Cone Crushing, Rod Milling and Ball Milling Laboratory …
The work index tests, developed by Fred C. Bond, are conducted in various test devices at a size range for which the material will be processed in the various crushing and grinding ranges. ... Four of the eight circuits, namely figures 7, 8, 9a and 9b, involve the use of cone crusher to produce either rod mill or single stage ball mill feed. A ...
Bond Work Index Procedure and Method
Preparation of Test Feed Sample for Bond Work Index Procedure: Riffle 8-10 kilograms of minus half an inch feed into 500 gram charges. Riffle one 500 gram charge of ore down to splits of 125 grams each. Record the exact weight of one split; identify it as Feed No. 1. Wet screen through a 150 mesh screen.
Bond Work Index
To evaluate the work index they considered the maximum size in the feed and also the maximum size of particles in the discharge from the crusher. To determine the size …
Cone Crushers | Moore Watson Ltd
Cone crusher Cone crushers CC100 CC200 CC400 CC300 MHP400 MHP500 / top of page. MOORE WATSON LTD. Consultancy, design and manufacture of mining, mineral processing and recycling equipment ... material crushing work index (Wi), feed particle size composition, circulating load, and moisture in the feed will affect the crusher's ability, so …
crushing index and abrasion index of limestone ore
Ball Mill Bond Work Index For Limestone | Crusher … Find Ball Mill Bond Work Index For Limestone on the web, the site is foucs on mining equipment tech. iron ore crusher selection criteria work index grindability ... Example 7-1 An ore with a grindability index = 13 is ... gold ore crusher, iron ore crusher, limestone ... Test Method for ...
Using Rock Geomechanical Characteristics to Estimate Bond Work Index
Bond ball mill work index (BBMWI) test is a standard test used to measure the ball mill work, which is calculated in accordance with the procedure proposed by the Bond [21]. ... The Bond low-energy impact test calculates the actual crusher power requirements. The crushing work index (CWI) is calculated as follows (Eq. Error! …
Bond Impact Crushing Work Index Tester
The Pendulum Tester / Bond Impact Crushing Work Index Tester. Working principle Crushing by impact. 76 mm maximum feed size. Test repetition: At least 10, preferably 20 test runs. The Bond Crushing Work Index (CWI) describes the competency of the ore at larger particle sizes. It is used for the calculation of the actual crusher power requirements.
Ore Feed Size * Work Index Hardness: Crushing & Mill Tonnage
This is the reason that the size of the electric motor for a primary crusher, that has a production rate of five hundred tons per hour, is so much smaller than the horse power of a rod mill that can only grind three hundred tons per hour. In the harder ore there are less of these fracture lines created with each size reduction.
Roll Crushers
The springs are helical and pressure varies with the size of crusher and could be as high as 6 t/m (about 8300 kPa). In some roll crushers the rolls are individually driven. ... [21] indicated that the Bond work index is not exactly a constant factor for a given ore. Otte [5] reported an increase of W i from 13.9 to 15.6 kWh/t for a copper ore ...
Relationship between A*b and Bond impact work index for …
Also, values of crushing work index (CWi) increased inversely with the A*b breakage index, as commonly observed (Napier-Munn et al., 1996; Tavares and Silveira, 2008). In order to demonstrate the ...
Minerals Processing Systems JW SERIES JAW …
Work Index of 16. Factors that markedly affect results are: • Structure of material • Compressive Strength or Crushing Work Index of material • Grading of crusher feed • Degree of pre-scalping • Choke versus irregular or low rate of feed We are pleased to examine specific applications and advise on the likely results from our machines.
Crushing Work Index and UCS
The five types of Work Index Nov 11, 2022 Software for grinding circuit design Jul 12, 2022 Bond BWi P100-P80 relationship Dec 6, 2021 SMC Test parameters from A×b ...
SAG mills selection methods. III. The F. Bond index …
The crushing work index ( CWi) is an indicator characterizing the energy amount (kW * h / t) needed to destroy single pieces of material with a relatively large size range (-75 + 50mm). The …
Bond Impact Crushing Work Index -Procedure and Table of …
The test determines the Bond Impact Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing …
Benchmarking: Bond
Secondary crushers, operating work index. The Bond (impact) crushing work index is given as 27.7 based on a laboratory determination. Use the circuit survey data to compare the operating work index to this laboratory determination. The reported power draws of these MP 1000 crushers were 460+554+583+581 for a total of 2178 kW at the DCS.
Work Index | SpringerLink
The work index can be used to evaluate the influence of various operating variables on crushing efficiency. For an industrial crushing process with a given feed …
(PDF) Comparison of measures of rock crushability
Although not as popular as the Bond ball mill or the Bond rod mill work indices, the impact work index, also called Bond crushability index, continues to be much used for crusher selection. The ...
Crushing in Mineral Processing
The Bond' Crushing Work Index is common to calculate the power needed to crush rocks from a given F80 size to a resulted P80 product size. Bond's impact method comes from a double mirrored …
BOND'S WORK INDEX: WHAT IT IS AND WHAT IT …
The commonly used grindability tests included in the database are the Bond work indices for ball milling, rod milling and crushing; the drop weight test results A, b, A×b, DWi, Mia, Mic, Mih and ...
THE BOND WORK INDEX OF LIMESTONE AND …
Keywords: Bond work index, grinding, circulating charge, composite samples * Institute for Technology of Nuclear and other Mineral Raw Materials, 11000 Belgrade, ... crusher and roll crusher in a closed cycle with screening to size -3,327mm. The samples of pure andesite and pure limestone are separated from the ground material for
Gyratory Crushers
The primary rock breaker most commonly used in large plants is the gyratory crusher, of which a typical section is shown in Fig. 5. It consists essentially of a gyrating crushing head (521) working inside a …
BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
Work index is the relation between the SEC and the amount of breakage in an ore. The most common form of this relationship is given as Equation 1, and is often referred to as …
Physical Bauxite Processing: Crushing and Grinding of …
A crusher does not know what type of material is passing through it. The crusher does however "know" the feed and product sizes, the compressibility, the work index, the level of stickiness, and the abrasion level. With all the application variables defined, the correct type and model of crushing circuit equipment can be properly specified.
1 Comparison of measures of rock crushability
The crusher has a feed opening gap of 25 mm, a stroke of 4.9 mm, a cone angle of 44o (in relation to horizontal) and a mantle length of 150 mm. A constant closed-side setting of 7.6 mm was used in ...
Table of Bond Work Index by Minerals
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. Source 2. Source 3. Source 3. Source 4.
Bond Work Index Tests | GSL
The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index. ... The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stage-crushed to passing size of <3.35 …
Impact work index prediction from continuum damage …
Crushability work index. Nomenclature. A. cross-sectional area of the impact load cell rod (m 2) C. wave propagation velocity in the ILC rod (m s −1) CB. impact …
A quick method for bond work index approximate …
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...
20150821_Morrell_Method-GMG-ICE-v01-r01
C.1.3 Pebble Crusher Specific Energy. In this circuit, the pebble crusher feed P80 is assumed to be 52.5 mm. As a rule of thumb, this value can be estimated as 0.75 of the nominal pebble port aperture (in this case the pebble port aperture is 70 mm). The pebble crusher is set to give a product P80 of 12 mm.
Equipment Sizing: Crusher or Grinding Mill
The Work Index represents the total work input necessary in installations of average efficiency. How to Find Work Index From Impact Crushing Tests. Where C represents the impact crushing strength (1) in foot-pounds per inch of thickness and S is the specific gravity, the Work Index is found by Equation 3. Equation 3: Wi = 2.59 C/S