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In the Berry and Bruce procedure, 2 kg weight samples of the reference and unknown ores with a particle size under 1.651 mm are wet ground in a laboratory ball mill that is 305 mm in diameter, using active power monitoring. According to the Bond Third's Law of comminution (Equation (1); ), after performing both grinding tests with the same ...


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Jan 01, 1992· Converting the measured shaft power on the mills to the equivalent power for the cylindrical section gave a variation of mill power per unit length with respect to mill diameter of D 2.3, in agreement with the Bond mill power equation. However, the predicted mill power is 10% higher than that given by the Bond equation. Read More


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An evaluation of Relo grinding media (RGM, Reuleaux tetrahedron-shaped bodies) performance versus standard grinding media (balls) was made through a series of grinding tests, including a slight modification of the standard Bond test procedure. Standard Bond tests showed a reduction in the Bond ball mill work index (wi) of the mineral sample used in this study when using Relo grinding media.


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the mill. Fred Bond had based the majority of his work on ball mill feed which in his day was rod mill discharge. Since rod mill discharge usually is about 80% passing 10 mesh, it can rightly be concluded that the Bond ball mill work index equations relate to the comminution of this size of product. Mistakes in SAG power requirement and sizing were


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21 CONCLUSIONS Continued In the present work, equations were also derived, giving: zthe ball-mill power drawP as a function of its dimensions: internal mill diameter D and length L, zthe ball-mill power drawP as a function of the feed D f (mm) and the product size d (mm), the Bond work index w i (kWh/short ton) and the mill throughput T (short ton/h), zthe ball-mill dimensions (D and L), when ...


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Bond Work Index (Energy equation) - Grinding ...

You need a two-stage solution, first stage open-circuit mill and then second stage closed-circuit mill. First stage, will be broken into two parts as well, you use a Bond rod mill work index for the coarse component of the ore (+2.1 mm) and the Bond ball mill work index for the fine component (-2.1 mm).


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Table 1 Bond mill charge distribution Ball diameter, inch No. of balls Distribution, % 1 ½ 25 8.8 1 ¼ 39 13.7 1 60 21.0 7/8 68 23.9 3/4 93 32.6 The standard Bond grindability test is a closed-cycle dry grinding and scree ning process, which is carried out until steady state conditions are obtained [11-14].


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A bond graph is a graphical representation of a physical dynamic system.It allows the conversion of the system into a state-space representation.It is similar to a block diagram or signal-flow graph, with the major difference that the arcs in bond graphs represent bi-directional exchange of physical energy, while those in block diagrams and signal-flow graphs represent uni-directional flow of ...


[PDF] Why is the Bond Ball Mill Grindability Test done the ...

The Bond Ball Mill Grindability Test is a locked-cycle 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 scale-up.


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