MCTools Basic II
Transcript of MCTools Basic II
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CURSO DE OPTIMIZACION DEMOLIENDA DE MINERALES CON
APLICACIONES MOLY-COP TOOLS
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Modelacin Matemtica
Durante los ltimos aos se han desplegado grandes esfuerzos en la
formulacin de relaciones empricas y semiempricas que permitan
describir ambas operaciones independientemente, logrando obtener
niveles de precisin y de detalle satisfactorios para una gran variedad
de aplicaciones, entre las que pueden destacarse las siguientes:
Evaluacin de configuraciones alternativas de molienda
Dimensionamiento ptimo de circuitos de molienda clasificacin
Utilizacin de tcnicas de simulacin matemtica para el
desarrollo de estrategias de control computarizado
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Modelacin Matemtica
Durante la ltima dcada, distintos grupos de investigadores han venido
desplegando grandes esfuerzos tendientes a la formulacin y verificacin
emprica de relaciones matemticas semitericas que caractericen los
diversos mecanismos de fractura operativos en molinos de bolas y otros
equipos afines. A la fecha, diversos investigadores coinciden en que la relacin
controlante del proceso de fracturacin, en un instante de tiempo dado, es del
tipo:
fSjb+fiS-=Ed
dfj
E
ijEi
i
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Un buen MODELO es una representacin simplificada
de la REALIDADobservada, pero que incorpora susaspectos ms relevantes para la INVESTIGACIONparticular en desarrollo.
Un buen MODELO es una representacin simplificada
de la REALIDADobservada, pero que incorpora susaspectos ms relevantes para la INVESTIGACIONparticular en desarrollo.
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Modelamiento
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(1-S1EDE) f1
S1EDE f1
b21S1EDE f1
bi1S1EDE f1
bn1S1EDE f1
(1-S2EDE) f2
S2EDE f2
bi2S2EDE f2
bn2S2EDE f2
t = t
E = E
f1
f2
fi
fn
2
3
i + 1
n + 1
t = t + Dt
E = E + DE
2
3
i + 1
n + 1
Caracterizacin Cintica de la Molienda
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Laboratorio de Molienda de Minerales
Moly-cop Adesur S.A
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Ensayos de Molienda con Monotamaos
Mill Diameter 8" Mineral 1983 gr
Charge Level 45% Size 10 x 14 #
Mill Speed 70% % Solids 65%Net Power 0.047 KW
Mesh Opening,
microns 0 0.5 1 2 4 8
10 1700 100.00 100.00 100.00 100.00 100.00 100.00
14 1180 5.85 22.52 33.86 54.89 78.24 94.55
20 850 0.18 7.74 14.86 28.04 52.25 81.79
28 600 0.12 4.74 9.61 18.26 37.55 68.15
35 425 0.10 3.21 6.70 12.64 27.44 53.82
48 300 2.31 4.92 9.25 20.51 41.33
65 212 1.85 3.92 7.37 16.54 33.87100 150 1.53 3.23 6.16 13.83 28.33
150 105 1.29 2.72 5.27 11.65 23.67
200 74 1.07 2.22 4.42 9.62 19.46
270 53 0.92 1.91 3.88 8.29 16.76
400 37 0.84 1.69 3.48 7.21 14.68
Size Distributions (% Passing)
Grinding Time, min
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Ensayos con Monotamaos
Funcin seleccin
1
10
100
0 2 4 6 8Grinding Time, min
%+1.
Fraction 10x14 #
-S1 = - 0.356 min-1-S1 = - 0.356 min-1
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Mill Diameter 8" Mineral 1983 gr
Charge Level 45% Size 10 x 14 #
Mill Speed 70% % Solids 65%Net Power 0.047 KW
Mesh Opening,
microns 0 0.5 1 2 4 8
10 1700 100.00 100.00 100.00 100.00 100.00 100.00
14 1180 5.85 22.52 33.86 54.89 78.24 94.55
20 850 0.18 7.74 14.86 28.04 52.25 81.79
28 600 0.12 4.74 9.61 18.26 37.55 68.15
35 425 0.10 3.21 6.70 12.64 27.44 53.82
48 300 2.31 4.92 9.25 20.51 41.3365 212 1.85 3.92 7.37 16.54 33.87
100 150 1.53 3.23 6.16 13.83 28.33
150 105 1.29 2.72 5.27 11.65 23.67
200 74 1.07 2.22 4.42 9.62 19.46
270 53 0.92 1.91 3.88 8.29 16.76
400 37 0.84 1.69 3.48 7.21 14.68
Size Distributions (% Passing)
Grinding Time, min
E = P t / H
0.00 0.20 0.40 0.79 1.58 3.16
EnsayosconMonotamaos
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1
10
100
0 0.5 1 1.5 2 2.5 3 3.5Specif ic Energy, kW h/ton
%+1
Fraction 10x14 #
-S1E = - 0.902 ton/kWh-S1E = - 0.902 ton/kWh
Ensayos con Monotamaos
Funcin seleccin
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1
10
100
0 1 2 3 4 5 6 7Grinding Time, min
%+1
101530
MillMill
Ensayos con Monotamaos
Ref. : M. Siddique (Univ. of Utah)
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1
10
100
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2Specif ic Energy, kW h/ton
%+1
101530
Mill Mill
Ensayos con Monotamaos
Ref. : M. Siddique (Univ. of Utah)
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1
10
100
0 2 4 6 8Grinding Time, m in
%+1
5 /60/30 10 /60/3020 /60/30 5 /50/4010 /50/40 20 /50/40 5 /70/50 10 /70/5020 /70/50
Mill / Mill Speed / % Filling Mill / Mill Speed / % Filling
Ensayos con Monotamaos
Ref. : Dr. S. Malgham (Univ. of Berkeley)
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1
10
100
0 0.5 1 1.5 2 2.5Specific Energy, kWh/ton
%+1
5 /60/30 10 /60/3020 /60/30 5 /50/4010 /50/40 20 /50/40 5 /70/50 10 /70/5020 /70/50
Mill / Mill Speed / % Filling Mill / Mill Speed / % Filling
Ensayos con Monotamaos
Ref. : Dr. S. Malgham (Univ. of Berkeley)
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0.1
1.0
100 1000 10000Particle Size, m
S,tokWh.
