### Cement mill notebookSlideShare

Jan 07 2015 Specific power consumption for clinker/gypsum grinding in a ball mill should be approximately 3000 cm2 /g 24.4 kWh/t 3200 cm2 /g 26.8 kWh/t 3400 cm2 /g 29.4 kWh/t 3600 cm2 /g 32.0 kWh/t 3800 cm2 /g 34.7 kWh/t 4000 cm2 /g 37.5 kWh/t Note The specific power demand of large grinding units is 10 15 better than that of small mills 8.1

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secondary mill power that permits the range of vari ability samples to be processed according to whether a SAG Mill limiting condition i.e harder ore or a Ball Mill limiting condition i.e softer ore exists For example a ratio of 1 1.5 or up to 1 2 would indicate a trend away from processing harder ore types and

Chat Online### Starkey Associates Inc.Leaders in Comminution Design

SAGDesign testing provides SAG pinion energy grindability in kWh/t to within 5 from 152 to 1.7 mm and Bond Ball Mill Work Index on SAG ground ore from the SAG test on the same sample Starkey Associates uses the patented SAGDesign technology to calculate accurate mill sizes from measurements on a client s own ore samples.

Chat Online### Estimates of Electricity Requirements for the Recovery of

Large electrically driven ball mills used for grinding ore to a size suitable as feedstock to the Estimated electricity requirements for production of ore from a multi million t/yr block caving kWh per unit basis primarily the metric ton ton or troy ounce Data contained

Chat Online### FULLY AUTOGENOUS GRINDING AT UNKI MINE

KWh/t Unki ore 75 1906.18 57.56 18.2 150 1906.18 114.02 15.0 The above confirms that the design BWI for the primary ball mill is between 15 kWh/t and 18.2 kWh/t As will be shown later for sizing the primary mill motor the Bond method is used The design Bond Work Indices for the primary and secondary ball mills are 16.5 kWh/t and 20.5

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Ball end mills also known as ball nose end mills are used for milling contoured surfaces slotting and pocketing A ball end mill is constructed of a round cutting edge and used in the machining of dies and molds About MSC Events Press Releases Investor Relations

Chat Online### How to Make a Ball Mill 12 Steps with Pictures wikiHow

Aug 10 2020 Ball mills are a special instrument used to break up hard solids into a fine powder They are similar to rock tumblers in that the instrument is a rotating container filled with heavy balls to grind the substance into powder Ceramic material crystalline compounds and even some metals can be ground up using a ball mill.

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Example material grindability correlation with ball mill Evaluation of performance with help of Zeisel test Guiding values for the grindability of an OPC cement 95/5 are o 27 32 kWh/t at 3000 cm²/g acc Blaine o 39 47 kWh/t at 4000 cm²/g acc Blaine o 58 69 kWh/t at 5000 cm²/g acc Blaine Energy consideration in cement grinding

Chat Online### MODELING THE SPECIFIC GRINDING ENERGY AND BALL

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 not only D f d w i and T but also the mill operating conditions ρ f L and f c are known and assuming the value of the L/D

Chat Online### Bond Work Indexan overview ScienceDirect Topics

The measured BW i was 14.0 and 6.6 kWh/t for the medium/hard and soft ore respectively at a closing screen size of 106 μm compared with the simulated values of 13.2 and 5.6 kWh/t The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on

Chat Online### equipment to use to calculate KWh/tPage 1 of 1

Sep 06 2016 equipment to use to calculate KWh/t Good day What pieces of equipment should i use to calculate KWh/t My grinding system has a roll press ball mill and separator Should i used 1 Just the ball mill roll press separator separator fan and ball mill fan 2 All in 1 above including elevators 3 include everything in the system Reply

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Aug 18 2021 Bond ball mill work index kWh/t 8.0 JK DWT parameter A b 63.1 2.26 = 142.6 JK parameter ta 2.56 P95 in the product feed to ﬂotation mm 0.150 The ore in question is exploited in opencast mining The product from primary crushing common to all routes is characterized by a size distribution with a top size of

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Jan 19 2021 F80 in a SAG mill will require 29.5 kWh/t in the SAG mill When ball mill grinding is added an additional 12.3 kWh/t is needed to grind to a P80 of 74 microns to feed the process 0 10 20 30 40 50 60 70 80 90 100 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

Chat Online### The influence of mill speed and pulp density on the

mill weight during the test from the empty mill weight including the ball charge at the start of the test The pulp volume of the pulp in the mill is then calculated using the mill discharge density before dilution obtained during the kWh/T 6.56 6.54 KWh/t–75 µm 26.0 25.23 < 75 µm 27.0 28.0 F80 µm 4405 4157 P80 µm 400 390

Chat Online### SIMPLIFIED BOND WORK INDEX DETERMINATION By R O

kwh/t to reduce a given material from theoretically infinite feed size to 80 passing 100 microns The work index of a particular material is determined in the laboratory by conducting the standard Bond grindability test Bond developed separate tests for the rod mill and the ball mill The simplified test

Chat Online### Comparing ball and vertical mills performance An

seen the vertical mill consistently presented lower net specific energy consumption than the ball mills which operate on the same circuit The averages were 11.3 11.7 and 6.5 kWh/t respectively for ball mill 01 ball mill 02 and vertical mill Figure 5Net specific energy consumption of regrinding circuit.

