Sag Mill Feed Size Distribution

  • SAG Mill Grinding Circuit Design
    Semi Autogenous Design FactorsSag Mill Operation ExampleProcess Plant DescriptionSag Mill Design and SpecificationOperating Problems Since CommissioningDesign Changes and Future Operating StrategiesThe design of large mills has become increasingly more complicated as the size has increased and there is little doubt that without sophisticated design procedures such as the use of the Finite Element method the required factors of safety would make large mills prohibitively expensive.In the past the design of small mills, up to +/- 2,5 metres diameter, was carried out using empirical formulae with relatively large factors of safety. As the diameter and length of mills increased several crit...
  • THE APPROPRIATENESS OF THE TRANSFER SIZE IN AG AND SAG

    Problems (inaccuracies), however, arise when applying power-based equations when the feed and/or product size distributions depart from this condition, and the more they depart the more inaccurate will become the predictions. In the case of SAB/SABC circuits the transfer size is the product of the SAG mill circuit and the feed of the ball mill

  • (PDF) Influence of feed size on AG / SAG mill

    The feed size distribution together with the ore characteristics (hardness, lithology, alterations, etc.) are the most important factors affecting the SAG mills performance. Some oper- ations have recognised an opportunity in the relationship between feed size and mill performance and manipulate feed size to obtain efficiency improvements (Morrell and Valery, 2001) .

  • Modelling SAG milling power and specific energy

    distribution affects the SAG mill load and the load affects directly the mill power and the efficiency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill has been designed with a conventional power or specific energy model which do not con-sider the projected feed size distribution it is likely that this mill

  • SAG Mill Control at Northparkes Final Semantic Scholar

    Changes in both the size distribution (f80) and hardness (work index) of the feed are the most important disturbances affecting SAG mill behaviour. Size distribution can be measured using image analysis techniques and used as a feedforward signal for improving load control.

  • Model Predictive Control for SAG Milling in Minerals

    Model Predictive Control for SAG Milling in Minerals Processing 5 Model Predictive Control on a SAG Mill and Ball Mills The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure.

  • SAG Mill Feed moisture sample Grinding &

    Grinding & Classification Circuits. The main objective is to determine the moisture content of sag mill feed for daily report. The last time we collected the samples around 1000kg (this was also for the distribution size analysis) and it was in December 2012.

  • Choosing a SAG Mill to Achieve Design Performance

    Choosing a SAG Mill To Achieve Design Performance John Starkey1, Principal Consulting Engineer Sami Hindstrom2, Manager, SAG mill is an investment that can produce handsome returns if extra production is needed or Where x = the load in the mill expressed as measured % by volume and y = kg/h of feed.

  • A Method of C alculating Autogenous/ Semi-Autogenous

    stage ball mills, rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method. Rod mill and AG/SAG mill products are similar and tend to be not as steep as a 0.5 slope when plotted on log-log paper. This is because the particle size distribution (PSD), these mills

  • A = 69.3, b = 0.54 and Axb = 37.4 (Wtd Fit)

    match the specific energy required for an existing or a planned AG/SAG mill due to differences in the many operating and design variables such as feed size distribution, mill dimensions, ball load and size and grate, trommel and pebble crusher configuration. However, the “Standard” circuit specific energy

  • A Method of C alculating Autogenous/ Semi-Autogenous

    stage ball mills, rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method. Rod mill and AG/SAG mill products are similar and tend to be not as steep as a 0.5 slope when plotted on log-log paper. This is because the particle size distribution (PSD), these mills

  • Chapter M MODELLING, SIMULATION, OPTIMIZATION

    operation fluctuations. To sample SAG mill fresh feed, belt conveyor was stopped and a sample was taken by removing material over a two-meter length. Operating condition during sampling was recorded. Particle Size distribution of all samples except mill fresh feed and scats reject was determined using 6730 to 38 µm screens.

