+86 0371 8654 9132

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.

Read More
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.

Read More
Ore Hardness Testing -SAG Mill Tonnage Estimation

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

Read More
AUTOMATION ADVANCED CONTROL SOLUTIONS FOR

SAG mill control schematic responsive, precise control is possible. BrainWave accounts for changes in mill rotation, recycled pebbles and ore quality, to maintain mill weight and maximize production. As the weight controller adjusts the set point for fresh ore feed, a second BrainWave controller adjusts

Read More
Model Predictive Control - Rockwell Automation

2021-3-31  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. The solution automatically controls ore master feed rate and water addition to increase throughput, while keeping mill load within

Read More
Multi-component AG/SAG mill model - ScienceDirect

2013-4-1  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 performance remains quite limited. In an effort to quantify these effects for modelling purposes, a series of laboratory, pilot scale and full scale tests, using multi-component feeds were conducted under the AMIRA P9O project.

Read More
SINGLE STAGE SAG/AG MILLING DESIGN - Orway

2014-10-1  SAG mill (4% ball charge, 90% Nc) A cross between AG and SAG for average competency, abrasive ores. Typically operated in RSA on Witwatersrand Gold Ore Driefontein (Underground), Kloof, Jacobina 6 SAG mill with recycle crusher (8 – 15% ball charge) Competent ores, better suited to coarse grind sizes. High aspect mills are recommended to ...

Read More
Small-Scale Continuous SAG Testing Using the

allow for soft and/or dense ores. The mill is fed from a hopper by a Syntron feeder actuated automatically by a Milltronics control system. This control system continuously regulates the feed rate by maintaining a pre-set sound level with a microphone located underneath the mill shell, controlling the mill level to 25% charge by volume. The

Read More
Lihir Gold Limited Process Plant Flowsheet

2001-12-2  Ball Mill SAG Mill Cyclone Pump CCD # 1 CCD # 2 To Neutralization Mill Water To Grinding Overflow Tank Safety Neutralization Screen Tank Cyanidation Tank CIL Tanks Pre-Neutralization Tank Milk of Lime Mill Water NaCN Barren Solution Acid Wash Tanks (2x) Loaded Carbon Elution Column Pre-Soak Solution Tank Steam Steam Pregnant Solution Tank Strip Water Tank Kiln Feed Hopper

Read More
Grinding Circuit Design for Adanac Moly

hard ore is restricting throughput to a minimum and others when the ore is soft and throughput is allowed to reach a maximum determined by limitations in material handling equipment or other parts of the plant. The larger the variability that is allowed, the less influence the hardest blocks of ore will have on the design and the smaller and

Read More
THE VALUE OF DAILY HIT ORE HARDNESS TESTING OF

2019-11-28  Meadowbank has a two-stage grinding mill circuit (open circuit SAG + closed circuit ball mill), fed with secondary crushed ore from the mine with a F 80 size of around 25 mm. The throughput capacity of the Meadowbank grinding circuit is 445 to 515 tonnes per hour (t/h) depending on ore type, at a final grind size P 80 of 75 to 110 microns (µm).

Read More
(PDF) SINGLE STAGE SAG/AG MILLING DESIGN

St Ives Gold MineSimilar to Tarkwa, the St Ives project had extremely variable ore, however in this case, the ore was extremely hard (Axb = 25). The target grind size for the project was P 80 125 µm. A high aspect 36ft Ø x 18ft EGL, 13 MW SAG mill with recycle crusher was selected for the single stage SAG mill configuration.

Read More
Online SAG Mill Pluse Measurement and Optimization ...

2007-6-30  @article{osti_969329, title = {Online SAG Mill Pluse Measurement and Optimization}, author = {Rajamani, Raj and Delgadillo, Jose and Duriseti, Vishal}, abstractNote = {The grinding efficiency of semi autogenous milling or ball milling depends on the tumbling motion of the total charge within the mill. Utilization of this tumbling motion for efficient breakage of particles depends on the ...

Read More
SAG-MILL Ball charge - Grinding Classification

2021-6-11  SAG-MILL Ball charge (1 reply and 2 comments) ... I am a new in an iron ore plant were we are with magnetite ore using two Aerofall Mills but it's very hard for us to control the the mill feed rate, and we also have a problem with the Ball charge; we've tried different charges but it's still a problem; I would like to know if there's is any way ...

