Cement Grinding Aids

Principal application is to increase output (tons/hour) at constant cement fineness (cm2/g)

Introduced at low dosage, usually

  • between 0.01 and 0.10% (most preferably at 0.01 – 0. 1%)

Influence on cement quality is usually small (or) not the main aim of its application.

These products are based on glycol and amine chemistry.

  • CGA reduces the inter-particle attractive forces of cement which causes agglomeration of cement grains.
  • CGA are adsorbed on the newly created surface, neutralising electrical charges and thus reducing their tendency to re-agglomerate. Hence, the cement grains show a lower resistance to comminution.

These provides benefits to grinding efficiency by

  • Reduction in agglomeration and coating of the mill internals.
  • Improved dispersion of feed to the separator - Increased separator efficiency and lower by-pass.
  • Reduction in the mill filling level.
  • This theory is proved by the fact that all the chemicals which are affecting the grinding process have strong polar characteristics.
Without Cement Grinding Aid
With Cement Grinding Aid
  • CGA acts on stabilizing the grinding bed in the Vertical Roller Mills.
  • At same time, CGA prevents air entrainment in the bed, thus reducing drastically mill vibrations.
  • Furthermore, due to the addition of CGA, the amount of water required to achieve this effect is much lower – Results in improved strengths performance & requires lesser heat demand for drying.
    (increased amount of water in the bed results in lower strengths and higher heat demand essential for drying the ground cement).
  • Improvement in Grinding Efficiency.
  • Better Particle Size Distribution - Narrower PSD.
  • Increment in Mill Output.
  • Reduction in Specific Power (kWh/ton) of Grinding.
  • Reduction in Mill Run Hours.
  • Improvement in Cement Handling Characteristics.
  • Increment in Cement Flowability & Reduction in Pack-Set.
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