### Increase throughput and capacity in SAG mills

Optimising the capacity of your SAG mill is crucial to avoiding downtime and liner wear and damage. With variances in mill ore feed rate mill speed and slurry density critical impacts can occur in your SAG mill. mill weight and bearing pressure. It can then automatically take corrective action if needed and adjust parameters such as the SAG is an acronym for semiautogenous grinding. SAG mills are autogenous mills that also 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 in diameter powered by a 28 MW (38 000 HP) motor.

### sag mill power estimation espa ol

SAG is an acronym for semiautogenous grinding. SAG mills are autogenous mills that also 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 in diameter powered by a 28 MW (38 000 HP) motor. Optimising the capacity of your SAG mill is crucial to avoiding downtime and liner wear and damage. With variances in mill ore feed rate mill speed and slurry density critical impacts can occur in your SAG mill. mill weight and bearing pressure. It can then automatically take corrective action if needed and adjust parameters such as the

### Hydrostatic and Hydrodynamic Bearings Selection Guide

Chart credit Rotolab Hydrodynamic Bearing . In hydrodynamic bearings the gap is generated dynamically by the bearing motion. Hydrodynamic bearings are used in rotary applications and may require external pressure on one of the bearing pads or a secondary bearing to avoid excess friction when starting rotation. discharge bearing pressure in a sag mill south african sag mill on soft ore job safey analysis of sag mill power based sag mill design calculations sag mill discharge screens moredent grinding ball mill useed crusher bearing Hatch has awarded Joest an order to build am xm double-deck SAG mill discharge screen for the Thompson Creek Mining

### Using LSTM and GRU to predict SAG mill energy

A dataset corresponding to actual operational data of a SAG mill is available with data points every 30 minutes for a total time of 340 days. At each time t n the dataset contains • Feed tonnage (FT) ton/h • Energy consumption (EC) kWh • Bearing pressure (BPr) psi • Spindle speed (SSp) rpm is the SAG Mill 1 Bearing pressure (described later in Figure 3). These fuzzy belief values are used as inputs to 80 rules which describe the knowledge of the mill s control strategy. In addition to the attributes used by the expert system the neural network also uses real

### Toe angle measurement for SAG mill control at Lihir gold

SAG Mill process control classically maintains the SAG mill volumetric filling within a set operating range. Typically a SAG mill weight measurement by either bearing pressure transducers or load cells is used as an inferred measurement of volumetric filling. To maintain volumetric filling within a set operating range the SAG weight setpoint Oct 01 2018 · Increasing the bearing pressure led to increase the mill speed in order to increase breakage and discharge rate. After some time as the bearing pressure was increasing continuously mill feed rate decreased and water flow rate adjusts itself with the feed rate in order to keep SAG mill load solid percent within acceptable limits.

### slide shoe bearing sag millME Mining Machinery

slide shoe bearing sag mill Sliding shoe bearing technology solutions to transform the. Sliding shoe bearing technology solutions to transform the mill Rolling mill With the large-scale large-diameter cement grinding mill equipment more than 3.8m in diameter tube mills are using sliding shoe bearing technology the sliding shoe bearing alloy buses bearing large because the contact surfaces decided to make SAG control one of its priorities in order to further increase throughput and improve stability. The original primary mill control logic delivered by the Optimisation Project in 2005 consisted of a simple PID loop controlling the mill charge (bearing pressure) through feed rate changes.

### Paper # 25Copper Mountain Overview on the Grinding

SAG mill ball mill ring gear dual pinion drive systems variable speed Bearing lubrication type Hydrostatic dual pocket SAG mill (or in some concentrators high pressure grinding rolls) then indeed no variable speed will be required for the ball mills. But the world is not always perfect and therefore it could be very beneficial to Fig.3-Effect ofthe dynamic angle ofrepose ofthe mill load on bearing pressures for load bulk densities of2 0 and 6 0 tjm" Bearing-pressure sensitivity Parameters varied andconditions Definition ofbearing-pressure for bearings No. observed inthe simulation Fig. sensitivity FL FT DL DT

### power based sag mill design calculations

discharge bearing pressure in a sag mill south african sag mill on soft ore job safey analysis of sag mill power based sag mill design calculations sag mill discharge screens moredent grinding ball mill useed crusher bearing Hatch has awarded Joest an order to build am xm double-deck SAG mill discharge screen for the Thompson Creek Mining Jan 13 2014 · Parts of Ball Mill to be lubricated Trunnion bearing Feed end Gearbox Trunnion bearing Dis. end Pinion Fig.2 Ball Mill diagram. Motor 21. Gathered Data This were the alarm gathered during my stay in the Mill. MILL ALARM DATE Diff. High Pressure Trunnion Feed End April 20 2013 SAG Bearing Recirculation Oil Inlet Temp.

### A Neural Network Model for SAG Mill Control

is the SAG Mill 1 Bearing pressure (described later in Figure 3). These fuzzy belief values are used as inputs to 80 rules which describe the knowledge of the mill s control strategy. In addition to the attributes used by the expert system the neural network also uses real Semi Autogenous Design Factors

### The Science of Comminution

- SAG Mill Load Control 28Mill Power Indication 28Cyclone Pressure 28SAG Mill Speed Control 28Pebble CrusherSteel Removal Logic 28 the leading edge of the pa by the low pressure oil feed. The bearing pad is self aligning due to hydrostatic lubrication of the ball and socket support. Initial alignment during erection is slide shoe bearing sag mill . Second Hand Concrete Batching Plants For Sale In Malaysia. Market of Second Hand Concrete Batching Plants For Sale In MalaysiaDevelopment of Second Hand Concrete Batching Plants are to large-scale automated intelligen. Raw Complex Gold Ore Processing Machine.

