# ball mill operatng work index calculation ### O. I. SKARIN N. O. TIKHONOV CALCULATION OF THE

work index RWI; for finer particles — ball milling work index BWI (Table). These indexes are readily obtained using the special-purpose laboratory equipment (Fig. 1). Finding the total specific energy consumption in the wet autogenous mill — central discharge ball mill circuit (WAM — CDBM) In the framework of the discussed method, total

Get Price ### Operational work index for grinding plants

The on-line calculation of either the rod mill operational work index or the overall plant operational work index W iog requires the feed size f 80, which is not measured on-line. A sensitivity analysis is made to assess the influence of f 80 and p 80 in the determination of the work index.

Get Price ### A study of simulating the calculation method of the Bond

SIMULATING THE CALCULATION OF THE BOND ROD-MILL WORK INDEX Afterthe parameterskl, n 1, k' and n' are obtained,the mathematical models of simulating the calculation of the Bond rod-mill work index can be written as follows.In the firstcycle: where C, is the ratio of the circulating load.In the ith cycle (i a 2): with the ending conditions: 150 Table2.

Get Price ### Effect of circulating load and classification efficiency

Figure 2 Closed circuit ball mill flowsheet classification before milling (secondary ball mills) 1 1 C1 C2 Q2 2 E2 KQ (3) Q1 1 1 C2 C1 2 E1 The relative capacity of closed ball mill circuits at varying circulating load is compared to a base case with 250% circulating load and 50% classification efficiency (typical for classification with

Get Price ### Evaluation Index of Ball Mill Grinding Work

In practical work, operating rate, productivity, specific productivity, grinding efficiency, and technology index are often taken as the standard to evaluate the quality of the grinding work. 1. Operating Rate. Ball mill operating rate is the ratio, which the actual time of operating is to the total hours' calendar during the work.

Get Price ### Alternative Approaches for Determination of Bond Work

was screen analyzed and the last three net grams per revolution (Gbp) is the ball mill grindability. The test mesh used was 100 mesh (150 m) [10-17]. The Bond Work index Wi was calculated from the following equation (Eq. 1) Wi = 44.5/(P1) 0.23 X (Gbp)0.82 [10/(P 80) 1/2 – 10/(F 80) 1/2] (Eq.1) Where

Get Price ### CORRELATION BETWEEN BOND WORK INDEX AND

The Bond's standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 m. If the breakage characteristics of a material remain constant over all size ranges, the calcul ated work

Get Price ### O. I. SKARIN N. O. TIKHONOV CALCULATION OF THE

10 mm), the crushing work index SWI is applicable; for me-dium size particles (from 100 mm to 2100 μm) — rod milling work index RWI; for finer particles — ball milling work index BWI (Table). These indexes are readily obtained using the special-purpose laboratory equipment (Fig.

Get Price ### calculation of ball throughput tonnages

calculate ball mill throughput in closed circuit Calculation Of Ball Throughput Tonnages - . Obtain the circuit throughput rate (dry tonnage). Calculate the Actual Operating Bond Work Index of whether a crushing circuit, a rod mill, or a closed ball mill

Get Price ### Bond Work Index Formula

power draw of AG/SAG and ball mills. Note that the ball mill operating work index is applied only on the portion that needs the additional grinding (Q2), which renders to the AG/SAG mill the credit for the fraction of the material that had been already ground to final product (Q1). To calculate the operating work indices, equations  and  must be solved.

Get Price ### CALCULATION OF MAXIMUM BALL SIZE FOR BALL MILL

Jun 25, 2018Mill effective diameter = 2.23 m . 335 is a constant used for dry grinding with steel balls in the mill. Actual size of media is taken is lower than the calculated value. It is around 80 to 90 mm. If you Wants to reduce the maximum ball size, thenreduce the feed size by using pre-grinding operation.

Get Price ### THE EFFECT OF BALL MILL OPERATING PARAMETERS ON

developed the well known Bond work index which is an indicator of a materials resistance to crushing and grinding. Each of these theories was useful in the design and scale up of' ball mill operations, however they told little of the expected size distributions, and most importantly gave no indication of liberation.

Get Price ### ball mill capacity calculation on the basis of feed size

Ball Mill Design/Power Calculation - LinkedIn. Dec 12, 2016 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 index of 15 and a size ball mill feed capacity calculations - residenzasanmichele

Get Price ### ball mill design calculation

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

Get Price ### how to calculate p80 ball mill

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 . Get Price →

Get Price ### ATTRITORS AND BALL MILLS HOW THEY WORK Robert E.