Read More
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.

Read More
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

Read More
JKTech Technical Article

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,

Read More
Major Mines Projects Paddington Mine

Three variable speed feeders draw ore from the base of the stockpile, with the choice of having hard, medium and soft ore from each of the feeders to make an appropriate blend for the SAG mill. Grinding Ore and quick lime added to the ore conveyor is fed to the SAG mill at a rate of 350 tph to 480 tph. The SAG mill (Morgardshammer, 8.0 m x 3.95 ...

Read More
Major Mines Projects Boto Project

Process water will be added to the SAG mill feed chute, to control the pulp density in the mill. The SAG mill will be fitted with discharge grates, which will allow slurry to pass through the mill and will relieve the mill of pebble build-up. The SAG mill product will discharge to a trommel screen for size classification.

Read More
Editor Laura White, laura.whiteoutotec 1 OUTOTEC ...

2018-5-29  it is mandatory that the mill be started using a procedure that minimises the probability of a locked charge start. This procedure is detailed later in the article. 5. Hard start of mill motor, throwing ball charge. Most mills are designed with a soft starter arrangement; a typical mill starter system could include a Liquid Resistor Soft Starter

Read More
Mining - spartancontrols

Increase SAG mill throughput capacity by up to 8%, reduce specific energy, and minimize risk of trip/failure with dynamic load optimization. Option to optimize feed system for further improvements in consistency of operation and management of feed inventory.

Read More
Controlling fragmentation - Orica Mining Services

2012-8-28  SAG mills is less than 5%. To give some context, an example metal mine might spend $5.00/t of ore on electricity; an equivalent amount on grinding media in the SAG circuit alone; but only $0.30/t of broken ore on explosives at the drill and blast stage. Yet, the blasting process is a much more energy efficient method of fragmenting rock.

Read More
(PDF) SINGLE STAGE SAG/AG MILLING DESIGN

St Ives Gold MineSimilar to Tarkwa, the St Ives project had extremely variable ore, however in this case, the ore was extremely hard (Axb = 25). The target grind size for the project was P 80 125 µm. A high aspect 36ft Ø x 18ft EGL, 13 MW SAG mill with recycle crusher was selected for the single stage SAG mill configuration.

Read More
JKTech Technical Article

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,

Read More
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

Read More
Major Mines Projects Boto Project

Process water will be added to the SAG mill feed chute, to control the pulp density in the mill. The SAG mill will be fitted with discharge grates, which will allow slurry to pass through the mill and will relieve the mill of pebble build-up. The SAG mill product will discharge to a trommel screen for size classification.

Read More
Detection and identification of ore grindability in a ...

2017-2-5  with ores from different mine sectors and also the ore is mixed in ore pass, stock piles, and so on. To overcome this problem it is better to identify on-line the grindability of the ore in the mill, so it can be correlated with the different ore types fed to the plant and with the mill throughput. A supervisory control system may be then designed

Read More
Operating comminution circuits without grinding

1) Feeding the right blend of coarse, fine, hard and soft rocks 2) Determining the optimal mill operating conditions to break the rocks effectively 3) Modifying control strategies where needed. Longer-term, mill internals can be adjusted to optimise performance under the new AG milling configuration.

Read More
Editor Laura White, laura.whiteoutotec 1 OUTOTEC ...

2018-5-29  it is mandatory that the mill be started using a procedure that minimises the probability of a locked charge start. This procedure is detailed later in the article. 5. Hard start of mill motor, throwing ball charge. Most mills are designed with a soft starter arrangement; a typical mill starter system could include a Liquid Resistor Soft Starter

Read More
Comminution circuit design and simulation for the ...

DOI: 10.14288/1.0071477 Corpus ID: 138410374. Comminution circuit design and simulation for the development of a novel high pressure grinding roll circuit @inproceedings{Rosario2010ComminutionCD, title={Comminution circuit design and simulation for the development of a novel high pressure grinding roll circuit}, author={P. Rosario}, year={2010} }

Read More