sag mill ore hard soft control

Model Predictive Control for SAG Milling in Minerals

2016-6-21 · 2 Model Predictive Control for SAG Milling in Minerals Processing Ore from primary crushers is combined with water in the mill where rotation causes the grinding media and the ore to be drawn upwards with the mill liners and tumble, causing fracturing in the first instance, followed by further grinding. Mills can be open or closed circuit.

SAG Mill Control: It Shouldnt be that Hard

2010-4-13 · SAG Mill Control: It Shouldn’t be that Hard An economically appealing method for improving operations is available without the capital expense — get more out of a mill by applying the advanced control capabilities in the existing plant control system By Andrew Thornton

SAG Mill Control at Northparkes Final Semantic Scholar

2015-7-29 · SAG Mill Control at Northparkes Page: 1 mipac.au SAG Mill Control at Northparkes Mines (Not So Hard After All) A. J. Thornton, Principal Process Control Engineer1 Tom Pethybridge, Production Superintendent OPD2 Tom Rivett, Process Control Engineer2 Richard Dunn, Metallurgical Superintendent2 1.

Gearless Mill Drives ABB Ltd

2018-5-10 · Hard and Soft Rock Mining Screening Primary Crushing Coal Preparation Concentration Classification Water Tailings Pond Flotation Separation Conditioning Grinding Water SAG/Ball Mill Primary Crushing Ore Storage Leaching Leached Solution Dryers Electro-Winning Solvent Extraction Electrolyte Drives and process control systems

Autogenous & Semi-Autogenous Grinding Circuits

2020-1-10 · 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.

Difference Between Sag Mill vs Ball Mill mech4study

SAG mill make use of steel balls included with some large and hard rocks for grinding. These mills utilize the balls in making the large fragments of materials broken into pieces. The ball charge of a SAG mill is about 9% to 20%.This process takes place inside the large rotating drum of SAG mill which is

THE APPROPRIATENESS OF THE TRANSFER SIZE IN AG

THE APPROPRIATENESS OF THE TRANSFER SIZE IN AG AND SAG MILL CIRCUIT DESIGN 2. what the appropriate T80 value should be for a given ore type, circuit configuration, mill Cum % passing hard soft

Wayne Rogers, Phu Bia Mining, Laos Arthur Pacunana,

2018-7-9 · to with belt cuts taken from the subsequent hard ore blasting trials. Results of the CV01 belt cuts are shown below in . Figure 2. In this figure, the results of the baseline trials are shown in blue. Results indicate the SAG mill throughput will increase if the PSD of hard ore presenting to the SAG mill is optimized by: Increasing the % fines

AUTOMATION ADVANCED CONTROL SOLUTIONS FOR

present both in the ore feed system and within the mill itself. Additionally, BrainWave automatically adjusts its control settings to allow for different operation due to changes in ore hardness over time. With improved SAG mill control stability, the mill load can be optimized to increase crushing performance and production capacity.

Multi-component AG/SAG mill model CORE

Abstract. The JKMRC has been studying and modelling industrial AG and SAG mills for over 40 years, but the ability to simulate the effects of blending hard and soft components on mill

Evaluation of MPC strategies for mineral grinding

Evaluation of MPC strategies for mineral grinding. Author links open overlay panel Pablo Karelovic * Roberto Razzetto Manipulated variables for this controller are fresh ore feed to the SAG mill, water-to-ore ratio and SAG mill speed for the first stage; sump water feed and pump speed for each line of the second stage. Figure 6 shows

LOCKED CHARGE STARTS AND YOUR GRINDING MILL

2017-6-27 · LOCKED CHARGE STARTS AND YOUR GRINDING MILL Authors: Jeff Belke & Mitch Bertrand to fine ore. The pulp dischargers of a SAG mill continually pump the finer material out of the mill, lowering the total amount of residual fine ore and thus improving the situation in respect to locked charge starts. Hard start of mill motor, throwing ball