28 x 35 #
14 x 20 #
8 x 10 #
4 x 6 #
Ensayos con Monotamaos
Funcin seleccin Especifica
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FuncionSeleccionEspecifica,ton/kWh
0.001
0.01
0.1
1
10
1 10 100 1000 10000 100000Particle Size, m
SeoFotokWh
.
SiE = 0 (di)1 / [ 1 + (di/dcrit)2]SiE = 0 (di)1 / [ 1 + (di/dcrit)2]
0
1
dcrit
2 - 1)
Velocidad Fraccional de Fractura.Fraccin de las partculas de tamao i, presentes en la carga del molino, que
resultarn fracturadas en la siguiente unidad de tiempo.
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FuncinFractura
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02468
101214161820
0.0 0.2 0. 4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2Grinding Time, min
%Pn.
20 # 35 #65 # 270 #
Bi1 S1
Ensayos con Monotamaos
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1
10
100
10 100 1000 10000Particle Size, microns
B1
Fraction 10x14 #
Ensayos con Monotamaos
Funcion Fractura Acumulada, Bij
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1
10
100
10 100 1000 10000Part icle Size, microns
B
Fraction 10x14 #Fraction 14x20 #Fraction 20x28 #
Ensayos con Monotamaos
Funcion Fractura Acumulada, Bij
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1
10
100
0.01 0.1 1Relative Particle Size, d i/ dj+1
B
Fraction 10x14 #Fraction 14x20 #Fraction 20x28 #
Bij = b0 (di /dj+1)b1 + (1 - b0) (di/dj+1)b2]ij = b0 (di /dj+1)b1 + (1 - b0) (di/dj+1)b2]
b0 b1
Ensayos con Monotamaos
Funcion Fractura Acumulada, Bij
GranulometradelosFragmentosPrimarios.Fraccin,enpeso,delosfragmentosresultantesdelafracturadepartculasdetamaooriginalj,quereportanalafracciniinferior.
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0.1
1.0
100 1000 10000Particle Size, m
S,tokWh.
3.0 String2.5 String2.0 String
Efecto dela cargadebolas
28 x 35 #
14 x 20 #
8 x 10 #4 x 6 #
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Moly-Cop Tools TM Sample N 1
Remarks : Balance GoldFields Noviembre 08
Eff. Diameter, ft 19.5 Mill Power, KW (Gross) 6770
Eff. Length, ft 34.0 Mill Power, KW (Net) 6093
Speed, % Critical 72.0 Throughput, ton/hr 2070.2
App. Density, ton/m3 5.32 % Solids (by weight) 69.6
Charge Level, % 34.0 Sp. Energy, KWH/ton 3.27
Balls Filling, % 34.0 Reduction Ratio 1.39Lift Angle, () 32.6
Mill Mill
Mesh Opening Mid-Size Feed Discharge
1.05 25400 21997 100.00 100.00
0.742 19050 15554 100.00 100.000.525 12700 8980 100.00 100.00
0.25 6350 5492 97.52 99.32
4 4750 3989 97.13 99.53
6 3350 2812 96.65 99.62
8 2360 2173 95.87 99.74
10 2000 1682 94.81 99.41
14 1414 1090 92.90 99.35
20 841 707 88.30 98.94
30 595 503 78.88 91.4740 425 388 63.80 78.21
45 354 297 53.66 69.00
60 250 194 37.97 54.35
100 150 126 23.92 39.25
140 106 89 19.72 32.52
200 75 63 16.93 27.19
270 53 48 14.77 23.15
325 44 41 13.94 21.59
400 38 19 13.15 20.01
D80, microns 621 446
Size Distributions
BALL MILL PERFORMANCE
BALLBALGrinding Circuit Mass Balance Estimator
InformacinparaajusteDeparmetrosdemolienda
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Planilla BallParam_Open ... (Data_File)Moly-Cop Tools TM
Remarks Test N 1
Mill Dimensions and Operating Conditions 7971 Balls
Diameter Length Speed Charge Balls Lift 0 Overfilling
ft ft % Critical Filling,% Filling,% Angle, () 1566 Slurry
24.0 36.0 71.5 30.00 30.00 29.1 9536 Net Power
rpm 11.18 10.0 % Losses
10596 Gross kW
% Solids (by weight) 78.6 Charge Apparent Mill Flowrate, tph (dry) 2518.0
Ore Density, ton/m3 3.51 Volume, Ball Density
Slurry Density, ton/m3 2.28 m3 Charge Interstitial Excess ton/m3 Total Energy, kWh/ton 3.79
Balls Density, ton/m3 7.75 138.62 644.60 126.62 0.00 5.563 Balls Energy, kWh/ton 3.17
% wi wiABS(error)
i Mesh Opening Mid-Size % Ret % Pass % Ret % Pass % Ret % Pass Exp Adj. Error
1 1" 25400 100.00 100.00 100.00
2 3/4" 19050 21997 0.39 99.61 0.01 99.99 0.02 99.98 0.07 0.23 0.00 3 0.00
3 1/2" 12700 15554 1.90 97.70 0.00 99.98 0.08 99.89 0.40 0.46 0.00 4 0.00
4 3/8" 9500 10984 1.85 95.85 0.05 99.93 0.12 99.77 0.78 0.85 0.00 5 0.00
5 1/4" 6700 7978 2.75 93.10 0.33 99.60 0.24 99.54 1.51 1.51 (0.00) 5 0.00
6 4 4750 5641 2.41 90.69 0.38 99.22 0.39 99.15 2.56 2.54 0.88 5 4.40
7 6 3350 3989 3.20 87.49 0.74 98.48 0.68 98.47 4.16 4.16 (0.00) 5 0.01
8 8 2360 2812 3.72 83.77 1.06 97.42 1.12 97.35 6.38 6.73 (5.13) 5 25.63
9 10 1700 2003 4.56 79.21 1.65 95.77 1.74 95.61 9.71 10.32 (5.95) 5 29.76
