Rock hardness variations (SAG mill conditions) emitted different acoustic emissions. The immediate acoustic sensing showed that the hard rock produced higher noise intensity …
The filling rate of steel ball in the shell of the semi-autogenous mill is a main item to distinguish SAG mill and autogenous mill. In order to eliminate the impact of the accumulation of rock, the autogenous mill allows to add about 3% of the …
into the operation of a SAG mill has potential to reduce the total energy cost by 27%. Robustness against climate change can be achieved with an increase in total cost of 1%. Finally, use of …
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 below 75 µm to ball
How much rock and balls must you hold in your SAG mill for it to best operate? 911 Metallurgist is a trusted resource for practical insights, solutions, and support in mineral processing engineering, helping industry professionals succeed with proven expertise. | SAG Mill Operating Load : SAG Mill Volumes.
The sizing of a solar photovoltaic plant (PV) with a battery energy storage system (BESS) to feed an energy-hungry process is highly dependent on the solar resource available, which is itself dependent of the geographic location (Deshmukh and Deshmukh, 2008).The Atacama Desert in Chile, in which a high concentration of mineral deposits and mining …
xLoad stability with large rock size and a small mill volume. xPebble extraction rates and discharge designs in the pilot mills. ... The SAG mill model in the JKSimMet software has not been shown to accurately reproduce the performance of a single stage mill for greenfield design. A review of most modern power models shows that the prediction of
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
A SAG (Semi-Autogenous Grinding) mill is a giant rotating cylinder filled with grinding media and the ore being reduced. As the mill rotates, the grinding media lifts and the impact crushes the feed material. SAG mill control refers to the practice of managing the mill load, which is the amount of material inside the mill at any given time.
When the rock shape is non-spherical, since the EDEM software makes contact judgments when the particles are generated, the actual volume of the generated rock particles may account for less than 20%, but the difference is small. ... The change of the variation coefficient of the SAG mill speed with the rock shape during the startup phase is ...
Hard rock is associated with high specific energy consumption, and soft rock, with low specific energy consumption. Keeping the throughput constant, but selecting high or low specific energy consumption blocks for the SAG mill feed allows the energy requirement to be managed, while satisfying the production.
operation of SAG mills. SAG mills are currently the technology of choice in hard rock milling operations for reducing primary-crushed ore to ball mill feed. In recent years, the trend has been towards larger-sized SAG mills with diameters of 10.4 m (34 ft) and above, with the largest being 12.2 m (40 ft) in
If you use very soft rock in a SAG mill it will not work as well as if you use harder rocks. Adjustments to the lifting plates around the circumference of the mill provide greater lift …
The data were obtained from a sag mill circuit that was being fed by a stockpile which was drawing down. The sag mill feed conveyor was fitted with an on-liner sizer using image analysis, whilst the stockpile had an ultra-sonic indicator which tracked its level down to a certain point below which excessive noise made further measurement inaccurate.
Tracking the mill performance showed that the mill power consumption decreased from 9.49 to 6.63 kWh/t (a nearly 30% reduction), P80 of the mill product decreased from 611 to 355μm, and the mill ...
Interestingly dropping the open area to the same as that of SAG mill 1, results in the same calculated SDV as SAG mill 1. Figure 3 Mill discharge and load for the Los Bronces mills The 28ft SAG mill 1 has good discharge, with the slurry flowing out in the circled area on the photograph, and the charge being dry on the surface.
It provides information on rock classification and mineralogy which enhances the knowledge of the mine and answers questions on ... SAG Mill ore hardness kWh/t: Energy required to grind an ore from F80 of 152 mm to T80 of 1.7 mm. It is a resulting value from the SAGDesign test. No other test accurately reports SAG
mill work index 11.4 kWh/t and an average RQD of 44%. RQD values of 25% resulted in a SAG mill feed size (F80) between 55 and 60 mm and throughputs of 6200 t/h. RQD values of 55% resulted in SAG mill feed size (F80) of over 70 mm and a SAG mill throughput of 5200 t/h. The Batu Hijau SAG mill specific energy was a function of point load test and ...
using JK SimMet software. Surveys of the mill SAG during the first couple of months of operation were compared to those predicted. This paper ... rock strength of 150-160 MPa, with some values in excess of 200 MPa and 300 MPa. This indicated a significant variation in ore competency and
In order to obtain the optimal operation parameters of a SAG mill, in this paper, the discrete element method (DEM) is used to simulate the breakage process of the particles by controlling three ...
