bond work index ball mill calculation pdf design and safety factors

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 can be used to determine

two Results of Bond ball mill tests conducted with closing screens of 75 µm or finer are to be treated with caution The Bond Work Index relationship has been noted to apply down to approximately 70 m and perhaps no finerµ without making qualifications Calculations First calculate the actual Operating Work Index WloACT of the

Ball Mill Wio BWio 86 Circuit Wio OWio 146 Bond Ball Mill Work Index BWi kWht 134 Bond Rod Mill Work Index RWi kWht 181 Table 1 Example of AGSAG Ball Mill Circuit Wio Calculations 1 2 ABstrAct Optimum use of power in grinding both in terms of grinding efficiency and use of installed capital can have a large effect on

Ball mill design requires a Bond work index BWi for ball mills at the correct passing size SAG mill design requires an appropriate SAG test for example SPI Chapter 5 Flotation design needs a valid measure of kinetics for each sample including the maximum attainable recovery and rate constants for each mineral Chapter 12

A quick method for bond work index approximate value determination Article PDF Available in Physicochemical Problems of Mineral Processing 531321332 · January 2017 with 7441 Reads

Hello Everyone I am dealing with the calculation of Bond Work Index The flowsheet is attached I have calculated primary ball mill bond index but for the calculation of second ball mill bond index I got trouble In a bond energy equation where should I select tonnage and where should I pick

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 12″ ore samples in a Ball Mill using a standard ball charge Below describes in general terms the Bond Work Index Procedure used by a Professional Metallurgical Testing Laboratory

See this useful summary Table of Bond Work Index by Minerals 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 to reduce one ton of the ore from a very large size to 100 um

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

Mill Selection The first step in mill design is to determine the power needed to produce the desired grind in the chosen ore The most used equation for this purpose is the empirical Bond equation Bond 1960 1961 Rowland and Kjos 1978

OMC POWERBASED COMMINUTION CALCULATIONS FOR DESIGN MODELLING AND CIRCUIT OPTIMIZATION P Scinto A Festa B Putland submitted to the Bond ball mill work index test The number of SAG mill revolutions required to grind the EF4 and EF5 factors for ball

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 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

Determination of Bond Work Index of Lucky Cement Limestone Pakistan Niaz Muhammad Shahani Zhijun Wan Abdullah Rasheed Qureshi Muhammad Ali Naseem Ali AbstractThe Bond work index is a research methodology which is widely used for the estimation of power required to grind the materials

Calculation of energy required for grinding in a ball mill Int J Miner Process 25 4146 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

2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALLMILL SCALEUP Ballmill scale up Bond’s LawData 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 capacity Mill dimensions from Tables or charts

PDF Ausgrind is Ausencos inhouse program used for powerbased comminution calculations Bond ball mill work index 171 kWht Ball SPI or SAGDesign tests are used to measure the ore

two Results of Bond ball mill tests conducted with closing screens of 75 µm or finer are to be treated with caution The Bond Work Index relationship has been noted to apply down to approximately 70 m and perhaps no finerµ without making qualifications Calculations First calculate the actual Operating Work Index WloACT of the

Circulating Load Formula Of Ball Mill circulating load calculation in ball mill Circulating Load Calculation FormulaHere is a formula that allows you to calculate the circulating load ratio around a ball mill and hydrocylone as part of a grinding circuit For example your ball mill is in closed circuit with a set of cyclones circulating load calculation in ball mill

Design Construction and Performance Analysis required for the specific power calculation was assumed to be the work index of limestone which is 116 KWht with a specific gravity of 26 gcm 3 or 2600 kgm 3 The Since for the ball mill design we are using 80 passing

The energy efficiency of ball milling in comminution Request PDF equation used by them for the ball mill work index Bond work index is as Get Quote ball mill grinding calculation Hammer Crusher Hammer Crusher ball mill grinding process calculations offers 269 small mineral grinder products Home calculations for design

geous for being based on the Bond work indexes that are determinable in any wellfitted ore pretreatment laboratory it is UDC 622732 O I SKARIN RIVS Science and Production Association N O TIKHONOV JV “IVS” CALCULATION OF THE REQUIRED SEMIAUTOGENOUS MILL POWER BASED ON THE BOND WORK INDEXES O I SKARIN Senior Researcher

capacity calculation of ball mill Ball Mill DesignPower Calculation The basic parameters used in ball mill design power calculations rod mill or any tumbling mill sizing are material to be ground characteristics Bond Work Index bulk density specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum ‘chunk size’ product

in developing the SPI and SAGDesign tests The bond Ball Mill Work Index test was developed using feed carefully prepared to 100 minus 6 mesh 3 mm and about 80 passing 12 mesh US It is also true that the Bond BM Wi test has been used for over 50 years as the industry standard way to design Ball mills

Grinding in ball mills is an important technological process applied to reduce the size of particles which may have different nature and a wide diversity of physical mechanical and chemical characteristics Typical examples are the various ores minerals limestone etc The applications of ball mills are ubiquitous in mineral

For overflow ball mills the charge should not exceed 45 of the mill volume For grate discharge mills the charge should occupy about 50 of the mill volume Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge He and the radius of the mill R ie