ball filling percentage for sag mill

What's the Difference Between SAG Mill and Ball

Nov 26, 2019· SAG mills grinding media includes some large and hard rocks, filled rate of 9% 20%. SAG mill grind ores through impact, attrition, abrasion forces. In practice, for a given ore and equal processing conditions, the AG milling has a finer grind than SAG mills.

PARAMETER OPTIMIZATION OF LARGE SAG MILL LINER BASED

Jun 17, 2021· 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 impact speed and

OnLine Sensors for measuring the total Ball and charge

respectively. The mill was configured to operate as a RoM ball mill. The experiments were conducted at varying mill speeds (75%85% critical speed), feed rate (12002800kg/hr) and ball loads (1526%). The static mill filling was determined from physical measurements after crash stopping the mill.

Study on Preparation and Characterization of Graphene

As the rotation speed of the highspeed vibrating ball mill was not adjustable, the factory default setting of 1200 r/min was used. It is generally believed that the ball mill has good grinding efficiency when the interstitial filling fraction of the material is 0.61.2 [49, 50]. The parameter setting of

A method to determine the ball filling, in Miduk copper

However, these are just for obtaining to ball filling variation in the mill. The results obtained from this work show, the ball filling percentage variation is between 1.2 3.7% which is lower than mill ball filling percentage, according to the designed conditions (15%). In addition, acquired load samplings result for mill ball filling was 1.3%.

Improved Relationships for Discharge in SAG/AG Mills

filling in the mill and not related to total mill filling. Discharge through an individual opening on the grate is driven by the factors of ore filling, radial position and the size of the aperture. The results indicate that 1.18 mm is approximately the size below which particles

SAGMILLING.COM .. Mill Critical Speed Determination

The "Critical Speed" for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shell's inside surface. This is the rotational speed where balls will not fall away from the mill's shell. Result #1 This mill would need to spin at RPM to be at 100% critical speed. Result #2 This mill's

Optimisation of a SAG mill though trajectory and power

In this study the performance of a fixed speed SAG mill was assessed and optimised by employing mill trajectory models and using the JKMRC power model to calculate percent total mill filling. Power Curves, which correlate ball filling, mill filling and mill power, were also developed. The Power Curves, with additional knowledge from the

Calculate Ball Mill Grinding Capacity

Oct 15, · C) This value represents the Volumetric Fractional Filling of the Voids in between the balls by the retained slurry in the mill charge. As defined, this value should never exceed 100%, but in some cases particularly in Grate Discharge Mills it could be lower than 100%.

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OSTI.GOV Technical Report Improving Energy Efficiency Via

Jul 21, 2006· Depending on the mill size the SAG mills draws between 2 MW and 17 MW. The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical g or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size.

Difference Between Sag Mill vs Ball Mill mech4study

Oct 12, · Ball mill is a fine grinder. A horizontal or vertical rotating cylinder which is filled partially with the balls of ceramics, small rocks and balls made from stainless steel. The ball charge of a SAG mill is about 29% to 30%. By friction and influence of tumbling balls inside rotating cylinder grinds the raw material to the required fineness.

New Method for Controlling the Volumetric Filling

Jan 01, 1991· The main difficulties in this method were that the dependence between mill filling and the amplitude is unlinear and that the dependence also is individual for each mill.The method developed during 198990 is also based on the power oscillation but on its phase shift. In principle level of the material in a mill is measured.

Mill Filling Prediction tool addresses productivity

Apr 02, · Mill Filling Tool Dashboard. The new Mill Filling Prediction (MFP) tool is a soft sensor (a mathematical model that act as a sensor) to provide information about the mills contents and enable it to be controlled closer to its maximum capacity. The MFP tool is developed by Dr Marko Hilden, a Senior Researcher at JKMRC.

Application of Operating Work Indices in Autogenous

AG/SAG mill product that needs additional grinding in the ball mill, or Corrected Ball Mill Feed. T2 is the 80% passing dimension of the Corrected Ball Mill Feed. Figure 1. Comparison of the Particle Size Distribution Slopes Figure 2. Relationship Between the Transfer Size Distribution Slope and T 80 or AWi0/BWi Figure 3.

Critical Speed Calculation Formula Of Ball Mill

research concludes that lowering the ball mill filling percentage negatively affects mill methods of calculating the net mill power draw for an industrial mill... showing two different charge levels, with the same mill shell % critical speed. Choosing a SAG Mill to Achieve Design Performance Starkey the correct power required

The engineering and process effects of choosing a motor

filling, and so on. The operating power draw of the mill and, consequently, the motor torque consumed will vary during mill operation as the operating parameters vary. The SAG mill power draw model of Austin (using the calibration by Doll, 2013) is used to predict the process power draw at the mill shell, Pshell, and the efficiency losses for

ball mill liner Magotteaux

Designs of grate liners depend on their drilling pattern, mill speed, grinding media diameter, media filling percentage, throughput and the presence of pebble. They are used in AG mills, SAG mills, all grate discharge mills (Rod and primary mills, etc.)

