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Calculation model of coal comminution energy consumption
Jun 01, 2016· They can be expressed in an equation proposed by Walker et al. (1937) (1) d e =C d x x n where e is the energy consumption, x is the particle size, C and n are constants. The specific values of n as 2, 1 and 1.5 correspond to Rittinger’s, Kick’s and Bond’s laws respectively.
Energy considerations in compressive and impact crushing
Aug 01, 2008· Other similar models for energy consumption, referred to as Kick’s and Rittinger’s equations are shown in Eqs.,. (1) W Bond = C Bond × 1 p 801 f 80 (2) W Kick =C Kick ln p 80 f 80 (3) W Rittinger = C Ritt × 1 p 801 f 80. Here, W is the energy consumption per tonne of material crushed, C Bond is the socalled work index of the rock
CORRELATION BETWEEN BOND WORK INDEX AND
The crushing energy in mineral processing industry is usually determined by empirical Bond index, regardless of the mechanical properties of a rock. Although several attempts have been made to obtain the comminution energy based on theoretical approaches, it would be beneficial to examine this relation based on physical concept.
Bond Work Index For Coal In Crusher SPECIAL Mining machine
Bond Work Index For Crushing Coal . Bond work index for crushing coal 11 crushing and classification particles 1 crushing and classification rittinger bond and kick respectivelyittinger 1867 where wi is the bond work index again in energy per unit mass. More Details How To Calculate Crusher Work Index
(PDF) A quick method for bond work index approximate value
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
Comparison between bond crushing energy and fracture
crusher were compared with those of the Bond crushing energies (estimated from the Bond crushability index) of the rocks. Also, the effect of the Bond crushability index on the estimated crushing energy of the rocks was studied. Materials and methods In this work, nine different rock specimens were obtained from some mines in Iran.
K r Kicks constant Bonds Law and Work Index The work
Determine the energy required to crush the material from 25 mm to 3.5 mm. Assuming: a) Ritttingers law b) Kicks law c) Bond law 2) A material is crushed in a blake jaw crusher such that the average size of particle is reduced from 50 mm to 10mm with the consumption of energy of 13.0KW/(kg/s).What could be the consumption of energy needed to
C O N S U L T I N G L T D TECHNICAL MEMORANDUM
Bond ball mill work index: Figure 2: Ball mill for determining Bond ball mill work index 1 For the purists, there were two models in existence at the time: the Von Rittinger and Kick models. Neither of these gave results that matched the observations of specific energy consumption from tumbling mills.
Rock Crushing Theory and Formula using Kick & Rittinger's Law
Rittinger’s theory and law of the energy expended in crushing of rock is that the work of crushing is proportional to the reduction in diameter; or, as I have more fully expressed it: “The work done in crushing is proportional to the surface exposed by the operation; or, better expressed for this purpose, the work done on a given mass of rock is proportional to the reciprocal of the
QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE
Determination of the energy consumption for ore grinding in a Bond ball mill requires samples of standard size, because changes in the size of the samples cause the change of the Bond work index (Magdalinovic et al., 2012). Due to the Bond
(PDF) A quick method for bond work index approximate value
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
Bond Tests Mining SGS
* Bond F. C., “Crushing & Grinding Calculations”, Reprint from British Chemical Engineering, AllisChalmers Publication 07R9235B. Bond Low Energy Impact Test. The test determines the Bond Impact Work Index which is used with Bond
K r Kicks constant Bonds Law and Work Index The work
Determine the energy required to crush the material from 25 mm to 3.5 mm. Assuming: a) Ritttingers law b) Kicks law c) Bond law 2) A material is crushed in a blake jaw crusher such that the average size of particle is reduced from 50 mm to 10mm with the consumption of energy of 13.0KW/(kg/s).What could be the consumption of energy
Prasher, P.L. 1987. Crushing and Grinding Process Handbook
All the three classical models such as Rittinger’s, Kick’s and Bond’s law were found suitable to explain the energy consumption for grinding. Energy consumption increased exponentially with decrease in classifying screen size of hammer mill. The Work index
C O N S U L T I N G L T D TECHNICAL MEMORANDUM
Bond ball mill work index: Figure 2: Ball mill for determining Bond ball mill work index 1 For the purists, there were two models in existence at the time: the Von Rittinger and Kick models. Neither of these gave results that matched the observations of specific energy consumption
CONTRIBUTION TO DETERMINATION OF COAL GRINDABILITY
specification of grindability by Hardgrove are applied more frequently. Hardgrove grindability index (HGI) is determining factor of energy consumption during grinding. The HGI value is used for more detailed coal
Study on the Mechanism of Particle Breakage under New
The mechanism of particle breakage was analyzed by the relationships between the efficiency evaluation index and various parameters. The investigation of particle breakage theory and law can help to design and improve crushing equipment, reduce the energy consumption of the crusher
(PDF) SIZE REDUCTION BY CRUSHING METHODS
500 to more than 10,000 t/h are used prov ing for crushing and processing hard roc k, limestone, coal, ore, overburden and other minerals in open p it pines and quarries. Citations (1)
Bibliography: Specific energy consumption models
