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Flyash Grinding

The ufg mill^®, a dry fine grinding media mill when operated in closed circuit with a high efficiency air classifier is capable of grinding power station fly ash to extremely fine levels.

Ultrafine fly ash has proven very effective as a cement performance enhancer offering improved strength, permeability and corrosion resistance properties.

Grinding of Fly ash can be broadly divided into two categories.

Fine grinding

In some cases power station fly ashes are not of the required fineness to be used for cement addition. Alternatively the ash may have been air classified removing the available fines.

In either case the ufg mill^®  is employed to to grind ash nominally to 45 microns top size. This may be 80 to 95% passing 45 microns.

Ultrafine Grinding

Fly ash ground to ultrafine levels takes on many improved properties over normal ash. Ultrafine fly ash can be defined as d50 = 8 microns or less. With a top size in the range of 30 to as low as 5 microns.

Ultrafine ground fly ash is an effective replacement for silica fume.

ufg mill^® with high efficiency air classifier

Fly ash feed 150 micron    Ground fly ash 5 micron

Plant Layout  600 HP dry grinding mill with two ACS-50TD air classifiers