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Jan 01 2016 Bonds crushing work index of gypsum. 3.4. A sample of granite passing a 7.5 cm square opening screen was suspended in a Bonds pendulum test. The length of the pendulum was 413 mm and the mass of hammers is 13.6 kg each. The sample was completely crushed when the initial position of the pendulums made an angle of 30 with the vertical.
Bond impact crushability work index CWi Bond 1963 results reported for iron ores vary from hard iron ore 17.7 kWht to medium hardness iron ore 11.3 kWht and friable iron ore 6.3 kWht Table 2.11; Clout et al. 2007.
On the other hand since the Bonds index is calculated based on a series of crushing and grinding tests Bergstrom 1985 it is more sensible to the presence of structural defects micro cracks fractures cleavage and inhomogeneous. . . irregular shape of specimens elastic and plastic behavior of rocks Demi- rel 1988.
Mar 20 2017 The Pendulum Tester Bond Impact Crushing Work Index Tester. Working principle Crushing by impact. 76 mm maximum feed size. Test repetition At least 10 preferably 20 test runs. Adjustable crushing angle Repeatable crushing results Safe two-hand operating buttons The Bond Crushing Work Index CWI describes the competency of the ore at larger particle sizes. It is used
Jun 01 2007 Crushing energy using Bonds index. It is assumed that a 10 cm height cubic shape specimen and a 10 cm diameter spherical shape specimen are crushed between two rigid jaws and its dimensions are reduced to 2 cm. To predict the energy consumption during size reduction process Bonds relationship that is expressed as following is used .
The work index in Bonds law for crushing of solids has the following dimensions a No units dimensionless b KWhton c KWton d KWh.m 12 ton
The Bond low energy impact crushing work index test is specified to be performed on rock specimens between 50 mm and 75 mm in effective diameter. NQ-diameter drill core frequently used in mineral exploration programs does not meet that specification it being 45 mm diameter or less.
bond crushing work index Mobile Crushers all over the World. Bond Work Index. In the 1930s through early 1950s Bond developed a new theory of comminution that introduced an index called the Bond Work Index which relates power consumption in crushing and grinding to
Dear all while researching about the bond crushing work index Wic I realised that the procedure of the test is described differently in different sources. The same seems to be true for sampling. Two examples Bergstrom 1985 Crushability and Grindability The hights of the hammers start for
Jun 19 2015 Table of Bond Work Index by Minerals. Post navigation. Previous. Next. This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on around the world sample. You can find the SG of each mineral samples on the other table. Source 1 Source 2 Source 3 Source 3 Source 4 Source 5 Source 6 Source 6 KWht Source 6;
116 Crushing and classification ∝ − 3 i 52 i 3 f 52 f x x x E giving − f i 10 10 x x E W i 11.5 where Wi is the Bond Work Index again in energy per unit mass terms. The index is defined as the energy required to crush from infinite size down to 100 m hence the 10 inside the brackets. Bonds
The Bond low energy impact crushing work index test is specified to be performed on rock specimens between 50 mm and 75 mm in effective diameter. NQ-diameter drill core frequently used in mineral exploration programs does not meet that specification it being 45 mm diameter or less.
A clear definition of the required crushing capacities and the desired product quality can be precisely determined by using the Bond Index test methods. Using the Bond Index test procedures it is possible to calculate crushing abrasion behavior of mineral samples. This knowledge is essential to define the required ball mill layout and .
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 INDEX EFFICIENCY .
The Bond crushing work index has very poor precision which may result in extremely large differences between labs treating the same material Angove and Dunne1997. Angove and Dunne reported that for some samples the coefficient of variation standard deviationmean was as high as 43.5 being a
Ammtec. Values of Bond crushing work index will vary from a 8 kWht for laterite hardcap through to 22 kWht for banded iron formation to 46 kWht for fresh greenstone.
Using the Bond hypothesis the Vibratory Work Indexes were determined for the tested materials. Their values are higher than limestone and diabase Work Indexes available in the known literatures. The explanation may be greater amount of energy transferred to the material during vibratory crushing which results in much higher efficiency of the .
Mar 13 2015 Bonds theory 22. 1. Bonds work index is the work required to reduce unit weight from a theoretical infinite size to 80 passing 100 m. 2. This theory is useful for rough mill sizing. 3. The work index is useful for comparing efficiency of milling operations 23. Kicks Theory 24.
The 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 .
The work index in Bonds law for crushing of solids has the following dimensions a No units dimensionless b KWhton c KWton d KWh.m 12 ton
Rittingers theory and law of the energy expended in crushing of .. of the weaker bonds and the particles thus formed are free to resume their. determination of the bonds work index of baban Keywords Grindability comminution energy mineral comparative The Bond work index Wi is used as a measure of grindability of an ore Deniz 2003;.
Posts Related to bond crushing and grinding calculations part i and ii bond f.c. 1961. crushing and grinding calculations bond ball mill work index clinker load calculation for ball mill circulating bonds work index ball mill manufactuering design formulas of calculation belt conveyor pdf. Contact Us. Tel 86-21-58386256;
Bond Impact Crushing Work Index Testing Machine Crushing and milling circuit control systems that balance the crushing plant output to the grinding mill capacity will maximize plant capacity at the lowest production cost. Properly applied the technology described will reduce the magnitude of the over-design parameters used in most .
FIGURE 1 BOND CRUSHING WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS MPa 10 20 30 40 50 WiC metric The scatter of the points in Figure 1 indicates no correlation between crushing work index and UCS.