#### Performance Characteristics and Optimisation of the ...

by the installation of a 12MW SAG mill with a diameter of 10.97m (36ft). The mill, when built, was the largest SAG mill operating at any existing Australian mine. To aid in commissioning and optimising the mill, the Julius Krutt- schnitt Mineral Research Centre (JKMRC) and plant staff con- ducted extensive surveys of the grinding circuit.

#### Changing sag mill liners type from Hi-Low to Hi-Hi at ...

· helps understand charge motion in SAG mills for the given liner designs and lifters, ball size and rock properties, and mill operating conditions. Based on the success of the 2-D model of the SAG mill, the 3-D model in DEM was developed. These types of models could help study charge motion, power draw, liners wear, and energy draft

#### Mill (grinding) - 3D Libary - 3D Data - PARTcommunity

SAG mill. SAG is an acronym for Semi-Autogenous Grinding. SAG mills are autogenous mills but 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.

#### Vertical Sag Mill DWG Block for AutoCAD • …

Sag Molino vertical Language N/A Drawing Type Block Category Industrial Additional Screenshots File Type dwg Materials Measurement Units Footprint Area Building Features Tags autocad, bergbau, block, bohr, drilling, DWG, …

#### 'Design of the Biggest Mill in the World' by: R

From analysis of the pilot plant data, it was determined that the lowest SAG mill power draw would be 7.0kWh/t when using a 12% ball load and low rock load. For an overall circuit power of 14 ...

#### SAG mills (semi-autogenous grinding mills) - Metso Outotec

Gearless mill drive (GMD) technology has further expanded the use of large SAG milling allowing Metso Outotec to produce the world's largest SAG mill of 42' in diameter drawing power at 28 MW. Today, Metso Outotec is the world leading supplier of gearless SAG mills operating globally.

#### Model:Bond/Barratt SABC Models - SAGMILLING.COM

· Bond/Barratt Specific Energy Consumption SABC Model. This is a SAG or AG mill plus ball mill model that estimates the overall circuit specific energy consumption using the classical Bond work index equation for multi-stage crushing and single-stage ball milling (E ssbm) including Rowland efficiency factors.The circuit E total is equal to the E ssbm plus an inefficiency factor …

#### Semi-autogenous grinding (SAG) mill liner design and ...

· diameter and drawing 20 to 22 MW (Jones, 2006). Mill liners provide the replaceable wear-resistant surface within grinding mills; they also impart the grind-ing action to the mill charge, and at the discharge end, remove the ground contents of the mill. In recent years, as SAG mills have grown in size, the process aspects of

#### Choosing a SAG Mill to Achieve Design Performance

· SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates. Typical tests required to define a hardness variability function, are given below in Figure 1.

#### New SAG Mill Model for Better Mine-to-Plant Planning

· D80 SAG feed, mm 84.3 84.3 62.5 J Total SAG mill, % 27 32 32 J B SAG 14.7 14.7 14.7 J B BM1 32 32 33 J B BM2 32 32 33 Summary of Results The integral optimization is limited by boundary conditions, such as the maximum powder factor depends on bench stability rather tan benefit at the SAG mil. Main results and conditions are listed below:

#### The engineering and process effects of choosing a motor ...

· C × 42.2 × (D – 2d)-0.5 (2) where, ⌽ RPM is the mill rotational speed, revolutions per minute ⌽ C is the mill rotational speed, fraction of critical speed (eg. 0.72 for 72%) D is the mill nominal diameter inside the shell, m d is the mill liner nominal thickness, m Figure 4: „Tent" diagram for the Cadia SAG mill described in Figure 3

#### Optimization of mill performance by using - SciELO

· The performance of tumbling mills is sensitive to the volumetric mill filling which influences grinding media wear rates, throughput, power draw, and product grind size from the circuit. Each of these performance parameters peaks at different filling values. In order to contin-uously optimize mill operation, it is vital to

#### Dynamic Modeling and Simulation of SAG Mill Circuits …

AG/SAG mill is inefficient in grinding particles of a certain size, typically in the range of 25-55 mm, i.e., pebbles. Therefore, cone crushers are often used as pebble crushers and integrated into AG/SAG mill circuits to break the critical size particles that accumulate in the mill and to increase the performance of the primary grinding circuits.

#### SAGDesign Test | Starkey and Associates Inc.

The SAG mill pinion energy, W SDT (kWh/t) and SAG discharge Bond ball mill work index, S d-BWI (kWh/t), are then used to calculate the total energy to grind the ore from 80% passing 152 mm to 80% passing the client specified final …

#### Grinding Mill Computer Model

· Mill diameter inside liners - D D = Dshell-0.15 Allowance for liners Approximate mill diameter is derived from: Power =5.*6115 DL24. 6* La= * D where a is the aspect ratio L/D derived from a regression equation on 25 manufacturers' mill size and power relationships For SAG mills the equation becomes Power=(5.6115+%balls*0.1438)*D24. 6* L

#### Aktivitas metalurgi inspeksi mill

· Gambar drawing liner SAG Mill yang menunjukkan potongan liner pada sisi DIscharge, Feed dan shell area (sumber foto pribadi) Secara garis besar, area liner dalam sebuah Mill dapat dibagi menjadi 4 bagian: Feed Area : ini adalah sisi dimana umpan material ...