Prediction of slurry grinding due to media and coarse rock interactions in a 3D pilot SAG mill using a coupled DEM + SPH model. Author links open overlay panel Paul W. Cleary a, Rob D. Morrison ... delivery of post-mix soft drink and multiphase flow of ice and liquid in a Slushie machine) [403], water and particulate mixing in a feed box [404 ...
SAG MILL TESTING - AN OVERVIEW OF THE TEST PROCEDURES AVAILABLE TO CHARACTERIZE ORE GRINDABILITY AUTHOR: F.O. VERRET, G. CHIASSON AND A. MCKEN - SGS ... ore hardness/friability and rock density. TECHNICAL PAPER 2011-08 ABSTRACT Several grindability tests were developed over the years to design grinding circuits or optimize …
The ball-mills in SABC circuits are operated at a relatively high speed (70-78% of critical speed), with large balls (50 mm to 80 mm), to cope with a coarse feed (a transfer size from the SAG mill ...
Obviously, the SAG mill is consuming more and the ball mill less power than was predicted by the empirical method, but the overall total is 99.5% of the predicted total. Examples The Hemlo gold project of Teck-Corona (1000 mtpd) provides an example of mill sizing using the empirical calculation method alone.
energies Article Operation Analysis of a SAG Mill under Different Conditions Based on DEM and Breakage Energy Method Qiyue Xie 1, Caifengyao Zhong 2, Daifei Liu 1,*, Qiang Fu 1, Xiaoli Wang 3 and Zhongli Shen 1 1 School of Electrical & Information Engineering, Changsha University of Science & Technology, Changsha 410114, China; qyxie168@163 (Q.X.); …
With a clear understanding of the mill's current state, LSI's team tackled the complex task of modernizing the controls for the massive mechanical rheostats (which act as a soft-start mechanism for the mill's 3000 hp, 13.8 kV motors), allowing for precise control through a new servo drive system.
A Sag mill is most often used in the mining fields, particularly in the mining of precious metals such as gold, copper, silver, and nickel. The sag mill serves in the line of industrial mining equipment designed to process, crush, separate, or locate precious metals from mined coal. The Sag mill is one of the large mining equipme…See more on baichy
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 …
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 ... The patterns of rock comminution within tumbling mills, as well as the nature of forces, are ...
SAG Mill Throughput (tph) S. Michaux, N. Djordjevic / Minerals Engineering 18 (2005) 439–448 Influence of ore breakage characteristics on SAG mill throughput 2000 y = 28.596x + 673.37 1900 2 R = 0.9968 1800 1700 1600 1500 1400 25 30 35 40 45 Ore Breakage Parameter (A*b) Fig. 10. SAG mill throughput and ore residual strength.
The rapidly developing mining industry poses the urgent problem of increasing the energy efficiency of the operation of basic equipment, such as semi-autogenous grinding (SAG) mills. For this purpose, a large number of studies have been carried out on the establishment of optimal operating parameters of the mill, the development of the design of lifters, the rational …
3.2 Mine-to-Mill The feed size to AG and SAG mill circuits has been demonstrated to have a significant impact on throughput with effects such a that illustrated in Figure 7, being commonplace. Modifying blast design and primary crusher operation can significantly influence AG/SAG mill feed size, hence giving a potentially cost effective way to
SAG mills use a combination of steel balls and rock particles as grinding media. The addition of rock particles to the SAG mill feed allows the mill to break larger rocks, thus increasing the grinding efficiency. However, the use of rock particles can also lead to increased wear of the mill liners and decreased efficiency. AG Mill Grinding Media
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 ...
Due to its strong lifting capacity and excellent grinding performance, the trapezoidal liner is widely used in the SAG mill. The structure of the trapezoidal liner is shown in Fig. 1, the main dimensions are: dip angle (tau), length of the top edge (L) and height (h).Dip angle (tau) determines the trajectory of the mediums in the SAG mill, which directly affects the …
3.2 Mine-to-Mill The feed size to AG and SAG mill circuits has been demonstrated to have a significant impact on throughput with effects such a that illustrated in Figure 7, being …