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mill is the energy consumption. The power supplied to the mill is used primarily to lift the load (medium and charge). Additional power is required to keep the mill rotating. 8.1.3 Power drawn by ball, semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 8.3 Ad this can be used to establish the essential ...

I tried to use this calculator for sizing solar panels in hybrid system for micro GSM BTS, but size of invertor is too big for total load of 500 W. For total load of 500 W with operational time 24 h per day, calculator gives size of invertor about 555 KW. I do not understand why. I guess there is mistake in cell which shows KW. Regards,

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 consumption as a function of mill size, level and density of ...

the ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction). Hence from equation 7, to crush to the ball mill circuit feed size (x. 2) in open circuit requires specific energy equivalent to: f x f x 2. 1 W c ic. 1.19* 4 2 M x x. 1 (10) For closed circuit crushing the specific ...

Mar 08, 2013· calculation of ball mill grinding efficiency. dear experts . please tell me how to calculate the grinding efficiency of a closed ckt & open ckt ball mill. in literatures it is written that the grinding efficiency of ball mill is very less [less than 10%]. please expalin in a n excel sheet to calcualte the same. thanks. sidhant. reply

The number of SAG mill revolutions required to grind the material to a P 80 of 1.7 mm is used to predict AG/SAG specific energy using quation 4. Correction E factors for feed size and pebble ing are applied to the AG/SAG specific energy, as well as specific crush energy adjustment from 1.7 mm to the mill …

Autogenous/Semi-Autogenous SAG Mill specific energy calculations This presentation focuses on a method of calculating AG/SAG mill specific energies using only a combination of Bond Work indices and JK parameters then applying efficiency factors.

The three values CEMA provides are 3%, 2%, and 1.5% sag Those percentages are based on material lump size, the proportion of lumps vs. fines, and the idler troughing angle. Note that T 0, the minimum tension to prevent sag, may be reduced if the belt is less than fully loaded. The three pertinent equations are: T 0 = 4.20 Si (Wb + Wm) for 3% sag

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% passing 152 mm to 80% passing 1.7 mm (W SDT), herein referred to as macro ore hardness. The SAG mill product is then crushed to passing 3.35 mm and is subjected to the Bond ball mill work ...

Sag-Tension Calculations: Refinements and Enhancements Made by Trimble Energy Solutions by: Jacques Hamian and Yair Berenstein Abstract Sag-tension programs have traditionally calculated the conductor's sag-tension characteristics using the ALCOA graphic method. By refining the input used in this equation, and augmenting

The Bond low energy impact ... Backup to the Mill Filling Calculation spreadsheets that describes the geometry and mathematics.... Alex Doll: modelling: ... SAG Mill power draw models are used in mill design and grinding circuit modelling to predict how muc h pow er wi...

SAGDesign testing provides SAG pinion energy grindability in kWh/t to within +/- 5% from 152 to 1.7 mm, and Bond Ball Mill Work Index on SAG ground ore, from the SAG test on the same sample. Starkey & Associates uses the patented SAGDesign technology to calculate accurate mill sizes from measurements on a client's own ore samples.

utility line design calculations The following calculations are included in the website, requires minimal training and take seconds to perform. Utility Line Design has over twenty-five planned calculations that will be added to the website at no added charge in the coming months.

Ws Specific energy correction for size distribution (kWh/t) WiBM Bond Ball Mill Test Work Index (kWh/t) 3. KEYWORDS Autogenous Grinding (AG), Ball mill, Bond Work Index (Wi), Comminution circuit, High Pressure Grinding Rolls (HPGRs), Rod mill, Semi-Autogenous Grinding (SAG), Spe-cific energy (W) 4. INTRODUCTION AND BACKGROUND

the ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction). Hence from equation 7, to crush to the ball mill circuit feed size (x. 2) in open circuit requires specific energy equivalent to: f x f x 2. 1 W c ic. 1.19* 4 2 M x x. 1 (10) For closed circuit crushing the specific ...

2.1 SAG mill modeling In MODSIM, one of the simulation models used for a SAG mill unit is SAGT (Semi-Autogenous Grinding with Trommel) model. In this model, a SAG mill with a trommel screen at mill discharge is modeled using the full population balance …

griding/semi-autogenous grinding (AG/SAG), mill speci c energy is now calculated by various ﬁ empirical formulae and pilot testing carried out in small laboratory mills. Barratt (1989) described a method using Bond Indices than adding a single factor of 1.25 to arrive at the AG/SAG speciﬁ c energy.

Apr 01, 2001· When using SPI to calculate grinding energy consumption, the calculation differs slightly. Gross SAG mill power is measured at a meter and includes the drive train power loss. This is a practical method of measurement because most SAG mills have a …

The designer must understand the assumptions and calculations contained in the spreadsheets and is responsible for their use. Most if not all spreadsheets contain macros. Many engineering spreadsheets are available for use. CAD drawings are available in the Wisconsin engineering CAD drawings section. These documents require Microsoft Excel.

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.

Electrical tools (MS Excel Spreadsheets) This section is dedicated to tools every electrical engineer can use in daily work.These spreadsheets below will make your job much more easier, alowing you to shorten the time used for endless calculations of cables, voltage drop, various selections of circuit breakers, capacitors, cable size and so on.

Dec 18, 2013· This quantity is small compared to the power used by a semi-autogenous mill and a ball mill in a primary grinding circuit; a ball mill can have an installed power of up to 15 MW, while installed power for a SAG mill can go up to 25 MW. However, the energy used for fine grinding is still significant.

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 ...

SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: ()] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill

Sag-Tension Calculations: Refinements and Enhancements Made by Trimble Energy Solutions by: Jacques Hamian and Yair Berenstein Abstract Sag-tension programs have traditionally calculated the conductor's sag-tension characteristics using the ALCOA graphic method. By refining the input used in this equation, and augmenting