# ball mill operatng work index effeciency

### Operating work index is not the specific energy consumption

Oct 24, 2018 The work index can either be measured in the laboratory (the Bond ball mill work index determination is a common example) or it can be calculated from the operating performance of a milling ...

More### Investigating of the effect of ore work index and particle ...

Apr 01, 2016 The amount of feed was set at 1175 g, which was proportional to industrial scale.The ball mill speed was constantly set at 76.8% Cs.Experiments were conducted at different ball sizes (between 20 and 40 mm), grinding time (10–30 min), solids content (65–80%) and work index of copper sulphide ore (12–15.4).RSM and Box–Behnken design were used for the experimental design and modeling of ...

More### MODULE #5: FUNCTIONAL PERFOMANCE OF BALL MILLING

In the prerequisite module entitled "Work Index Efficiency", you have learned about work index analysis* to define overall grinding circuit efficiency. In rod milling, you can use work index analysis to relate design and operating variables to overall circuit efficiency. However, you cannot use work index analysis for the same purpose on ball mill

More### Factors Affecting Ball Mill Grinding Efficiency

Apr 22, 2018 The following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency: a) Mill Geometry and Speed – Bond (1954) observed grinding efficiency to be a function of ball mill diameter, and established empirical relationships for recommended media size and mill speed that take this factor into account.

More### How to Improve Ball Mill Performance

Oct 25, 2017 Ball mill circuit classification system performance is considered here first because it provides the basis for subsequent characterization of ball mill breakage efficiency. Major design and operating variables in closed circuit ball milling of a specified feed to a desired product size are summarized in Table 1.

More### Bond Grinding Circuit Efficiency

Mill Ball Mill Closed circuit crushing to 16 mm Open circuit 8’ dia. rod mill to 1 mm Closed circuit 8’ dia. ball mill to P80 um The ore Test Work Index = Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK ...

More### How to Measure Grinding Efficiency

Apr 20, 2018 The first two Grinding Efficiency Measurement examples are given to show how to calculate Wio and Wioc for single stage ball mills. Figure 1. The first example is a comparison of two parallel mills from a daily operating report. Mill size 5.03m x 6.1m (16.5′ x 20′ with a ID of 16′).

More### ball mill operatng work index calculation

Ball Mill Operatng Work Index Effeciency Operating Work Index Is Not The Specific Energy Consumption. Oct 24 2018 The work index can either be measured in the laboratory the Bond ball mill work index determination is a common example or it can be calculated from the operating

More### ball mill operatng work index calculation

Ball Mill Operatng Work Index Effeciency. Operating Work Index Is Not The Specific Energy Consumption. Oct 24 2018 The work index can either be measured in the laboratory the Bond ball mill work index determination is a common example or it can be calculated from the operating

More### MODULE #5: FUNCTIONAL PERFOMANCE OF BALL MILLING

In the prerequisite module entitled "Work Index Efficiency", you have learned about work index analysis* to define overall grinding circuit efficiency. In rod milling, you can use work index analysis to relate design and operating variables to overall circuit efficiency. However, you cannot use work index analysis for the same purpose on ball mill

More### Bond Grinding Circuit Efficiency

Mill Ball Mill Closed circuit crushing to 16 mm Open circuit 8’ dia. rod mill to 1 mm Closed circuit 8’ dia. ball mill to P80 um The ore Test Work Index = Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK ...

More### Improved characterisation of ball milling energy ...

Jan 15, 2018 Two surveys of the ball mill operating at different conditions found that milling efficiency could be improved by 20%. These results highlight the importance of the mills operating conditions on energy efficiency as they can overwhelm the potential benefits of HPGR pre-conditioning.

More### Operational work index for grinding plants - ScienceDirect

Jan 01, 2000 Work indices obtained from operating data on any mill can be compared to grindability test results. The operating work index, Wiop, can be obtained using Bond's equation by defining W as the specific energy being used (power draw/new feed-rate), f80 and p80 as the actual feed and product 80% passing sizes, and Wi as the operating work index, Wiop.

More### ball mill operatng work index calculation

Ball Mill Operatng Work Index Effeciency. Operating Work Index Is Not The Specific Energy Consumption. Oct 24 2018 The work index can either be measured in the laboratory the Bond ball mill work index determination is a common example or it can be calculated from the operating

More### Using the Bond work index to measure operating comminution ...

Using the Bond work index to measure operating comminution efficiency C. A. Rowland 1 Mining, Metallurgy Exploration volume 15 , pages 32 – 36 ( 1998 ) Cite this article

More### (PDF) A SUMMARY OF ENERGY EFFICIENCY OPPORTUNITIES FOR

It is found that the target SABC circuit achieves the highest overall energy efficiency when 37.6% of the total circuit energy is distributed to the SAG mill and 62.4% to the ball mill.

More### 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 distribution of 80% passing ¼ inch (6350 ...

More### (PDF) A quick method for bond work index approximate value ...

In this work, the energy and exergy analyses of a cement ball mill (CBM) were performed and some measurements were carried out in an existing CBM in a cement plant to improve the efficiency of the ...

More### USING THE SMC TEST® TO PREDICT COMMINUTION

work index covering grinding of fine particles is labelled M. ib (Morrell, 2008). M. ia. values are provided as a standard output from a SMC Test ® (Morrell, 2004. a) whilst M. ib. values can be determined using the data generated by a conventional Bond ball mill work index test (M. ib. is NOT the Bond ball work index). M. ic. and M. ih ...

More### GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY

Bond Test WI’s (kWh/t): Rod Mill: Ball Mill: 9.5 kWh/t.8 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ

More### A Method of C alculating Autogenous/ Semi-Autogenous ...

rod mill work index has not been de ned as yet. The ball ﬁ mill work index is con rmed at 16 kWh/t. The operating ﬁ work index, though, is in the range of 21 kWh/t to 25 kWh/t showing high inefﬁ ciency. This raises the point that, in some cases, the Bond EF4 oversize factor calculation is not suf cient to compensate ﬁ

More### The Science of Comminution

- Efficiency Factors 7 - Operating Work Index 8 - Limitations of the Bond Test 9 - Single Particle Tests 9 - Bond Impact Test 9 - Drop Weight Test 10 - Mill Speed 10 - AG Mills 10 - SAG Mills 10 - Rod Mills 10 - Ball Mills 11 - Linear and Speed Effects 11 - Fines Correction 11 -

More### Bond Work Index - an overview ScienceDirect Topics

The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100% passing 3.36 mm (6 mesh) to product size in the range of 45-150 µm (325-100 mesh), thus determining the ball mill work index (Wi B or BWi). The work index calculations across a narrow size range are conducted using the appropriate laboratory work ...

More### Improved characterisation of ball milling energy ...

Jan 15, 2018 Two surveys of the ball mill operating at different conditions found that milling efficiency could be improved by 20%. These results highlight the importance of the mills operating conditions on energy efficiency as they can overwhelm the potential benefits of HPGR pre-conditioning.

More### Operational work index for grinding plants - ScienceDirect

Jan 01, 2000 Work indices obtained from operating data on any mill can be compared to grindability test results. The operating work index, Wiop, can be obtained using Bond's equation by defining W as the specific energy being used (power draw/new feed-rate), f80 and p80 as the actual feed and product 80% passing sizes, and Wi as the operating work index, Wiop.

More### Using the Bond work index to measure operating comminution ...

Using the Bond work index to measure operating comminution efficiency C. A. Rowland 1 Mining, Metallurgy Exploration volume 15 , pages 32 – 36 ( 1998 ) Cite this article

More### Bond Work Index - an overview ScienceDirect Topics

The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100% passing 3.36 mm (6 mesh) to product size in the range of 45-150 µm (325-100 mesh), thus determining the ball mill work index (Wi B or BWi). The work index calculations across a narrow size range are conducted using the appropriate laboratory work ...

More### 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 distribution of 80% passing ¼ inch (6350 ...

More### Optimization of mill performance by using

charge motion. It is well known that ball milling efficiency varies during the lifetime of the shell liner. For instance, the mill performance could become worse or better by putting in a new shell liner. Data from pilot plant test work illustrates the influence of the shell lifting effect on the grind for a

More### (PDF) A SUMMARY OF ENERGY EFFICIENCY OPPORTUNITIES FOR

It is found that the target SABC circuit achieves the highest overall energy efficiency when 37.6% of the total circuit energy is distributed to the SAG mill and 62.4% to the ball mill.

More### The Science of Comminution

- Efficiency Factors 7 - Operating Work Index 8 - Limitations of the Bond Test 9 - Single Particle Tests 9 - Bond Impact Test 9 - Drop Weight Test 10 - Mill Speed 10 - AG Mills 10 - SAG Mills 10 - Rod Mills 10 - Ball Mills 11 - Linear and Speed Effects 11 - Fines Correction 11 -

More### USING THE SMC TEST® TO PREDICT COMMINUTION

work index covering grinding of fine particles is labelled M. ib (Morrell, 2008). M. ia. values are provided as a standard output from a SMC Test ® (Morrell, 2004. a) whilst M. ib. values can be determined using the data generated by a conventional Bond ball mill work index test (M. ib. is NOT the Bond ball work index). M. ic. and M. ih ...

More### Taking Control of the Mill Feed R2

also reveals that the circuit is limited at the SAG mill, with spare power in the ball mill. Table 2: Power analysis of survey data Power Utilisation Units Survey 1 Survey 2 SAG Mill Specific Energy kWh/t 12.4 14.5 Ball Mill Specific Energy kWh/t 9.7 11.2 Operating Work Index (Wio) kWh/t 27.1

More### (PDF) Analysis of ball mill grinding operation using mill ...

The multi-segment ball mill model developed by Whiten and Kavetsky has been used together with an extensive range of data from operating mills to establish the parameters of a new ball mill model ...

More### Metcom Expertise - Metcom Technologies

We showed you how to calculate your grinding circuit's Operating Work Index in Grinding Bulletin No. 5: "What exactly is "Work Index" and how can I make use of it?" In this basic example, the Operating Work Index was calculated to be 14.4 kWh/t. The Bond Ball Mill Test Work Index of the ore was measured to be 15.8 kWh/t. Then, taking Work Index ...

More### Ball Mills - Mine Engineer.Com

Ball Mills are generally used to grind material 1/4 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being recirculated back into the mill to be reduced.

More### Ball mill grinding - Ramkrishna - SlideShare

Observation Total height of ball mill = 67 inch = 5.58 ft Height of Ball + Feed material = 54 inch = 4.5 ft Empty space = 13 inch = 1.08 ft Percentage of Fill level = 54/67*100 = 80.59% Percentage of Empty space = 19.41% Fill level The load of the ball is usually a little more than half of the volume of the mill. Generally 2/3 volume of the ...

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