The method requires all the elements of the ball mill work index test to be filled in: Ball mill Wi test closing screen size, umclosing, µm; Ball mill Wi test product size, P 80, µm; Ball mill Wi test feed size, F 80, µm; Ball mill Wi grams per revolution at test conclusion, gpr; Required parameters F 80, µm is the 80% passing size of the ,

Get Priceball mill size distribution data showed that the CSE at 106 µm increased from 55 to 71 percent, also a factor of 129 , 450 (base survey) 1000 536 82 618 , No 2, the test work index of the ore and the operating work index of the circuit were essentially equal During

Get PriceThe rationale of the Bond work index was the crack theory that the length of the new fracture produced by the ore grinding was proportional to the input energy According to the requirement of the Bond work index, the standard work index ball mill (ฮฆ305 ร 305 mm) has no liner plate

Get PriceCorrection of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P80 close to desired grind size

Get PriceWhere: Wi is the Bond Ball Mill Work Index P 80 is the comminution step product size F 80 is the comminution step feed size Because there is no difference in energy consumption in the SAG mill and the Ball mill in the above noted adjustment size range, the T80 can be adjusted to give a desired power split between the SAG mill and the Ball mill

Get PriceThe above confirms that the design BWI for the primary ball mill is between 15 kWh/t and 182 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 165 kWh/t and 205 kWh/t respectively

Get PriceNov 01, 2018· Where E = energy required per mass of feed W = Bond Work Index work required to reduce a unit weight d, , 212 EDGE RUNNER MILL Method of size reduction: , In Ball Mill, maximum size ,

Get PriceAn improved method using less mass compared to the bond ball mill work index testthe jk bond ball mill (jkbbm) test, is a locked cycle grindability test conducted using a standard laboratory bond ball mill with the same steel ball charge and material feed size ( passing 335 mm) as the bond ball mill work index test

Get PriceBond Index In Vertical Roller Mill Power Calculations Pdf Performance Evaluation Of Vertical Roller Mill In, It was concluded that vertical roller mill circuit has an advantage over conventional ball milling circuit in terms of energy consumption bond work indices and and calculating the rates Bond Index In Vertical Roller Mill Power Calculations

Get PriceThe kinetics of grinding on 80% passing size of product d80 was studied for two grades of coal namely lignite and bituminous using Box-Behnken method of surface response experiment The bond grindability index and work index of the ball mill were determined

Get PriceMay 19, 2013· This video was put together by Joshua Wright and Aldo Vasquerizo as a supplemental lecture for University of Nevada RenoIf you have any questions, need advi,

Get PriceThe results from the SMC Test are used to determine the drop-weight index โ a measure of the strength of the rock as well as the comminution indices Mia, Mih, and Mic In conjunction with the Bond ball mill work index, they can be used to accurately predict the overall specific energy requirements of circuits containing AG and SAG mills, ball ,

Get Priceleast with the balls used in the mills in the data base , From 21mm to the final grind size the ball mill work index should be , Application of Bondโs Method to Estimate Ball Mill

Get Priceparticle size are calculated and the Bond ball work index is then calculated using the standard Bond ball work index formula: ๐๐= 445 ๐023๐๐๐082[10 โ๐80 10 โ๐น80] [2] where W i represents the Bond ball work index, F 80 and P 80 are the feed and product particle sizes,

Get PriceApr 02, 2020· Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P80 close to desired grind size

Get PriceFor the simplified Bond method, an approximate work index may be determined by running a batch dry-grinding test The test was performed using a 25 cm diameter tumbling ball mill with material hold-up of about 10%, media loading of about 25% and a unit interstitial filling Two kilograms of the 5 mm lignite samples were ball-milled for 10 ,

Get Priceโข Equipment sizing and selection , (JK drop weight tests, Bond ball mill work index tests, Piston press tests and HPGR pilot tests, etc) and in analyzing survey samples , for a 3000 t/d Pb-Zn mill by using a similar processing method Show more Show less Student internship-Team leader Hunan Chenzhou Mining Industry Corp Jul 2011 โ Aug ,

Get PriceThe corresponding Bond Ball Mill Work Index data from the same tests is plotted in Figure 2 Fig 2 - Bond Ball Mill Work Index Vs Cum Dist% of Samples Tested 0 10 20 30 40 50 60 70 80 90 100 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 Bond Ball Mill Work Index, kWh/t d Soft Ore Hard Ore

Get PriceThe test work program was carried out on those five ore samples obtained from the copper-porphyry orebodi Total of 38 Bond work index tests, including duplicates, were done Standard Bond ball mill test procedure were carried out on crushed (-335 mm / 6 mesh) material at different

Get PriceThe basis for ball mill circuit sizing is still B ondโs methodology (Bond, 1962) The Bond ball and rod The Bond ball and rod mill tests are used to determine specific energy c onsumption (kWh/t ,

Get PriceThis is a SAG or AG mill model that estimates the specific energy consumption (E SAG) using the equations of Morrell (2004) Testwork Required The SMCโข test, stored in the "DWT" testwork table (SMC is a Drop Weight Test) Bond ball mill work index The method requires all the parameters of the ball mill work index test to be filled in:

Get PriceMoly-Cop Tools, Version 3 0 About the Bond_Op Work Index Spreadsheet , Scope : The Bond_Op Work Index spreadsheet was designed to estimate the Operational Work Index of a given grinding installation of known dimensions and operating conditions, based on the traditional Bond's Law and the Hogg & Fuersteneau Power Model (see Mill Power_Ball Mills spreadsheet for further details on such ,

Get PriceDec 23, 2013· Practical 1: Title: Ball Milling Objective: To grind the coarse salt to a smaller size by using a ball mill and to obtain the particle size distribution of the initial and the sieved final mixture Introduction: 'Ball milling is a method used to break down the ,

Get Pricecycle 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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Get PriceThe grinding jar for the Bond Index Rod Mill is 12โณ x 24โณ in size and has a wave-shaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 21 mm whereas Ball Mill Work ,

Get PriceGrinding capacity calculation of ball millalculation of energy required for grinding in a ball mill alculation of energy required for grinding in a ball millntinerrocess25 41 46he 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

Get Price= Bond laboratory ball work index (kWh/tonne) P 1 = closing screen size in microns Gbp = net grams of screen undersize per mill revolution P = 80% passing size of the product in microns F = 80% passing size of the feed in microns Circuit Equipment Configurations โ Although the model can be used for a very wide range of

Get PriceHowever, if the sample is to be prepared by cutting with a diamond saw (cut-core method) as little as 5kg is normally sufficient Also remember that the products from the SMC Testยฎ can be re-used for Bond ball work index testing, the SMC Testยฎ being effectively used as a feed preparation step for the Bond ball work index test

Get PriceBond ball mill grindability test for overflow wet ball mills An approach was proposed by Erdem (2002) for dry multi-component cement grinding ball mills, using the results of the Bond ball mill grindability test For all model based methods, a reliable method to calculate mill power draw for a

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