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Grinding Circuit - an overview | ScienceDirect Topics

The circuit comprises a SAG mill, 12 m diameter by 6.1 m length (belly inside liners, the effective grinding volume), two pebble crushers, and two ball mills in parallel closed with cyclones. The SAG mill is fitted with a 20 MW gearless drive motor with bi-directional rotational capacity.


PDF | Kinross Paracatu and Process Technology and Innovation (PTI) have reviewed and optimized the operating strategies for the SAG mill circuit at Paracatu operation in Brazil. The focus of ...

SAG Milling in Australia -Revised Submission

circuiting of the SAG mill and ball mill additions topping the list. The drive for low operating cost has seen the retention of fully autogenous circuits in some large installations, notably Olympic Dam. ISSUES IN MILL AND CIRCUIT DESIGN Shell Support versus Trunnions

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

Of course, the specific energy value quoted for the "Standard" AG/SAG circuit will not necessarily 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

Grinding 3 - Circuits - Edumine Online Course

A course for process engineers, mill operators and students. Grinding Circuits is the third of a suite of three courses on grinding theory and practice from Performance Solutions. Topics include Grinding Circuit Basics, AG and SAG Mill Circuits, and Ball and Rod Mill Circuits.

Autogenous mills, semi-autogenous mills and ball mills for ...

SAG/ball mill circuit incorporating pebble crushers and a POLYCOM® high-pressure grinding roll. SAG and ball mill for gold ore grinding. One of three SAG mills with 9.75 m diameter and 2 x 4000 kW drive power. These mills operate in conjunction with ball mills for iron ore grinding in Iran.

AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator ...

SAG Mill Circuit Example – Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill

Grindin' at the Mill - investigating bottleneck in ...

Mill throughput is a key driver for maintaining profitability at Mt Keith because of the low head grade (~0.5% Ni) and inherently low nickel recoveries due to the mineralogical makeup of the ore. The Nickel West Mt Keith Concentrator (NMK) has 2 parallel grinding modules consisting of one SAG Mill and one BALL Mill per module.

Autogenous and Semiautogenous mills -

Simplifying wet grinding with AG/SAG mills AG/SAG mills are often the optimum solution for wet grinding (achieved in a slurry 50 to 80 percent solids). AG/SAG mills can accomplish the same size reduction work as two or stages of crushing and screening, a rod mill, and some or all of the work done by a ball mill.

Advanced Controller for Grinding Mills: Results from a ...

Advanced Controller for Grinding Mills: Results from a Ball Mill Circuit in a Copper Concentrator Anoop Mathur, Sujit Gaikwad, Honeywell Technology Center ... upsets such as mill spills and/or power excursions in SAG mills, "centrifuging" in ball mills, etc.

Mineral Processing - Mineral Consultants - Metallurgy - OMC

Orway Mineral Consultants (OMC) is a Perth and Toronto based metallurgical consultancy providing a range of services to the mineral processing community. The consultancy, established in 1983, has a reputation for the delivery of high quality studies and practical engineered solutions in the areas of comminution, beneficiation and hydrometallurgy.

Starkey & Associates Inc. - Leaders in Comminution Design

Starkey & Associates uses the patented SAGDesign technology to calculate accurate mill sizes from measurements on a client's own ore samples. SAGDesign technology has become a standard for 21 st century grinding circuit design for the following reasons: Precisely measures SAG and ball mill …


DESIGN OF AG/SAG MILL CIRCUITS USING THE SMC TEST. ... Optimisation of the Cadia Hill SAG Mill Circuit. Proc. Int. Conf. Autogenous and Semi-autogenous Grinding Technology, vol 1, pp.11-30. ...

or 'Mine-to-Mill 2.0' -

pass through SAG mill onto ball mill circuits ... "Beyond Mine -to-Mill – circuit design for energy efficient resource utilisation", Powell & Bye, AusIMM Tenth Mill Operators Conference, Adelaide 2009, p.357 -364. Primary Crusher Cyclones Stockpile Screen Primary Mill Secondary Mill

