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ball Mill work index calculation xls gold ore

ball Mill work index calculation xls gold ore

Table of Bond Work Index by Minerals

2015-6-19  Source 4: Tenova Bateman mills (AG/SAG, Rod, Ball Mills) Source 5: Doering international GmbH cylpebs Source 6: SME handbook of mineral processing, N.L Weiss Editor, NY 1985. Bond Work Index Tester

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Application of Operating Work Indices in Autogenous ...

The uncorrected transfer size is, on average, 2.5 times larger than the equivalent transfer size. The uncorrected ball mill operating work index is, on average, 75%of the value of the BWi, while the corrected ball mill operating workindex is, on average, similar to BWi.

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Ball Mill Design/Power Calculation

2015-6-19  Ball Mill Power Calculation Example #1 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

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Small Ball Mill Capacity Sizing Table

2016-2-14  Use these 2 tables to get you close. No BWi Bond Work Index required here BUT be aware it is only a crude approximation for “most soft ores” from F80 1 cm to P80 700um. Ball mill design power example calculation. Calculate Ball Mill Grinding Capacity.

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Metallurgist Mineral Processing Engineer

2016-12-19  The Bond_Mill Sizing spreadsheet was designed to determine the most appropriate mill dimensions and operating conditions for a given grinding task (known ore properties plus desired mill throughput and feed and product sizes), based on the traditional Bond's Law and the Hogg Fuersteneau Power Model (see Mill Power_Ball Mills spreadsheet for ...

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QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE

2016-12-27  others in Allis-Chalmers have developed a grinding test in a ball mill in a closed cycle until the establishment of stable recirculating load (Maxson et al., 1933). The Bond work index is a parameter which represents a measure of an ore resistance to grinding. Numerically, the work index represents the energy (kWh/sht)

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Design, Construction and Performance Analysis of a 5 ...

2017-8-4  The laboratory ball mill was designed for grinding limestone, meaning that the work index required for the specific power calculation was assumed to be the work index of limestone, which is 11.6 KWh/t, with a specific gravity of 2.6 g/cm. 3. or 2600 kg/m. 3. The feed size (F. 80) of the ball mill was assumed to be 2 mm (2000 microns).

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A Method of C alculating Autogenous/ Semi

2018-2-20  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

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Design, Construction and Performance Analysis of a 5 ...

2017-8-4  The laboratory ball mill was designed for grinding limestone, meaning that the work index required for the specific power calculation was assumed to be the work index of limestone, which is 11.6 KWh/t, with a specific gravity of 2.6 g/cm. 3. or 2600 kg/m. 3. The feed size (F. 80) of the ball mill was assumed to be 2 mm (2000 microns).

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

2018-2-20  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

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A New Approach to the Calculation of Work Index and

2013-12-24  The mill dimensions, (D × L), are 0.204 × 0.158 m and it is loaded with 6.5 kg steel balls between 25 and 32 mm in diameter. The mill rotates on rolls and its frequency is set to 70 RPM (1.667 Hertz) corresponding to 85% of the critical frequency. The mill power is P = 16.2 Watts, calculated by the formula provided by Stamboltzis [7]. PMN

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20150505 Bond Efficiency-GMG-ICE-v1-r04 Determining

2020-9-24  1. Calculate the Actual Operating Bond Work Index of the grinding circuit. • Estimate the F80 and P80. • Calculate the work or specific energy input from the size reduction equipment power and circuit tonnage (equation 1). Auxiliary equipment power is excluded. P W = ––– (1) T

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Calculation of energy required for grinding in a ball mill ...

1989-1-1  The Bond work index, W i, as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding product.Therefore, in practice we can expect some difficulties and errors when the energy consumption is determined according to this formula in the case when, for a given size of grinding product, the value of the work index W i ...

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Ball Mill Used in Minerals Processing Plant Prominer ...

This ball mill is typically designed to grind mineral ores and other materials with different hardness, and it is widely used in different fields, such as ore dressing, building material field, chemical industry, etc. Due to the difference of its slurry discharging method, it is divided to two types: grid type ball mill and overflow type ball mill.

