FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 35 WiRM (metric) The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index (Wi RM) versus UCS. These parameters also display no recognisable relationship. .
The Bond ball mill work index is one of the most commonly used grindability tests in mining, and is often referred to as the Bond work index. The test is a 'lockedcycle' test where ground product is removed from test cycles and replaced by fresh feed. The test much achieve a steadystate before completion. Sample Requirements. The test requires about 8 kg of material. Although it can work on ...
Bond Work Index Tests Grinding Solutions Ltd. Grinding Solutions can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill The test requires a minimum of 20kg of 125mm material Closing screen sizes typically range from 475mm to 212m Abrasion Index Test The Abrasion Index is a recognised procedure to quantify abrasiveness and approximate ...
using Bond rod mill work index (RMWI), and Bond ball mill work index (BMWI). However, the author has developed a relationship between the Bond third theory SE values and the AG/SAG SE values to enable the additional power required for AG/SAG milling to be determined. AG/SAG inef ciency varies according to the transfer size fi . Oline Chat. A Comparison of Test Procedures for Estimating the ...
work index approximate value is exactly the same as in the first two grinding cycles of. the standard Bond test and consists of the program. Prepare a sample, the same as for the standard Bond ...
Commentary on the apparatus of the Bond rod mill work index The Bond "Third Theory" of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond (and his collaborators) were gathering the information to calibrate comminution models.
nds rod mill for work index. The rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80% passing mm (½ inch, the original test being developed in imperial units) to a product size of approximately 1 mm (in the original and still the standard, 14 mesh; see Chapter 4 for definition of mesh), thus determining the rod mill work index (WiR or RWi).
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 mills, Rod mills, Crushers, High Pressure Grinding Rolls (HPGR). The SMC Test® also generates the JK rock breakage parameters A, b and ta as well as the JK crusher model's t10Ecs matrix, all of which are generated as ...
Bond rod mill standard testStandard conditions for determining the work index of rod mills under laboratory conditions are: mill size = 305 mm (internal diameter) × 610 mm (internal length) with wave type lining. material dry mineral. quantity − 1250 cm 3 (tapped down to give a reproducible bulk density) mill chargesteel rods − 6 × mm dia × m long steel rods plus . 2 ...
bond mill work index for limestone. bond mill work index of limestone nechcidrahe bond work index value for limestone bond mill work index for limestone baeckereimiethsam de The Bond s standard ball mill is used to determine the work index value of differ ent samples The Bond work index is defined as the kilowatthours per short ton required to break from infinite size to a product size of 80 ...
· 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. This is because work index frequently changes as a function of the product size in comminution. If target grind size during a project is changed, or if the test is run at the wrong product size, then it is necessarily to provide a correction. The ...
Bond Rod Work Index Mill 911Metallurgist. Bond Rod Index Mill 12 x 24 consisting of a one 1 piece cast shell complete with integral wave 1 Hp 360220 volt motorgear reducer drive support frame which allows the mill to tilt 5 degrees during operation and 45 degrees for discharge manual operation receiving pan rod charge and control panel complete with digital revolution counter startstop buttons ...
Rod mill work index is used in the SAGMILLINGCOM BondBarratt specific energy consumption model The work index is used to calculate the energy requirement to grind rocks in the medium size range from 10 mm 20 mm down to about 2 mm Whatever your requirements, you 'll find the perfect serviceoriented solution to match your specific needs with our are here for your questions anytime 24/7 ...
Table of Bond Work Index by Minerals. mills with the rod mill and ball mill laboratory work indices. Note, in Figure. 1, that the rod mill product slope is less than due to an extra amount of nes present being ner than 650 m. These nes proceed to the ball mill improving the ball mill ef ciency.
CORRELATION BETWEEN BOND WORK INDEX AND MECHANICAL PROPERTIES OF SOME SAUDI ORES Gamal S. Abdel Haffez ... The Bond grindability test has been widely used for predictions of ball and rod mill energy requirements and for selection of plant scale comminution equipment [5]. In most mining operations, blasting, crushing, and grinding are necessary parts of the comminution .
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, which is used at Anaconda Research Center to approximate the work index, is an alternative procedure to the ball mill
· SIMULATING THE CALCULATION OF THE BOND RODMILL WORK INDEX Afterthe parameterskl, n 1, k' and n' are obtained,the mathematical models of simulating the calculation of the Bond rodmill work index can be written as the firstcycle: where C, is the ratio of the circulating the ith cycle (i a 2): with the ending conditions: 150 Table2. Experimental and .
The rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80% passing mm (½ inch, the original test being developed in imperial units) to a product size of approximately 1 mm (in the original and still the standard, 14 mesh; see Chapter 4 for definition of mesh), thus determining the rod mill work index (Wi R or RWi).
Open circuit 8' dia. rod mill to 1 mm Closed circuit 8' dia. ball mill to P80 um The ore Test Work Index = Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classifiion Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK INDEX EFFICIENCY DETERMINATIONS! 10. 2/20/2014 6 Example SAGBall Mill Circuit WI .
Bond rod mill work index, rwi, kwht 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 profitability. mill operators have long used operating work indices to evaluate grinding circuit Orway Mineral Consultants Canada Ltd Mississauga On ...
The Titan Bond Work Index Rod Mill is onepiece cast construction with integral wave liners of a form described by Bond. This mill is used to perform the necessary metallurgical testing to determine the grinding characteristics of ores and power requirements for . Get Price Bond Work Index Rod Mill Titan Process Equipment Ltd. Prices / Quote. Bonds Rod Mill For Work Index ...
work index series (ball mill, rod mill, and MacPherson autogenous) and pilot plant tests require relatively more weight (for a given top size) because they are run until a steadystate is achieved, which involves replacing the mill charge several times throughout the test. The Bond tests are typically run for a minimum of seven cycles, while the MacPherson and pilot plant tests are operated ...
Bond Rod Work Index Mill. Bond Rod Work Index Mill. Bond Rod Index Mill, 12" x 24" consisting of a one (1) piece cast shell complete with integral wave, 1 Hp 3/60/220 volt motor/gear reducer drive, support frame which allows the mill to tilt +/ 5 degrees during operation and 45 degrees for discharge. Bond Rod Mill Work Index greenrevolution
rod mill work index has not been de ned as yet. The ball fi mill work index is con rmed at 16 kWh/t. The operating fi work index, though, is in the range of 21 kWh/t to 25 kWh/t showing high ineffi ciency. This raises the point that, in some cases, the Bond EF4 .
In this paper, systematic errors encountered in a rod mill Bond Work Index determination related to the weight and size distribution of the sample are first estimated experimentally. The first type is shown to be relatively small, whereas the second can be as high as 3 kWh/t when the feed size F 80 is finer than mm. A phenomenological basis for this error, derived from size discrete, time ...
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