# overloading a sag mill

...### Overload Detection in Semi-Autogenous Grinding: A

Jan 01, 2015· Abstract Detecting the onset of overloading in a semi-autogenous grinding (SAG) mill is a challenging task for operators to perform due to the complex and nonlinear nature of an overload. To detect an overload, operators must simultaneously monitor the correlations between several measurements of the SAG process.

Ask for price### Grinding Circuit Overload Grinding & Classification

Another common issue with SAG mills is operating at very low density (e.g. <70% solids) if there is room to increase SAG density, this will enable the SAG to grind finer with little or no decrease in throughput. Consider reducing the feed rate when the overload starts rather than waiting until a grind-out becomes necessary.

Ask for price### Overloading A Sag Mill greenrevolution

Choosing a SAG Mill To Achieve Design Performance190 Кб. SAG mill to over 26% by volume. Using this information, the detriment to throughput, expressed as a % of maximum throughput can be calculated.In fact the only way to provide extra useable power for a SAG mill is to increase the size of the grinding chamber because overloading the mill may draw more...

Ask for price### SAG Mill Grinding Circuit Design

Jun 06, 2016· SAG Mill Design and Specification . the late commissioning of much of the instrumentation and an eagerness to maximise mill throughput led to frequent mill overloading during the first four months of operation. The natural operator over-reaction to overloads resulted numerous mill grindouts, about sixteen hours in total, which in turn were

Ask for price### overloading in autogenous mills 」

overloading a sag mill. overloading a sag mill Electrical circuits are designed to handle a limited amount of electricity. An overload occurs when you draw more electricity than a circuit can safely handle. Circuits are made up of wiring, a breaker or a fuse, in old wiring systems, and devices such as light fixtures, appliances, and anything

Ask for price### SAG Mill Optimization using Model Predictive Control

& Mainza, A.N. 2009). However, SAG mill weight is difficult to control as the dynamic response changes as the mill approaches maximum capacity. Near maximum capacity, the weight response exhibits integrating behavior, and the mill can overload quickly. This situation is complicated by the transport

Ask for price### The effect of overloading and premature centrifuging on

scale mill. During these programmes overloading and premature centrifuging of the load were detected. These phenomena are described in this paper. Their effect on mill power is described and modelled. The mill and probes A fully autogenous run-of-mine mill at the Kinross Gold Mine, South Africa, was used for the experimental work. The mill (4.027 m

Ask for price### What's the Difference Between SAG Mill and Ball Mill

Nov 26, 2019· SAG mill is usually used to grind large pieces into small pieces, especially for the pre-processing of grinding circuits, thus also known as primary stage grinding machine. ensure safe start, avoid overloading of the air clutch, and play a protective role. The slow-speed transmission device can realize the point-to-point reverse in the

Ask for price### Using Fuzzy Control to Optimize SAG Mill Production

Sag Mill Example To illustrate the power of fuzzy logic we will next look at its application in controlling a typical sag mill circuit as is shown in Figure 2. Figure 2. Typical Sag Mill Configuration as Defined in KnowledgeScape. An example of controlling SAG mill speed will be

Ask for price### Overload Detection in Semi-Autogenous Grinding: A

Detecting the onset of overloading in a semi-autogenous grinding (SAG) mill is a challenging task for operators to perform due to the complex and nonlinear nature of an overload. To detect an overload, operators must simultaneously monitor the correlations between several measurements of the SAG

Ask for price### SAG Mill Optimization using Model Predictive Control

& Mainza, A.N. 2009). However, SAG mill weight is difficult to control as the dynamic response changes as the mill approaches maximum capacity. Near maximum capacity, the weight response exhibits integrating behavior, and the mill can overload quickly. This situation is complicated by the transport

Ask for price### Choosing the Right Motors for your Mills

Step 1: Mill overload power •Determine a set of operating conditions that reflects the maximum “overloaded” condition that the mill should be able to handle: –SAG mills: 20% v/v ball charge, 30% v/v filling and 78% critical speed with worn liners –Ball mills:

Ask for price### Grinding of Agrium Phosphate Ores in a 3’ Diameter Pilot

Jan 10, 2021· The SAG mill was also found to be running at less than 50% of critical speed and physical Operating conditions were erratic due to the combination of ore changes and overloading in the SAG mill that causes the speed to automatically reduce at about 1700 HP draw, well above the Page 2.

Ask for price### Process control challenges and opportunities in mineral

Aug 14, 2015· The best way to illustrate this principal is with a classic overload in a SAG mill. In this case, the load in the mill hits a point where the center of gravity in the mill shifts. The momentum of the material in the mill drives the rotation and the motor no longer needs to work to spin the mill. This is referred to as "freewheeling."

Ask for price### Using Fuzzy Control to Optimize SAG Mill Production

Sag Mill Example To illustrate the power of fuzzy logic we will next look at its application in controlling a typical sag mill circuit as is shown in Figure 2. Figure 2. Typical Sag Mill Configuration as Defined in KnowledgeScape. An example of controlling SAG mill speed will be

Ask for price### Process optimization using real time tracking of coarse

Jun 01, 2015· Rio Tinto Kennecott’s concentrator is a SAG mill, ball mill and pebble crushing (SABC) circuit with four grinding lines to treat an average throughput of approximately 168 kt/d. Wemco mechanically historic excursions of under loading and overloading of the

Ask for price### Difference Between Sag Mill vs Ball Mill mech4study

Oct 12, 2017· 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 filled with balls partially.