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Ball Mill Design/Power Calculation - LinkedIn

2016-12-12  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 microns).

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ausimm

2021-6-24  Mill Charge Content, % Overall Weight, tons Volume, m3 (app) Area, m2 # Balls per ton (*) (*) Neglecting scrap size. ESTIMATE OPTIMAL BALL MAKE-UP SIZE BASED ON AZZARONI's 3rd GENERATION FORMULA. Speed (% Critical) (rpm) Eff. Diameter Eff. Length Ore Properties : Ore Density ton/m3 Work Index KWH/ton (metric) Recommended Ball Make-up Size ...

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Operational work index for grinding plants - ScienceDirect

2000-1-1  The operational work indices: W~oR for the rod mill and W~oBj for each ball mill - hydrocyclone section are given by (Rowland, 1973)" PeR PeBj W,oR = Gz Gkj 11.02 FrR k# - P~o 11.02 FrB k8o~ - Pso~ Commution, Classification and Agglomeration C4-3 Here FTR and FTB are particular application and equipment-related factors, depending on the ...

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how to calculate mining mill work index - piccolina.pl

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).

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Orway Mineral Consultants Canada Ltd. Mississauga, ON ...

2014-10-1  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 ib indices are used to calculate specific energy for the coarse (W a) and fine (W b) components of the total grinding specific energy at the pinion (W

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Work Index Determination for High Pressure Grinding Rolls

cycle test akin to the Bond Ball mill work . index determination. The first cycle starts with minus 6 mesh ore removed since it is believed that the fines content can fill most of the voids allowing little room for rock breakage and piston movement. Without adequate piston

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Small-Scale Tests to Characterise Ore Grindibility

to that of the ball mill test, as follows: It is common to observe a difference between the rod mill and ball mill values for a given ore type. These differences may be caused by a variation in ore hardness by size (12.5mm for RWI and 3.35mm for BWI), and/or grain size properties. The Bond rod mill work index is used to calculate the power ...

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ausimm

2021-6-24  Mill Charge Content, % Overall Weight, tons Volume, m3 (app) Area, m2 # Balls per ton (*) (*) Neglecting scrap size. ESTIMATE OPTIMAL BALL MAKE-UP SIZE BASED ON AZZARONI's 3rd GENERATION FORMULA. Speed (% Critical) (rpm) Eff. Diameter Eff. Length Ore Properties : Ore Density ton/m3 Work Index KWH/ton (metric) Recommended Ball Make-up Size ...

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CORRELATION BETWEEN BOND WORK INDEX AND

2014-6-27  the work index depending on the grind size. In this way, work index values are usually obtained for some specific grind size that characterizes the grinding operation to design or under evaluation. This study was carried out in a standard bond ball mill 305 mm x 305 mm size

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Pontificia Universidad Católica de Chile

2009-4-8  M = Fresh Ore Throughput (not including Circulating Load), ton/hr. P = Net Mill Power Demand, kW. Bond's Work Index may be estimated directly from operational data (whenever available) from back-calculation of the first equation above. In such case is denoted as the Operational Work Index :

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A Methodology to Estimate Ores Work Index Values, Using ...

It is always attempted to reduce the costs of comminution in mineral processing plants. One of thedifficulties in size reduction section is not to be designed properly. The key factor to design size reductionunits such as crushers and grinding mills, is ore’s work index. The work index, wi, presents the oregrindability, and is used in Bond formula to calculate

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Bond Grinding Circuit Efficiency - ceecthefuture.org

2018-2-20  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 INDEX EFFICIENCY DETERMINATIONS! 10. 2/20/2014 6 Example SAG-Ball Mill Circuit WI ...

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Operating work index is not the specific energy consumption

2018-10-24  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

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

The proposed model correlates the specific grinding energy, the clinker work index and the specific surface (Blaine) of a cement produced through fine-grinding in ball mills.

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