10 14 1180 1416 5.70 73.52 2.55 93.22 2.80 92.81 14.70 15.49 (5.15) 5 25.77
11 20 850 1001 6.72 66.80 3.71 89.51 3.99 88.82 22.95 22.78 0.74 5 3.7012 28 600 714 8.44 58.36 5.73 83.78 5.85 82.97 31.55 31.27 0.91 5 4.53
13 35 425 505 11.24 47.12 9.32 74.47 8.41 74.57 39.49 39.31 0.46 5 2.32
14 48 300 357 10.62 36.49 10.25 64.22 10.22 64.34 46.93 46.07 1.88 5 9.38
15 65 212 252 9.18 27.32 10.49 53.73 10.84 53.50 49.98 49.19 1.60 5 8.02
16 100 150 178 8.27 19.04 11.15 42.58 10.74 42.76 47.69 47.77 (0.18) 5 0.90
17 150 106 126 5.60 13.44 8.78 33.80 8.97 33.79 42.23 42.58 (0.82) 5 4.09
18 200 75 89 3.91 9.53 7.03 26.78 6.99 26.79 35.03 34.24 2.30 5 11.52
19 270 53 63 2.42 7.11 4.79 21.99 5.03 21.77 42.58 42.76 (0.41) 5 2.03
20 325 44 48 1.33 5.78 3.29 18.70 2.51 19.26 33.80 33.79 0.06 4 0.22
21 -325 0 22 5.78 0.00 18.70 0.00 19.26 0.00 26.78 26.79 (0.06) 3 0.19
sum 94.00 132.46
Mill Feed Mill Disch. (exp) Mill Disch. (adj)
Mill Charge Weight, tons
Slurry
Interstitial
Slurry Filling,%
100.00
BALLPARAM_OPEN : Estimation of Grinding Parameters from Plant Scale Data
%Ret. (smoothed)
Objective Function
Base Case Example
Feed Size Distributions
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Planilla BallParam_Open ... (Control_Panel)
Moly-Cop Tools TM
Test N 1
SELECTION FUNCTION :
alpha0 0.005000
alpha1 0.650
alpha2 2.5 Dcrit 5000
Expanded Form
alpha02 0.0000000
alpha12 1.000
BREAKAGE FUNCTION :
beta0 0.40000
beta1 0.650
beta2 4.0
Expanded Form
beta01 0.000
Objective Function 22.06
BALLPARAM_OPEN: Estimation of Grinding Parameters from Plant Scale Data
Note: Current calculations are not valid, if SOLVER has not been run after the last data modification.
1
10
100
10 100 1000 10000 100000
Particle Size, microns
%P
assing
Feed
Discharge (Exp.)Discharge (Adjusted)SiE * 10
Moly-Cop Tools TM
Test N 1
SELECTION FUNCTION :
alpha0 0.005000
alpha1 0.650
alpha2 2.5 Dcrit 5000
Expanded Form
alpha02 0.0000000
alpha12 1.000
BREAKAGE FUNCTION :
beta0 0.40000
beta1 0.650
beta2 4.0
Expanded Form
beta01 0.000
Objective Function 22.06
BALLPARAM_OPEN: Estimation of Grinding Parameters from Plant Scale Data
Note: Current calculations are not valid, if SOLVER has not been run after the last data modification.
1
10
100
10 100 1000 10000 100000
Particle Size, microns
%P
assing
Feed
Discharge (Exp.)Discharge (Adjusted)SiE * 10
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Planilla BallParam_Open ... (Control_Panel)
Moly-Cop Tools TM
Test N 1
SELECTION FUNCTION :
alpha0 0.009686
alpha1 0.659 alpha2 2.5
Dcrit 7093
Expanded Form
alpha02 0.0000000
alpha12 1.000
BREAKAGE FUNCTION :
beta0 0.40000
beta1 0.650
beta2 4.0
Expanded Form
beta01 0.000
Objective Function 0.94
BALLPARAM_OPEN: Estimation of Grinding Parameters from Plant Scale Data
Note: Current calculations are not valid, if SOLVER has not been run after the last data modification.
1
10
100
10 100 1000 10000 100000
Particle Size, microns
%P
assing
FeedDischarge (Exp.)Discharge (Adjusted)SiE * 10
Moly-Cop Tools TM
Test N 1
SELECTION FUNCTION :
alpha0 0.009686
alpha1 0.659 alpha2 2.5
Dcrit 7093
Expanded Form
alpha02 0.0000000
alpha12 1.000
BREAKAGE FUNCTION :
beta0 0.40000
beta1 0.650
beta2 4.0
Expanded Form
beta01 0.000
Objective Function 0.94
BALLPARAM_OPEN: Estimation of Grinding Parameters from Plant Scale Data
Note: Current calculations are not valid, if SOLVER has not been run after the last data modification.
1
10
100
10 100 1000 10000 100000
Particle Size, microns
%P
assing
FeedDischarge (Exp.)Discharge (Adjusted)SiE * 10
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Ajuste de parametros de
Moliendabilidad del Mineral
Deben de ser lo
mas parecidos
posibles para
considerar que
hay un buenajuste
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E l i t L b t i / l t
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0.1
1
10 100 1000 10000Particle Size, m
SeoF
otokWh
.
Laboratory : 18 x 15 Industrial : 16.5 x 24 Laboratory : 18 x 15 Industrial : 16.5 x 24
Escalamiento Laboratorio / planta
Efecto del area superficial de la carga
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406080
100120140160180200
20 40 60 80 100 120 140Specific Charge Area, m2 /m3
toh
5.0 mm9.8 mm16.0 mm20.0 mm
F80 Feed OreEl tamao Optimo de bola (Area de la
carga) depende fundamentalmente del
Tamao de alimentacion del mineral.
