ball filling degree mill calculation
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Annex 16.1
CMCALC2.XLS Ver.2.0/PWi/05.07.2001 Holcim Group Support Ltd / CTS
Mill calculation
Plant : Date :
Mill : Visa :
Mill Dimensions
Diameter D 4.20 [m]
Length L 13.00 [m]
Motor power (inst.) P 3,550 [kW]
L/D - Ratio 3.1 [-]
Compartment lengths L1 21 [%]
L2 79 [%]
Data 1.Comp. 2.Comp.
Internal diameter D i 4.08 4.08 [m]
Internal length L i 2.70 10.02 [m]
Filling degree f 28.8 25.6 [%]
Spec. media weight 4.60 4.60 [t/m3]
Mill speed n 15.8 [min-1]
Drive efficiency mech. 0.960 [-]
Drive efficiency electr. 0.950 [-]
Mill throughput G 145 [t/h]
Fineness product Blaine 3,700 [cm²/g]
Residue [%] 32 [µm]
Relative mill speed %n crit 75.4 [%]
Factor c 0.231 0.230 [-]
Media weight Q 46.8 154.3 [t]
Motor power abs. P mec 696 2,286 [kW]
Spec. energy consumption E sp 4.8 15.8 [kWh/t]
Media weight total Q tot 201 [t]
Motor power mech. abs. Pmec 3,107 [kW] motor shaft
Motor power electr. abs. P el 3,270 [kW] electr. counter
Spec. energy consumption E sp 22.6 [kWh/t]
Energy utilization w 45.6 [cm²/J]
Filling Degree Calculations 1.Comp. 2.Comp.
Mill Internal diameter Di 4.08 4.08 [m]
Free Height h 2.76 2.76 [m]
In / Outlet Diameter d 1.40 1.40 [m]
Filling Degree Present f pres. 28.0 28.0 [%]
Maximum f max. 28.6 28.6 [%]
H/D - Ratio 0.68 0.68 [-]
Free Height max. 2.74 2.74 [m]
Annex 16.2
CC-99003.dsf
Kma 5.1.99
Tube Mill Dimensioning
h
Di = Mill diameter
20 25 30 35
filling degree [%]
h
D
Fig.5 : Alternative way to determinethe free height
Fig.4 : Filling degree f in function of freeheight h above grinding media charge
0,75
0,70
0,65
0,60
h =Di + d
2 + h'