CGB-Lab test 1 ( Power saving effect)
As CGB technology has increasingly caught the eyes of the global cement industry thanks to its remarkable performance in power saving,we’d like to share the lab test a couple years ago ( 2016 ) in China, which gives better picture on how to put this new technology into use properly after replacing steel ball.
φ700mm×700mm Lab Batch mill
It is equiped with torquemeter that can read the power consumption directly.Below is the technical parameter tables:
Mill Shell Dimension
|φ700×700mm （Effective. 600×600mm）|
XW‐6‐35 Raito:( 29：1)
Inner liners drawing:
2.Clinker and FGD gypsum
Literally minimum 2 raw materials shall be used. However in order to avoid deviation due to heterogeneous mixture , one-component clinker was applied as raw materials during the test. When it came to the cement quality test, ground FGD ( Fuel Gas Desulfurization)gypsum is blended for various performance test.The technical data of the raw materials are as follow:
Clinker bond: 13.3kWh/t
Milling method:Roller press
Clinker Blaine: 1133cm2/g
Clinker fineness: R45um=57%
FGD gypsum blaine:9460cm2/g
3.Mill loading rate ( CGB -ceramic ball Vs steel ball)
During the test, both CGB and steel balls were set with loading rate at 24% with media scheme as below:
( steel balls=174kgs,CGB= 84kgs, clinker charge=20kg/ each time)
Power consumption rate comparison:
Below chart demonstrate the power consumption variation curve:
（Comparison between CGB and Steel ball）
Above chart suggests that given equal loading rate and rotation speed,CGB enjoy competitive edge in power consumption when the blaine is lower than 3300 cm2/g. However, when the blaine is higher than 3300cm2/g, the CGB doesn’t look better in power saving performance. It even goes higher.
Below table shows @ 40.5 rpm running rate , the relation between blaine and power saving rate when the blaine target is less than 3300cm2/g.
Based on this table, it suggests that for cement product @ same blaine, the CGB grinding will witness a power saving rate from 3.7-14.6% by contrast with steel balls. The higher blaine target,the lower the power saving rate.
Above test result is on the basis of same loading rate of grinding media ( both are at 24% ).This is the reason why when CGB technology is applied to replace steel balls, the loading rate must be set higher than steel balls so as to keep the power saving advantage.
In next article introducing lab test serie-2, we are going to share the comparison between various grinding media on cement residue.