Efecto del area superficial de la carga
Carga Ideal en funcin del tamao de Alimentacin
Moly-Cop Tools TM
BALLSIM : Conventional Closed Circuit Grinding Simulator
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Circuit Type REVERSE (see Flowsheet) Simulation N 0
Remarks
Mill Dimensions and Operating Conditions 3348 Balls
Diameter Length Speed Charge Balls App. Dens. Interstitial Lift 0 Overfillingft ft % Critical Filling,% Filling,% ton/m3 Slurry, % Angle, () 536 Slurry
18.5 22.0 72.0 38.0 38.0 5.39 100.0 35.0 3885 Net kW
rpm 12.82 10.0 % Losses
4316 Gross kW
Cyclone Dimensions (inches) and Operating Conditions
Number Diameter Height Inlet Vortex Apex
10 20.0 75.0 3.50 7.50 4.05
% Solids O'flow 40.0
% Solids U'flow 76.0 Bond's
% Solids Mill Discharge 72.0 Feedrate
P80 160.2 for a
Circulating Load 3.849 (Guess) Wio 15.66 Target P80
3.849 (Actual) % Fines MD 20.04
0.000 (Delta) Q 1779 Target P80Bpf 0.425 170.0
Ore Density, ton/m3 2.80 Cycl. Psi 9.4 ton/hr
Balls Density, ton/m3 7.75 Sump Water 466.4 413.8
Feedrate, ton/hr (dry) 400.0
Feed Moisture, % 5.0
i Mesh Opening Mid-Size ton/hr % Retained % Passing
1 1.05 25400 100.00
2 0.742 19050 21997 0.00 0.00 100.00
3 0.525 12700 15554 20.00 5.00 95.00
4 0.371 9500 10984 66.40 16.60 78.40
5 3 6700 7978 56.28 14.07 64.336 4 4750 5641 41.32 10.33 54.00
7 6 3350 3989 33.36 8.34 45.66
8 8 2360 2812 27.36 6.84 38.82
9 10 1700 2003 21.64 5.41 33.41
10 14 1180 1416 20.40 5.10 28.31
11 20 850 1001 15.60 3.90 24.41
12 28 600 714 14.16 3.54 20.87
13 35 425 505 12.04 3.01 17.86
14 48 300 357 10.36 2.59 15.27
15 65 212 252 8.84 2.21 13.06
16 100 150 178 7.52 1.88 11.18
17 150 106 126 6.48 1.62 9.56
18 200 75 89 5.52 1.38 8.18
19 270 53 63 4.72 1.18 7.00
20 400 38 45 3.40 0.85 6.15
21 -400 0 19 24.60 6.15 0.00
Selection Function Parameters : Expanded Form :
alpha0 alpha1 alpha2 dcrit alpha02 alpha12
0.00918 0.65 2.5 6532 0 1
0 1 Suggested Default Values
Breakage Function Parameters : Expanded Form :
beta0 beta1 beta2 beta01
0.2 0.25 4 0
0 Suggested Default Value
Classifier Constants :
a1 a2 a3 a4
9.680 1.401 54.964 0.523 0.950
9.680 1.401 54.964 0.523 0.950 Suggested Default Values
Feed Size Distribution
BALLSIM : Conventional Closed Circuit Grinding Simulator
Base Case Example
Main Simulated Outputs
Iterate
Very Important :
Simulation results are not valid until
the Iteratebutton has been clicked
after any input data changes.
Simulaciones de
Inters
Valores provienen
del balance de
materiales
Provienen de la hoja de
estimacion de
parametros
Alimentacion Fresca
al Circuito
Informacion del
Molino y clasificador
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Planilla (Flowsheet)
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Planilla BallSim_Direct ... (Flowsheet)
Moly-Cop Tools TMSimulation N 0
Remarks
40.10 % Solids
54.76 % - Size 18
psi 7.65 169.4 P80
# of Cyclones 6
Vortex 9.10 Circ. Load 2.77
Apex 4.51 0.349 Bpf m
3
/hr 18840.375 Bpw
% Solids 75.60
Water,
m3/hr 464.4
ton/hr 504.0 Water, 262.0
F80 6913 m
3
/hr
Gross kW 4316.1
kWh/ton 8.56 % Balls 38.00
Wio 13.21 % Critical 72.00
% Solids 72.00
% Solids 61.24
Simulacin Molino 2.
Moly-Cop Tools TMSimulation N 0
Remarks
40.10 % Solids
54.76 % - Size 18
psi 7.65 169.4 P80
# of Cyclones 6
Vortex 9.10 Circ. Load 2.77
Apex 4.51 0.349 Bpf m
3
/hr 18840.375 Bpw
% Solids 75.60
Water,
m3/hr 464.4
ton/hr 504.0 Water, 262.0
F80 6913 m
3
/hr
Gross kW 4316.1
kWh/ton 8.56 % Balls 38.00
Wio 13.21 % Critical 72.00
% Solids 72.00
% Solids 61.24
Simulacin Molino 2.
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Calidad del AjusteComparacin de valores medidos vs simulados
Saturnino
Variable Variable DesviacinMedida Simulada %TRATAMIENTO ton/hr 504.0 504.0 0.0Circulante, % 278.0 277.0 (0.4)F80 6,913 6,913 0.0P80 168.1 169.4 0.8ENERGA % Llenado 38 38 0.0kW (net) 3,885 3,885 0.0kWh/ton (bruta) 8.56 8.56 0.0Wio 13.16 13.21 0.4CLASIFICADORES Presin, psi 8.0 7.7 (3.8)By-Pass Finos, % 34.9 34.9 0.0By-Pass Agua, % 37.5 37.5 0.0
Variable Variable DesviacinMedida Simulada %TRATAMIENTO ton/hr 504.0 504.0 0.0Circulante, % 278.0 277.0 (0.4)F80 6,913 6,913 0.0P80 168.1 169.4 0.8ENERGA % Llenado 38 38 0.0kW (net) 3,885 3,885 0.0kWh/ton (bruta) 8.56 8.56 0.0Wio 13.16 13.21 0.4CLASIFICADORES Presin, psi 8.0 7.7 (3.8)By-Pass Finos, % 34.9 34.9 0.0By-Pass Agua, % 37.5 37.5 0.0
Ahora ya tengo un simuladorsintonizado a la realidad demi proceso y por lo tanto, mepuedo apoyar en ste para
proyectar nuevas y mejorescondiciones operacionales ...
Algunos das despus
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Algunosdasdespus...
