Table of Bond Work Index by Minerals
Source 1: Table of materials reported by Fred Bond Source 2: Outokumpu, The science of comminution Source 3: Equipment and pipelines Source 4: Tenova Bateman mills (AG/SAG, Rod, Ball Mills) Source 5: Doering international Source 6: SME handbook of mineral processing, N.L Weiss Editor, NY 1985. Bond Work Index Tester
A public Database of tumbling mill grindability ...
• WiBM – The Bond ball mill work index, in metric units. • WiRM – The Bond rod mill work index, in metric units. • WiC – The Bond impact crushing work index, in metric units. • Density – The coarse particle density measured in either the Bond impact crushing …
Alternative Approaches for Determination of Bond Work ...
As a fast method, the determination of the Bond index from the Hardgrove index (by calculation) is almost matching with measured Bond's work index. The Bond's work index of the above rock samples calculated from the Hardgrove index value has shown a variation from 7.7 to 10.3 kWh/sh.t.
Application of Operating Work Indices in Autogenous ...
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 in terms of grinding efficiency and use of installed capital, can have a large effect on ...
Estimation of the Specific Energy Requirement for Size ...
Design engineers generally use Bond Work Index and Bond energy equation to estimate specific energy requirements for ball milling operations. Morrell has proposed different equations for the Work Index and specific energy, which are claimed to have a wider range of application. In this paper an attempt has been made to provide a comparison of these two approaches …
Bond Work Index - Determination of the Bond Work Index of ...
Determination of the Bond Work Index of Ores A.J.C.Taguiam Department of Mining, Metallurgical and Materials Engineering University of the Philippines, Diliman [email protected] Abstract The Bond work index refers to the measure of a material's hardness or resistance to crushing and grinding, and is numerically expressed as kilowatt hours per short ton.
QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE …
micrometers in size. According to the Bond standard procedure, the work index is determined by simulating a dry grinding in a closed circuit in the Bond ball mill to achieve 250% circulating load (Bond, 1949, 1952, 1961). The test is performed on a raw material approximately weighing 10 kg, which coarseness is -3.327 mm.
20150505 Bond Efficiency-GMG-ICE-v1-r04 Determining the ...
Where, WioACTis the Actual Operating Bond Work Index (kWh/t), W is the specific energy input (kWh/t), P80 is the 80% passing size of product (µm), and F80 is the 80% passing size of circuit feed (µm). 2. Calculate the Standard Circuit Bond Work Index (WiSTD) for …
Design, Construction and Performance Analysis of a 5 ...
The laboratory ball mill was designed for grinding limestone, meaning that the work index required for the specific power calculation was assumed to be the work index of limestone, which is 11.6 KWh/t, with a specific gravity of 2.6 g/cm. 3. or 2600 kg/m. 3. The feed size (F. 80) of the ball mill was assumed to be 2 mm (2000 microns).
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BOND BALL MILL WORK INDEX TEST REPORT Sample Name : Limestone, density - 2,65 g/cm3 Test Procedure: Bond Work Index Determination Method Test Equipment: Standard Bond Ball Mill Mill size: D X L = 305 x 305 mm Mill volume: 22.3 dm3 Lining of the mill: smooth steel Rotation speed. 70 rpm (85% of ncrit) Grinding Media: ' Relo - C" bodies
Relationships between comminution J energy and product ...
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 …
Determination of Bond Work Index of Lucky Cement …
In this regard calculation of work index of limestone made by standard Bond grindability test. Ball mill was employed to conduct the grinding test of seven different samples. Among all seven samples collected from the different faces of quarry, Bond work index of limestone Face4A results less than 20kwh/t, remaining 6 samples are marked as hard -
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 pre-densified particles close to the target size. •
SIMPLIFIED BOND WORK INDEX DETERMINATION By: R. O ...
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 is an alternative procedure to the ball mill grindability test.
grinding bond work index range for limestone
grinding bond work index range for limestone Chemical analyses and thin section petrographic analyses were used to characterize the limestone samples the results of the laboratory ball mill test were compared to the results of an industrial grinding test the bond work index for six samples which covered the grindability range .
Characteristics of Mae Moh lignite: Hardgrove grindability ...
test using ball-race test mill was performed. Knowing the Hardgrove indices, the Bond work indices of some samples were estimated using the Aplan's formula. The approximate work indices were determined by running a batch dry-grinding test using a laboratory ball mill. Finally, the work indices obtained from both methods were compared.
