ball mill checking [compatibility mode]
TRANSCRIPT
Slegten grinding course 1
Mill check up“In the name of Allah, the Beneficent, the Merciful”
Slegten grinding course 2
Preparation of the visit1. mill must be running steadily (4h)
2. mill must be crash stopped
3. ask for the coarsest cement to be produced(generally highest mill output)
Equipment to foreseeCircuit : thermometer / anemometer
plastic bags
Cpt 1 : buckets of 5 to 10 L / scoop / light
Cpt 2 : buckets of 1 L / plastic bags / sieve, scoop
Mill check up
Slegten grinding course 3
Check up Procedure
1. Technical data sheet
2. 2 to 3 hours survey when mill steady
3. Parameters are collected every hour
4. Samples are collected every hour and before crash stop. The installation is visited at work.
5. Mill must be crash stopped
6. Both compartments are visited and examined
7. Samples are collected in the mill
8. Separator visit
Mill check up
Slegten grinding course 4
Survey before crash stop
Technical Data Sheet
Flow sheet
Ball charge history
Dailyproduction time
Sheet history
Auxiliary capacities
Control systems (if any)
Slegten grinding course 5
C P J 3 5 C P J 4 5
C IR C U IT F E E D IN GO u tp u t ( d u rin g th e v is i t ) 3 0 tp hA v era g e in J u n e ( 2 8 .9 tp h ) ( 2 7 .0 9 tp h ) % H 2 0 T °CC lin k e r a m b ie n t 6 1 % 7 7 %G yp su m 2 .5 % a m b ie n t 6 % 6 %L im es to n e 3 .5 % a m b ie n t 3 3 % 1 7 %
F IN IS H P R O D U C TF in e n e ss ( ta rg e t) 2 0 - 2 4 % R 4 0 µ 1 5 - 2 0 % R 4 0 µ
A B S O R B E D P O W E RM o to r a m p s(A b so rb ed p o w e r)
6 0 A m p( 7 1 0 k W )
6 0 A m p( 7 1 0 k W )
S p ec ific p o w er 2 3 .6 k W h /t(2 4 .5 k W h /t) (2 6 .2 k W h /t)
S E P A R A T O RT y p eF res h a ir d a m p e r 5 0 % o p en 5 0 % o p e nA ir f lo w 3 6 0 0 0 m 3 /h 3 6 0 0 0 m 3 /hA ir r ec irc u la t io n d am p e r 1 0 0 % o p e n 1 0 0 % o p e nR e je c t o u tp u tC a g e sp e ed (1 0 -4 0 rp m ) 2 0 rp m 2 4 rp m
M IL LD E D U S T I N GA c tu a l a ir f lo w 2 5 0 0 0 m 3 /h 2 5 0 0 0 m 3 /hD a m p er p o s i t io n 1 0 0 % 1 0 0 %D e p re ss io n a t m il l in le tD e p re ss io n a t m il l o u t le t
M IS C E L L A N E O U SE a r yes ye sW a te r in je c tio n n o n oG rin d in g a id yes ye sC 3 S -C 2 S -C 3 A -C 4 A F 6 0 -1 3 -1 0 -1 0 6 0 -1 3 -1 0 -1 0
Survey before crash stop
Main parameters
Slegten grinding course 6
09 mm 10 mm1
2
3 4
Sampling : separator & filter
5 67
Survey before crash stop
Slegten grinding course 7
Internal Visit of the MillSampling in the mill
To excavate !