Ya, Don Eme ...ahora tenemos un simuladorsintonizado a nuestro procesoy podemos explorar elpotencial de nuevasoptimizaciones siguiendo lasenseanzas de los 10
Mandamientos del Dr.Seplveda.Por favor, no te demores ...La ansiedad me agobia !Calma ...Por ejemplo :
Emeterio Saturnino
Mandamiento 6
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Maximizar el contenido de Solidos en el Underflow
Sim. # Sim. # Sim. # Sim. #0 1 2 3
TRATAMIENTO ton/hr 504.0 508.7 509.5 515.3
Circulante, % 277.0 278.0 248.0 254.0P80 169.4 169.4 169.4 169.4
ENERGA kW (net) 3,885 3,885 3,885 3,885kWh/ton (bruta) 8.56 8.48 8.47 8.38Wio 13.21 13.09 13.07 12.93
CLASIFICADORES # de Ciclones 6.0 5.0 5.0 4.0% Sl. Rebalse 40.1 40.1 40.1 40.1
% Sl. Descarga 75.6 77.0 78.5 80.0Presin, psi 7.7 9.8 9.1 12.5By-Pass Finos, % 34.9 33.2 29.1 27.8By-Pass Agua, % 37.5 35.7 31.2 29.9
Sim. # Sim. # Sim. # Sim. #0 1 2 3
TRATAMIENTO ton/hr 504.0 508.7 509.5 515.3
Circulante, % 277.0 278.0 248.0 254.0P80 169.4 169.4 169.4 169.4
ENERGA kW (net) 3,885 3,885 3,885 3,885kWh/ton (bruta) 8.56 8.48 8.47 8.38Wio 13.21 13.09 13.07 12.93
CLASIFICADORES # de Ciclones 6.0 5.0 5.0 4.0% Sl. Rebalse 40.1 40.1 40.1 40.1
% Sl. Descarga 75.6 77.0 78.5 80.0Presin, psi 7.7 9.8 9.1 12.5By-Pass Finos, % 34.9 33.2 29.1 27.8By-Pass Agua, % 37.5 35.7 31.2 29.9
Mandamiento #7AXI I A OSI ICACION AGUA
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MAXIMIZARDOSIFICACIONDEAGUAMandamiento #8INCREMENTARCAPACIDADDELABOMBA
Sim. # Sim. # Sim. # Sim. #4 5 6 7TRATAMIENTO
ton/hr 509.4 524.4 535.3 548.3Circulante, % 257.0 302.0 317.0 367.0P80 169.4 169.4 169.4 169.4
ENERGA kWh/ton (bruta) 8.47 8.23 8.06 7.87Wio 13.08 12.70 12.44 12.15
CLASIFICADORES # de Ciclones 5.0 5.0 6.0 6.0
% Sl. Rebalse 40.1 38.0 36.0 34.0% Sl. Descarga 78.0 78.0 78.0 78.0Alim. Ciclones, m3/hr 1,780 2,055 2,228 2,547Presin, psi 9.3 11.1 9.6 11.4By-Pass Finos, % 30.4 31.9 31.2 32.4By-Pass Agua, % 32.7 34.3 33.5 34.8
Sim. # Sim. # Sim. # Sim. #4 5 6 7TRATAMIENTO
ton/hr 509.4 524.4 535.3 548.3Circulante, % 257.0 302.0 317.0 367.0P80 169.4 169.4 169.4 169.4
ENERGA kWh/ton (bruta) 8.47 8.23 8.06 7.87Wio 13.08 12.70 12.44 12.15
CLASIFICADORES # de Ciclones 5.0 5.0 6.0 6.0
% Sl. Rebalse 40.1 38.0 36.0 34.0% Sl. Descarga 78.0 78.0 78.0 78.0Alim. Ciclones, m3/hr 1,780 2,055 2,228 2,547Presin, psi 9.3 11.1 9.6 11.4By-Pass Finos, % 30.4 31.9 31.2 32.4By-Pass Agua, % 32.7 34.3 33.5 34.8
Algunos meses despus .....
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Satito, nos estnofreciendo otras bolas msbaratas ...
g p
Pero ... Sern igual debuenas, Don Eme?Deberamos hacer un MBWTprimero.
Oooh ... Y qu es eso?
No se preocupe, Don Eme.Con la ayuda de Moly-Cop Tools se loexplico.
Emeterio Saturnino
Mecanismos para medir
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Micro - Wear : Abrasion / Corrosion.
Macro - Wear : Spalling.
Impact Breakage.
p
El consumo de medios de molienda
El Algebra de las Bolas
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t m bd m
d t
k A= =( )( )
Ab
d
La Cinetica Del Desgaste
En cada instante, la prdida depeso del cuerpo moledor esproporcional al rea expuesta :
Equivalente a :d d
d t
k
k
m
b d
( )
( )= =
2
El Algebra de las Bolas
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Ab
d
Por lo tanto, si kd permanececonstante en el tiempo; es decir,no es funcin del dimetroinstantneo de la bola, secumplir la relacin lineal :
d = dR - kd t
TEORIA LINEAL DEL DESGASTE
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Marked Ball Wear Test (MBWT)
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Recovering balls inside the mill
Marked Ball Wear Test (MBWT)
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0102030405060
0 10 20 30 40 50Time, days
BSzem
Type A BallsType B Balls
- kd
d = dR - kd td = dR - kd t
Planilla Media Charge_MBWT ...
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Moly-Cop Tools TM
Remarks
Mill
Power, kW
Mill Dimensions and Operating Conditions 3,348 Balls
Diameter Length Mill Speed Charge Balls Interstitial Lift 0 Rocks
ft ft % Critical Filling,% Filling,% Filling,% Angle, () 536 Slurry18.50 22.00 72.00 38.00 38.00 100.00 35.00 3,885 Net Total
rpm 12.82 10.00 % Losses
4,316 Gross Total
% Solids in the Mill 72.00 Charge Apparent
Ore Density, ton/m3 2.80 Volume, Ball Osize Interstitial Density
Slurry Density, ton/m3 1.86 m3 Charge Rocks Slurry ton/m3
Balls Density, ton/m3 7.75 63.76 296.48 0.00 47.48 5.395
Initial Ball Size, mm 65.0
Final Ball Size, mm 52.0 Free Kidney
Weight Loss, % 48.8 Height Above Angle,
Wear Rate Estimates, Charge, ft Degrees
m/[KWH(balls)/ton(balls)] 1.612 with Grind-out 11.01 158.04
mm/hr 0.01821 without Grind-out 11.01 158.04
TEST DURATION, hrs 714
Practical Guidelines for
Molino 1.