Estimated Water Requirements for the Conventional

water usage. The crushed ore is transferred to a semiautogenous (SAG) mill or ball mill where the ore is further reduced in size. Water is added to the ball mill, in which a slurry that usually contains from about 20 to 55 percent solids is produced (Singh, 2010; International Mining, 2011) (see fig. 2). The

Automated SAG Mill Speed Control Using Oncontact

There are two lines consisting of this SAG ball mill combination where the SAGs are denoted as SAG1 and SAG2. Note Each SAG mill is operated in a closed circuit manner in conjunction with a typical trommel screen and pebble crushing circuit. The ball mills are also operated in a closed circuit employing two hydrocyclone separators. The

Optimization of mill performance by using

different liner designs at different mill speed but with constant filling degree (30%). Indeed, as explained previously, at a mill stop, the measurement of ball charge filling degree could be undertaken and will provide the static media charge angle (βstatic = 143°). An online measurement of the similar angle (βdynamic), when the mill is running,

A Method to Determine the Ball Filling, in Miduk

The results obtained from this work show, the ball filling percentage variation is between 1.2 3.7% which is lower than mill ball filling percentage, according to the designed conditions (15%). In addition, acquired load samplings result for mill ball filling was 1.3%

Experimental Analysis of Semiautogenous Grinding Mill

Oct 04, 2019· They found that the shoulder angle was a function of the mill speed and ball filling. To predict the power of the SAG mill, Hoseinian cell weight of mill load, solid percentage and inlet and outlet water to the SAG mill. Zhong B () Investigation on measuring the fill level of an industrial ball mill based on the vibration

(PDF) Maximising SAG mill throughput at Porgera g mine

Summary of Mill Survey Results 80 survey 1, SAG 2 70 Survey 1 2 2 3 60 Blast # 340319 320314 320314 310316 SAG 1 Muck Load, vol % 26.3 22.8 26.9 50 Ball Load, vol % 11.0 13.8 13.8 13.2 40 Ball Size, mm 150 125 125 125 30 Power, KW 4550 4650 3970 4310 20 Bearing Pressure, 3900 3740 3720 3927 10 kpa 0 Mill Speed, rpm 11.42 11.42 10.79 11.50

Flexible milling and grinding solutions that last FL

For the mining industry, our semiautogenous (SAG) grinding mill uses a minimal ball charge in the range of 615 percent. It is primarily used in the g, copper and platinum industries as well as in the lead, zinc, silver, and nickel industries. Autogenous (AG) grinding mills involve no grinding media as the ore itself acts as the grinding media.

SAG Mill Grinding Circuit Design 911metallurgist

Jun 06, · SAG circuits may employ low to relatively high ball charges (ranging from 2% to 22%, expressed as volumetric mill filling) to augment autogenous media. Higher ball charges shift the breakage mode away from attrition and abrasion breakage toward impact breakage; as a result, AG milling produces a finer grind than SAG milling for a given ore and otherwise equal operating conditions.

SAGMILLING.COM .. Articles

Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to

SAGMILLING.COM .. Articles

Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to

Top 5 productspecific milling technologies used in

Jul 07, · Ball mills for superfine calcium carbonate. Ball mill classifier systems have been improved over time and are now capable of achieving much finer products. In the past, a particle size with a D97 of 10 microns was only possible. Now particle sizes down to a D97 of less than 3.5 microns can be achieved, with a D50 in the range of 1.5 microns.

ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION

Jun 24, 2006· A 35% decrease in the SAG mill power draw from 3,908 HP to 2,526 HP (2,915 kW to 1,884 kW) was recorded. This equates to a 47% decrease in SAG unit energy consumption from 8.98 kWh/ton to 4.74 kWh/ton. A 11% decrease in SAG mill speed was

SAG Mill Official Feed The Beast Wiki

Electrical Steel Grinding Ball Electrical Steel 120% 165% 80% 40, Energetic Alloy Grinding Ball Energetic Alloy 160% 110% 110% 80, Vibrant Alloy Grinding Ball Vibrant Alloy 175% 135% 135% 80, Redstone Alloy Grinding Ball Redstone Alloy 100% 100% 35% 30, Conductive Iron Grinding Ball Conductive Iron 135% 100% 100% 40, Pulsating Iron Grinding Ball