### SAG and AG MillAmstar Corporation

Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased the SAG Mill can feed downstream ball milling to boost capacity. Amstar SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28 000 kW. A high pressure start-up lubrication system shown generally at 16 is attached to one side of the mill bearing support structure and operates to deliver high pressure oil to the underside of the trunnionin bearing 12 at start-up.

### A Neural Network Model for SAG Mill Control

is the SAG Mill 1 Bearing pressure (described later in Figure 3). These fuzzy belief values are used as inputs to 80 rules which describe the knowledge of the mill s control strategy. In addition to the attributes used by the expert system the neural network also uses real decided to make SAG control one of its priorities in order to further increase throughput and improve stability. The original primary mill control logic delivered by the Optimisation Project in 2005 consisted of a simple PID loop controlling the mill charge (bearing pressure) through feed rate changes.

### SAG Mill Control It Shouldn t be that Hard E MJ

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. Oct 01 2018 · Increasing the bearing pressure led to increase the mill speed in order to increase breakage and discharge rate. After some time as the bearing pressure was increasing continuously mill feed rate decreased and water flow rate adjusts itself with the feed rate in order to keep SAG mill load solid percent within acceptable limits.

### Performance enhancement tools for grinding mills

Figure 12 is a plot of the mill speed and bearing pressure for each point of the high tonnage data set. It may be seen that these points populate over high speed and high bearing pressure signalling a Impact level as a function of speed and bearing pressure †SAG analyser patent pending in Australia Canada Chile South Africa and USA. At our mine we have an issue with vibration at the Sag Motor NDE bearing. The bearing is a journal white metal bearing. The motor has been running for about 14 months now. The vibration at the NDE bearing was around 2mm/sec. In the last month it has climbed to 4.5mm sec with the dominate frequency 1x RPM.

### Evolution of SAG Mill Process Control at the Xstrata

decided to make SAG control one of its priorities in order to further increase throughput and improve stability. The original primary mill control logic delivered by the Optimisation Project in 2005 consisted of a simple PID loop controlling the mill charge (bearing pressure) through feed rate changes. Fig.3-Effect ofthe dynamic angle ofrepose ofthe mill load on bearing pressures for load bulk densities of2 0 and 6 0 tjm" Bearing-pressure sensitivity Parameters varied andconditions Definition ofbearing-pressure for bearings No. observed inthe simulation Fig. sensitivity FL FT DL DT

### OPTIMAL SAG MILL CONTROL USING VIBRATION DIGITAL

Figure 5 illustrates a trend taken from a SAG mill running under expert system control using bearing pressure as the primary control variable. In this trend we can observe that the feed is being held constant while the mill speed is being used to reduce the amount of material in the mill with respect to the current bearing pressure reading. The While many mills today are mounted on load cells others employ bearing oil pressure as a proxy measurement of mill load. A control strategy recently implemented on a large variable-speed SAG mill at MMG s Century Zinc operation in Australia is shown in the chart (found on pg. 32).

### Vibration Sag Mill Motor NDE Bearing AMP Maintenance Forums

At our mine we have an issue with vibration at the Sag Motor NDE bearing. The bearing is a journal white metal bearing. The motor has been running for about 14 months now. The vibration at the NDE bearing was around 2mm/sec. In the last month it has climbed to 4.5mm sec with the dominate frequency 1x RPM. SAG Mill Control It Shouldn t be While many mills today are mounted on load cells others employ bearing oil pressure as a proxy measurement of mill load. Schematic illustration of a control strategy recently implemented on a large variable-speed SAG mill at MMG s Century Zinc operation in Australia.

### SAG and AG MillAmstar Corporation

Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased the SAG Mill can feed downstream ball milling to boost capacity. Amstar SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28 000 kW. At the Lihir Gold Mine the concentrator plant was utilizing SAG mill s bearing pressure to calculate load measurement for their mill. Following a series of SAG mill overload events that caused significant milling downtime the mill operators and metallurgists lost confidence in the repeatability and accuracy of the load measurements.

### MILLING CONTROL OPTIMISATIONMintek

Figures 8 and 9 on the right show results from a gold plant s SAG mill achieved with MillStar s Segregated Ore Feed Controller combined with the Power Optimiser • The standard deviation of the mill feed control is greatly reduced. • The cyclone feed is more stable allowing for consistent size separation and feed to downstream processes. arrangements and special bearing arrangements. Outotec SAG and ball mill Outotec high-performance grinding mills use advanced simulation tools for the best possible process efficiency mechanical reliability and maintainability. Our mill range covers comminution applications.

### SAG Mill Control It Shouldnt be that Hard

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. At our mine we have an issue with vibration at the Sag Motor NDE bearing. The bearing is a journal white metal bearing. The motor has been running for about 14 months now. The vibration at the NDE bearing was around 2mm/sec. In the last month it has climbed to 4.5mm sec with the dominate frequency 1x RPM.