Customer case aboutsag mill ore hard soft control

sag mill ore hard soft control

SAG Mill Control: It Shouldn’t be that Hard E & MJ

2020-4-8  SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill. The best way to measure load is to mount the mill on load cells. The load cells are calibrated to measure the total weight of water, grinding media (balls) and ore in the mill

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Optimization of a SAG Mill Energy System: Integrating

2019-7-1  This is achieved by using two stockpiles of limited capacity, to classify ore as hard or soft, depending on its expected grindability (Fig. 3). The SAG mill will draw from one of the two stockpiles at will to minimize the energy cost. If one of the stocks is emptied, the ore from the other stockpile is used.

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(PDF) Real-Time Simulation and Control of a SAG Mill

study is a SAG mill open circuit composed of an ore feeder, water control v alve, and mill depicted in Figure 2. The SAG mill model is based on a differential equation. describing the mass

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Model predictive control of semiautogenous mills (sag

2014-10-1  2.4. Multivariable predictive control. In the present work, a three-input-three-output scheme of control was performed. The total water feed to the mill (the feed water flow rate was added to the dilution water flow rate, so they could be specified separately, but for the SAG mill model, the total water content was the variable of interest), the fresh ore feed rate, and the mill rotation speed

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Ore Hardness Testing -SAG Mill Tonnage Estimation Method

2014-12-22  For design purposes, you need an estimation or prediction of your SAG Mill’s tonnage; well, there are 3 ways to generate good rock “ore” hardness testing data for SAG and ball mill circuit grindability from half drill core. We can abbreviate the

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A Neural Network Model for SAG Mill Control SGS

SAG specific power range of about 3 to 9 kWh/t for this site. The design of the ore stockpiling and conveying system contributes to fluctuating size distribution with significant short-term segregation occurring under certain operating situations. Depending on ore type and feed size distribution, each SAG mill will process between 700 and 3000 tph.

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AUTOMATION ADVANCED CONTROL EXPERT (ACE)

• Stabilize Semi-Autogenous Grinding (SAG) mill weight (according to the Set Point (SP) set by the operator) in order to achieve constant grind performance and maximum production rate • Control the fresh ore feed rate and mill speed according to weight control SP •

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Lihir Gold Limited Process Plant Flowsheet Tripod

2001-12-2  Crushed Ore Stockfile SAG Mill Feed Conveyor Radial Stacker Front End Loader Crushed Ore Transfer Conveyor Crusher Discharge Conveyor R.O.M. Stockfile Hard Ore Soft Ore Hard Ore Dump Hopper Front End Loader Carbon Screen Conditioning Tanks Mill Water Pumps 3x To Neutralisation Tank Flotation Tank Cells (5 x) Rougher Tailings Hopper Flot

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Advanced Controller for Grinding Mills: Results from a

2014-2-3  MILL CONTROL: BALL MILL CONTROL EXAMPLE Process Description The copper concentrator in Pinto Valley, Arizona processes a 0.4% grade copper ore from a nearby open pit mine. The unit operations consisting of crushing, grinding, and flotation process about 65,000 tons of ore per day in six overflow ball mills.

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(PDF) Real-Time Simulation and Control of a SAG Mill

study is a SAG mill open circuit composed of an ore feeder, water control v alve, and mill depicted in Figure 2. The SAG mill model is based on a differential equation. describing the mass

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Robust control of a SAG mill ScienceDirect

2002-4-29  Fig. 3 compares the regulatory response of two robust SAG mill controllers to a number of step changes in the disturbance variable F 80.At t=5 h, F 80 was stepped up from 61.5 to 63.3 mm (i.e. the feed particle size distribution was increased), while at t=36 h, F 80 was stepped down from 63.3 to 57.7 mm (i.e. the feed particle size distribution was decreased).

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Model predictive control of semiautogenous mills (sag

2014-10-1  2.4. Multivariable predictive control. In the present work, a three-input-three-output scheme of control was performed. The total water feed to the mill (the feed water flow rate was added to the dilution water flow rate, so they could be specified separately, but for the SAG mill model, the total water content was the variable of interest), the fresh ore feed rate, and the mill rotation speed

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Throughput optimisation in milling circuits

SAG milling can be optimised to achieve maximum breakage and throughput (or any other number of objectives). The relationships between the key variables are highly non-linear and shift as the ore hardness, steel load and liner conditions change. Traditional and basic control and modelling techniques are therefore not veryfective.

