Bond Work Index Procedure and Method
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 A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains Int J Miner Process , 165 ( 2017 ) , pp 8 14 , 101016/jminpro201705011A new approach to the calculation of bond work index for This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on ‘around the world sample’ You can find the SG of each mineral samples on the other table Source 1 Bond Work Index Tester by David Michaud May 13, 2021 June 19, Table of Bond Work Index by Minerals
Bond Work Index an overview ScienceDirect Topics
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 310), a question arises as to whether this practice will alter the ball mill work index (BW i) of the material This is because work index frequently changes as a function of the product size in comminution If target grind size during a project is changed, or if the test is run at the wrong product size, then it is necessarily to provide a correction The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basisCorrection of Bond Ball Mill Work Index Test for Closing Bond Work Index (BWI) Hardgrove Grindability Index (HGI) tests for biomass coal • BWI can predict the potential for mill choking of biomass in a tube and ball mill • HGI is a poor method of predicting grindability of biomass in vertical spindle mills • Pellets should be composed of predensified particles close to the target size •Investigation into the applicability of Bond Work Index
Bond Index Ball Mill / Rod Mill BT 100 XL RETSCH
The Bond Index conforming rod charge consists of: 6 rods of 125“ diameter and 21“ length 2 rods of 175“ diameter and 21“ length The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a waveshaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill You need a twostage solution, first stage opencircuit mill and then second stage closedcircuit mill First stage, will be broken into two parts as well, you use a Bond rod mill work index for the coarse component of the ore (+21 mm) and the Bond ball mill Bond Work Index (Energy equation) Grinding 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 kilowatthours per short ton required to break from infinite size to a product size of 80% passing 100 µm If the breakageCORRELATION BETWEEN BOND WORK INDEX AND
A new approach to the calculation of bond work index for
A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains Int J Miner Process , 165 ( 2017 ) , pp 8 14 , 101016/jminpro201705011An alternative mill ball charge is proposed that closely approximates Bond's original total ball mass, number of balls and ball surface area Results of 30 Bond Work index tests of six pure materials (calcite, magnesite, labradorite (feldspar), quartz, andalusite and glass) using closing screen apertures (P 1) values of 500, 250, 125, 90 and 63 A Bond Work index mill ball charge and closing screen This is because work index frequently changes as a function of the product size in comminution If target grind size during a project is changed, or if the test is run at the wrong product size, then it is necessarily to provide a correction The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basisCorrection of Bond Ball Mill Work Index Test for Closing
Investigation into the applicability of Bond Work Index
Bond Work Index (BWI) Hardgrove Grindability Index (HGI) tests for biomass coal • BWI can predict the potential for mill choking of biomass in a tube and ball mill • HGI is a poor method of predicting grindability of biomass in vertical spindle mills • Pellets should be composed of predensified particles close to the target size •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 method described in this paper, which is used at Anaconda Research Center to approximate the work index, is an alternative procedure to Determination Of The Bond Work Index Using An Ordinary The Bond work index is one of the most useful and interesting parameters used in designing grinding equipment However, it must be obtained under restrained conditions, especially in regards to the Bond standard lab mill The main objective of this study is to show how this index can be obtained using a Denver ball mill, which is present in most mineral processing laboratories The methodology Determination of work index in a common laboratory mill
Bond Index Ball Mill / Rod Mill BT 100 XL RETSCH
The Bond Index conforming rod charge consists of: 6 rods of 125“ diameter and 21“ length 2 rods of 175“ diameter and 21“ length The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a waveshaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod millFIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 05 1 15 2 WiRM/WiBM (metric) Siddall et al (1996) identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore’s compentency Figure 8 plots this ratio versus UCS; no trend is apparent Comparison of UCS to Bond Work Indices WiBM Bond Ball Mill Test Work Index (kWh/t) Wic Bond Impact Crushing Test Work Index (kWh/t) WioACT Actual Operating Bond Work Index determined from measurements on the circuit (kWh/t) WiRM Bond Rod Mill Test Work Index (kWh/t) WiSTD Standard Circuit Bond Work Index (expected or designed) used for circuit design Specific energy requirement at Bond EfficiencyGMGICEv1r04 Determining
GMSG GUIDELINE: DETERMINING THE BOND
Bond Test WI’s (kWh/t): Rod Mill: Ball Mill: 95 kWh/t8 9 kWh/t Bond Standard Circuit Work Index: Assume the rod mill Work Index of 95 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 An alternative mill ball charge is proposed that closely approximates Bond's original total ball mass, number of balls and ball surface area Results of 30 Bond Work index tests of six pure materials (calcite, magnesite, labradorite (feldspar), quartz, andalusite and glass) using closing screen apertures (P 1) values of 500, 250, 125, 90 and 63 A Bond Work index mill ball charge and closing screen 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 method described in this paper, which is used at Anaconda Research Center to approximate the work index, is an alternative procedure to Determination Of The Bond Work Index Using An Ordinary
Procedure for determination of ball Bond work index in
The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball milling This happens after 7–10 grinding cycles, which shows that the procedure is a lengthy and complex one and is therefore susceptible to This is accomplished by the standardization of mill dimensions, tumbling speed, grinding ball charge weight and distribution, sample ore charge weight in the mill and operating practice The results of this investigation reveal that the Bond work index grindability values may differ substantially with different standard Bond ball millsReproducibility Of Bond Work Index With Different The Bond work index is one of the most useful and interesting parameters used in designing grinding equipment However, it must be obtained under restrained conditions, especially in regards to the Bond standard lab mill The main objective of this study is to show how this index can be obtained using a Denver ball mill, which is present in most mineral processing laboratories The methodology Determination of work index in a common laboratory mill
Comparison of UCS to Bond Work Indices
FIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 05 1 15 2 WiRM/WiBM (metric) Siddall et al (1996) identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore’s compentency Figure 8 plots this ratio versus UCS; no trend is apparent Rowland, CA, 1978, “Determination and use of operating work indices in controlled grinding circuits–A proposed concept,” Mill Operator’s Conference and Exhibit, Northwestern Branch, Australasian Institution of Mining and Metallurgy, Mt Isa, Queensland Australia, JuneUsing the Bond work index to measure operating 22 Ball Mill Batch Process The mill dimensions, (D × L), are 0204 × 0158 m and it is loaded with 65 kg steel balls between 25 and 32 mm in diameter The mill rotates on rolls and its frequency is set to 70 RPM (1667 Hertz) corresponding to A New Approach to the Calculation of Work Index and
Relationships between comminution J energy and
Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS The concentrate weight recovery was in the order of 50–60% Furthermore it may be observed that the Bond ball mill work indices for the ore (Wi) varies from 146 to 209 kWh/t 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 17 mm is used to predict AG/SAG specific energy using quation 4 Correction E factors for feed size and pebble ing are applied to Orway Mineral Consultants Canada Ltd Mississauga, ON