Mill Charge Weight, tons
MARKED BALL WEAR TEST DESIGN
Moly-Cop Tools TM
Remarks
Mill
Power, kW
Mill Dimensions and Operating Conditions 3,348 Balls
Diameter Length Mill Speed Charge Balls Interstitial Lift 0 Rocks
ft ft % Critical Filling,% Filling,% Filling,% Angle, () 536 Slurry18.50 22.00 72.00 38.00 38.00 100.00 35.00 3,885 Net Total
rpm 12.82 10.00 % Losses
4,316 Gross Total
% Solids in the Mill 72.00 Charge Apparent
Ore Density, ton/m3 2.80 Volume, Ball Osize Interstitial Density
Slurry Density, ton/m3 1.86 m3 Charge Rocks Slurry ton/m3
Balls Density, ton/m3 7.75 63.76 296.48 0.00 47.48 5.395
Initial Ball Size, mm 65.0
Final Ball Size, mm 52.0 Free Kidney
Weight Loss, % 48.8 Height Above Angle,
Wear Rate Estimates, Charge, ft Degrees
m/[KWH(balls)/ton(balls)] 1.612 with Grind-out 11.01 158.04
mm/hr 0.01821 without Grind-out 11.01 158.04
TEST DURATION, hrs 714
Practical Guidelines for
Molino 1.
Mill Charge Weight, tons
MARKED BALL WEAR TEST DESIGN
Planilla Media Charge_MBWT ...
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Recovery Available
Rate, Recovery
SAMPLE SIZE, NTOT
(Minimum Number of Marked Balls per Group) m-hours/m2 Hours
0.25 8.0
Option 1. Ball Picking over Exposed Mill Charge Surface
Recovery Recovery Exposed Exposed Marked Balls Sample
Target, Area, Marked Balls, Ball Layers, Concentration, Size,
# Balls m2 # Balls/m2 # # Balls/m3 NTOT
man-hours inspectors
w/ Grind-out 5 37.17 0.13 1.0 2.07 132 9 2
w/o Grind-out 5 37.17 0.13 1.0 2.07 132 9 2
Option 2. Same as Option 1, with one full-turn inching of the mill
Recovery Recovery Exposed Exposed Marked Balls Sample
Target, Area, Marked Balls, Ball Layers, Concentration, Size,
# Balls m2 # Balls/m2 # # Balls/m3 NTOT
man-hours inspectors
w/ Grind-out 5 89.38 0.06 1.0 0.86 55 22 4
w/o Grind-out 5 89.38 0.06 1.0 0.86 55 22 4
Labor
Required
Labor
Required
Recovery Available
Rate, Recovery
SAMPLE SIZE, NTOT
(Minimum Number of Marked Balls per Group) m-hours/m2 Hours
0.25 8.0
Option 1. Ball Picking over Exposed Mill Charge Surface
Recovery Recovery Exposed Exposed Marked Balls Sample
Target, Area, Marked Balls, Ball Layers, Concentration, Size,
# Balls m2 # Balls/m2 # # Balls/m3 NTOT
man-hours inspectors
w/ Grind-out 5 37.17 0.13 1.0 2.07 132 9 2
w/o Grind-out 5 37.17 0.13 1.0 2.07 132 9 2
Option 2. Same as Option 1, with one full-turn inching of the mill
Recovery Recovery Exposed Exposed Marked Balls Sample
Target, Area, Marked Balls, Ball Layers, Concentration, Size,
# Balls m2 # Balls/m2 # # Balls/m3 NTOT
man-hours inspectors
w/ Grind-out 5 89.38 0.06 1.0 0.86 55 22 4
w/o Grind-out 5 89.38 0.06 1.0 0.86 55 22 4
Labor
Required
Labor
Required
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Algunos meses despus ...
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Los resultados del MBWTindican que la diferencia de
calidad de las bolasalternativas es mayor que ladiferencia de precio y ...como que no nos convienecambiar de proveedor ...pero igual me gustara haceruna prueba industrial.
Lamentablemente, tenemosslo un molino, as queestaramos obligados aefectuar una EvaluacinSecuencial y no Concurrente.
Oooh ... Y qu es eso?
No se preocupe, Don Eme.Con la ayuda de Moly-Cop Tools se loexplico.
Emeterio Saturnino
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Rendimientos a Escala Industrial
Indicadores de consumo de bolas
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gr
ton[ ]
gr
kWh[ ] ton[ ]
kWh=
El Indicador de consumo ms tradicional [gr/ton] puede serdescompuesto en 2 factores independientes:Depende de la Abrasividad yCorrosividad del mineral y la
Calidad de las Bolas.
Depende de la dureza del mineral
y la tarea de molienda, segn indica
la Ley de Bond.
ton[ ] 1
P800.5
[ ] ton/hr[ ]kWh
= 10 Wio1
F800.5
_ kW=
donde:
Indicadores de consumo de bolas
Rendimientos a Escala Industrial
Indicadores de consumo de bolas
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Con el propsito de comparar rendimientos en [gr/ton] contra unacondicin referencial, el marco terico existente sugiere definir elindicador [gr/ton] corregido como sigue: cuando dS0)
Mcorr = M (Eref/ E) (dR/ drefR) Por lo tanto, Mcorr es el indicador a ser utilizado paracomparaciones de costo-efectivo.
Indicadores de consumo de bolas
Anlisis de Antecedentes Operacionales
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Secuencial, comparacin de consumoshistricos del mismo molino, antes ydespus de la purga. Simultnea, comparacin de consumos delmolino de prueba contra un molino estndar,
operando en paralelo.
EVALUACIONES COMPARATIVAS
Evaluaciones de Calidad Comparativa
Evaluaciones a escala industrial
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Evaluacin Secuencial: comparacin de losindicadores histricos del mismo molino, antes y
despus del perodo de purga.
[(kdE
2,Post kdE
2,Pre)/kdE
2,Pre] *100
Evaluaciones a escala industrial
Evaluaciones de Calidad Comparativa
Evaluaciones a escala industrial
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Concurrente (Paralela) : comparacin de losindicadores de un molino de prueba contra un
molino estndar, ambos operando en paralelo,
por exactamente el mismo perodo de tiempo,posterior a la purga.
[(kdE2,Post kdE1,Post)/kdE1,Post] *100
Evaluaciones a escala industrial
Referencia Cruzada
Evaluaciones a escala industrial
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Pre vs Post Perodo de Purga: diferencia entre el % devariacin de los indicadores para el mismo molino, antes y
despus del perodo de purga:
[ (kdE
2,Post - kdE
2,Pre)/kdE
2,Pre - (kdE
1,Post kdE
1,Pre)/ kdE
1,Pre] x 100
Molino 2 vs Molino 1: diferencia entre el % de diferencia delos indicadores de ambos molinos, antes y despus del
perodo de purga :
[ (kdE
2,Post kdE
1,Post)/kdE
1,Post - (kdE
2,Pre kdE
1,Pre)/ kdE
1,Pre] x 100
Rendimientos a Escala Industrial
Indicadores de la
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Constante Lineal de Desgaste,kd (mm/hr)
Constante Especfica de Desgaste,kd
E (m/(kWh/ton))
Calidad intrinseca de las bolas
Algunosmesesdespus...
