power draw calculator of ball mill

(PDF) Prediction of grindingmill power ResearchGate

The power draw and grinding efficiency of tumbling mills depend solely on motion of the grinding charge and the ensuing ball collisions that utilize the input power to cause particle breakage ...

Power Draw of Grinding Mills its Measurement and Prediction

Abstract. In recent years the Julius Kruttschnitt Mineral Research Centre (JKMRC) has developed mathematical models for accurately predicting the power draw of ball, semiautogenous (SAG) and ...

Experimental investigation of the power draw of tumbling mills in wet ...

A power analyser was utilized to measure mill power. Increase in mill speed and ball filling leads to a remarkable increase in the amount of the power. Preliminary results show that there is a definite trend between the power and the slurry filling U. Mill power draw is maximum at slurry concentration 6070% and slurry filling

(PDF) INVESTIGATION OF EFFECTS OF GRINDING MEDIA SHAPES ... ResearchGate

Charge behaviour and power consumption in ball mills: sensitivity to mill operating conditions, liner geometry and charge composition., International Journal of Mineral Processing 63 : 79 1 14.

PDF Gmsg Guideline: Determining the Bond Efficiency of Industrial Grinding ...

closing screen for the ball mill test one (standard square root of 2 series) mesh size coarser than the plant ball mill circuit P80. If between standard mesh sizes, the finer of the chose two. Results of Bond ball mill tests conducted with closing screens of 75 µm or finer are to be treated with caution. The

AG Autogenous SAG SemiAutogenous Mill Design Calculations

Figure 3a and 3b gives the results of the computer calculation. The mill power at the pinionshaft for a 30% volume charge is the sum of: Figures 3a 3b give the power for an autogenous mill. Figures 4a and 4b are for the same size mill with a ball charge of 6% of mill volume (290 lbs. per cubic foot).

Module2 Rod and Ball Mill Power Draw [PDF Document]

The following power draw calculations apply to wet overflow ball mills* .The approach to calculate ball mill power draw is the same as for rodmills. However, there is an additional step for ball mills with insidediameters greater than 3 meters (10 feet). In such mills, media sizenoticeably affects power draw and must be considered in ...

Ball Mill Power Calculations 911 Metallurgist

A nice and pretty online Ball Mill Powerdraw Calculator was put live by one of the great prophets of grinding. ... The user interface offers Metric OR Imperial measurements for sizing SAG/AG and Ball Mills of overflow or grate type discharges. by David Michaud March 17, 2017 August 23, 2015 Categories Tools of a Metallurgist.

ball mill charge volume calculation marketreachcalculator

Ball mill calculation pdf This refers to a document in PDF format that explains the various calculations involved in ball mill design, operation, and optimization. It includes calculations such as mill sizing, mill power draw, grinding media charge calculation, and other important parameters.

PDF MODULE #5: FUNCTIONAL PERFOMANCE OF BALL MILLING Metcom Tech

• Effective mill power draw • Ball mill specific grinding rate • Ball mill grinding efficiency The circuit output is defined as the production rate of fines by the circuit. It is calculated from three values: 1. The dry ore feed rate to the circuit (t/h). 2. The % fines in the circuit feed. 3. The % fines in the circuit product.

Ball Charge and Grinding Efficiency Grinding Classification ...

The main control on the power draw for a BM is the load of grinding media however adding water to the cyclone underflow can also be short term control of BM power. Higher ball loads will result in finer grind but don't overcharge. If throughput of slurry to BM decreases the mill power draw will increase because balls grinding against balls ...

Calculation of energy required for grinding in a ball mill

The grindingproduct size, P, in a Bond ball mill, which is given by the aperture size which passes 80% of the grinding product as a function of the aperture size of the test screen Pk, can be expressed by the formula P= P k K 2. These functions for G and P enable us to calculate the value of Wi for any other size of grinding product if we know ...

Methods to Estimate AG/SAG Mill Power Requirements

By repeating tests at different volumetric ball loads but the same initial total charge load one could develop a comprehensive SAG big challenge is to reconcile Malcolm Powell's Grind Curves for a continuously fed mill controlled to maintain a constant total load volume at values above those giving the maximum throughput or power draw.

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

Power draw is inherently predicted by the model and is based on the degree of size ... Minproc inhouse software uses a combined reduced efficiency calculation, based on pilot plant SAG mill discharge size distributions, pilot plant SAG ... was determined by deducting the installed ball mill pinion power of kWh/t from the maximum overall ...

Calculation of energy required for grinding in a ball mill

INTRODUCTION The energy consumption for grinding, according to Bond (1961), is deter mined by the formula: / 10 10 (I) The work index is determined by grinding experiments carried out in a labo ratory Bond ball mill. Based on the results of grinding experiments, numerical values of the work index Wi are calculated according to the formula ...

Ball mill power draw calculation Grinding Classification Circuits ...

Ball mill power draw calculation (1 reply and 1 comment) H. Hamid72. 5 years ago. Hamid72 5 years ago. Hello everybody. We have a ball mill in our plant with 2m diameter and 7 m length. I think that It is not a standard ball mill. Now I want to calculate the power draw of this ball mill and know how much must be the loaded ball in this ball mill.

