### MODELING THE SPECIFIC GRINDING ENERGY AND BALL .

2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALL-MILL SCALEUP Ball-mill scale up (Bond's Law)Data: zBond work index w i zFeed D f and product d size (both 80% cumulative passing) Result: The specific grinding energy w Mill power draw P = wT, where T the mill capacity Mill dimensions (from Tables or charts)

### Modelling SAG milling power and specific energy ...

Modelling SAG milling power and speciﬁc energy consumption including the feed percentage of intermediate size particles M. Silva, A. Casali⇑ Mining Engineering Department, Universidad de Chile, Beauchef 850, Santiago 8370448, Chile

### SAGMILLING.COM .:. Mill Critical Speed Determination

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.

### MILLING CONTROL & OPTIMISATION - Mintek

MILLING CONTROL & OPTIMISATION MillSTAR. ... close to the maximum mill power draw. The power-load relationship ... Figures 8 and 9 on the right show results from a gold plant's SAG mill achieved with MillStar's Segregated Ore Feed Controller combined with the Power Optimiser:

### Choosing a SAG Mill to Achieve Design Performance

the correct power required to grind ore in a SAG mill, by developing ore hardness variability functions for the ore body to be mined. This paper describes the next step in the SAG design process, which is choosing a SAG mill to accomplish the required specified design performance.

### power calculation formula of sag mill - greenrevolution

PDF (1044 K) - Journal of Mining and Environment (JME) power index (SPI), and a formula for the SAG mill ... calculation of liner weight and volume at each stage ... a Starkey mill was used to measure SAG mill power.

### Selection of Comminution Circuits for Improved Efficiency

grinding, to single stage crushing and semi-autogenous grinding (SAG) and ball mill (SAB) circuits. This progression has, not necessarily, been accompanied by an improvement in the efficiency of power utilisation in achieving the target grind size, but has seen an improvement in the overall efficiency of mineral processing as

### Application of Operating Work Indices in Autogenous ...

SAG and the ball mill circuits (JKMRC, 1996). The phantom cyclone is used to classify the AG/SAG mill product into two products; the phantom cyclone overflow that is similar to the final ball mill product, and the phantom cyclone underflow is then used as an adjusted ball mill feed for the ball mill power calculation.

### USING THE SMC TEST® TO PREDICT COMMINUTION .

USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE ... AG/SAG mill and crusher circuit simulations through the use of JKSimMet. Independent of this it can be used in power-based calculations, which in conjunction with the Bond ball work index test, enable the prediction of the specific energy of comminution circuits ...

### SINGLE STAGE SAG/AG MILLING DESIGN

SINGLE STAGE SAG/AG MILLING DESIGN ABSTRACT Single stage semi-autogenous / autogenous (S/AG) milling has become a common design for a variety of ore ... stability associated with the constant power draw and fine media in the ball mill. Lack of grinding media in

### power calculation formula of sag mill

power calculation formula of sag mill. By rearranging the formula to [2], the operating work index (Wio), ball mill feed for the ball mill power calculation This technique is specifically suitable for modelbased calculations, as it requires efficiency curve) The phantom cyclone, power draw of AG/SAG and ball mills. Business offer

### Difference Between Sag Mill vs Ball Mill - mech4study

Oct 12, 2017· In ancient time, the mills were operated with muscle power (by hands), water animals and wind. They were totally based on the mechanical energy by natural resources and living beings.There are many types of mills which are used in the grinding industries. Today we will discuss about two important mill, sag mill and ball mill.

### AG - Autogenous & SAG Semi-Autogenous Mill Design Calculations

Table of ContentsSAG Mill ChargeSAG Mill Horsepower — Drive PowerOre Testing for AG & SAG Grinding Mill Design Mill Sizing: After laboratory and pilot plant testing confirm the feasibility of autogenous or semi-autogenous grinding, it can be used to establish the exact grinding circuit and mill size. In the pilot plant tests, the tare power of the pilot plant mills should be determined ...

### SAGMILLING.COM .:. Home

Sagmilling 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.

### how to calculate sag mill ball charge - BINQ Mining

C and L are used to calculate the power drawn by a SAG mill chamber ... how to calculate sag mill ball charge »More detailed. ball mill circulating load calculation. Optimizing SAG mill product size in SAG mill – ball . The SAG Mill will operate in closed circuit .

### Mill (grinding) - Wikipedia

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 large diameter and short length as compared to ball mills.

### Calculation of Sag & Tension in Transmission Line - for ...

Calculation of Sag & Tension Calculation of sag and tension in transmission line depend on the span of the conductor. Span having equal level supports is called level span, whereas when the level of the supports is not at an equal level is known as unequal level span.

### A Method of C alculating Autogenous/ Semi-Autogenous ...

stage ball mills, rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method. Rod mill and AG/SAG mill products are similar and tend to be not as steep as a 0.5 slope when plotted on log-log paper. This is because the particle size distribution (PSD), these mills

### Ball Mill Design/Power Calculation

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 size', product size as P80 and maximum and finally the type of circuit open/closed ...

### two stage ball mill power consumpation calculation

Ball Mill Calculation Power Calculation polrecreatie. Calculation of the power draw of dry multicompartment ball mills May 6, 2004,right mill for the specified duty is the most critical for circuit design, since it,calculate the power that each ball mill . ... Modelling SAG milling power and specific energy .

### SAG Calculator | Edmund Optics

SAG Calculator. Determine sag of a surface based on radius of curvature and diameter. Calculator can be used to provide simple mechanical parameters that simplify specification of optical components. Commonly used for lenses and mirrors.

### GROSS POWER CALCULATOR - SMC Testing

GROSS POWER CALCULATOR General ... calculations by the user. If the mill has cone ends the model automatically calculates the volume of the ... the model from grate to overflow when predicting the power draw of an AG/SAG mill. 4 Figure 1 – Measured vs Predicted Motor Input Power 0

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

DESIGN OF THE 40 FOOT DIAMETER SAG MILL INSTALLED AT THE CADIA GOLD COPPER MINE ... size distributions and Bond-type calculations (as reported by Rowland ... SAG mill base power was estimated from ...

### TECHNICAL NOTES 8 GRINDING R. P. King - Mineral Tech

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) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the ...

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