3x on the width
4x on the length Cpt 1
6x on the length Cpt 2
Slegten grinding course 8
Collecting ofsamples
Internal Visit of the Mill
Slegten grinding course 9
Grinding ballscharacteristics
Internal Visit of the Mill
Slegten grinding course 10
Fillingdegree
Internal Visit of the Mill
Slegten grinding course 11
A H1
ST
H
ST = p x D2/4 m2
H1 = H - D/2 m
A = 2ARCOS(2 x H1/D) °
S1 = D2/8 x (p x A/180° - sinA)
R = S1/ST x 100
m2
%S1
Fillingdegree
Internal Visit of the Mill
Slegten grinding course 12
Measured filling degree
Filling degree (%) / H/D
0.55
0.6
0.65
0.7
0.75
0.8
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Remplissage (%)
H/D
DH
Slegten grinding course 13
Grates slots sizecheck up
Internal Visit of the Mill
Slegten grinding course 14
Cpt. length andliner thickness
Internal Visit of the Mill
Slegten grinding course 15
Discovery of ungroundparticles &
untightened grates
Internal Visit of the Mill
Slegten grinding course 16
Material level andfilling degree in 2nd cpt.
Internal Visit of the Mill
Slegten grinding course 17
Other variousmeasurements
Internal Visit of the Mill
Slegten grinding course 18
• Space between blades and external casing• Fan general condition• Seals and valves general condition• Holes in distribution plate• Coating• Wear follow up.
Separator Inspection
Slegten grinding course 19
Separator Inspection
Slegten grinding course 20
Theoretical curves
CUMULATIVE PERCENT RETAINED
0
5
10
15
20
25
30
35
1 2 3 4 5 6 7 8 9 10
1/2"
1/4"
8 M
16 M
30 M
50 M
100 M
200 M
Slegten grinding course 21
0,0%
5,0%
10,0%
15,0%
20,0%
25,0%
30,0%
35,0%
40,0%
45,0%
50,0%
55,0%
60,0%
65,0%
70,0%
75,0%
80,0%
85,0%
1 2 3 4 5 6 7 8 9 10 11
Position in Mill
% R
etai
ned
1/2#4#8#16#30#50#100#200
Part
ition
3.66 m x 10.97 m 2162 kW
Conclusions from findings
Slegten grinding course 22
0,0%
5,0%
10,0%
15,0%
20,0%
25,0%
30,0%
35,0%
40,0%
45,0%
50,0%
55,0%
60,0%
65,0%
70,0%
75,0%
80,0%
1 2 3 4 5 6 7 8 9 10 11
Position in Mill
% R
etai
ned
1/2#4#8#16#30#50#100#200
Part
ition
3.66 m x 10.97 m 2162 kW
Conclusions from findings
Slegten grinding course 23
0,0%
5,0%
10,0%
15,0%
20,0%
25,0%
30,0%
35,0%
40,0%
45,0%
50,0%
55,0%
60,0%
65,0%
C1-1 C1-2 C1-3 C2-1 C2-2 C2-3 C2-4 C2-5 C2-6 C2-7 C2-8 C2-9 C2-10
Position in Mill
Perc
ent R
etai
ned
1/2"1/4"#8#16#30
#50#100#200
Part
ition
5.18 m x 10.36 m 4100 kWConclusions from findings
Slegten grinding course 24
CUMULATIVE OVERSIZE DISTRIBUTION (%)
05
1015202530354045505560657075
CH1/1 CH1/2 CH1/3 CH1/4 CH2/1 CH2/2 CH2/3 CH2/4 CH2/5 CH2/6
102.361.180.60.30.090.044
Conclusions from findings
Slegten grinding course 25
Granulometric curves
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
1/1 2/1 3/1 4/1 5/1 1/2 2/2 3/2 4/2 5/2 6/2 7/2 8/2
% c
umul
ativ
e re
sidu
e
18 mm
11,2 mm
8 mm
4 mm
2,8 mm
1 mm
0,5 mm
0,25 mm
0,15 mm
0,1 mm
Conclusions from findings
