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 ...
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As with our standard range of ball and rod mills, the Essa® Bond Index Ball Mill and Bond Index Rod Mill are supplied standard with a barrel and rotating yoke assembly and the electric motor drive mounted on a stand …
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To calculate the Bond work index ( Wi) in a standard laboratory scale rod-mill, Bond derived the following equation: (1) W i = 62 P i 0.23 G i 0.625 10 P - 10 F kw h sh t where F is 80% passing size of original feed, P is 80% passing size of circuit product and Pi is the test-sieve size in μm [1]. The standard procedure to determine all Bond ...
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Bond Rod Mill Grindability Test. GSL 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 …
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Measuring ore grindability in rod mills. The Bond Rod Mill Work Index is a measure of the resistance of the material to grinding in a rod mill. It can be used to determine the grinding power required for a given throughput of material under rod mill grinding conditions. It is a 'locked cycle' test conducted in closed circuit with a laboratory ...
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* Bond F. C., "Crushing Tests by Pressure and Impact", Trans AIME, Vol 169, 1947, pp 58-66. Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied.
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Using the Bond work index to measure operating comminution efficiency Download PDF. Download PDF. Published: 01 ... "Selection of rod mills, ball mills, pebble mills, and regrind mills," in Design and Installation of Comminution Circuits, Andrew L. Mular and Gerald V. Jergensen, eds., SME, Chapter 23, pp. 393–438.
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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
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The standard Bond Rod Mill Work Index test. procedure is firstly to stage crush the feed to pass. 12.7 mm, and size a representative sample. The. test then involves a series of batch grinds in a. standard Bond rod mill. A Bond rod mill is 0.305m. by 0.610m, with wave liners (of a form described by Bond), which runs at 40rpm and tilts as ...
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Work Index, Work Index Efficiency, Bond Work Index testing 4.INTRODUCTION AND BACKGROUND The Bond method allows for quantification and com-parison of relative …
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RWi is the rods grinding work index. It is applied for the energy input calculation (kW*h/t), that is needed to grind one ton of material in the rod mill. Rod mills are used in the grinding of material (on the …
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The wide-spread occurrence of Bond's theory is owing to Bond's method of ore strength assessment, that allows finding work indexes under laboratory conditions [4]. Theo-retically, the work index equals the amount of energy (kWh/t) consumed to comminute 1 t of infinite size material down to 80% content of –100 μm size grade.
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The power predictions for ball mills typically use the following form of the Bond equation: ... W is the work index measured in a laboratory ball mill (kilowatt-hours per metric or short ton) P 80 is the mill circuit product size …
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WiRM Bond Rod Mill Test Work Index (kWh/t) WiSTD Standard Circuit Bond Work Index (expected or designed) used for circuit design. Specific energy ... dard Circuit, assume 2.44 m diameter overflow mills, and 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
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Bond Test WI's (kWh/t): Rod Mill: Ball Mill: 9.5 kWh/t.8 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 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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using Bond rod mill work index (RMWI), and Bond ball mill work index (BMWI). However, the author has developed a ... Rod mills are limited in size to 2000 kW because the longest commercial grinding rod available is 6 m long. For this reason rod mills are rarely selected in the present day environment
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The Bond Index conforming rod charge consists of: 6 rods of 1.25" diameter and 21" length; 2 rods of 1.75" diameter and 21" length; The grinding jar for the Bond Index Rod Mill is …
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The Bond work index (Bond, 1960) is based on Bond's law, which states that the energy consumed is proportional to the 1.5 power of particle size rather than the square of …
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that the Bond CWi and the standard Bond BM Wi both recorded average values of 8 kWh/t, it was surprising that the Bond Rod Mill Wi average was 11.3 kWh/t. Since the ore is unusually soft, the Rod Mill Wi is probably irrelevant in determining required power for the SAG mill. Drop Weight Tests
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As with our standard range of ball and rod mills, the Essa® Bond Index Ball Mill and Bond Index Rod Mill are supplied standard with a barrel and rotating yoke assembly and the electric motor drive mounted on a stand …
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RWi is the rods grinding work index. It is applied for the energy input calculation (kW*h/t), that is needed to grind one ton of material in the rod mill. Rod mills are used in the grinding of material (on the whole, the ore), the size of which is -13,2 +3,2 mm.
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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 apparatus. The SAGMILLING.COM models expect a mill with a "wave liner", and is not compatible with mills using "smooth liners". ... When Wi RM is used to size SAG mills, the Bond/Barratt model assumes a 14# Tyler ...
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The Titan Bond Work Index Rod Mill is one-piece 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 …
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along with the grinding size. In this study, a variability bysis is carried out with the Bond standard grindability tests on different critical metal ores (W, Ta), ranging from coarse grinding (rod mills) to fine grinding (ball mills).
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The classical method used to predict the specific energy consumption in grinding ores in rod mills was proposed by Fred Bond and is based on the work index (Bergstrom, 1985). The Bond rod mill work index (Wir) is measured using Bond´s standard rod mill grindability test, which is conducted in locked-cycle mode to emulate the …
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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 …
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Essa's ball and rod mills can be supplied as complying machines with the appropriate barrels and ball or rod charges. As with our standard range of ball and rod mills, the Essa® Bond Index Ball Mill and Bond Index …
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A "Bond" rod mill work index is to be determined in an apparatus with a wave liner. The author is aware of four laboratories that …
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The Bond Index conforming rod charge consists of: 6 rods of 1.25" diameter and 21" length; 2 rods of 1.75" diameter and 21" length; The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.
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Essa's ball and rod mills can be supplied as complying machines with the appropriate barrels and ball or rod charges. As with our standard range of ball and rod mills, the Essa® Bond Index Ball Mill and Bond Index …
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Rod mills generate small amounts of fines, as fine particles typically accumulate in the space between rods without enduring comminution [2]. Effective grinding of this material occurs in the ball mill compartment, generating finer fragmentation. The Bond Rod Mill Work Index (BRMWI) test was only possible for Blend 5 (Table 2) due to excessive
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The design of rod and ball mills is still carried out with the Bond ball mill and rod mill grindability tests. As discussed earlier in this paper, it is important in this case to match the reduction size of the test to that desired from the industrial mill. As such, primary ball mills should be designed with the rod mill work index, and single ...
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