sag mill design calculations

Mill Throughput Capacity

The SAG test reproduces commercial SAG mill grinding conditions on 4.5 L of ore and determines the SAG mill specific pinion energy to grind ore from 80% .... by the calculation routine must be defined in each corresponding unprotected white background cell of the here attached Testwork Results, Design Hardness...

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paper - Starkey & Associates Inc.

This proved that a Bond BM Wi alone must never be used for designing a SAG mill. The ratio of SAG hardness (to ... mill work index was defined as a key factor in the design of a new SAG/ball mill circuit. Simulation techniques ... ore body and design a. SAG/ball mill circuit to match that ore body by first principle calculations.

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calculation of the required semiautogenous mill power based on the ...

milling. The method is widely used by RIVS in extended calcula- tions at early design stages. The article is composed of sections successively informing on the existing techniques of sizing SAG mill power, Bond work in- dexes and their applicability to calculating autogenous/semiau- togenous mills. Finally, the authors give...

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Ball Mill Design/Power Calculation - 911 Metallurgist

Mar 17, 2017 ... The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk...

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SAG Mill Grinding Circuit Design - 911 Metallurgist

Oct 1, 2017 ... Ball Charge Motion inside a SAG Mill; SAG Mill vs Ball Mill. SAG Mill Liner Design. SAG Mill Circuit Sampling. AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the basis for a variety of circuit configurations. SAG circuits are common in the industry based...

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design of the kubaka grindng circuit using spi and ... - 911 Metallurgist

design SAG/ball mill grinding circuits. ... mill grinding circuit. Both plants were designed using SPI (SAG Power Index) and Bond (Ball Mill Work. Index) tests. Both of these projects have also been written up as ..... Basic grinding laboratory results are given in the following four tables along with the design calculations used to...

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OMC Power-Based Comminution Calculations for Design, Modelling ...

which is used in turn to size a mill for dimensions, internal geometry and loading conditions to match the power draw. The most frequently used power-based methodologies for calculating energy requirements for comminution circuits using AG/SAG mills are concisely presented in the following section. This paper describes...

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technical memorandum - SAGMILLING.COM

Nov 11, 2015 ... grinding calculations which operate in “power at the pinion”3. The SAG mill motor will normally operate at 90% of its rated output power. Combining this design criteria with the pinion/gear efficiency (use 0.985 for a synchronous motor, pinion and gear; use 1.000 for gearless) provides the following equation...

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SAGMILLING.COM .:. Home

Sagmilling.com is home to a collection of both free and subscription-based calculation tools to aid metallurgical process engineers perform comminution calculations. Grinding circuit design tools, including for SAG mill-ball mill circuits, and geometallurgy energy models are available to subscribers. The online library of...

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Modelling SAG milling power and specific energy ... - CiteSeerX

Oct 7, 2014 ... ondary ball milling. In these circuits the SAG mill is the largest energy consumer. In many engineering projects either a power equation and/or a specific energy equation are used for the designing of these mills but not always with acceptable results. In general these equations are used to predict power con...

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DESIGN OF AG/SAG MILL CIRCUITS USING THE SMC TEST (PDF ...

Jan 29, 2016 ... DESIGN OF AG/SAG MILL CIRCUITS USING THE SMC TEST ... The DWi has also been found to be correlated to the point load index and UCS, which makes it valuable for predicting AG/SAG mill feed size as well as conducting ..... The energies from the two calculations are then added together to.

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Mill drives - Future of Manufacturing - Siemens

“Payback”, specifications, risk, power rating, torque output, design mill speed, torque demand, limitations, stresses ... Once the power level for the primary (SAG) mill has been set, i.e., design tonnes per hour (tph) x ..... on temperature it is possible to calculate the average temperature of the rotor winding from the resistance.

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SAG Mill Operation at Cortez: Evolution of Liner Design from Current ...

as well as illustrating current SAG mill bottlenecks. This paper will discuss the evaluation that addressed operator and maintenance observations, historical PLC data, and “crash stop” observations to calculate charge motion, packing between lifters, and slurry transport through grate and pulp lifters. The performance of the...

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RELIABILITY OF SOME ORE CHARACTERIZATION ... - Ausenco

test methods used by AusGrind for throughput and comminution power calculations are: •. DWi from SMCC tests. •. Axb from JK drop weight tests. •. CWI from Bond Crusher tests. •. RWI and BWI from the Bond rod and ball mill tests. •. Other testwork data such as the Advanced Media Competency tests, SPI and SAG Design...