Slegten grinding course 26
1 10 100 1000
1
99
98
979695
90
85
80
70
60
50
40
30
20
15
10
5
32
4
characteristics
d75..............: 78.90 µ
d50..............: 60.58 µ
d25..............: 46.52 µ
Imperfection.....: 26.73 %
dl...............: 10.00 µ
#N/A
Conclusions from findings
Slegten grinding course 27
99.9
99
95
90
80
7063.2
50
40
30
20
15
10
54
3
2
1
0.50.1 1 10 100 1000
dimension µ
0.1
1
5
10
20
30
36.8
50
60
7080
85
90
95
9697
98
99
99.5
Filter
Rejects
Separatorfeeding
finishProduct
Fines
Conclusions from findings
Slegten grinding course 28
Granulometric curves
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
1/1 2/1 3/1 4/1 5/1 1/2 2/2 3/2 4/2 5/2 6/2 7/2 8/2
% c
umul
ativ
e re
sidu
e
18 mm
11,2 mm
8 mm
4 mm
2,8 mm
1 mm
0,5 mm
0,25 mm
0,15 mm
0,1 mm
Conclusions from findings
Slegten grinding course 29
A H1
ST
H
ST = p x D2/4 m2
H1 = H - D/2 m
A = 2ARCOS(2 x H1/D) °
S1 = D2/8 x (p x A/180° - sinA)
R = S1/ST x 100
m2
%S1
Filling degree
Slegten grinding course 30
PLANT : OBOURG SAMPLE : cementSEPARATOR : SD150 DATE : 24/03/1994
dim. feed fines rejects efficiency dim effic. (i) trompµ % P % P % P % µ % %
2 5.92 12.93 3.03 77.83 1 63.77 29.744 10.26 22.95 4.78 79.71 3 72.2 24.048 15.87 36.26 6.13 81.41 6 84.58 15.43
16 23.67 55.23 7.69 83.15 12 87.12 12.9720 27.32 63.23 8.72 82.47 18 82.5 18.7925 32.33 72.6 11.03 80.02 22.5 71.44 30.8730 37.73 80.74 14.64 76.25 27.5 59.74 44.4245 55.39 95.67 33.21 61.55 37.5 21.27 69.2160 70.56 99.99 52.25 50.49 52.5 7.49 88.8375 81.55 100 66.6 43.7 67.5 0.01 99.9880 84.25 100 70.13 42.3 77.5 10090 88.65 100 76.37 40.2 85 100
120 94.83 100 85.95 37.57 105 100200 96.6 100 94.51 36.89 160 100210 96.6 100 95.01 36.89 205 100
Blaine : 1324 cm2/gr 3778 cm2/gr 715 cm2/gr
Circulating load : 2,81 correlation : 0,9681 vf : 0,356 vg : 0,644
Conclusions from findings
Slegten grinding course 31
1
10
100
1 10 100 1000
µ
trom
p %
Characteristics
d75...........: 36,32 µd50...........: 26,45 µd25............: 19,26 µ
Imperfection : 32,25 %dl................: 14,41 µby-pass....: 11,28 %
d75d50
d25
dl
by-p
ass
Conclusions from findings
Slegten grinding course 32
PLANT : OBOURG Mill : 3 diam. 5,2mDate : 25/03/1994
% passingsep. inlet Fines sep. sep. rejects Filter blaus. finish product
Sieve (µ)0.7 1.90 4.46 0.901.4 4.69 10.03 2.482 5.92 12.93 3.03
3.2 8.62 19.19 4.194 10.26 22.95 4.788 15.87 36.26 6.1312 20.06 46.56 7.0018 25.39 59.15 8.0630 37.73 80.74 14.6445 55.39 95.67 33.2156 66.86 99.13 47.7570 78.47 100.00 62.7990 88.65 100.00 76.37110 93.76 100.00 83.64135 96.08 100.00 88.80165 96.60 100.00 92.27210 96.60 100.00 95.01260 96.60 100.00 96.20
Blaine 1199 cm2/gr 2841 cm2/gr 1324 cm2/gr 3216 cm2/gr 3187 cm2/gr
Conclusions from findings
Slegten grinding course 33
0.10
1.00
10.00
100.00
0.1 1 10 100 1000 10000
dimension µ
Pass
ing
%
sep. inletFines sep.sep. rejects
Conclusions from findings