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Don Eme, ya tengo losresultados de la evaluacinSecuencial de las bolasalternativas.
Veamos, veamos ...
Emeterio Saturnino
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Resumen de ResultadosEVALUACION DE CUERPOS MOLEDORES,
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Perodo Perodo Variacin,Pre Purga Post Purga %TRATAMIENTO ton/hr 535.3 549.0 2.6P80 169.4 172.5 1.8ENERGA % Llenado 38 36kW (net) 3,885 3,812 (1.9)kWh/ton 8.06 7.71 (4.3)Wio 12.4 12.0 (3.3)CONS. BOLAS gr/ton 621.2 621.2 0.0kg/hr 332.5 341.0 2.6gr/kWh 77.1 80.5 4.5Constante kdE 1.612 1.763 9.4
Perodo Perodo Variacin,Pre Purga Post Purga %TRATAMIENTO ton/hr 535.3 549.0 2.6P80 169.4 172.5 1.8ENERGA % Llenado 38 36kW (net) 3,885 3,812 (1.9)kWh/ton 8.06 7.71 (4.3)Wio 12.4 12.0 (3.3)CONS. BOLAS gr/ton 621.2 621.2 0.0kg/hr 332.5 341.0 2.6gr/kWh 77.1 80.5 4.5Constante kdE 1.612 1.763 9.4
A ESCALA INDUSTRIAL
Saturnino
A m, no me la hacen
- Le agregaron sobrepeso a las bolas,- Las bolas son de menor densidad ydemandan menos potencia- Como nos dijeron que eran iguales y
mantuviramos igual la recarga, senos vaciaron ligeramente los molinos,- Adems, el mineral estuvoligeramente ms blando,
pero la Constante de Desgaste igual
los delata que son 9.4% peores quenuestras bolas standard.
Ejercicio de Evaluacin de ConsumosDeterminar su KdE
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Application FAIR MINING COMPANY
Unit Ball Mill 22Mill Diam 20 ft Make Up Balls 3,0"Mill Lenght 26 ft % Balls (Nominal) 34% Critical 74 % % Charge (Nominal) 34Ore Density 2.8 ton/m3 % Solids (Nominal) 72
Month Ore Operating Grinding Energy Mill Power
Troughput Hours capacity Consumption KWTon/month hr/month ton/hr Mw/Mth Ton/Month gr/ton Kg/Hr gr/KWh
Jul-02 377,614 632 597 3920 6.20 225.5 597.0 357 57.5 Meatballs
Ago-02 433,034 715 606 3576 5.00 240.1 554.6 336 67.2 Meatballs
Sep-02 422,807 691 612 3686 5.33 271.5 642.1 393 73.6 Meatballs
Oct-02 475,562 688 691 3472 5.05 214.4 450.7 312 61.7 Meatballs
Nov-02 492,972 711 693 3527 4.96 224.0 454.4 315 63.5 Meatballs
Dic-02 350,641 549 639 3612 6.58 274.6 783.2 500 76.0 MeatballsEne-03 438,673 723 607 3238 4.48 219.8 501.1 304 67.9 Meatballs
Feb-03 458,283 661 693 3649 5.52 224.4 489.7 339 61.5 Meatballs
Mar-03 457,987 678 675 3612 5.33 237.0 517.4 350 65.6 Meatballs
Abr-03 488,000 692 705 3649 5.27 284.3 582.6 411 77.9 Meatballs
May-03 428,431 641 668 2996 4.67 232.7 543.0 363 77.7 Meatballs
Jun-03 536,776 700 766 2940 4.20 222.2 413.9 317 75.6 Meatballs
OPERATIONAL RECORDS
Balls Consumption
Supplier
Ejercicio de Evaluacin de ConsumosDeterminar su KdE
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Application FAIR MINING COMPANY
Unit Ball Mill 12Mill Diam 20 ft Make Up Balls 3,0"Mill Lenght 26 ft % Balls (Nominal) 36% Critical 74 % % Charge (Nominal) 36Ore Density 2.8 ton/m3 % Solids (Nominal) 72
Month Ore Operating Grinding Energy Mill Power
Troughput Hours capacity Consumption KWTon/month hr/month ton/hr Mw/Mth Ton/Month gr/ton Kg/Hr gr/KWh
Jul-02 508,771 721 706 3773 5.233 247.2 486 343 65.5 Forge +Ago-02 457,797 644 711 3360 5.217 213.9 467 332 63.7 Forge +Sep-02 454,036 715 635 3706 5.183 253.5 558 355 68.4 Forge +Oct-02 359,114 643 558 3590 5.583 210.8 587 328 58.7 Forge +Nov-02 351,590 627 561 3120 4.976 205.3 584 327 65.8 Forge +Dic-02 426,130 695 613 3686 5.304 257.7 605 371 69.9
Forge +Ene-03 497,918 718 693 3725 5.188 242.0 486 337 65.0 Forge +Feb-03 507,400 691 734 3418 4.946 212.9 420 308 62.3 Forge +Mar-03 432,151 639 676 3629 5.679 262.3 607 411 72.3 Forge +Abr-03 467,668 699 669 3878 5.548 253.7 543 363 65.4 Forge +May-03 433,922 661 656 3322 5.026 212.7 490 322 64.0 Forge +Jun-03 373,818 631 592 3926 6.222 272.0 728 431 69.3 Forge +
OPERATIONAL RECORDS
Balls ConsumptionSupplier
Algunosmesesdespus...
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Satiy cuanto tiempotendriamos que hacer la
prueba industrial con unmes es suficiente..?
Don Eme..Lamentablementeuna prueba industrial debeser lo suficientemente largacomo para cumplir el periodode purga y luego recin poderevaluar..
Oooh ... Y como es eso de la purga..?
Ahora se lo explico..Con la ayuda deMoly-Cop Tools,
Emeterio Saturnino
Prctica Operacional
Criterios de recarga de bolas
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Frecuencia : La recarga de bolas debe ser idealmente continua a
fin de mantener constante el nivel de carga en el molino. La recargauna vez por turno e incluso una vez al da se puede considerar
suficientemente continua para todos los efectos prcticos.