Implementation of a SAG Grinding Expert System at

Two aspects determine the success of the acceptance of the controller and hence utilisation: The involvement of the entire project team in all aspects of the project, and the robustness and performance of the controller. 3.4 SAG mill control logic aspects Sag mill operational states can be defined by combining the fuzzy beliefs of the measured

Outotec Grinding Mills Outotec

Our unique Outotec TPL™ technology improves grinding process efficiency the primary grinding process can be intensified for hard ores and material transport can be improved for soft ores. TPL is an environmentally friendly technology used to achieve higher energy efficiency from the grinding mill.

types of sag mill hardpressed.co.za

sag mill types . Grinding mill types. In a typical mine a SAG mill is a rotating cylindrical container that relies primarily on the tumbling action of chunks of ore to grind each other down to the size of . read more. Autogenous and SemiAutogenous Mills. of the work of a ball mill. Because of the range of mill sizes available, AG/SAG milling

OPTIMISATION AND CONTINUOUS IMPROVEMENT OF

2018-2-20 · From a SAG mill’s perspective, the UCS and BWi results indicate a wide variability in rock hardness with both M1 and M4A ore types exhibiting soft and hard behaviour. However, once reduced to ball mill feed size; the materials have similar properties with M1 exhibiting a slightly lower energy requirement compared with M4A.

11th International Symposium on Rock Fragmentation by

2018-7-9 · The feasibility design throughput of the mill with hard primary ores was assumed to be around 400 tph compared to 700 tph with oxide ore. Figure 1 below is a snapshot of throughput changes in the SAG mill while feeding the fresh hard ore. It can be clearly seen that mill throughput has dropped from approximately 700 tph when processing oxide ore

Authors: John Starkey, Starkey & Associates Inc. and Mike

2013-5-6 · Authors: John Starkey, Starkey & Associates Inc. and Mike Samuels, Fortune Minerals Limited New Discoveries in the Relationship Between Macro and Micro Grindability needed to describe the grinding properties of an ore for SAG mill design. We have selected the ‘macro to

Authors: John Starkey, Starkey & Associates Inc. and Mike

Crusher Wikipedia

2019-10-9 · A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. Crushers may be used to reduce the size, or change the form, of waste materials so they can be more easily disposed of or recycled, or to reduce the size of a solid mix of raw materials (as in rock ore), so that pieces of different composition can

INTERNATIONAL CYANIDE MANAGEMENT INSTITUTE

2016-6-14 · stockpiled on the fine ore stockpile and control-fed into the SAG mill. The SAG and the Ball mills grind the material into finer particles (P80 of 106 microns) since been upgraded to a maximum capacity of 6 million tonnes per annum of soft ore and 5.0 million tonnes per annum of hard ore. The primary crusher and both mills and

Slag Wikipedia

2020-1-7 · Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore.Slag is usually a mixture of metal oxides and silicon dioxide.However, slags can contain metal sulfides and elemental metals. While slags are generally used to remove waste in metal smelting, they can also serve other purposes, such as assisting in the temperature control of

INTEGRATING THE STRENGTHS OF SAG AND HPGR IN

2018-2-20 · INTEGRATING THE STRENGTHS OF SAG AND HPGR IN FLEXIBLE CIRCUIT DESIGNS *M.S Minimising materials handling issues, providing an ideal balanced feed to the AG or SAG mill, and improving controllability through shifting grinding load as the RoM feed changes, are all xCushioning effect of the soft component on the hard component can result

Phoenix: Big mill and latest tech keep long-lived mine

2019-9-3 · As the new editor of the Mining Quarterly, in early May I took my first mine tour, traveling to Newmont Goldcorp’s Phoenix mine about 12 miles southwest of Battle Mountain.

Soft Constrained MPC Applied to an Industrial Cement

2014-10-18 · MPC for an industrial cement mill grinding circuit and com-pares the performance of the soft MPC to the existing fuzzy logic controller. Conclusions are provided in Section 8. 2. Soft MPC Algorithm In this section, we describe the Soft MPC algorithm used to control the cement mill grinding circuit (Prasath and Jørgensen, 2009b).