How Steel Charge affects Ball Mill Power Draw Grinding ...

Yesterday I calculated the power draw of our ball mill. I attach a graph of it. Is it possible to have calculated mill power draw to be greater than mill motor HP? Calculated mill power draw is 1,509 HP; Mill motor HP is 1,500 HP According to the calculations, at 54% mill volumetric loading, max power draw of 1,796 HP is obtained.

Operating work index is not the specific energy consumption LinkedIn

To calculate the operating work index of a circuit, you must measure four things: P: The power draw of the mill. This is usually calculated from the input leads to the motor, then multiplied by ...

Charge behaviour and power consumption in ball mills: sensitivity to ...

Discrete element method (DEM) modelling has been used to systematically study the effects of changes in mill operating parameters and particle properties on the charge shape and power draw of a 5m ball mill. Specifically, changes in charge fill level, lifter shape (either by design or wear) and lifter pattern are analysed. The effects of changes to the properties of the charge (ball fraction ...

PDF Modeling the Specific Grinding Energy and Ballmill Scaleup Ntua

Ball mill power draw predicted from the Denver slide rule, kW 0 200 400 600 Calculated ballmill power draw from the m odel derived, kW Data compared Line y=x Fig. 2. Comparison of the ball mill power draw from the Denver slide rule and the proposed model. Dashed line corresponds to y=x.

Machining Power Calculator and Formulas Machining Doctor

Step 4 Converting the result to kW or HP. Assuming the input values are in Inches and KC is in KPSI the result should be divided by 400 to get the power in HP units. Assuming the input values are in millimeters and KC is in Mpa (N/mm 2) the result should be divided by 60,000 to get the power in kW.

Analysis of power draw in ball mills by the discrete element method

The ball load, at which the mill draws maximum power, is about 53%. The simulation results of mill running at 60% critical speed are plotted in Fig. 4. The relevant operating and simulation parameters are listed in Table 3. The calculated power draft is maximum at about 50% ball load.

Grinding Mill Power 911 Metallurgist

Thus the power to drive the whole mill. = + = = 86 kW. From the published data, the measured power to the motor terminals is 103 kW, and so the power demand of 86 kW by the mill leads to a combined efficiency of motor and transmission of 83%, which is reasonable.

AMIT 135: Lesson 8 Rod Mills Mining Mill Operator Training

The product size distribution is narrower than a ball mill but significantly coarser. Most are overflow discharge type. Lengthtodiameter= to Mill length = 7 meters. ... Bond quantified the rod mill power draw as a function of the Work Index, capacity, and a series of correction factors: PM = Wmtest,i FT Q. FT = F1 F2 F3 F4 F5 F6 .

Calculation of the power draw of dry multicompartment ball mills

Abstract. In this paper, a new approach for the calculation of the power draw of cement grinding ball mills is proposed. For this purpose, cement grinding circuit data including the operational ...

PDF GROSS POWER CALCULATOR SMC Testing

GROSS POWER CALCULATOR General . This model uses the equations from Morrell's 1993 PhD thesis: "The Prediction of Power Draw in Wet ... Predicted Power Draw (kW) Ball mills AG/SAG Mills. 5 Figure 2 Overflow Discharge Mill . Figure 3 Grate discharge mill . Figure 4 Lifter/liner. 6

Ball Mill Critical Speed Working Principle YouTube

https:// Learn about Ball Mill Critical Speed and its effect on inner charge movements. The effect of Ball Mill RPM s...

Bond Work Index FormulaEquation 911 Metallurgist

You can read all the details of this now "Biblical" grinding power requirement calculation formula in Fred Bond's original paper. ... Ball Mill Grindability Test was conducted by standard practice using 100mesh (150 pm) closing screens. The ball mill work index is shown below. BM Wi (kWhr/st) = ...

SAG Mill Power Model Grinding Classification Circuits ...

Prediction of correct sag mill power consumption with a change in ore hardness, solid percent (density) to the sag feed, rpm of sag and PSD has always been very tricky. So far, I have used AustinMorrell model and Hogg Fuerstenau power model, but these models seem to work well only under certain boundary conditions.

Rod Mill an overview | ScienceDirect Topics

The power needed to operate a rod mill could exceed 30% of the power used in a ball mill. When they are worn, rods must not stretch but break in rather small pieces, so that they can exit the mill. ... This information is correlated with the power draw of the mill and used to calculate the rate of addition of the new feed. It was found that the ...

Ball Mill Motor Power Draw Sizing and Design Formula 911 Metallurgist

Ball Mill Motor Power Draw Sizing and Design Formula. The following equation is used to determine the power that wet grinding overflow ball mills should draw. For mills larger than meters (10 feet) diameter inside liners, the top size of the balls used affects the power drawn by the mill. This is called the ball size factor S.

Ball Mill Design/Power Calculation LinkedIn

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 be fed 100 TPH of a material with a work ...