microns up to the P80 of the product of the last stage of crushing or HPGR size reduction prior to grinding. "Fine" covers the size range from a P80 of 750 microns down to P80 ... 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 image above represents the specific power of mill. To calculate the specific power of mill, three essential parameters are needed and these parameters are Work Index of Ground Material (w i), 80% Product Size (P 80) and 80% Feed Size (F 80).. The formula for calculating the specific power of mill:

In Grinding, selecting (calculate) the correct or optimum ball size that allows for the best and optimum/ideal or target grind size to be achieved by your ball mill is an important thing for a Mineral Processing Engineer AKA Metallurgist to do. Often, the ball used in ball mills is oversize "just in case". Well, this safety factor can cost you much in …

For a great presentation on How to Interpret Particle Size Distribution Data D50 D80 D90 and D10 you need to

Explain the role of ball mill in mineral industry and why it is extensively used. Describe different types of ball mill design. ... P80 = 0.1mm; Calculate the mill size required to handle the desired throughput: Solution: W = 10*11.25(1/√100 – 1/√100 0) kWt/t = …

how to calculate sag mill ball charge. Calculate the Bond specific energy of each ball mill test E ball = 10 Wi P80 0.5F80 0.5 If you are going to use Morrell equations then also calculate the Morrell specific energy for each ball mill test E ball = 4 Mib P80 0.295 P80 10 6F80 0.295 F80 10 6 Fit the specific energy results for all BM tests E ...

mesh (1.7 mm) ensuring that the ball mill will work efficiently. Coarser screens than 10 mm will cause serious losses in ball mill efficiency. Ball mill feed must never exceed 80% passing 3 mm if reasonable ball mill efficiency is expected. The practice of using ½ inch screens (trommels) is an encroachment on this limit and is perhaps the most

Using a calculator an those 2 simple tools will get you a fast P80 or Pxyz. This great simple tool/method lets you estimate the grind size of any stream using a wet vibrating screen (single deck) and a Marcy …

Calculate the Bond specific energy of each ball mill test, E ball = 10 × Wi (P80-0.5 - F80-0.5). If you are going to use Morrell equations, then also calculate the Morrell specific energy for each ball mill test, E ball = 4 × Mib (P80-0.295-P80×10^-6 - F80-0.295-F80×10^-6). Fit the specific energy results for all BM tests, E ball = K × P 80-a.

I would like to know the effect of ball mill cyclone overflow density on P80 of 150um. I ask this because at either higher or lower densities, you can get your P80 @ 150um (at least 80% passing 150um). Kindly advise on what densities would …

The fitted equation, in metric form, is given as Equation (1). 80 - the 80% passing feed particle size (μm). According to GMG (2021), the feed preparation for the ball mill …

P80 value from Ball Mills = 100 US mesh = 150 m (Grinding Plant Product, i.e. Cyclones overflow) Estimate of total required power (TKW): ... F80 = 50mm 28,000 tdp 8500kw 2500kw T80 = 600µm p80 = 140µm CalCulaTe: • Mill filling • Trajectory • Ball size • Ball consumption • Mill power

grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability The sample was crushed to passing 6 mesh (3.35mm), from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill. A feed particle size analysis was performed to determine feed P80 and % …

compared to those from the ball mill circuit. This has often resulted in conclusions concerning lower energy efficiencies of AG/SAG mill circuits compared to ball mills. The correlation between the AG/SAG and ball mill circuit data is also very poor. Use of equation 2 shows a very different picture, the results being illustrated in Figure 7.

Cytec Handbook. Why have a large circulation load:. If a product all finer than a certain critical size is required, the capacity of the ball mill is increased considerably by using it in closed circuit with a classifier and this increase is made still greater by increasing the circulating load in between the ball mill and the classifier (Fig. 70).

The Hydrocyclone Efficiency Curves are affected by many operating factors such as feed density, apex and vortex sizes and feed pump pressure.

The grinding-product size, P, in a Bond ball mill, ... These functions for G and P enable us to calculate the value of Wi for any other size of grinding product if we know the work index Wi and aperture size of the screen Pk. INTRODUCTION The energy consumption for grinding, according to Bond (1961), is deter- mined by the formula: / 10 …

P80) is varied. Rules for the Mib are no different. Hence it is explicitly assumed that the Wib value that is used has come from a Bond ball mill work index test that has generated a similar value to that input to the "Tumbling mill circuit product P80- final grind" field. If this is not the case the resultant

Under given load and particle size requirement, capacity is a function of mill length and diameter: Q = kLD 2+N. N is related to mill diameter which decreases with larger diameters k a constant equal to π /4. A chart showing rod mill capacity vs. mill diameter [image: (135-8-5)] A chart showing rod mill capacity vs. mill length

Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done: Add about 500 g of silica sand into the mill containing the ball charge. Seal the mill. Rotate for 20 revolutions to …

Explain the role of ball mill in mineral industry and why it is extensively used. Describe different types of ball mill design. ... P80 = 0.1mm; Calculate the mill size required to handle the desired throughput: …

Since there are not that many small SAG mill operations of under 2000 TPD, and most sub-2000 TPD mills are built with rod mills and/or ball mills only; the upstream crusher plant needs to have sufficient crushing power to provide a P80 to grinding of typically <1.5″ (40 mm) and often as finely crushed as <3/8″ (9 mm).

An analysis of the kinetics of dolomite grinding in a dry ball mill reveals that the following approximations apply for the parameters of the batch grinding model: the size discretized selection ...

1. A power-based method is first utilised to determine the required ball mill power consumption to achieve the required product P80. This would give the required ball mill …

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 ...

1. A power-based method is first utilised to determine the required ball mill power consumption to achieve the required product P80. This would give the required ball mill power in closed circuit with cyclones operating at 250% circulating load. 2. Adjustment of the ball mill power to account for effect of higher classification efficiency of ...

The ball mill grindability test is used for describing ore hardness and it is so widespread that the Bond Work Index generated from the test is often referred to as an ore characteristic. ... considering only the first three grinding cycles. After the third cycle, G (g/rev) and P80 are determined and used to calculate the Bond work index via ...

Ball mills can grind a wide range of materials, including metals, ceramics, and polymers, and can operate on a variety of scales, from laboratory to industrial (Monov et al. 2013). The produced ...

For a particular circuit feed rate, key variables that affect the circuit grind size distribution (Proxy P80) are described below: • Design variables: Variables attributed to hydrocyclone dimension and internal design, such as cone angle and vortex finder length.

Here this Ball Mill Design Calculator. Where the finished product does not have to be uniform, ... Ball Mill Grinding P80 Size. The mesh of grinding usually lies between 48 and 200 mesh. On account of their size in relation to that of the bubbles, particles larger than 48 mesh generally have too great a tendency to drop out of the froth …