2017-11-23Use 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
Mill power draw prediction can be carried out using Morrells power model for tumbling mills Morrell 1998. Bond method The established technique for determining power requirements for ball mills is the Bond method Bond 1961. This method also involves the application of some efficiency factors as described by Rowland 1975
2013-11-4re Clinker grindability. Some years ago I had some grindability testing done by Magotteaux. Two separate tests were performed the first was the SGI test which assessed the number of revolutions within a test mill that were required to produce a surface area of 350 m2kg. The second was a breakability test which assessed the height that a
SAGDesign testing provides SAG pinion energy grindability in kWht to within - 5 from 152 to 1.7 mm and Bond Ball Mill Work Index on SAG ground ore from the SAG test on the same sample. Starkey Associates uses the patented SAGDesign technology to calculate accurate mill sies from measurements on a clients own ore samples
2017-8-14assumed feed passing sie varied from 5mm to 25mm. The work index WI used was 14kWht for the CFRP according to the Typical Bond Index value. For each test the power draw is determined by the calculation software designed by the Smart Dog Mining Company who developed the software from information gathered over 40 years in the mining industry
2020-5-31The SMC Test is a laboratory comminution test which provides a range of information on the breakage characteristics of rock samples for use in the Mih and Mic. 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
2018-10-23The typical loglog plot obtained from Bonds ball mill test. Note Tyler sieve numbers on the x axis ranging from 6 to 200 mesh represent a sie range from 3.35 to 0.075
2017-10-18The Bond method for ball mil designing has been used for 60 years. Based on the Work Index test such method is applied mostly in traditional circuit configuration which includes multi-staged crushing followed by rod and ball milling. On the other hand simu - lation is a widespread and used technique for comminution classification modeling and
2015-4-22Generally there are three Bond indices ball rod and crushability. The Bond ball and rod indices are determined using standard ball and rod mill respectively and are suitable for grinding. The Bond crushability index which is estimated using a standard impact crushability test is suitable for crushing21. Because the jaw crusher was
2013-12-24Determination of Bond index of Birnin- Gwari Iron Ore in Nigeria The determination of work index using modified Bonds method can be compared to method of determining it by Berry and Bruce 1966. Table 3 below shows the sieve analysis of the feed of test ore to Ball mill. Table 3 The feed of test ore to Ball mill. Sieve sie range m
2014-12-3the test. The higher the index is the easier the coal to be pulveried. However this index can not be used to sie a pulverier and mill power directly. Only the specific energy mill power over capacity is a main parameter for mill siing. Specifically the Bond work index is suitable for utiliation in
2019-12-7WiBM Bond Ball Mill Test Work Index kWht 3. KEYWORDS Autogenous Grinding AG Ball mill Bond Work Index Wi Comminution circuit High Pressure Grinding Rolls HPGRs Rod mill Semi-Autogenous Grinding SAG Spe-cific energy W 4. INTRODUCTION AND BACKGROUND The Morrell method for predicting the specific energy
2015-12-16shortcomings the test was changed to a locked cycle technique as described below. LOCKED CYCLE TESTS . The preferred test procedure is a locked cycle test akin to the Bond Ball mill work . index determination. The first cycle starts with minus 6 mesh ore removed since it is believed that the fines content can fill most of the voids allowing
Bond Ball Mill Work Index Xsm. 2020-5-9Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done The sample was crushed to 100 passing 6 mesh 3.35mm from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill
2020-5-13In 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
2020-5-9Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done The sample was crushed to 100 passing 6 mesh 3.35mm from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill. A feed particle sie analysis was performed to determine feed P80 and
2016-12-12The basic parameters used in ball mill design power calculations rod mill or any tumbling mill siing are material to be ground characteristics Bond Work Index bulk density specific
2016-9-9Determination of Bond Index of Wasagu Manganese Ore in Kebbi State Nigeria. Alabi Oladunni Oyelola Shehu Aliyu Yaro Binta Hassan ABSTRACT - In this study the work index of Wasagu Manganese Ore deposit in Kebbi State of Nigeria was determined using the modified Bonds Method of determining work index also known as Berry and Bruce method
2007-4-3In the second step of the testing method the test is based on the Bond ball mill. The product from the first step is then used for determination of the required ball mill energy for the secondary grinding stage to reach the target grinding sie. The empirical formula to calculate Bond Mill Work Index BWi is presented in the equation 2
The Bond Abrasion Test determines the Abrasion Index which is used to determine steel media and liner wear in crushers rod mills and ball mills. Bond developed the following correlations based on the wear rate in pounds of metal wearkWh of energy used in the comminution process
2015-4-16Bond developed a standard laboratory test for the determination of the work index for ball and rod mills in 1952 and modified it in 1961. The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250 circulating load. The standard procedural outline of the test is stated in Bond 1961. The work index for a
2018-2-20Mill Ball Mill Closed circuit crushing to 16 mm 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 Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK
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
2014-10-1Drop Weight Index DWi and the coarse ore grinding index M ia. Test data from the Bond ball mill work index test is used to calculate the fine grinding index M ib. The M ia and M ib indices are used to calculate specific energy for the coarse W a and fine W b components of the total grinding specific energy at the pinion W
2020-5-16The 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. A quick method