14. presentación nº 14 - díaz y luer - ingeniería y tecnología ltda

27
MODELOS PARA MOLIENDA SAG Paul Díaz Daniel Luer

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  • MODELOS PARA MOLIENDA SAG

    Paul DazDaniel Luer

  • Metodologas estimacin CEE SAG

    JK con su simulador JKSIMMet, utiliza parmetros de dureza Axbdeterminados por pruebas drop weight test, SMC or JKRBT

    SGS con su simulador CEET, utiliza parmetros de dureza crusher index y SPI

    Steve Morrell con metodologa publicada para determinar potencia total del circuito de conminucin

    Dereck Barrat que utiliza los indicadores de dureza desarrollados por F. Bond para molinos de barras y bolas

    Pruebas Piloto calibradas con alguna instalacin existente

    I&T que utiliza ecuacin (publicada por S Morrell) basada en las propiedades de los minerales y condiciones operacionales, la ecuacin se calibra con datos industriales

  • Introduccin Simulaciones Conminucin

    Fragmentation modelblasting

    Grinding Circuit Model

    Crushing Circuit ModelOre Characterization

  • 25 mts

    15 m

    ts Tph_

    Cu Rec

    CuT

    Density

    Volume

    Con Grade

    X, Y, Z

    Lithology, Minzone, Alteration, Domains

    Structures

    Metallurgical Recovery

    Hardness(PLT, BWI, Axb)

    Tons per Hour

    Mineralogycc, cv, cpy, py, etc

    Introduccin Simulaciones Conminucin

  • kw: shell power,kwh/t : specific energy, F80: Feed sizeT80: transfer size (m), Wi: Bond work index (kwh/t), P80: grinding product size (m).

    P80

    kw

    T80kw

    Kwh/tBM = f(Wi, T80, P80, Ops)

    Kwh/tsag = f(Axb, Dwi, Mia, Mib, Mic, F80, T80, Ops)

    TPH Circuit

    Introduccin Simulaciones Conminucin

  • Ejemplo JK

  • Ejemplo JK

  • Resultados JK

  • Modelos con SPI

    P80

    kw

    T80kw

  • Modelo D Barrat

    Donde:- WIC: Work index de chancado- WIR: Work index Molienda de Barras- WIB: Work index Molienda de Bolas

    - FB, FC, FR, son tamaos 80% pasante de alimentacin- PB y PC son tamaos 80% pasante de Producto

    [Ecuacin Barrat]

  • SMC, muestras con datos de SG, Axb y Dwi (Test SMC y Bond)

    CEE por Morrel

    Reference:Using the SMC test to predict comminution circuit performance

  • CEE por Morrel

    Reference:Morrell, S., 2009., Predicting the overall specific energy requirement of crushing, high pressure grinding roll and tumbling mill circuits, Minerals Engineering, (14 February 2009)

  • CEE por Pilotajes

  • Metodologa I&T para molienda SAG

  • DWi = rock strength indexF80 = 80% passing size of the feedJ = volume of balls (%) = mill speed (% of critical)f(Ar) = function of mill aspect ratio

    (length/diameter)a,b,c,d,e = constantsK = pebble crusher function

    kWh/t K.F80a.DWib.(1+c(1-e-dJ))-1.e.f(Ar)

    DWi Equations for AG/SAG kWh/t

    TPH = Power draw (kW) / kWh/t

    Reference:Morrell, S., 2004a. Predicting the Specific Energy of Autogenous and Semi-autogenous Mills from Small Diameter Drill Core Samples. Minerals Engineering, Vol 17/3 pp 447-451

  • MetodologaSe utilizaron los datos industriales diarios.

    Se utilizo la informacin de los modelos de bloquepara determinar Axb (a nivel diario) y el % departicipacin de las unidades Geo metalrgicas.

    Se realiza ajuste, mediante mnimos cuadrados, de laecuacin de JK para encontrar las contantes delmodelo

    Finalmente se compara los resultados industrialesreales CEE (kwh/t) con los predichos por la ecuacin.

  • Base datos de resultados I&T

  • Base datos de resultados I&T

  • Muestreos I&T para molienda

  • Muestreos I&TPlanningPreparationStream samplingMeasurementsData analysis and reporting

    Ore supply: Crusher set up:Mill set up:Cyclone set-up:Conveyor belt speed check for sample mass estimatesSelection of sample points and cutters Sample preparation procedures for slurry and belt samples

    Steady state operation (min. 1 hour)

    Pulp sampling (1 hour)

    Crash stop SAG mill (1 hour)

    Restart operations (1 hour)

  • Muestreos I&T

    Stream NameMass

    Flow t/h (Yes/No)

    Sample point

    (Yes/No)1 Fresh feed Yes Yes2 SAG feed Yes Yes3 SAG discharge No ??4 Screen O/S Yes Yes5 Crusher product Yes No6 Screen U/S No ??

    ANDACOLLO SAG AND PEBBLE CIRCUIT

    STOCKPILE

    SAG

    PEBBLECRUSHER

    SCREEN

    1 432

    5

    6

  • Muchas Gracias

  • Back Slides

  • Muestreos I&TPlanning

    Resources, Scheduling, ResponsibilitiesPreparation

    Ore supply: hard competent Hypogene ore needed, P80

  • Muestreos I&TOre supply: hard competent Hypogene ore needed

    Ideal P80

  • Muestreos I&TSteady state operation (min. 1 hour)

    Stockpile and bin levels med-high

    Fresh feed rate constant

    SAG power and mill load stable

    Water addition constant

    Pulp sampling (1 hour)

    Simultaneous stream cuts taken

    Each slurry sample taken in duplicate

    Take 6 cuts at 10 minute intervals for one hour as long as plant is stable

    Cuts combined to produce two composites for each stream

    Crash stop SAG mill (1 hour)

    Lock out SAG mill and all conveyors

    Collect the three conveyor belt samples

    Pull feed chute and measure SAG load

    Restart operations (1 hour)