[PDF] A quick method for Bond work index approximate value ...
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial comminution plants designing. Determining the Bond work index value is quite complicated, timeconsuming and requires trained operating personnel and therefore is subjected to errors.
EFFECTS OF POOL VOLUME ON WET MILLING EFFICIENCY
6 2.5.5 Variations in media charge orientation 68 2.5.6 Distribution of slurry in ball mill charge 70 2.6 Net power draw of a ball mill as affected by slurry pool 75 2.6.1 Introduction 75 2.6.2 Torque-arm approach 77 2.6.3 Energy balance approach: Morrell's model 78 2.6.3.1 Active charge of the mill 78
[PDF] The Bond work index of limestone and andesite ...
The Bond work index of limestone and andesite mixtures. This paper investigates grinding of mineral mixtures with different grindabilities in the Bond ball mill. Understanding the ore mixture grinding is of great importance in mineral processing. The energy required for crushing and grinding is presented by the Bond work index and is determined ...
Bond Work Index Tables (Wi) | Rock (Geology) | Minerals
Bond Work Index Tables (Wi) - Free download as PDF File (.pdf), Text File (.txt) or view presentation slides online. Here there are given tables from various sources for the Bond work index values of mining materials (ores, industrial minerals and rocks). These work indexes can be used for the determination of tumbling mills (rod, ball mills) power.
GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY …
Bond Test WI's (kWh/t): Rod Mill: Ball Mill: 9.5 kWh/t.8 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 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 rod mill F80 of 16,000 m) to a rod µ
Bond Work Index Report Matrix House
The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability The sample was crushed to passing 6 mesh (3.35mm), from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill.
Optimization and Performance of Grinding Circuits: The ...
of the cyclone underflow back to SAG mill, introduction of a second classification stage as well as introduction of a second ball mill. The evaluation of breakage tests and survey data revealed the following; the Bond work index obtained for the current ore ranges between 17.20 - …
BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
The reason for this variation in ball mill work index is because the ore at Mt. Milligan has an intrinsic exponent of –0.45 in the 100 µm to 200 µm size range, not the –0.50 exponent empirically measured by F. Bond. The work index increase between 100 µm and 76 µm is due to a porphyritic grain size that causes a spike in energy
THE BOND WORK INDEX OF LIMESTONE AND ANDESITE …
THE BOND WORK INDEX OF LIMESTONE AND ANDESITE MIXTURES** Abstract This paper investigates grinding of mineral mixtures with different grindabilities in the Bond ball mill. Understanding the ore mixture grinding is of great importance in mineral processing. The energy
Metallurgical - Essa Australia - PDF Catalogs | Technical ...
Catalog excerpts. BALL MILLS, ROD MILLS & BOND INDEX MILLS Labtech Essa manufacture a range of metallurgical laboratory sized ball and rod mills to suit most applications. Included in the range is a Bond index mill which has specific application in establishing the grindability of ores (see sheet 2 of this data sheet) The ball and the rod mill ...
rod mill work index limestone
EF5BM= P80 103 1145 P80 3 The EF4 formula requires both the rod mill and ball mill work index rod mill Wi is used to calculate the optimal feed size and because this is a single-stage ball mill calculation the F80 is actually the rod mill feed size 10 000 181 m from Table 1 and the P80 is the ball mill circuit product The EF5 factor only applies below 75 181 m to ball...
ball mill bond work index for limestone - grelck-kaminholz.de
Products Inquiry ball mill bond work index for limestone. limestone bond ball mill work index pdf. bond working index or bwi of limestone . what is definition of bond milling work index . bond method for ball mill work index test. with the bond s work index hardgrove index and brittleness tests on six typical rock as a fast method
Comminution testing - JKTech - University of Queensland
A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample requirements: A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus 3.35 mm, as required for the Bond Ball Mill Work Index test feed.
Determination of Shatter Index, Tumbler Index and Bond ...
The fragility of ore depends upon its strength. In a crushed product or mining product, the fragile ore degen-erate to a undesirable fine product during blasting, excavation, loading and transportation. Similarly in a crushing and comminution process by crusher, ball mill or rod mill, as the ore of high strength attains to a desired size, the fragile ore degenerates to superfine.