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ball mill speed calculation - arhc.biz

calculate critical speed of ball mill - arisesolution.in. calculate percent of critical speed ball mill. Design of the 40 foot SAG Mill Installed at the,- calculate percent of critical speed ball mill,both, a variable. Get More Info. image...

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THE APPLICATION OF THE SAG POWER INDEX TO ORE BODY ...

The SAG Power Index test (SPI) is a tool for forecasting autogenous mil! performance. Much effort has been directed towards the development of the process models relating. SPI to throughput estimates, but IiUle has been directed towards ore body modeling. Blending studies are presented showing that the SPI is not...

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Advances in Discrete Element Method ... - University of Utah

These include mill power draft calculations, shell lifter design, lifter wear prediction, pulp lifter simulation and ore particle breakage in grinding mills. ... SAG mills and AG mills, not to mention balls mill as well. The principal advances made with DEM are discussed in this manuscript. MILL POWEr DrAFt. The discrete element...

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Inferential measurement of SAG mill parameters - ScienceDirect

Abstract. Semi-autogenous (SAG) mill total load and ball load have a marked influence on mill performance. ... Crushing and Grinding Calculations Part I and II, 6, British Chemical Engineering (1961), pp. 543-548 ... M.H. MoysA Model of Mill Power as Affected by Mill Speed, Load Volume, and Liner Design. Journal of the...

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Impact Load Behavior between Different Charge and Lifter in ... - MDPI

Jul 31, 2017 ... of lifter design, mill speed and filling, little is known about a direct measure of the impact force of the lifter and the ..... and the calculate results are affected by the mill length and diameter, ball density, ball filling and ..... Mohsen, Y. Analysis of Liner Wear Impact on Charge Behaviour in AG and SAG Mills.

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Grinding Circuit Design for Adanac Moly - SGS

hardness of each block in terms of both SAG and Ball milling with allowance for annual periods when the ore is harder to ... The mill design was then made using the estimated hardness of each individual block with an allowance for annual fluctuations in the grindability of the ore. .... to extend the analysis to calculate how.

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Autogenous mills, semi-autogenous mills and ball mills for ... - Polysius

Ball mill with. COMBIFLEX® drive for lead zinc ore grinding. Ring motor driven SAG mill for gold ore grinding. SAG and ball mills for com- minuting gold/ ..... design department for use in calculations. Safe and reliable dimensioning of the grinding plants supplied by Polysius is ensured by state- of-the-art hardware and soft-.

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Improved Relationships for Discharge in SAG/AG Mills - UQ eSpace

In recent years, there has been a shift of emphasis on ball mill optimization to semi-autogenous grinding. (SAG) mills. In order to optimize this section, the skills to accurately model and understand its underlying ... of grate/pulp lifter design in AG/SAG mill discharge. The current ..... Calculation Sequence of the Model .

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Mill (grinding) - Wikipedia

To calculate the needed grinding work against the grain size changing three half-empirical models are used. These can be related to the Hukki relationship between particle size and the energy required to break the particles. In stirred mills, the Hukki relationship does not apply and instead, experimentation has to be...

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Optimization of mill performance by using online ball ... - SciELO SA

height 'H' from the charge to the shell and the internal mill diameter 'Di'. By calculating the ratio 'H/Di' and using the graph below. (Figure 1), the charge filling .... design. However, the example of liner design and grinding efficiency uses the media charge angle only. Other examples will explore the interaction between the...

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Optimize SAG Mill Wear Using DEM Simulation - - Rocky DEM

Mar 13, 2018 ... Stopping mill equipment is not a desirable alternative, so the best way to resolve SAG mill challenges is to use simulation technology for equipment design alterations. Replacing the SAG's worn-out liner can occur every six to nine months and cost between $30,000 U.S. and $200,000 U.S. per hour, and...

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Energy and Cost Comparisons of HPGR Based Circuits with ... - CEEC

laboratory testing methodologies, characterizing the properties of the ore and slurry for modelling and simulation of the circuit. The collected SAG feed sample was prepared for pilot-scale HPGR and stirred mill testing to determine the key operating parameters for flowsheet design and power-based calculations. Ultimately...

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Mill Liners - FLSmidth

Sep 20, 2016 ... Mill Liners. Design, Manufacture, Assembly, Replacement & Monitoring ... calculate the useful life of liners. Cutting-edge technology. FLSmidth ... the screen panels. Characteristics: Ceramic rubber lined steel structure. Intended use: SAG Mill. Function: Carrying the selected mineral to the out- side of mill.

