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Typically R = 8. Rod Mill Charge: Typically 45% of internal volume; 35% 65% range. Bed porosity typically 40%. Height of bed measured in the same way as ball mills. Bulk density of rods = tons/m3. In wet grinding, the solids concentration 1s typically 60% 75% by mass. A rod in situ and a cutaway of a rod mill interior.
Bond also defined a test for rod mill grinding using a 305 mm × 610 mm standard mill requiring up to 20 kg samples. Test conditions differ,, the circulating load is changed to 100%, and also the Bond equation for calculating the rod mill work index is slightly different.
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The Bond rod mill grindability test is a widely used tool to estimate the response of ores to rod milling. However, the mass of ore required to conduct the test, which can typically vary from about 8 to as much as 20 kg, may represent a challenge when sample availability is critical. The present work proposes an alternative procedure, which is ...
The traditional Bond work index proposed by Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.
use a rod mill F80 of 16,000 µm and a rod mill P80 of 1,000 µm. Note that—in order for no correction factor for ball mill product fineness to apply—the ball mill circuit P80 should be no less than approximately 70 µm (Bond, 1962). This Bond Efficiency determination should not be applied to cir
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Bond Test WI's (kWh/t): Rod Mill: Ball Mill: kWh/ 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 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
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Rods in place weigh approximately 400 pounds per cu. ft. and balls in place approximately 300 pounds per cu. ft.. Thus, quantitatively, less material can progress through the voids in the rod mill grinding media than in the ball mill, and the path of the material is more confined. This grinding action restricts the volume of feed which passes ...
The grindingproduct size, P, in a Bond ball mill, which is given by the aperture size which passes 80% of the grinding product as a function of the aperture size of the test screen Pk, can be expressed by the formula P= P k K 2. These functions for G and P enable us to calculate the value of Wi for any other size of grinding product if we know ...
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The Bond work index (BWI) is a wellknown method used when selecting comminution equipment, to evaluate the grinding efficiency and to calculate the required grinding power.
b=70%. b= 100%. b=0%. 2. E. It should be emphasised that this increase is with respect to ~95% passing size material and not 80%. passing size (or P80) as defined in Bond's method. screen sizes ...
Unrelated 'entertaining' image. The specification for the apparatus to determining a "Bond" rod mill work index is first described in Bond Maxton (1943). It states that the apparatus is a tumbling rod mill to be operated in a locked cycle test at a fixed circulating load. The geometry of the grinding chamber is described as: mill ...
EquipmentCompression machine, Fc bond ball mill . rice mill in Cairo, Al Qahirah, Egypt. best ball mill for quartz in Cairo, Al Qahirah, Egypt . Crushing and grinding equipment | Sepor 30cm x 30cm ball mill used for FC Bond method of grindability testing.
Bond Rod Mill Wi Test. Apparatus The Bond rod mill is made of metal, 305 mm maximum inside diameter, with a wavetype lining. The internal mill length is 610 mm. The grinding charge consists of six mm and two mm diameter steel rods, all mm in length, and weighing a total of 33,380 g. The Bond rod mill runs at 46 rpm ...
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The Bond work index (BWI) is a wellknown method used when selecting comminution equipment, to evaluate the grinding efficiency and to calculate the required grinding power. ... the grindability data of an unknown ore with a reference ore whose grindability data are known and determined in a Bond ball mill. The test is performed on samples of ...
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