Comparison of UCS to Bond Work Indices

Comparison of UCS to Bond Work Indices Alex Doll, Alex G Doll Consulting Ltd, Edmonton, Canada Derek Barratt, DJB Consultants Inc, North Vancouver, Canada Ken Wood, Fluor Mining & Minerals, Vancouver, Canada Abstract Unconfined Compressive Strength (UCS) is a commonly used rockmass strength measurement used by

Small-Scale Continuous SAG Testing Using the

2015-12-16 · allow for soft and/or dense ores. The mill is fed from a hopper by a the AG/SAG mill throughput, which in turn is driven by the dynamic of the ore. Ore A, which has a high ball mill work index, delivered an average size product P 80 for the test, while Ore B produced

Evaluation of Abrasive Wear Measurement Devices of Mill

2016-9-29 · In general, abrasive wear occurs when hard, sharp particles or rough surfaces contact soft surfaces and remove material by shearing it from the softer surface [3]. This abrasive wear, caused by the ore and the milling process, will decrease the liner thickness gradually until the mill has to be stopped for replacement of the liners. Since

Evaluation of Abrasive Wear Measurement Devices of Mill

Small-Scale Continuous SAG Testing Using the

Ring gear drives huge grinding mill Machine Design

2000-3-1 · Motors & Drives; Ring gear drives huge grinding mill. By this summer, a grinding mill that is bigger around than a Boeing 747 will turn chunks of copper ore into gravel-sized bits for smelting and

JKTech Technical Article

2017-3-27 · SAG Mill Crushability The comminution dataset consisted of57 drill core composites representing material from production periods across the life of mine. This data showed a wide range in both crushability (=impact resistance) and grindability. • Impact resistance as measured by the JK parameter A*b ranged from a very hard 25 to a soft 118,

Testing & Software JKTech

2017-11-23 · ore hardness. The SCSE was developed by extensive modelling over a range of A*b, ta and SG values, using the concept of a ‘standard’ SAG mill with pebble crusher circuit. The JK Bond Ball Mill (JKBBM) test, is a locked cycle grindability test conducted using a standard laboratory Bond Ball Mill with the same steel ball charge and

mining ball mill wonder-parties.co.za

Ball mill Wikipedia, the free encyclopedia A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing .. Mining · Surface · Underground in hard rock · Underground in soft rock · Recycling · Scrap · Comminution · Stamp mill · Arrastra · Crusher · AG mill.

Variable Speed Applications Rockwell Automation

2016-10-5 · applications that can benefit from the speed and/or torque control offered by l Increases output and performance of SAG mill improved process control and longer lifetime of equipment (more flexibility) soft rock or earth or fragmented hard rock. It could also be used to load the material into the hauling units (trucks) or

What Grinding Mills Can Use Ceramic Grinding Media

2019-12-3 · Stirred Mill: Many Chemshun ceramic grinding media can applied in the grinding mill. Medium density alumina silicate balls CS-26 for milling process of soft materials. And ceramic grinding balls CS-32 and CS-38, size from 0.4mm to 20mm, are suitable for milling process of hard materials. Also, Chemshun supply zirconia beads CS-40 and CS-52.

Grinding media quality assurance for the comminution of

2017-10-20 · achieve savings by conducting quality control tests3. Many intrinsic and extrinsic factors are involved in the optimum selection of grinding media. The intrinsic factors include ore hardness, feed size, product size, pulp density, pulp level, mill size, mill speed and feed rate [4]. Often, the mines have a good grip on these and exercise the

Prof Pontt Collahuasi Sag Mill stilbaai

Santiago Orlando Castro Bravo Gerente y dueño The underground mine arrangement is composed of various caverns and shafts with an approximately 20 km long tunnel system to connect all facilities.The Don Luis Primary Crusher (16 m wide and 32 m long with a maximum height of 44 m) and the SAG Mill cavern (28 m wide and 118 m long with a maximum height of 37 m), are part of this underground