  • Application of Operating Work Indices in Autogenous

    Corrected Ball Mill Feed, and 3. T2’: the particle size distribution of the Corrected Ball Mill Feed. With two equations and three unknowns, there are several solutions to equations [5] and [6], depending on the value attributed to the Fines Factor (Q1), each yielding different Corrected Ball Mill Feed Size Distributions (T’2). This is

  • Feed Size Distribution Feedforward Control for a

    The challenge for any grinding mill controller is to reject disturbances caused by changes in feed-size distribution and feed ore hardness. To improve the ability of the controllers to reject disturbances in the ore feed size distribution, a feedforward controller is designed. The system block diagram is

  • SAG Mill Optimization using Model Predictive Control

    SAG MILL OPTIMIZATION USING MODEL PREDICTIVE CONTROL . W.A. Gough, P.Eng. ore feed size distribution or mill rotation speed are also included in the control design, then the expert rules become even SAG Mill Optimization using Model Predictive Control

  • TECHNICAL NOTES 8 GRINDING R. P. King

    LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the

  • Optimum choice of the make-up ball sizes for

    Optimum choice of the make-up ball sizes for maximum throughput in tumbling ball mills. Author links open overlay panel Heechan Cho Jihoe Kwon Kihong Kim Myoungwook Mun. Show more. However, their work was based on one set of milling conditions, one set of a feed size distribution and breakage characteristics, and one mill diameter.

  • OUTOTEC GRINDING TECHNOLOGIES

    used where a narrow product size distribution is required (for example, for subsequent gravity separation). MH Series Grinding Mills A standard range of SAG, ball, and rod mills with spherical roller bearing technology, enabling faster delivery and start-up lead time. OUR MILL RANGE Pebble mills Outotec has a long history of successfully

  • A Neural Network Model for SAG Mill Control

    feed size distribution, each SAG mill will process between 700 and 3000 tph. The budgeted average total throughput is 88,000 tpd. THE OK TEDI ADVANCED CONTROL . SYSTEM IMPLEMENTATION The SAG expert system at Ok Tedi was . completed in 1999, described previously by McCaffery, Katom, and Craven (2001).

  • AMIT 135: Lesson 6 Grinding Circuit Mining

    The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill.

  • A Neural Network Model for SAG Mill Control

    feed size distribution, each SAG mill will process between 700 and 3000 tph. The budgeted average total throughput is 88,000 tpd. THE OK TEDI ADVANCED CONTROL . SYSTEM IMPLEMENTATION The SAG expert system at Ok Tedi was . completed in 1999, described previously by McCaffery, Katom, and Craven (2001).

  • AMIT 135: Lesson 6 Grinding Circuit Mining

    The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill.

  • SAG Mill Feed The Beast Wiki

    The SAG Mill is a block added by the EnderIO mod. A machine similar to a Pulverizer or a Macerator. It is used to process resources to produce dust. It accepts energy in the form of Redstone Flux or Minecraft Joule, with an internal buffer of 100,000 RF and consumption of 20 RF per tick.

  • Mill (grinding) Wikipedia

    SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.

  • The influence of feed size on autogenous and semi

    This sensitivity is due to the reliance of ag/sag mills on the feed ore for their grinding media competence and size. Autogenous (ag)mills are the most sensitive in this respect with semi-autogenous (sag) mills being increasingly less so as the ball charge is increased.

  • Improved Relationships for Discharge in SAG/AG Mills

    of grate/pulp lifter design in AG/SAG mill discharge. The current understanding from literature lacks knowledge of mill content size distribution and its effect on discharge through the grate at various aperture sizes and radial positions. It also indicates that in

  • Comminution Wikipedia

    For comminution of finer particle size ranges (20mm > P 80 > 30 μm) machines like the ball mill, vertical roller mill, hammer mill, roller press or high compression roller mill, vibration mill, jet mill and others are used. For yet finer grind sizes (sometimes referred to as "ultrafine grinding"), specialist mills such as the IsaMill are used.

  • Model:Morrell HPGR and ball mill

    Ball mill Wi test product size, P 80, µm; Ball mill Wi test feed size, F 80, µm; Ball mill Wi grams per revolution at test conclusion, gpr; Required parameters. F 80, µm is the 80% passing size of the fresh feed to the circuit, ie, primary crusher product (expected to be a Bond-compatible size distribution). Pc 80, µm is the 80% passing

  • ACT Grinding Optimization System Outotec

    Outotec® ACT Grinding Optimization System. Increase efficiency and performance of your grinding circuit. Outotec’s ACT grinding optimization system with the RockSense on-belt rock size analyzer, MillSense charge analyzer, and PSI particle size analyzer gives you a complete solution for optimizing your entire grinding circuit.

  • Throughput optimisation in milling circuits

    If the mill feed setpoint is changed, then the actual feed rate needs to stabilise at the new target in a short period of time. The feed rate setpoint can then be tied into a SAG mill power optimisation strategy. Sag Mill Discharge. Controlling the feed and discharge of a mill is mostly a stabilisation exercise you need to be able to