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Fundamental Concepts of Sag-Tension Relationship in ...

Conductors used in power lines will expand or contract with changes in the temperature. The rate of expansion or contraction is dependent on the conductor materials and the degree of temperature change. ... W1 = unit weight of the conductor at initial temperature (N/m) Δt =t 2 – t 1 = temperature change ... The basic relationship between sag ...

Conversions between test types - SAGMILLING.COM

Bond rod mill work index (Wi RM) SAG Grindability index (SGI) or SAG Power index (SPI™) Drop weight test, both JK and SMC (A×b, DWI, Mia, etc) Bond rod mill work index versus A×b Only considering rod mill work index tests performed in laboratory mills equipped with wave liners. This is the standard specified by F. Bond and is typical of ...

(PDF) Influence of feed size on AG/SAG mill performance ...

Influence of feed size on AG/SAG mill performance ... 50.0 5500 constant mill weight/power draw control strategy this would result in a 5000 0.0 decrease in throughput. It is important to stress that this response is 13:00 14:00 15:00 16:00 17:00 similar to that shown in Figure 2 and relates to sag mill …

Mill (grinding) - Wikipedia

SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. A SAG mill with a 44' (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. Attrition between grinding balls and ore particles causes grinding of finer particles. SAG mills are characterized by their ...

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…

Sag in a Transmission Line: What is it? (And How To ...

Sag is mandatory in transmission line conductor suspension. The conductors are attached between two supports with the perfect value of sag. This is because it protects the conductor from excessive tension. In order to permit a safe level of tension in the conductor, conductors are not fully stretched; rather they are allowed to have sagged.

SAG Mill Rubber Liner | Semi Autogenous Mill Rubber ...

SAG Mill Rubber Liner Applications: Maintenance Of SAG Mill Rubber Lining: 1. The Rubber Lining Plate Shall Be Replaced When It Is Worn 70% Or Has 70mm Long Crack. 2. Replace The Rubber Lining Plate When The Bolt Is Damaged And The Lining Plate Is Loose. 3. The Main Bearing Of SAG Mill Shall Be Replaced In Case Of Serious Wear. 4.

Enhanced SAG Mill - Official Feed The Beast Wiki

The Enhanced SAG Mill is a machine added by Ender IO.It uses Micro Infinity (µI) to grind (or mill) items into their crushed variants, like Ores into Dusts.The SAG Mill has four output slots; recipes can have 1-4 different outputs, with different chances of obtaining those outputs. This machine is an upgraded version of the SAG Mill, offering increased energy storage and power use, resulting ...

GROSS POWER CALCULATOR - SMC Testing

% solids by weight of discharge slurry 0 77 0 78 . It should also be remembered that power draws indicated in the control room of a concentrator may not ... Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry pool. This phenomenon results in overflow mills usually drawing less power than grate discharge

TECHNICAL NOTES 8 GRINDING R. P. King

LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14)

RESPONSE OF PRIMARY GRINDING MILL PERFORMANCE TO …

SAG mill and how the vibration response and hence mill operating conditions vary as a function of time, including ... where the centre of rotation of the pendulum weight is within 2.7 m of the centre of rotation of the grinding mill, and when a power cable can be run between the power supply and a transmitter box mounted either in an

Coal Ball Mill | Grinding for Different Kinds of ...

Coal Ball Mill. Feeding size: ≤25mm. Capacity: 5-20t/h. Functional advantages: Less failure and reliable operation. Applications: It is mainly used for grinding coal of various hardnesses, and is also suitable for coal powder making system and ore milling system in cement plants and metal magnesium plants. Email: [email protected]

Power-based modelling of single-stage AG and SAG mill …

other methods. The ball mill correction factor (CFnet) is empirical and one way of estimating it was presented by Amelunxen at the Procemin 2013 Short Course by Doll & Amelunxen. The SGI equation uses a transfer size between a SAG and ball mill; it is proposed that a synthetic transfer size of 2100 µm be used to model single-stage SAG mills. 5.9ˇ

SAG Mill Liner Design - Mineral Processing & Metallurgy

End and shell liner design in these mills is much the same as for SAG mills. The effect of liner design on performance is equally as important. For instance, in an iron ore operation using 6.4 m (21 ft.) mills, mill throughput was increased by 15 percent and power …

Modelling SAG milling power and specific energy ...

In Fig. 3, Fig. 4 the data is presented in order to show the effect of the fresh feed size, particularly the % −6″ +1″ (−152 +25 mm), on the SAG mill power consumption (Pc) in kW and on the SAG mill specific energy consumption (Ecs) in kW h/t, obtained by dividing the power consumed (kW) by the fresh feed rate (t/h).

1multivariable controller for sag mill

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 …

(PDF) SINGLE STAGE SAG/AG MILLING DESIGN SINGLE STAGE SAG …

6 OPERATION OF A SINGLE STAGE MILL Control Philosophy In a single stage SAG mill, there are two regimes of breakage that must be controlled in order to maximise power efficiency and hence capacity. These are the high energy coarse rock breakage, load control and low energy breakage to control circulating load and to meet the target product size.

