2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALL-MILL SCALEUP Ball-mill scale up Bond s Law Data zBond work index w i zFeed D f and product d size both 80 cumulative passing Result The specific grinding energy w Mill power draw P = wT where T the mill

Calculation of energy required for grinding in a ball mill Author links open overlay panel N M Magdalinovi 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 in

Ball Mill Wio BWio 8 6 Circuit Wio OWio 14 6 Bond Ball Mill Work Index BWi kWh t 13 4 Bond Rod Mill Work Index RWi kWh t 18 1 Table 1 Example of AG SAG Ball Mill Circuit Wio Calculations 1 2 ABstrAct Optimum use of power in grinding both

submitted to the Bond ball mill work index test The number of SAG mill revolutions required to grind the material to a P 80 of 1 7 mm is used to predict AG SAG specific energy using quation 4 Correction E factors for feed size and pebble ing are applied to the

The aim of this study was to develop a new method for assessing the Bond work index in a ball mill BBWI which is based on a first order kinetics present in the Bond ball mill for grinding mineral raw materials Austin et al 1981 Ahmadi and Shahsavari 2009

ball mill work index was averaging only 11 6 kWh t which is not hard A rod mill work index ﬁ gure was not found but was thought to be in the 16 kWh t to 18 kWh t range The Xstrata Zinc 22 ft ID × 40 ft EGL over ow ball mill ﬂ was installed at Mt Isa in 2009

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

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 of 80 passing ¼ inch 6350 microns The required product size distribution is to be 80 passing 100

Quick method for bond work index approximate value determination 331 The newly formed undersize mass for the first grind ing It provides the Bond Ball Mill Work Index which expresses the

Calculation of energy required for grinding in a ball mill Int J Miner Process 25 41-46 The Bond work index Wi 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

Similar to a Comparative Work Index this test is an open circuit dry batch grindability test run in the standard Bond Ball Mill for a set time It can be used at mesh sizes from 65 to 200 mesh normally 100 mesh The test requires calibration against the standard

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 Bond Work Index For Limestone Clinker Grinding Mill Bond Work Index Table for Post Lab …Grinding of materials in a tumbling mill with the presence of metallic balls or other media … 1961 Crushing and Grinding Calculations … More detailed

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

18 5 2013· This video was put together by Joshua Wright and Aldo Vasquerizo as a supplemental lecture for University of Nevada Reno If you have any questions need advice or need to conduct a …

The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill see Figure 3 10 a question arises as to whether this practice will alter the ball mill work index BW i of the material

Ball Mills What Are These Machines and How Do They Work Short flash video at bottom of page showing batch ball mill grinding in lab May have to click on …

index by calculation is almost matching with measured Bond s work index The Bond s work These studies were carried out in a standard ball mill 300 mm X 300 mm size The grinding media with steel balls weighing 20 125 Kgs has been used The details

Generally Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power In the current research a simple fast and accurate procedure is introduced to find the

based on the Grinding Software Presentations available The Cement Grinding Office 2015 - Presented by Marc Piccinin Quantity of material inside the ball mill Calculation with example Residence time inside the mill Material and retention time Calculator

This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples These equation application methods are used to process 1 2″ ore samples in a Ball Mill using a standard ball

19 6 2015· The effect of Ball Mill RPM speed going from sub-critical to super-critical helps understand the Ball Mill Working Principles of ball-on-ball VS ball-on-shell grinding The Motion of the Ball Charge

Measuring ore grindability in balls mills The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill It can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions

A New Approach to the Calculation of Work Index and the Potential Energy of a Particulate Material Elias Stamboliadis Stamatis Emmanouilidis Evangelos Petrakis Technical University of Crete

JKTech Laboratory Services Bond Ball Mill Index Test BRMWI A Bond Ball Mill Index Test BBMWI is a standard test for determining the Ball Mill Work Index of a sample of ore The BBMWI is a measure of the resistance of the material to crushing and grinding It