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BOND WORK INDEX. The Bond Work Index is a factor that measures the energy consumed in size reduction operation of the ore. The Bond's Work Index equation is: W=WI* (10/√P80 -10/√F80) where. W= the energy input (Work input) per ton, kwh/metric ton. WI= Work Index= specific energy per ton, kwh/metric ton (characterizes the ore)
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 comminution plants designing. Determining the Bond work index value is quite complicated, timeconsuming and requires trained …
The Bond Work Index approach is the standard method of selecting ball mills to grind from about 3 mm to 25 µm provided that correction factors are used if …
PLK (Partially Laterised Khondalite) rock is a general terminology used in this paper for those rocks which are in general associated in bauxite mining such as Partially Altered Khondalite (PAK) rocks, Partially Kaolinised Khondalite (PKK) rocks and Lithomerge. This paper deals with the Bond's work index, Hardgrove index and …
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For example, E S = 1.27, 0.705, and 0.548Jm −2 for graphite, quartz, and average feldspar, respectively (Brace and Walsh 1962;Zhang and Ouchterlony 2022).
Ore hardness can be estimated using commercially available standard techniques such as the SAG Power Index (SPI), Bond Work Index (BWI), and JK Drop Weight (JKDW) tests (Bailey et al., 2009 ...
1, according to Bond [2] n = 0.5 and according to Charles [3] and Stamboliadis [4], n. can take any value near these two. In the case that the initial size is infinite and the final size is 100 μm then by definition the required specific energy is called work index . W. i,100 e W. i (2) The value of the constant . C. in (1) can be calculated
The Bond standard grindability test provides a Work Index that is widely used to estimate the energy required for grinding, but the test cannot be applied to fine materials such as plant tailing ...
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 ...
Compare and Understand Rod/Ball/Impact-Crushing/Abrasion BOND Work Index. The test determines the Bond …
The Bond Work Index approach is the standard method of selecting ball mills to grind from about 3 mm to 25 µm provided that correction factors are used if necessary. The power prediction is fairly accurate for devices that produce a product with a size distribution parallel to that of the feed. ... BEUMER Group to design and supply overland ...
Physicomechanical properties of ore campaigns Blend type Bond work index (kWh/Mg) Compressive strength (MPa) Moisture content (%) 9.9 9.3 10.1 9.7 19.2 27.5 18.8 17.8 3.5 3.8 3.3 3.6 Spec CO BYO BCO Equipment factor To control the quality of ore produced from the crushing plant, the appropriate equipments should be selected for the …
The higher the Work Index the more work required to crush the rock. The amount of energy required to do this work is important to understand to maximise efficiency. ... Coal. 22. Basalt. Crushing Work Index. Material. 17. Iron Ore. 14. Copper Ores. 3. Glass. Crushing Work Index. Material. 14. Quartz. 13. Limestone. 16. Gold Ores. The kilowatt ...
size distribution of each ore with which the work index was evaluated. In all tests the size 80 is below 2000 µm. Fig. 1. Ores for the work index test: a) type and b) feed size 2.2. Ball mills and operation conditions Fig. 2(a-d) shows the ball mills used in the determination of the Work Index (standard mill BBM and
The coatings were tested in accordance with the standards for this type of refractory A c c e p t e d M a n u s c r i p t materials, 18,19 and with respect to our previous works in this field, 11 ...
Bond Work Index (BWI) & Hardgrove Grindability Index (HGI) tests for biomass & coal. ... The coal sample was crushed in a Retsch Jaw Crusher (Hann, Germany) to 3.35 mm and (prior to testing) a full cumulative size distribution was performed on the coal and olive cake to obtain the 80% passing size of the feed (F80), while the average pellet ...
Design engineers generally use Bond Work Index and Bond energy equation to estimate specific energy requirements for ball milling operations. Morrell has proposed different equations for the Work Index and specific energy, which are claimed to have a wider range of application. In this paper an attempt has been made to provide a …
The traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.
The Bond work index, W i, as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding product.Therefore, in practice we can expect some difficulties and errors when the energy consumption is determined according to this formula in the case when, for a given size …
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 …
the finer sizes. If a coal contains a high percentage of middlings material, SGS can perform the crushing studies required to determine if additional yield can be obtained by liberating coal from the middlings through crushing. SGS coal float/sink analysis can be done on samples ranging in size from bulk washability samples (over 1 ton) to core
When adapted to the crushing process, ower becomes a function of reduction ratio and work in i ex: Where W = power in kWh per st W, = Bond's crushing work index Pno = size in pm, 80% product passing Fgo = size in pm, 80% feed passing R,. = reduction ratio This work is carried out in crushing machines of several tvoes: i r
In mining, a work index is a measure of the energy required to grind a material to a specified particle size. It is used to estimate the energy consumption of crushing and grinding operations in ...
The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and …
The F. Bond Pendulum crusher Carring on with a theme that we've already touched in the previous publication, we will consider the methodology of the F. Bond index calculating. As you know, there are …
"Comminution law" and for "CIPSD" substream use "3 kWhr/ton" under "Bond work index" column. See Aspen Plus built-in help: "Bond's Law" for further information on Bond work index. Bond considered that the work necessary for reduction is inversely proportional to the square root of the size produced.
Bond Work Index (BWI) & Hardgrove Grindability Index (HGI) tests for biomass & coal. BWI can predict the potential for mill choking of biomass in a tube and …
Standard size ranges and the related Bond work indexes Feed size F 80, μm Product size P 80, μm Work index 100000 10000 crushing CWI 10000 2100 rod milling RWI 2100 100 ball milling BWI Fig. 1. Laboratory equipment used by RIVS for determining the Bond work indexes: (a) CWI; (b) RWI; (c) BWI а b c