Velocidad de Recarga : Tpicamente, existen 3 opciones:
Recargar (t t /103) tons de bolas, siendo t las horas deoperacin transcurridas desde la ltima recarga.
Recargar (E E /106) tons de bolas, siendo E los kWh deenerga consumidos por el molino desde la ltima recarga.
Recargar (M * M /106) tons de bolas, siendo M las toneladasde mineral molidas desde la ltima recarga.
El periodo de Purga
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020
40
60
80
100
0 W 1 W 2 W 3 W 4 WConsumo Acumulado
%CaRm
e
Se considera innecesario extender elPerodo de Purga ms all del
tiempo requerido para consumir el
equivalente a dos veces la carga de
bolas en el molino (2W).
El perodo de evaluacin de la nueva condicin de recarga debe comenzarslodespus que ha transcurrido un Perodo de Purga razonable, definido ste
como el tiempo requerido para que todo remanente de las bolas antiguas sea
completamente removido del molino.
tmax = (dR - dS) / kd
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La correlacion de benavente para kde,m/(kWh/ton)
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Del anlisis detallado de ms de 30 aplicaciones de molienda, H.Benavente (de Moly-Cop Per) desarroll una interesante
correlacin entre la Constante Especfica de Desgaste (kdE)
observada y los correspondientes indice de Abrasin de Bond (AI),
Tamao de Alimentacin (F80) y pH de la pulpa en el molino :
kdE = 1.29 [(AI - 0.02)/0.20]0.33 (F80/5000)
0.13 (pH/10)-0.68
La correlacion de benaventepara
kde, m/(kWh/ton)
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0112233
0 0.5 1 1.5 2 2.5 3k d E (exper im ental )
k(aua
kdE = 1.29 [(AI - 0.02)/0.20]0.33 (F80/5000)
0.13 (pH/10)-0.68
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Comentario Final
Indicadores alternativos de consumo
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El mejor indicador de calidad intrnseca de los medios de molienda
es la Constante de Benavente kdB, aceptando que dependera slo
del respectivo Proveedory nada ms.
Indicador ton/hr kW % W io F80 P80 Indice pH CalidadLlenado Recarga Abrasin Pulpa Bola
Consumogr/ton kg/hr gr/kWh
Calidadkd kdE kdB
Variables Operacionales / Propiedades del Mineral
Mediciones de Indice de AbrasinMineria Peruana
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Moly-Cop Tools TM
ABRASION_INDEX : Database
Customer Date Ore Type Ai Bond F80 Slurry pH gr/mt gr/Kwh
Antamina Jul-10 Cu, Mo 0.1383 2800 10.3 357.0 64.2
Antamina Jun-10 Cu, Zn 0.1531 2800 10.3 398.0Ares Jun-10 Au, Ag 0.2618 710 11.5 1109.0 78.2
Brocal Ago-10 Pb, Zn 0.1369 2000 8.5 288.1 96.5
Brocal Ago-10 Cu 0.3942 2000 8.5 288.1 96.5
Cerro Lindo Jun-10 Py, Cu, Pb, Zn 0.1699 10500 10.5 717.5 92.9
Cerro Lindo Jun-10 Py, Cu, Pb, Zn 0.3656 10500 10.5 717.5 92.9
Cerro Verde Jun-10 Cu, Mo 0.1879 3000 11.0 693.4 67.8
Cuajone May-10 Cu, Mo 0.1384 9500 11.6 622.1 53.2Cuajone May-10 Cu, Mo 0.3888 9500 11.6 622.1 53.2
Goldfields Abr-10 Cu, Au 0.3519 2500 9.0 690.0 68.0
Horizonte 29/09/2010 Au 0.2786 4900 8.0 425.0
Minsur Jun-10 Sn 0.3573 1400 7.3 147.5 82.5
orcopampa Ago-10 Au, Ag 0.2167 3000 10.5 1076.3 87.4
orcopampa Ago-10 Au, Ag 0.3980 3000 10.5 1076.3 87.4
Pallancata 27/08/2010 Au, Ag 0.6374 7100 7.5 437.0 93.3Quechua Ago-10 Cu, Au, Mo 0.4127 4000 10.5 639.9 47.8
Toquepala 14/08/2010 Cu, Mo 0.2420 12700 11.6 725.9 54.7
Toquepala 14/08/2010 Cu, Mo 0.2478 12700 11.6 725.9 54.7
Yanacocha Sep-10 Au, Ag 0.2842 30000 10.0 2250.0 137.5
Yanacocha May-10 Au, Ag 0.6919 80000 10.0 3783.0 137.5
Yauliyacu 24/09/2010 Cu, Pb, Zn, Ag 0.4550 1300 8.0 355.5 78.2
Yauliyacu Ago-10 Cu, Pb, Zn, Ag 0.5649 1300 8.0 355.5 78.2
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8/12/2019 MCTools Basic II
79/82
Ejercicio de Estimacin de Consumos debolas de acero
-
8/12/2019 MCTools Basic II
80/82
An Arrium company
gr/kWh gr/kWh
Total # of Balls # of Broken Events/ gr/ton (gross) (balls) kg/hr ton/month %
# of Drops in Tube Balls Impact
10,000 24 0 0.000E+00 0.0 0.00 0.00 0.0 0.0 0.0
575.9 53.21 64.97 230.4 152.6 100.0
Spec. Area, m2/m3(app) 62.14 m
2/m
3(app)
Total Charge Area, m2
4265 m2
575.9 53.21 64.97 230.4 152.6 100.0
Purge Time, hrs 4,681 hrs
Default
Wear Rate Constants, Values Overall
Bond's Abrasion Index 0.22 0.22 kg/hr % kg/hr % kg/hr
Fresh Feed F80, m 5000 5000 0.9 100.0 0.0 0.0 0.9 Slurry pH 10.5 10.5
Benavente Constant, kdB
1.29
kdE
1.250 m/[kWh/ton]
kd 0.0139 mm/hr
SCRAP GENERATION
Nuclei Fragments
Caused by Wear
Overall
Caused by Breakage
DBT Test Results BALL CONSUMPTION RATES
-
8/12/2019 MCTools Basic II
81/82
-
8/12/2019 MCTools Basic II
82/82
An Arrium company