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Optimization of mill performance by using online ... - Semantic Scholar

height 'H' from the charge to the shell and the internal mill diameter 'Di'. By calculating the ratio 'H/Di' and using the graph below. (Figure 1), the charge filling .... design. However, the example of liner design and grinding efficiency uses the media charge angle only. Other examples will explore the interaction between the...

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Design Parameters Affecting Tumbling Mill Natural Frequencies

length on mill natural frequencies as well as outline further work. Keywords: Tumbling mills, resonance, design. 1. ... Figure 1: 40 ft diameter SAG mill. Figure 2 Typical mill liners. With the development and larger ... The forward and backward moving waves were illustrated using the calculation determined by. Szymani, Mote...

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CMD Consulting uses Rocky DEM power calculations to ... - fluidcodes

test a mill under non-standard operating conditions.” Mike Daniel. Eco-Comminution Specialist at CMD Consulting. SAG mill design CDM Consulting used to test Rocky DEM power draw. Rocky DEM Model. Empirical Model. Figure 1 - Morrell C-model for mill power draw. Rocky calculations for power draw were shown to...

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ball mill calculations excel

ball mill feed formula in excel. power based sag mill design calculations used in ball mill calculations excelcrusher equipmentgrinding equipmentconveyor the mineral More information of sag mill critical speed formula for calculating the critical speed. Get Price...

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SAG Mill Optimization using Model Predictive Control

KEYWORDS. SAG mill, model predictive control, MPC, expert systems, optimization, Laguerre ... Control of Semi-Autogenous Grinding (SAG) mill weight is an example of an important process that exhibits many .... After the process response model is obtained, a predictive control design is used to calculate the actual output...

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Development of a method to measure charges in tumbling mills

In the SAG mill, the estimated error was 18 mm and the calculated diameter was 9.535 m. Consulting design drawings, the diameter inside liners would be 9.52 m, thus the value calculated with the MCP was very consistent, even considering the liners wear. The relative error for the SAG mill was 0.37%. Among all the...

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BALL MILL AND HPGR - Open Collections - University of British ...

grinding rolls (HPGR) and high speed stirred mill, have been developed and adopted in the hard-rock mining ... focused on the energy and cost comparisons of the existing AG/SAG ball mill circuits with two proposed ...... Table 5.5 Calculation of ball mill circuit specific energy for AG/SAG mill circuits ..............76. Table 5.6...

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Design of the 40 foot SAG Mill Installed at the Cadia Gold Copper ...

crushers treat the SAG mill discharge trommel screen oversize material. .... Minproc in-house software uses a combined reduced efficiency calculation, ... Design parameters chosen for the Cadia SAG mill are shown the following table. Table 2 : Cadia SAG Mill Design Parameters. SAG Mill Dimensions: Diameter – inside...

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effects of grinding media shapes on ball mill ... - WIReDSpace

mills. It is based upon the two-power calculation approaches used in majority of ball and rod mill design processes (Smit, 2000) i.e.; a. The determination of the power required to grind the ore from the given feed size to a specific product size, and b. The selection of the grinding circuit with the mill design that will draw the.

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The Selection and Design of Mill Liners - MillTraj

Dramatic shortcomings of mill liner designs, especially of large SAG mills, - such as rapid failure and even mill ... multi-stream plants, where mill liner design and selection is only tackled on a cost consumables basis. However ...... Monitoring the full profile of a liner as it wears is useful in providing the input for calculating the.

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4,8,10,16 - Imperial Spiral

The model characteristics are then discussed further, including sensitivity analysis, calculation sequence, charge ... Model Overview. The Inferential measurement models of the SAG mill inventories, feed rate and sizing and mill discharge ...... AG and SAG Mill Circuit Selection and Design by Simulation. In: SAG 1996. UBC.

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Farnell-Thompson

ESCONDIDA PHASE IV EXPANSION, BHP, PERU. Working as a member of the FFE Minerals team, Farnell-Thompson performed the conceptual engineered, design calculations and major component design, for the 38' gearless SAG mill and three 25' gearless ball mills constituting a major expansion for the world's largest...

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A COMPARISON OF WEAR RATES OF BALL MILL GRINDING ...

The Ball Mill Abrasion (BMA) test was developed by the University of Queensland Materials Performance group ... Ball mill balls experience a greater number of impacts, but at lower magnitude than SAG mill balls, due to the smaller ball size, and smaller mill diameter. ..... sufficient accuracy by calipers to calculate the.

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