Ask for price### Done Magmatic Generator is overloaded MineYourMind

Apr 05, 2017· GridPower, GP for short, is an interesting feature. If you have not started building any, you need to look at the recipe for the Manual Mill, It will kick start your race to build up your GP. Ultimately, like many of us, you will likely find yourself using a star pattern array of Water Mills.

Ask for price### SAG Mill Control Instability: Causes and Solutions CEEC

SAG Mill Control Instability: Causes and Solutions. Oscillatory unstable behaviour in a SAG mill is characterised by the mill constantly cycling between an overload condition and recovery from that condition by a substantial reduction in feed rate tonnes. Such behaviour is commonplace with SAG mills and gives rise to a significant overall

Ask for price### TITLE: Keys To Best Practice Comminution

Best practice comminution means running a SAG mill at its best conditions, and avoiding overloading, overspeeding and using excessive steel additions, during the design and operating stages of plant setup. When normal limits for these parameters are exceeded in the design stage, production shortfalls result

Ask for price### MillSense mill charge sensor system Metso Outotec

The mill charge volume has a great impact on grinding efficiency. For efficient grinding, autogenous (AG) and semi-autogenous (SAG) mills need to be operated with the correct charge in order to maximize their throughput while avoiding overloading. The Outotec MillSense sensor system gives a precise indication of the mill charge volume.

Ask for price### Choosing the Right Motors for your Mills

Step 1: Mill overload power •Determine a set of operating conditions that reflects the maximum “overloaded” condition that the mill should be able to handle: –SAG mills: 20% v/v ball charge, 30% v/v filling and 78% critical speed with worn liners –Ball mills:

Ask for price### TITLE: Keys To Best Practice Comminution

Best practice comminution means running a SAG mill at its best conditions, and avoiding overloading, overspeeding and using excessive steel additions, during the design and operating stages of plant setup. When normal limits for these parameters are exceeded in the design stage, production shortfalls result

Ask for price### Process control challenges and opportunities in mineral

Aug 14, 2015· The best way to illustrate this principal is with a classic overload in a SAG mill. In this case, the load in the mill hits a point where the center of gravity in the mill shifts. The momentum of the material in the mill drives the rotation and the motor no longer needs to work to spin the mill. This is referred to as "freewheeling."

Ask for price### MEI's Barry Wills: Keys to Best Practice Comminution

Feb 15, 2021· Best practice comminution means running a SAG mill at its best conditions, and avoiding overloading, overspeeding and using excessive steel additions, during the design and operating stages of plant setup. When normal limits for these parameters are exceeded in the design stage, production shortfalls result and operating costs are high.

Ask for price### Using Fuzzy Control to Optimize SAG Mill Production

Sag Mill Example To illustrate the power of fuzzy logic we will next look at its application in controlling a typical sag mill circuit as is shown in Figure 2. Figure 2. Typical Sag Mill Configuration as Defined in KnowledgeScape. An example of controlling SAG mill speed will be

Ask for price### Optimization of mill performance by using

overloading the mill is an additional factor. A direct measurement of the ball level in the mill, more accurate than power readings, as well as a control of it, is therefore highly important. Load angle as an indicator of milling efficiency? Toe and shoulder angles of

Ask for price### Process optimization using real time tracking of coarse

Jun 01, 2015· Rio Tinto Kennecott’s concentrator is a SAG mill, ball mill and pebble crushing (SABC) circuit with four grinding lines to treat an average throughput of approximately 168 kt/d. Wemco mechanically historic excursions of under loading and overloading of the

Ask for price### MillSense mill charge sensor system Metso Outotec

The mill charge volume has a great impact on grinding efficiency. For efficient grinding, autogenous (AG) and semi-autogenous (SAG) mills need to be operated with the correct charge in order to maximize their throughput while avoiding overloading. The Outotec MillSense sensor system gives a precise indication of the mill charge volume.

Ask for price### SmartMill Grinding ABB

Combine ABB's variable-speed drive system with advanced process control ABB Ability™ Expert Optimizer for grinding to provide maximum mill control. It can be applied to new or existing AG, SAG and ball mills, powered by either ring-geared mill drives (RMD) or gearless mill drives (GMD).

Ask for price### Minding the Grind: Maintenance Options to Keep SAG Mills

Given the impact that SAG mill performance has on overall plant performance, operators also have to pay attention to the design and construction of ancillary equipment, such as trommels, to avoid stoppages or loss of throughput from breakage, unexpected wear or loss of processing capacity. but rather mill abuse, mill overload or wash. An

Ask for price### (PDF) SINGLE STAGE SAG/AG MILLING DESIGN SINGLE STAGE SAG

The mill is overloading, retaining fines (or the grates are pegged). 6Decrease the water addition ratio on the SAG mill feed. The fines are being flushed from the mill.One or two of the master mill trend pages should be monitored at all times when operating a single stage mill treating ore of variable competency.

Ask for price### MEI's Barry Wills: February 2021

Feb 27, 2021· Best practice comminution means running a SAG mill at its best conditions, and avoiding overloading, overspeeding and using excessive steel additions, during the design and operating stages of plant setup. When normal limits for these parameters are exceeded in the design stage, production shortfalls result and operating costs are high.

Ask for price### 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.

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