# fred bond ball mill power draw equations

• ### AMIT 135 Lesson 7 Ball Mills CircuitsMining Mill

Equations for mill sizes less than 3.81meters in diameter and greater than 3.81meters were proposed t/h D < 3.81 m t/h D > 3.81 m Wet Ball Mill Power Draw (Bond) For wet ball mills Bond expressed power draw as a function of the total mass of media Pâ†"M / Mâ†"B

• ### AMIT 135 Lesson 7 Ball Mills CircuitsMining Mill

Equations for mill sizes less than 3.81meters in diameter and greater than 3.81meters were proposed t/h D < 3.81 m t/h D > 3.81 m Wet Ball Mill Power Draw (Bond) For wet ball mills Bond expressed power draw as a function of the total mass of media Pâ†"M / Mâ†"B

• ### Metcom TrainingMetcom Technologies

To determine the actual mill power draw and volumetric load of your mill from plant readings and measurements. 4. Work Index Efficiency To determine the Work Index calculations for evaluating grinding circuit efficiency as initially developed by Mr. Fred Bond. 5. Functional Performance of Ball Milling To determine ball mill circuit performance

• ### Bond formula for the grinding balls size calculation

2017-10-19 · There is a mathematical solution to this problemthe Bond formula. It uses to help determine the grinding media optimal size must be loaded into the ball mill for proper operation ensure. The calculation formula is below Bthe grinding balls diameter mm Athe correction factor (for grinding balls A = 20 17 for cilpence A = 18 15)

• ### Orway Mineral Consultants Canada Ltd. Mississauga ON

2014-10-1 · Presently power-based equations remain the principal method for designers to size mills and power draw. The most frequently used power-based methodologies for calculating energy requirements for submitted to the Bond ball mill work index test. The number of SAG mill revolutions required to grind the material to a P

• ### Rod Mill Design Power Draw911 Metallurgist

2015-10-19 · Power draw is related directly to mill length and empirically to the diameter to the power 2.34. Theoretically this exponent should be 2.5 (Bond 1961). Power draw is directly related to mill speed (in r.p.m. or fraction of critical speed) over the normal operating range.

• ### Dynamic Modelling of Temperature in a Wet Ball Mill Based

2019-9-1 · The mill measured 7.3 m diameter by 9.6 m long. Under normal operating conditions the mill ball filling is 30 of total mill volume mill speed is 75 of critical speed solids concentration in slurry is 75 solids feed rate is 330 tph and rated power draw is 9500 KW.

• ### Relationships between comminution J energy and

2015-4-16 · Throughout the batch grinding tests the power draw of the mill was measured using a purpose built power meter to facilitate the calculation of specific grinding energy. Results Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS. The concentrate weight

• ### (PDF) MODELING THE SPECIFIC GRINDING ENERGY AND BALL-MILL

The proposed model combined with a model giving the ball-mill power draw is used for the ball-mill scale up. Comparisons with the Bond procedure showed a good agreement for the prediction of the

### Power-based comminution calculations using Ausgrind

(JKDWT) "A b" and the Bond ball mill work index. The SAG and ball mills power draw is calculated using semi-empirical equations as a function of mill geometry speed and load.

• ### (PDF) MODELING THE SPECIFIC GRINDING ENERGY AND BALL-MILL

The proposed model combined with a model giving the ball-mill power draw is used for the ball-mill scale up. Comparisons with the Bond procedure showed a good agreement for the prediction of the

• ### Pontificia Universidad ólica de Chile

2009-4-8 · The Bond_Op. Work Index spreadsheet was designed to estimate the Operational Work Index of a given grinding installation of known dimensions and operating conditions based on the traditional Bond s Law and the Hogg Fuersteneau Power Model (see Mill Power_Ball Mills spreadsheet for further details on such model).

• ### Metcom TrainingMetcom Technologies

To determine the actual mill power draw and volumetric load of your mill from plant readings and measurements. 4. Work Index Efficiency To determine the Work Index calculations for evaluating grinding circuit efficiency as initially developed by Mr. Fred Bond. 5. Functional Performance of Ball Milling To determine ball mill circuit performance

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### Power-based comminution calculations using Ausgrind

(JKDWT) "A b" and the Bond ball mill work index. The SAG and ball mills power draw is calculated using semi-empirical equations as a function of mill geometry speed and load.