#### 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 ...

#### SAG Mill Grinding Circuit Design - 911metallurgist.com

Brian Loveday published a simple SAG mill model (Loveday, 1978) of the form in Equation 2. The equation uses mill dimensions (inside the liners), the density of the mill charge and an empirical "power number" that encapsulates the mill speed and volumetric filling. .0 %(1 234 (2) Where: • D is the mill diameter inside the liners, m

#### SAG Mill - Semi-Autogenous Grinding Mill

· A line drawing of the Fort Knox SAG mill liner configuration and spare liners awaiting installation. Five and one quarter inch steel grinding balls - cannon balls - occupy 8% of the mill volume and are consumed in the grinding action at the rate of 600,000 pounds per month.

#### GROSS POWER CALCULATOR - SMC Testing

· predicted. Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry pool. This phenomenon results in overflow mills usually drawing less power than grate discharge mills that are operating without a slurry pool. This is because by definition overflow mills operate all of the time with a slurry pool.

#### A Method of C alculating Autogenous/ Semi …

· SAG mill energy required according to this statement, is 2.5 times more than the Ab value to produce the same degree of particle breakage. There is a speci ﬁ c gravity factor that affects AG/SAG power draw. The lighter material, in the 2.5 speciﬁ c gravity (SG) range, will require more energy to grind to the same transfer

#### Austin SAG model - SAGMILLING.COM

· History. The SAG mill model by proposed by Leonard Austin (1990) was largely based on modifications of earlier tumbling mill models by Hogg & Fuerstenau and F. Bond. The model uses a kinetic-potential energy balance to describe the power draw of a mill charge. Many geometric components of the earlier models were fit to empirical relationships measured by …

#### Benefits of Dynamic Process Simulation for Mineral …

The ore is transported by a belt conveyor, mixed with water and sent to a SAG mill. The pebbles from the SAG mill are sent to a screen and then a pebble crusher. The crusher discharge and the product from the SAG mill are collected in a sump box where they are mixed with additional water. The slurry is pumped to a battery of hydrocyclones, the ...

#### AN UPDATED DATA SET FOR SAG MILL POWER MODEL …

SAG mill power draw models are used in mill design and grinding circuit modelling to predict how much power will be consumed by a particular mill geometry and operating configuration. The importance of conducting surveys suited to model calibration …

#### SHEET METAL DESIGN HANDBOOK - Thomasnet

· Drawing shapes Drawing Radii - 2 - Forming Basics Press brake forming-The fundamental advantage of a press brake as a forming tool is its flexibility. By using standard vee-dies, cost savings can be realized through economical set-ups and run times on small lots and prototypes. In addition to these considerations, using the

#### PRE ENGINEERED BUILDING( PEB)

· The engineering drawings for the sandwich panels are done by SUNTECH so are the production of trims and the supply of all ... Connection Bolts, Expansion Bolts and Sag Rods). Profiled, mill finish and prepainted, roof & wall panels and trims & flashings which include eave gutters, downspouts, ridge panels, curved eave panels, etc.

#### (PDF) LARGE DIAMETER SAG MILLS NEED …

This paper. reviews some of the issues related to sizing of large diameter ball mills. including power draw, residence time, fe ed size and the applicability of. Bond's equations. Data from a ...

#### SAG mill | 3D CAD Model Library | GrabCAD

· SAG mill. A semi-autogenous grinding mill, or Sag mill, is responsible for grinding materials from large chunks into small, usable pieces for processing. The Sag mill is usually part of the primary stage in the grinding process. …

#### SAG MILL DISCHARGE SCREENS-TROMMEL vs. …

· SAG MILL DISCHARGE SCREENS-TROMMEL vs. VIBRATING Tony Moon, RTZ What I'd like to talk about is probably one of the nastiest bits of mill design for a grinding circuit, and that is the choice of what do you use on a SAG mill discharge? Do you use ... This next picture is a scale drawing of one of the trommels. The slurry discharges out of

#### CONGA: THE WORLD'S FIRST 42 FOOT DIAMETER 28 …

· 1 CONGA: THE WORLD'S FIRST 42 FOOT DIAMETER 28 MW GEARLESS SAG MILL T. Orser1, V. Svalbonas 2 and *M. Van de Vijfeijken 3 1Newmont Mining Corporation 10101 East Dry Creek Road Englewood, CO 80112, USA 2Metso Corp. 2715 Pleasant Valley Rd.