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Bond Test WIs kWht Rod Mill Ball Mill 9.5 kWht.8 9 kWht . Bond Standard Circuit Work Index Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 m although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m to a rod
First, a Jar Mill grindability test requires a 5 lb. 2 kg sample and produces a direct measured specific energy net Hphrt to grind from the design feed size to the required product size. The second test, a Bond Work Index determination, results in a specific energy value
3 STANDARD BOND TESTS The Bonds 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 passing 100 m. If the breakage
Bond Test WIs kWht Rod Mill Ball Mill 9.5 kWht.8 9 kWht . Bond Standard Circuit Work Index Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 m although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m to a rod
and the Bond Ball Mill Work Index Test GMG, 2016a. The sampling and surveying guideline GMG, 2016b provides additional detail on how to collect the required data, and is critical to this analysis. The following required parameters are standard outputs of the SMC Test Miadescribes grinding of coarser material 750 m
Bonds approach consists of determining the ore hardness characteristics, or Work Index Wi via standardized laboratory testwork. The full suite of Bond comminution tests provide the Ball Mill Work Index BWi, the Rod Mill Work Index RWi, the Crusher Work Index CWi and the Abrasion Index
The Bond Ball Mill Grindability Test is a lockedcycle laboratory grinding test. It provides the Bond Ball Mill Work Index which expresses the resistance of a material to ball milling. This Index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding, and for ball mill scaleup.
The Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill models expect a mill with a wave liner, and is not compatible with mills using smooth liners.
Use of Work Index Since its introduction in the 1960s the Bond Ball Mill Work Index BBMWi parameter has been extensively used in predicting ball mill power draw. Along with comminution circuit design the work index parameter is widely used in tracking mill performance. Due to the age and lack of controls for the test many
work index covering grinding of fine particles is labelled M. ib Morrell, 2008. M. ia. values are provided as a standard output from a SMC Test Morrell, 2004. a whilst M. ib. values can be determined using the data generated by a conventional Bond ball mill work index test M. ib. is NOT the Bond ball work index. M. ic. and M. ih
1 Introduction Finding the bond work index of an ore type is crucial to determining the grinding energy required during comminution in a ball mill. The bond work index is a constant characteristic related to the hardness of a specific ore type. Bond work index is one of three different approaches that can be used to calculate the work index of an ore.
Dec 12, 2016 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
2.2. Ball Mill Batch Process The mill dimensions, D L, are 0.204 0.158 m and it is loaded with 6.5 kg steel balls between 25 and 32 mm in diameter. The mill rotates on rolls and its frequency is set to 70 RPM 1.667 Hertz corresponding to 85 of the critical frequency. The mill power is P 16.2 Watts,
A function of the work index of the material. Bond developed an express ion to quantify mill shaft power based on data from a number of laboratory and industrial ball mills PS 7.33JB c 10.937JBb LD2.3 10.1 29 10C AMIT 135 Lesson 7 Ball Mills Circuits
The product size distribution is narrower than a ball mill but significantly coarser. Most are overflow discharge type. Lengthtodiameter 1.4 to 2.3. Mill length 7 meters. Rod MillBall Mill Circuits Diagrams of mill circuits image 13582
Kinetic grinding test approach to estimate the ball mill work index 343 The W i parameter is obtained from Bonds ball mill grindability test Bond, 1961. This test is performed according to the standard Bond procedure which proposed model is presented in Eq. 1.
Reference mineral Granite of known weight and work index 15.14 Kwh tone was ground for 30 minutes at a particular speed and power consumed was determined from the power rating of the ball mill. An identical weight of Wasagu Manganese ore whose work index was to be determined was ground in the same ball mill under same condition as
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.
Limestone Bond Work Index Binq Mining, Apr 17 2013 ball mill bond work index for limestone ore beneficiation plant the bond work index indicates a relative grindability of the work index number is developed by grinding a small sample of the material in a more detailed Ball Mill Bond Work Index
2.2. Apparatus and method Bond work index is estimated by using a standard bond ball mil.. In this study, one special ball mill was used to perform bond tests by which bond work index can be precisely obtained. This ball mill was designed and set up by Nematollahi 15, and is commonly called calibrated bond ball mill.
Ball Mill Wio, BWio 8.6 Circuit Wio, OWio 14.6 Bond Ball Mill Work Index, BWi, kWht 13.4 Bond Rod Mill Work Index, RWi, kWht 18.1 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
FIGURE 8 ROD MILLBALL MILL WORK INDEX RATIO v. UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS MPa 0 0.5 1 1.5 2 WiRMWiBM metric Siddall et al 1996 identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ores compentency. Figure 8 plots this ratio versus UCS no trend is apparent
SAGDesign Testing. The flagship SAGDesign test is the most accurate grindability test available. The SAGDesign test measures the pinion energy to grind ore from 80 passing 152 mm to 80 passing 1.7 mm W SDT.. The 2 nd stage of the test measures the Bond Ball Mill Work Index on SAG ground ore, S ore feed is prepared from a minimum of 10 kg of split or whole diamond drill
The Bond ball mill grindability test is run in a laboratory until a circulating load of 250 is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball milling.
Bond test does not exceed 2.6. The aim of this study was to develop a new method for assessing the Bond work index in a ball mill BBWI, which is based on a first order kinetics present in the Bond ball mill for grinding mineral raw materials Austin et al., 1981 Ahmadi and Shahsavari, 2009. Theoretical basis of quick procedure
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