Comparison of Ore Hardness Measurements for …
size F80 of 152 mm to 80% passing 1.7 mm, and a simple adjustment procedure in case the SAG product size needed to be adjusted. Bond rod and ball mill work indices are readily converted to pinion energy for rod and ball mills but not for SAG mills. Reproducibility, while not studied in this paper is clearly a part of the meaningfulness of …
AMIT 135: Lesson 6 Grinding Circuit – Mining Mill …
SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill
SAG Mill Power Model
Prediction of correct sag mill power consumption with a change in ore hardness, solid percent (density) to the sag feed, rpm of sag and PSD has always been very tricky. So …
Choosing a SAG Mill to Achieve Design Performance
A further explanation is required to explain the importance of designing the SAG mill chamber to draw required power at optimum operating conditions of 75% critical …
Design of the 40 foot SAG Mill Installed at the Cadia …
SAG mill and two ball mills in closed circuit with cyclones. Two pebble crushers treat the SAG mill discharge trommel screen oversize material. The crushed product is combined with the SAG mill feed. Project economics dictated maximum throughput through a single line comminution circuit. Hence the selection of some of the largest
PRE-CRUSHING OF SAG FEED: FRIEND OR FOE
enter a ball mill. Indeed, if a SAG mill discharge screen or trommel has 12.7 mm square openings, the top size of material moving forward to the ball mill will be 12 mm and the P …
What's the Difference Between SAG Mill and Ball Mill
The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...
20150806 Survey Sample Grinding Circuits-GMG-ICE …
Grinding (AG), Semi-Autogenous Grinding (SAG), rod, and ball mill circuits operating within the normal range of appli-cation. This guideline does not directly address analysis of crushing plants and fine grinding circuits, but it is a useful reference for such endeavors. Applying power-based analysis techniques requires suf-
SAG Power Index (SPI) Test | Mining | SGS Brazil
It is a measure of the hardness of the ore from a SAG or AG milling perspective. The test is a batch test, run with 2 kg of ore in a standard 10 cm diameter by 30 cm long mill, and it measures the time (in minutes) required to grind a sample from 80% passing 12.5 mm to 80% passing 1.70 mm.
AG
Product Size: All passing 6 mesh with 80% passing 20 mesh. Net power from pilot plant: 16.5 KWH/ST. Mill, gear and pinion friction multiplier: 1.025. Mill Power …
C O N S U L T I N G L T D TECHNICAL MEMORANDUM
EF5BM=[ P80+10.3 1.145×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a "single-stage ball mill" calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies …
Used Sag-mills For Sale
Inventory ID: 6C-GM01. UNUSED FL 36' x 17' (11m x 5m) SAG Mill with 13,500 kW (18355 HP) Wrap Around Drive
Minerals | Free Full-Text | An LSTM Approach for SAG Mill
The LSTM network shows great results on predicting the relative operational hardness at 30 min time support. On SAG mill 1, using a lambda value of 0.5, the obtained accuracy was 77.3% while increasing the lambda to 1.5 led to an increase in accuracy of 93.1%. Similar results were found on the second SAG mill.
Unlock SAG mill capacity with process control optimisation
The methods on how to manage the changing variables around SAG mills have improved over the years with new instrumentation and Advanced Process Control () systems. Despite these improvements, there is a gap between the available technologies and achieving the maximum potential of the SAG mill performance. The gap traditionally …
SAG Mill Grinding Circuit Design
What's the Difference Between SAG Mill and Ball Mill
The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, …
SAG Conference Paper as Submitted
Figure 3 – Discharge end of the 38' SAG mill at Canadian Malartic with feed chute in place Intelligent Bolts The prediction and monitoring of liner wear inside a SAG or Ball mill has traditionally been accomplished and confirmed by a number of different methods, many of which require people to enter the mill.
SAG Mill Optimization using Model Predictive Control …
Control of -SemiAutogenous Grinding(SAG) mill weight is an example of an important process that exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., & Mainza, A.N. 2009).
Optimal Speed Control for a Semi-Autogenous Mill Based on Discrete
In modern mineral processing, semi-autogenous (SAG) mills are important grinding equipment. A SAG mill has the advantages of high operation rate, large output, and large crushing ratio, which makes SAG mills have the characteristics of short process time, low management cost, and suitability for large-scale production compared to other mills.
SAG Mill Optimization using Model Predictive …
Control of -SemiAutogenous Grinding(SAG) mill weight is an example of an important process that exhibits many of these aspects. Maintaining the SAG mill weight at the …
An LSTM Approach for SAG Mill Operational Relative
On SAG mill 1, using a lambda value of 0.5, the obtained accuracy was 77.3% while increasing the lambda to 1.5 led to an increase in accuracy of 93.1%. Similar results were found on the
Numerical prediction of wear in SAG mills based on DEM …
Abstract. Wear is a major operating problem for semi-autogenous grinding (SAG) mills. A credible and efficient numerical approach for accurately predicting wear within SAG mills can significantly reduce design time and improve grinding efficiency. In this paper, the 3D simulations were performed using discrete element method (DEM) combined with ...
Grinding Mill Control
The acoustics of the mill charge motion is measured by a device mounted adjacent to the SAG Mill shell. The resulting signal is transmitted to the acoustic indicating controller which, in turn, sends a remote set point to the SAG mill speed controller. The speed of the SAG mill is then automatically adjusted (within set limits) to maintain the ...
Material Transport Study into a SAG Mill by DEM Impact on …
To study the transport of the material inside the SAG mill, it's been developed a model based only on inner surfaces that enter in contact with the material and milling ways. The Fig. 1 shows a scheme in cut of the mill, where is possible to see the inner surfaces of the mill and the angle α of the lifter inclination in the cylindrical mantle.
Difference Between Sag Mill vs Ball Mill
1. SAG mill is the primary tool for grinding. SAG mill is used before the other mills. Ball mill is a secondary, and it is used after the SAG mill. 2. SAG mill breaks the raw material into pieces for the further grinding. Ball mill is used to grind the pieces of raw material into. powder-like structures. 3.
Structure optimization and application of shell liner of large SAG mill
In combination with a large copper mine in China φ 11.0 m × The actual application of the 5.4m SAG mill barrel liner, the liner structure is improved and optimized to improve the grinding ...
What is SAG Mill Load curve?
To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN; Use Add New Topic to ask a New Question/Discussion about Grinding.; OR Select a Topic that Interests …
A comparison of SAG mill power models
varying it as the mill water addition rate changes. Loveday/Barratt Model Brian Loveday published a simple SAG mill model (Loveday, 1978) of the form in Equation 2. The …
BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
things. It is incorrect to say, for example, "the ball mill work index is 13 kWh/t and the SAG mill SEC is 5 kWh/t, so the total circuit energy is 18 kWh/t." This example is a real discussion that one of the authors had with a flotation engineer who was confused because of the convention of using the same units for both quantities.
Research on Non-Uniform Wear of Liner in SAG Mill
The numerical calculation method is used to analyze the wear of the liner of the general structure of a semi-autogenous mill in the axial direction, and the non-uniform wear of each area of the liner is studied to explore the reasons for said wear. The liner is divided into areas along the axial direction, and the discrete element method (DEM) is …