A plant-scale validated MATLAB-based fuzzy expert system ...

The behaviour of SAG mill itself is very complicated due to time delays and variations in ore characteristics. There are interactions between SAG mill operating parameters (bearing pressure, mill load weight, power draw and motor torque).

RELIABILITY OF SOME ORE CHARACTERIZATION TESTS

JK Drop Weight Test (Napier-Munn et al., 2005) 64 75 Single particle / No Crushers, AG / SAG mills SMCC Test (Morrell, 2004) 31.5 5 Single particle / No AG / SAG mills SAG Design Test (Starkey et al., 2006) F80 = 152 10 Batch / No AG / SAG mills MacPherson Test (MacPherson and Turner, 1978) 32 100 Continuous / Yes AG / SAG mills

Ball Mill Design/Power Calculation

If P is less than 80% passing 70 microns, power consumption will be. Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to …

Variable Speed SAG Mill

The control strategy for the SAG mill is fairly basic. Parameters which can be adjusted are feed tons per hour and mill speed. The combination of the two are used to maintain a target feed trunnion bearing pressure of 520 psi, and power draw between 95% and 105% of …

MILLING CONTROL & OPTIMISATION - Mintek

Mill Feed(t/h) & Load(t) 300 1800. Power(kW) 250 200 150 100 50 0 1600 1400 1200 1000 800 600 400 200. MillStar OFF MillStar ON. Mill Overloads Mill Feed Cuts DAY 1 DAY 2 DAY 3 DAY 4 Mill Feed PV Mill Feed SV Mill Load Power. Figure 7: Mill Power Optimisation results for Case Study 1 Figure 8: Mill Power Optimisation results for Case Study 2

AG - Autogenous & SAG Semi-Autogenous Mill Design Calculations

The SAG mill was sized with 746 kW to give a 25% contingency for power swings on the calculated power. The ball mill was sized at 1120 kW. Total installed power for comminution exceeded that required for conventional grinding by a factor of 1.163 (including secondary crushing). The power split between primary and secondary grinding stages in a ...

Orway Mineral Consultants Canada Ltd. Mississauga, ON ...

The SAG Power Index (SPI) test (Starkey & Dobby, 1996) uses a benchscale SAG mill test to - determine the specific energy of an industrial SAG mill. The test is operated in closed circuit and the time required to grind the material to a P 80 of 1.7 mm is used to predict AG/SAG …

What's the Difference Between Ball Mill, Rod Mill and SAG ...

If the SAG mill is not intended to be the rate-limiting step in a process plant, then it is best to adjust the SAG load (and power) to hold a constant tonnage to satisfy another constraint elsewhere. Underground mines are an example: the hoisting capacity of the mine shaft is the rate-limiting step in the process, and the SAG mill must adapt to ...

SAGMILLING.COM .:. Articles

An updated data set for sag mill power model calibration This paper expands the SAG mill survey database published by the Author at Procemin 2013. The new database includes 49 published SAG/AG mill surveys and includes mills from all over the world.

How Mill Load/Charge is Estimated - Grinding ...

Sag mills in the gold and copper operations would vary from 6%- 15% and are normally grate discharge types in most cases the densities of the slurry in the mill is over 65% and that goes for ball mills also. ... power draw, ore feed and weight with density control.

Sample Calculation of Sag and Tension of Transmission Line ...

This is an example calculation for sag and tension in the transmission line. You may opt to review first the fundamental principles and formulas from this post.. The foregoing calculation is based on the linear cable model on which plastic elongations are ignored. Also, the loading of the conductors is based on the National Electrical Safety Code 2017.

Model Predictive Control of SAG Mills and Flotation Circuits

interacting variables (such as rotation speed and ore feed rate on SAG mill weight). A more advanced approach to automation that seems to be popular among mineral processors is the use of rule-based expert systems. A number of these systems are commercially available and, typically,

Sag and tension - SlideShare

CALCULATION OF SAG. 9. CALCULATION OF SAG. 10. CALCULATION OF SAG. 11. WHEN SUPPORTS ARE AT EQUAL LEVELS l = Length of span w = Weight per unit length of conductor T = Tension in the conductor. Consider a point p on the conductor. •Taking the lowest point o as the origin, let the co-ordinates of point p be x and y.

AUTOMATION ADVANCED CONTROL EXPERT (ACE)

• Manage power and torque limits to prevent mill overload SAG MILL CASE STUDIES Location: Minera Centinela Mine • Reduced feed variability by 18% • Increased SAG mill throughput by 13.5% and reduced energy consumption per tonne by 9.3% Location: Minera Los Pelambres Mine • Reduced feed variability by 5.6%

Purchase of New SAG Mill from First Majestic Silver Corp

The SAG Mill is paired with a motor with a maximum power rating of 3,300kW. Using a power load of 2,800kW (500kW under the installed power), a 4.5% ball charge, the daily throughput is …

SAG Mill Grinding Circuit Design - 911metallurgist.com

Traditionally, many engineers approached SAG circuit design as a division of the total power between the SAG circuit and ball-mill circuit, often at an arbitrary power …