Autogenous and Semi-Autogenous Mills

of the work of a ball mill. Because of the range of mill sizes available, AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill-ball circuit. All of the above contributes to lower capital cost and lower maintenance cost for an AG/SAG mill circuit and accounts for the current popularity of this type of size


The FAG mill feed conveyor delivers ore into the feed hopper, the hopper also receives mill dilution water at a measured and controlled rate. The mass, load and power consumption of the mill is measured by mill bearing back pressure as well as an online acoustic device (SAG analyser).

Selection of Comminution Circuits for Improved Efficiency

In addition, the size distribution and grinding circuit chemistry may impact on the performance of the downstream circuit (Lane, 1999 and Rantanen, 1996). Fully autogenous circuits are attractive due to the elimination of steel media costs. Typically, a SAG mill based circuit (P80 of 106 to 150 um) has media costs of around A$1/t.

Optimizing your SAG mill operation - International Mining

In multi-stage ABC/SABC circuits, the AG or SAG mills are in closed circuit with screens and pebble crushers. The mill discharge from these mills consists of slurry, which goes to the ball mills for further grinding, and coarse pebbles/rocks, which are crushed and sent back to the mill.

Mill (grinding) - Wikipedia

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.

Open Circuit Configuration - IsaMill™ Advantages | Isamill

Open Circuit Configuration ... and high tip speed of the separator means that the mill constantly delivers sharp sizing performance. ... The type of media used in the IsaMill™ ranges from effectively 'free' media source including smelter slag and coarse SAG Mill product, to low cost locally available sands through to more expensive, high ...

A comparative - ceecthefuture

proposed circuit consists of a SAG mill 40 feet in diameter and 25 feet in length (EGL), with an installed gearless motor of 24 MW and two 28 feet diameter by 44.5 feet in length ball mills equipped with 22 MW gearless motors. The circuit would operate in SABC-B configuration with two pebble crushers equipped with at least 750 kW motors.


The circuit consists of a 34' x 20' EGL SAG mill, a Raptor 900 pebble crusher and two 24' x 39'6" ball mills. Each mill is equipped with a 2 x 8500HP dual pinion drive system. The plant was designed to process 1585 h mtpof SAG feed. From startup, the mill struggled to meet the required production rates.

Modelling SAG milling power and specific energy ...

approach the total specific energy of the entire AG/SAG circuit is firstly predicted using the SAG mill feed F80 and the ball mill cyclone overflow P80. Morrell's model (Morrell, 2011) relates the feed, mill geometry and operating conditions to the specific energy of the circuit. However, the F80 is not enough to represent properly

SAG-ball Mill Circuit | Crusher Mills, Cone Crusher, Jaw ...

rod mill-ball mill circuit receiving closedcircuit secondary … The rod mill circuit could not be simulated, … The high cost of the SAG/ ball option is caused by the extremely high cost of the pancake SAG mill—R86 million alone.


Even in its current state, the grinding circuit has seen a significant improvement from our SAG and ball mill expert control strategies implemented on the KSX expert system. Our 30 years of experience combined with KSX's power optimization tools can improve any grinding (SAG and ball mill) circuit without needing any additional ...

SAG Mill Grinding Circuit Design

Table of Contents Autogenous Grinding CircuitsSAG vs Ball Mill AdvantagesAG & SAG Mill Grinding Compared – Which is BestTesting for Product Size Size reduction is the most expensive operation in most mills. Crushing and grinding usually require the greatest portion of capital costs and often make up 60-70 percent of total mill operating costs as shown in Figure 1.

Model Predictive Control for SAG Milling in Minerals ...

The behavior of the SAG mill circuit is multivariable i.e. exhibit complex interactions and non-linear behavior between the process variables. It is also dynamic i.e. delay times between variables within the process need to be considered before control actions are executed.