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Model Predictive Control of SAG Mills and Flotation

associated with ore feed systems, or the integrating behaviour of flotation cell levels), or multiple interacting variables (such as rotation speed and ore feed rate on SAG mill weight). A more advanced approach to automation that seems to be popular among mineral processors is

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A Neural Network Model for SAG Mill Control SGS

SAG specific power range of about 3 to 9 kWh/t for this site. The design of the ore stockpiling and conveying system contributes to fluctuating size distribution with significant short-term segregation occurring under certain operating situations. Depending on ore type and feed size distribution, each SAG mill will process between 700 and 3000 tph.

get price

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

The efficiency of the mill to break ore is a function of both the feed size distribution and the relative hardness of the ore. When the feed size of a SAG mill becomes coarser, i.e. α r increases

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Lihir Gold Limited Process Plant Flowsheet Tripod

2001-12-2  Crushed Ore Stockfile SAG Mill Feed Conveyor Radial Stacker Front End Loader Crushed Ore Transfer Conveyor Crusher Discharge Conveyor R.O.M. Stockfile Hard Ore Soft Ore Hard Ore Dump Hopper Front End Loader Carbon Screen Conditioning Tanks Mill Water Pumps 3x To Neutralisation Tank Flotation Tank Cells (5 x) Rougher Tailings Hopper Flot

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Gearless Mill Drives ABB

2021-2-17  Antamina Compania Minera Antamina S.A. Peru Project: One SAG Mill and 3 Ball Mill Drive Systems Capacity: SAG Mill 1000 t/h Ball Mills 1000 t/h Consultant: Bechtel, USA Mill Builder: FFE Minerals, USA Mill Size: SAG Mill 38 feet/11,58 m Ball Mills 24 feet/7,32 m Ore processed: Copper/Zinc Drive Rating: SAG Mill 20,1 MW, 9,23 rpm Ball Mills 11,2 MW, 11,38 rpm

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Grinding control strategy on the conventional milling

2009-8-27  the control loop will attempt to add water to Cyclone 1 sump to achieve a particle size of 15%+ 300 µm. If the hardness of the ore increases, the particle size in the mill discharge from ball mill 1 will increase. With the same water addition to sump 1 the particle size of Cyclone 1 overflow will increase. This will decrease the ratio, and hence

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(PDF) Real-Time Simulation and Control of a SAG Mill

study is a SAG mill open circuit composed of an ore feeder, water control v alve, and mill depicted in Figure 2. The SAG mill model is based on a differential equation. describing the mass

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SAG Mill Autogenous and Semi-Autogenous Mills

Rely on our proven track record of AG and SAG Mill superiority. Since the early 1980s, we have been designing and manufacturing Semi Autogenous Mill (SAG Mill) and Autogenous Mill (AG Mill) under the Fuller-Traylor brand. Semi-autogenous grinding uses a minimal ball charge in the range of 6-15% while autogenous grinding uses ore

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Model predictive control of semiautogenous mills (sag

2014-10-1  2.4. Multivariable predictive control. In the present work, a three-input-three-output scheme of control was performed. The total water feed to the mill (the feed water flow rate was added to the dilution water flow rate, so they could be specified separately, but for the SAG mill model, the total water content was the variable of interest), the fresh ore feed rate, and the mill rotation speed

get price

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

The efficiency of the mill to break ore is a function of both the feed size distribution and the relative hardness of the ore. When the feed size of a SAG mill becomes coarser, i.e. α r increases

get price

Gearless Mill Drives ABB

2021-2-17  Antamina Compania Minera Antamina S.A. Peru Project: One SAG Mill and 3 Ball Mill Drive Systems Capacity: SAG Mill 1000 t/h Ball Mills 1000 t/h Consultant: Bechtel, USA Mill Builder: FFE Minerals, USA Mill Size: SAG Mill 38 feet/11,58 m Ball Mills 24 feet/7,32 m Ore processed: Copper/Zinc Drive Rating: SAG Mill 20,1 MW, 9,23 rpm Ball Mills 11,2 MW, 11,38 rpm

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The SAG Power index also known as the Starkey SAG Test

2021-8-25  The SAG Power index also known as the Starkey SAG Test, also known as the SAG Grindability Index Test Procemin 2013 In this paper, the authors undertake a critical review of the Starkey test and the publicly available infor- mation related to the test equipment, procedures, and scale-up

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A Method of C alculating Autogenous/ Semi

2018-2-20  SAG mills mimic the same shortcoming. It follows that in order to obtain the specifi c energy (SE) to achieve a certain transfer size, based on the 80 per cent passing value, an ineffi ciency factor must be applied to the SE of single stage ball mills, rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method.

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Comminution testing JKTech University of Queensland

2020-7-30  The Integrated JK Drop Weight Test provides ore specific comminution parameters that are used in the JKSimMet software to analyse and/or predict crusher and AG/SAG mill performance. This allows for optimisation of current circuits or flowsheet design for new circuits. Developed at JKTech, the Integrated JK Drop Weight & SMC Test is a single

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Toromocho A giant in high-altitude mining

2021-2-16  The three gearless mill drive (GMD) systems are the ABB most powerful ever made. The GMD for the 40-foot SAG mill has a power rating of 28 megawatts (MW), and the GMDs for the two 28-foot ball mills have a power rating of 22 MW. They are the largest diameter and most powerful SAG and ball mills drive systems at the highest altitude installed to

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Control Valves Experitec

Emergency Support and Service M-F 7:30 am 5:00 pm: 888-268-6437 After Hours: 888-268-6437

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