• ### Dynamic modelling and simulation of semi-autogenous mills

2009-1-1 · The equation used to predict the power consumed by the mill (power-draw) M p is based on a modification of Bond s Law (Austin 1990) (3) M p = K p · D 2.5 · L (1-A · J) W V ϕ c 1-0.1 2 9-10 ϕ c where D (m) and L (m) are the mill dimensions V (m 3) is the mill effective volume ϕ c is the mill speed (fraction of critical speed) J is

• ### Orway Mineral Consultants Canada Ltd. Mississauga ON

2014-10-1 · Presently power-based equations remain the principal method for designers to size mills and power draw. The most frequently used power-based methodologies for calculating energy requirements for submitted to the Bond ball mill work index test. The number of SAG mill revolutions required to grind the material to a P

• ### Engineering Sustainability of Mechanical Recycling of

2016-5-18 · is the comminution power (CP) in Watts consumed by ball milling machine 𝑃 is the mill power draw for running at no load and t is the total machining time in sec. The CP requirement can be specified 13 as shown in Equation (2). 𝑃 =W BCEF FGF FMD RREF SSF MT EF1 EF2 EF3 (2) Where W=Basic power required BCEF = Ball

• ### Using modelling and simulation for the design of full

1997-12-1 · This model was then used to predict the net power draw of the Bond mill The resultant prediction of the new power draw of the Bond mill was 86.65W which is comparable to Levin s 19 value of 86.4W. From the full scale mill dimensions and operating conditions the net mill power draw was predicted using the JKMRC power model 12 .

• ### fred bond ball mill power draw equations

fred bond ball mill power draw equations ..h to calculate the Relationships between comminution J energy and product and empirical energysize reduction equations The test work involved Bond ball mill testing the power draw of the mill was measured using a purpose built Grinding Mill Computer Model AusIMMRowling are used to calculate the mill power draw.

• ### Alex DollPrincipal ConsultantAlex G Doll Consulting

2020-12-9 · Procemin 2013 October 17 2013. SAG Mill power draw models are used in mill design and grinding circuit modelling to predict. how much power will be consumed by a particular mill geometry and operating configuration. This paper will compare SAG mill models by Morrell Loveday (using "Power Numbers" published.

Title Consultant at SAGMILLING.COM
• ### Comparison between bond crushing energy and fracture

2015-4-22 · predict the power draw of mills with reasonable accuracy over a wide range of mill diameters2 3. More than 10 years since then the DEM technique has been successfully applied to ball mills4–7 SAG mills8–10 and centrifugal mills11 12. DEM has also been applied to study impact-induced particle breakage. Using DEM simulation of impact

• ### Size Reduction and Energy RequirementScienceDirect

2016-1-1 · A Bond ball mill work index is then performed on the mill product for the design of SAG-ball mill circuits. This is important because it was found that there was a 1–1.5 kWh/t higher ball mill work index if the –3.35 mm ball mill test feed size is obtained by SAG mill grinding compared with crushing.

• ### (PDF) MODELING THE SPECIFIC GRINDING ENERGY AND BALL-MILL

The proposed model combined with a model giving the ball-mill power draw is used for the ball-mill scale up. Comparisons with the Bond procedure showed a good agreement for the prediction of the

• ### Modelling the influence on power draw of the slurry phase

2016-4-1 · If one looks back over the last 70 years or so there is a fairly common theme to most of tumbling mill power draw models (Bond 1961 Hogg and Fuerstenau 1972 Arbiter and Harris 1982 Austin 1990).This is that the models used the charge shape shown in Fig. 1 in which it was assumed that all particles moved with same rotational rate and that the slurry phase was not explicitly considered.

• ### Bond formula for the grinding balls size calculation

2017-10-19 · There is a mathematical solution to this problemthe Bond formula. It uses to help determine the grinding media optimal size must be loaded into the ball mill for proper operation ensure. The calculation formula is below Bthe grinding balls diameter mm Athe correction factor (for grinding balls A = 20 17 for cilpence A = 18 15)

• ### 20150821 Morrell Method-GMG-ICE-v01-r01 Morrell

2020-9-24 · Power draw of the comminution equipment (kW) •In the case of mills the power draw should be repre- and the Bond Ball Mill Work Index Test (GMG 2016a). The Morrell s equations can be used to predict the overall specific energy of most com-minution circuit configurations. Full details of

• ### SAGMILLING.COM . . Articles

Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh

### Fine Grinding a Refresheronemine

2017-1-1 · "Many power-based grinding models exist and most operators are familiar with Fred Bond s ""third theory"". Bond s model is most commonly used to describe primary and secondary grinding to product sizes above for example 100 µm. They can be fit to any type of mill including stirred and tumbling ball mills.IntroductionBuilding a case for

• ### MODELING THE SPECIFIC GRINDING ENERGY AND BALL

2021-2-24 · 21 CONCLUSIONS Continued In the present work equations were also derived giving zthe ball-mill power drawP as a function of its dimensions internal mill diameter D and length L zthe ball-mill power drawP as a function of the feed D f (mm) and the product size d (mm) the Bond work index w i (kWh/short ton) and the mill throughput T (short ton/h) zthe ball-mill dimensions (D and L) when

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