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Chat Online### Bond Efficiency GMG ICE v1 r04 Determining the

kWh/t and WioACTis the Actual Operating Bond Work Index kWh/t If the Wi Efficiency Ratio is 1.0 or 100 the circuit is per forming with the same efficiency as the Bond Standard Circuit and the ore Wi = circuit operating Wi in accor dance with the correlation that Bond 1962 established between plant operating data and test data

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A 3.09 m diameter x 4.60 m EGL ball mill with a 550 kW variable speed drive VSD was chosen as the second ball mill and will operate in series downstream of the existing ball mill with 800 kW VSD The mill sizing relies on the BWi of 16.1 kWh/t 106 µm screen and a

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BM = Ball mill specific energy from T 80 1.7 mm to final product P 80 using Bond s Law kWh/t W T = Total grinding mill circuit specific energy kWh/t Note that K BM is the composite of EF3 EF4 and EF5 factors for ball milling Rowland 1982 Morrell and SMCC Morrell 2004 developed a methodology for predicting specific energy with

Chat Online### Energy Use of Fine Grinding in Mineral Processing

Dec 18 2013 where W is the specific grinding energy kWh/t W i is the Bond ball mill work index kWh/t F80 is the feed 80 pct passing size μm and P80 is the product 80 pct passing size μm It can be seen that in the regime in which the Bond equation is valid energy use increases exponentially as product size decreases with constant feed size

Chat Online### AG/SAG/Ball Mill

AG/SAG/Ball Mill Sizing Gross Power Draw and Specific Energy Calculator for Autogenous Grinding AG Semi Autogenous Grinding SAG and Ball Mills Exit Mill Calculator kWh/t Required when F 80 feed size is larger than transfer size Milling Circuit Arrangement P xx Passing size control

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Wet Ball Mill Wet type ball mill are mostly used in the industry production It is to increase the high grinding efficiency under the ball mill grinding and striking from which the granularity is even and no flying dust with little noise being the most universal powder machine in the benefication as powder grinding the ferrous metal like gold silver plumbum zinc copper molybdenum

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BALL MILL Specification Number A Process Data Sheet xxxx xxx xxx Sheet No 1 of 2 Area xxx Client Operating Centre Jakarta No 1 Working 1 Service ROM Ball Mill Item No 1 of Standby 0 xxxx ML 001 2 Manufacturer Model Type and Number 3 OPERATING CONDITIONS 4 MATERIAL HANDLED Crushed Ore 5 Hazard Considerations Yes X No Type 6 DESIGN CONDITIONS FEED PRODUCT

Chat Online### Energy Use of Fine Grinding in Mineral Processing

Dec 18 2013 where W is the specific grinding energy kWh/t W i is the Bond ball mill work index kWh/t F80 is the feed 80 pct passing size μm and P80 is the product 80 pct passing size μm It can be seen that in the regime in which the Bond equation is

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Mar 20 2017 where P80 and F80 are the 80 passing sizes of product and feed in microns and Wi is expressed as kWh/t The calculated power requirement is adjusted by utilizing efficiency factors dependent on the size of mill size and type of media type of grinding circuit etc to give the operating power requirement Ball Mills The final stages

Chat Online### SAGDesign Test Starkey and Associates Inc.

The SAG mill pinion energy W SDT kWh/t and SAG discharge Bond ball mill work index S d BWI kWh/t are then used to calculate the total energy to grind the ore from 80 passing 152 mm to 80 passing the client specified final product size P 80.This information along with the ore specific gravity is used to calculate necessary mill sizes and motor power in industrial applications.

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Chat Online### t10 63 x 53 The SCSE Parameter the JK Drop Weight A

of the mill kWh/t is determined The specific energy is mainly a function of the ore hardness A and b values the feed size and the dimensions of the mill specifically the aspect ratio as well as to a 0 10 20 30 40 50 60 70 80 90 100 0 0.5 1 1.5 2 2.5 3 3.5 4 t10 Ecs kWh/t Weighted Fit 63 x 53 45 x 37.5 31.5 x 26.5 22.4 x 19 16 x

Chat Online### Optimization of mill performance by using

difference up to 10 on the energy kWh/T for a similar grind Optimization of mill performance by using online ball and pulp measurements J o u r n a l P a p e r The Journal of The Southern African Institute of Mining and Metallurgy VOLUME 110 NON REFEREED PAPER MARCH 2010 135 Table I Influence of speed and liner design on load dynamics

Chat Online### Morrell Method GMG ICE v01 r01 Morrell method

Wc Specific energy for conventional crushing kWh/t Wh Specific energy for HPGRs kWh/t Wi Bond Work Index Ws Specific energy correction for size distribution kWh/t WiBM Bond Ball Mill Test Work Index kWh/t 3 KEYWORDS Autogenous Grinding AG Ball mill Bond Work Index Wi Comminution circuit High Pressure Grinding Rolls HPGRs Rod

Chat Online### ENERGY SAVINGS AND TECHNOLOGY COMPARISON

FIG 2Specifi c breakage rate of Millpebs versus 25 mm media in ball mills Application Ore Type BWI kWh/t F80 μm Bond Ball Top Size Millpebs Energy Savings Finer Grind Secondary ball mill Cu Zn Pb 12.0 93 8 mm 100 36 Same Regrind ball mill Cu Pb 12.0 30 5 mm 100 37 Same Regrind ball mill Cu Zn Pb 10.0 40 5 mm 100 40 Same

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