In another plant with 2500t/d cement grinding capacity, switching over to high-pressure roller mills has reduced electricity consumption by more than 30% (approximately 8~ 10kWh/t cement) (NDRC, 2008. p. 48.
Grinding capacity of finish mill increases by about 30%. Up to 100% capacity increases are reported in India with the use of this approach. In China this configuration is commonly installed in new plants using dry processes and during grinding system upgrades in existing plants. It can increase grinding output by more than 100%.
Depending on flow and mould-filling characteristics, feed is introduced into the plant either via a screw feeder or a gravity-type feeder. Roller press categories are based on the relevant bearing size. The smallest type delivers a pressing force of 400 kN, while larger presses can generate a pressing force of up to 20,500 kN.
There are several ways that a roller press can be incorporated into a grinding system: As a pre-grinder, the roller press grinds fresh feed that is then finish ground in a ball mill grinding circuit. As a semi-finish grinder, the HRP-C operates in a closed circuit with a static separator and a dynamic separator, together with a ball mill.
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