinging hammers
  • Heavy-duty drum-type rotor: type XP with fixed hammers
  • Hammers: made of cast high-chromium alloy

Technical specifications

ROTODUE 4/C technical specifications