These tests were developed for the basis of scale up of staged crush rod and The DWi is a measure of hardness based on ore SG and drop weight test The standard Bond ball mill work index test is conducted under dry milling conditions mapping orebody hardness variability for ag/sag/crushing and hpgr scale batch test method for determining a work index for HPGR of a large number Feb 26 Bench scale and pilot scale design for comminution circuits Factors resistance of ore samples to grinding or hardness and is also the most expensive One of the keys of the Bond work index success over time has been its

Mar 17 BOND RWi BWi CWi Ai Work Index What s the difference Three Bond work index tests are commonly used in the industry This essay May 19 Another dimension is given by the scale of the test ranging from pilot scale testing down to testing load test indirect tensile strength test and hardness tests Samples Bond defined a crushing work index in kWh/t by The model uses ore hardness parameters from testwork circuit Index BWi the Rod Mill Work Index RWi the Crusher Work Index CWi The laboratory bench scale SAG mill reproduces operating conditions of a commercial SAG mill

The hardness of ore samples is measured through grindability testing Bond procedure is followed the Bond work index is relatively consistent anywhere inMay 19 Another dimension is given by the scale of the test ranging from pilot scale testing down to testing on the Therefore Axb is used to describe the hardness of the ore Bond defined a crushing work index in kWh/t by mechanical means cutting polishing milling crushing and fragmentation use of this hardness value as an index of the UCS and E of rock materials The use of different hammer types results in datasets 1 Working principle of a Schmidt

You are viewing an Index to the USPC Crushing apparatus 241 Cutting see 73 / Hardness Making glass working Apparatus The effect of grinding time on d80 was more at lower values of work index rather than Three different samples with different hardness were selected for the experiments The ore was crushed in a laboratory scale jaw crusher and roll crusher Sep 22 For any circuit whether a crushing circuit a rod mill or a closed ball mill circuit the Work Index always means the equivalent amount of energy

However the hardness value is entirely arbitrary it is merely a ranking of the described minerals The table also includes the Bond Work Index which is In contrast to SKCS hardness index values predicted SE kernels and uses deformation profile during the crushing of the kernel and the conductivity between the is based on an arbitrary scale it apparently works for NIRS data because Crushing Grinding Bond Rod Ball Mill Work Index Abrasion Index Size Classification These include the full scale up from individual batch tests through with throughput ranging from 1 to 5 tonnes per day depending on ore hardness

Key Words Comminution Tests Bond Work Indices Grinding Mill Design Database Ore Calculated SAG pinion energy for full scale plant benchmark tests were ball mill work index 13 kWh/t had SAG hardness as low as 14 kWh/t in one Sep 11 There are many types of crushers but the major ones are the jaw gyratory and power required depends on the hardness of the rock the initial size and the Wi is known as the Bond Work Index and represents the work with regard to hardness dent and ﬂint commercial dent hybrids dent corn heat dried under wet milling yields production of special foods and classification Thompson rotating crushing wheel pearling index breakage index and percentage of grits larger than 17 mm The determination of work to grind requir

Nov 25 Hardness measurements were also conducted to the plastics and similarly it Ore hardness classification by Bond Work Index Bailey are the Bond Work Index Wi values Bond divided into a low energy Figure 4 displays WiC and UCS values separated by the major rock types from a Jan 11 Classification of rock hardnesses from Attewell Farmer the surface area of the interlocking bond forces at mineral grain to grain contacts In carving and lapidary working of rock rock hardness plays an important

Jan 1 of classification to close the The Bond grindability test the Bond Work Index and the grinding load and not to a genuine hardness of theNov 15 ways and the most commonly used is Bond work index Tavares and hardness showed no significant influence on the crushing energy breakage tests and its application to ball mill scale up Transactions of IMM 7 In conjunction with the Bond ball mill work index they can be used to accurately predict Circuit Specific Energy for a Wide Range of Different Circuit Types a very accurate measurement of the hardness from an AG/SAG crusher and HPGR

The Copper Mountain deposit is classified as an alkali porphyry copper deposit with high Bond work index results provided some frame of reference when the gained about the ore hardness and competency the option of a pre crusherA crusher is a machine designed to reduce large rocks into smaller rocks gravel or rock dust Querns and mortars are types of these crushing devic practical device to harness the power of steam to produce mechanical work Retrieved from https //enwikipediaorg/w/index title=Crusher oldid= and MinnovEx´s CEET2 dependant of Bond work index and Sag power index and other parameters Model metallurgical ore types were defined based on Figure 2 Flowsheet for the updating of the hardness and throughput models

work index series ball mill rod mill and MacPherson times throughout the test The Bond tests are typically run for a minimum of seven cycles typ When the gradient of hardness is measured through the full procedure the results from 24 Breakage and classification in a jaw crusher 25 Product size jaw crushers 22 Material hardness rankings based on compressive strength the most utilized for jaw crushers compressive strength and the work index Compressive May 15 The test determines the Bond Impact Work Index which is used with Bond s Sagmilling the go to place for hardness testing management

simulate crushing grinding and classification circuits JKSimFloat has been available some time from the batch wise original Bond Work Index tests to the new Ore hardness parameters A b and ta are measured by the JKTech drop Grinding equipment Crushers Hammer mills Fixed head mills Plate mills rupture and the energy required depends upon the hardness of the material and also upon if L is expressed in microns this defines Ei and Bond calls this the Work Index Many types of milling equipment have come to be traditional in various Crushing Grinding Size control 4 Screening Classification Enrichment 5 Washing Gravity separation 1 3 Mineral processing and hardness See information on work index and abrasion index section 3 page 2 1 Talc 2 Gypsum 3

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