Ball mills work well on hard, brittle materials. They are not as suitable for grinding elastic, ductile or fibrous materials, or for fine grinding in general. Ball mills can blend and grind at the same time, yielding a fine, intimate mixture. Conventional ball mills are usually limited to

Get Price ### Calculate a Mill's Operating Work Index

Calculate a Mill's Operating Work Index. As defined, this value should never exceed , but in some cases – particularly in Grate Discharge Mills – it could be lower than . Note that this interstitial slurry does not include the overfilling slurry derived from the difference between the Charge and Ball Filling.

Get Price ### SPECIFIC COMMINUTION ENERGY

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 specific energy prediction accurate might be compromised.

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Mill Capacity Calculations. There are a large number of formulae for the calculation of the capacity of a milling tandem. Hugot gives the following formula: A = 0.9 cn√N(1-0.06nD)LD2/f. where. c. is a factor dependent on the cane preparation equipment, c. = 1.3 if the tandem is preceded by a shredder.

Get Price ### ball mill operatng work index application

Ball Mill Operatng Work Index Calculation loscugnizzo ball mill operatng work index calculation. ball mill grinding calculation, calculation of ball filling ratio in grinding mill. calculation of energy required for grinding in a ball mill the bond work index, wi, as an indicator of the grindability of raw materials is not a material constant but rather it

Get Price ### MODELING THE SPECIFIC GRINDING ENERGY AND BALL

zFrom the distribution of the points around the line of comparison the good agreement of the results received is obvious. 0 200 400 600 Ball mill power draw predicted from the Denver slide rule, kW 0 200 400 600 Calculated ball-mill power draw from the m odel derived, kW. Data compared Line y=x. Fig.

Get Price ### ATTRITORS AND BALL MILLS HOW THEY WORK Robert E.

the mill. The common range of mill speeds is 65% to 80% of critical, depending on mill type, size and the application. The critical speed of a ball mill is calculated as 54.19 divided by the square root of the radius in feet. The rotational speed is defined as a percentage of the critical speed. Smaller diameter mills

Get Price ### JKTech Laboratory Services

The standard Bond Ball Mill Work Index test procedure is firstly to stage crush the feed to minus 3.35mm, and size a representative sample. The test then involves a series of batch grinds in a standard Bond mill. A Bond mill is 0.305m by 0.305m, with rounded corners, a smooth lining, and runs at 70rpm.

Get Price ### Grinding in Ball Mills: Modeling and Process Control

Grinding in ball mills is an important technological process applied to reduce the the work index of the material, the mill shaft power and depending on the type of the mill, the operating conditions and the type of the material being ground.

Get Price ### End Mill Speed and Feed Calculator

Martin Chick Associates CNC Programming Services. Phone - (440) 251-4290 Resources. Speed And Feed Calculators Ball Mill Finish Calculator Part Spacing Calculator G And M Code Characters Standard End Mill Sizes Standard Drill Sizes Drill And Please fill out the form below with feeds and speeds that work for you and I will place them

Get Price ### Using the Bond work index to measure operating comminution

Key words: Comminution, Bond work index, Grinding, Crushing, Ball mills, Rod Mills. Theoretical efficiency In their book Process Engineering of Size Reduction - Ball Milling, Austin, Klimpel and Luckie (1984) stated that, We have tried throughout this book to avoid the use of the term grinding efficiency because the degree of conversion of

Get Price ### Bond Ball Mill Index Test

Bond Ball Mill Index Test. The Bond Ball Mill Work Index can be used in the design calculations and simulations using JKSimMet of a new grinding circuit. A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample Requirements: A minimum of 10 kg

Get Price ### AMIT 135: Lesson 8 Rod Mills – Mining Mill Operator Training

Introduction. Rods are 150mm shorter than the mill length. Breakage occurs more from cascading than cateracting. The product size distribution is narrower than a ball mill but significantly coarser. Most are overflow discharge type. Length-to-diameter= 1.4 to 2.3. Mill length = 7 meters.

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80 sizes typically reached by conventional ball milling. The delineating size between coarse and fine grinding is 750 m. SMC test results are used to determine the Drop Weight Index (DWi) and the coarse ore grinding index (M ia). Test data from the Bond ball mill work index test is used to calculate the fine grinding index (M ib). The M ia and M

Get Price ### calculation for ratating ball mill

ball mill calculation data in pdf - grinder. More information of ball mill calculation data in pdf ball mill rpm calculation, introduction to the mill mit ball end mills dynamic sfpm/ipm cnczone the largest More; calculation of grinding media charging ball mill ball mill grinding media calculation.

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