Charles, R.J., EnergySize Reduction Relationships in Comminution, Transactions AIME, January 1957, Pages 80 88 OneMine link; Hukki, R. T., Proposal for a Solomonic Settlement Between the Theories of Von Rittinger, Kick and Bond
421 PPT Chapter 6 Comminution.pdf CME 421 Mineral
CME 421 Mineral Processing 6. Comminution (crushing, grinding) Qi Liu Department of Chemical and Materials Engineering University of Alberta, Edmonton, Alberta T6G 1H9 Email: [email protected]
Breakthrough in Clinker Grinding
Nov 08, 2012· Bond’s work index is given below: The indices derived by Kick, Bond and Von Rittinger all assume a constant energy requirement per unit of size reduction regardless of the particle size range. Industrial and laboratory results indicate that the energy
QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE
Determination of the energy consumption for ore grinding in a Bond ball mill requires samples of standard size, because changes in the size of the samples cause the change of the Bond work index (Magdalinovic et al., 2012). Due to the Bond test complexity
(PDF) A quick method for bond work index approximate value
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
Prasher, P.L. 1987. Crushing and Grinding Process Handbook
All the three classical models such as Rittinger’s, Kick’s and Bond’s law were found suitable to explain the energy consumption for grinding. Energy consumption increased exponentially with decrease in classifying screen size of hammer mill. The Work index for grinding increased with increase in size reduction ratios and were in the range
SIZE REDUCTION Universiti Teknologi Malaysia
Equations to estimate energy due to : Bond (1952) Kick (1885) should be the power consumption if the capacity is increased to 12 ton/h WORK INDEX Include friction in the crusher & power Material Specific gravity Work Index, W i Bauxite 2.20 8.78 Cement clinker 3.15 13.45
CONTRIBUTION TO DETERMINATION OF COAL GRINDABILITY
specification of grindability by Hardgrove are applied more frequently. Hardgrove grindability index (HGI) is determining factor of energy consumption during grinding. The HGI value is used for more detailed coal specification and is significant also for the design of
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Do Ball Mills Require Water For Coal Processing; Crushing Energy Consumption Coal Kick Bond Index; Lowongan Perusahaan Coal Mining 2012; Ball And Tube Coal Pulverizer; Environmmental Impact Of Coal Mining; Working Principle Of Coal Mill Pulverizer; How And Where Is Coal Mined And Processed; Capex Of Coal Mining; Palembang Coal Mine Selling Price
DISINTEGRATION OF ROCK BY TENSION
a doubleroll crusher for coal and overburden, 2,000 mm diameter, 2,000 mm width, on a semimobile crushing plant. Impact jaw crusher type 5 goh with a feed opening of 800 †~ 630 mm, for crushing iron slag. This model has an especially effective overload protection. Capacity: 150 t/h to 0120 mm.
Study on the Mechanism of Particle Breakage under New
The mechanism of particle breakage was analyzed by the relationships between the efficiency evaluation index and various parameters. The investigation of particle breakage theory and law can help to design and improve crushing equipment, reduce the energy consumption of the crusher, and improve the quality of the broken product.
Bibliography: Specific energy consumption models
Charles, R.J., EnergySize Reduction Relationships in Comminution, Transactions AIME, January 1957, Pages 80 88 OneMine link; Hukki, R. T., Proposal for a Solomonic Settlement Between the Theories of Von Rittinger, Kick and Bond, Transactions AIME, Vol 223, 1962, Pages 403 408 OneMine link
Size reduction (GIKI) SlideShare
Oct 10, 2014· • Bond has suggested a law intermediate between Rittinger’s and Kick’s laws, by putting p = −3/2 in the general equation: • Writing C = 5Ei then: • Bond terms Ei the work index, and expresses it as the amount of energy required to reduce unit mass of material from an infinite particle size to a size L2 of 100 μm, that is q =∞. 7.
Breakthrough in Clinker Grinding
Nov 08, 2012· Bond’s work index is given below: The indices derived by Kick, Bond and Von Rittinger all assume a constant energy requirement per unit of size reduction regardless of the particle size range. Industrial and laboratory results indicate that the energy required for size reduction increases as the product particle size decreases.
421 PPT Chapter 6 Comminution.pdf CME 421 Mineral
CME 421 Mineral Processing 6. Comminution (crushing, grinding) Qi Liu Department of Chemical and Materials Engineering University of Alberta, Edmonton, Alberta T6G 1H9 Email: [email protected] Office phone: 7804928628 Cell phone: 7809157625 1
Relationships between comminution J energy and product
The general form of Bond’s equation is as follows: [6] where W is the work input (kWh/t); Wi is the work index (kWh/t) which expresses the resistance of the material to crushing and grinding; and F80 and P80 are the 80% passing size of the feed and the product ( m), respectively. Bond developed a standard laboratory test for the
CONVENTIONAL CLINKER GRINDING A NEW APPROACH TO
8.44 x 109 GJ (energy from fossil fuels) for a mean energy consumption of 4.0 GJ/tonne cement (CEMBUREAU, 2004). Additionally, 110 kWh/tonne cement electrical energy is consumed in cement production (raw meal crushinggrinding, homogenisation, clinker burning and cooling, finish milling, conveying, packing and loading, etc.).
QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE
Determination of the energy consumption for ore grinding in a Bond ball mill requires samples of standard size, because changes in the size of the samples cause the change of the Bond work index (Magdalinovic et al., 2012). Due to the Bond test complexity
Prasher, P.L. 1987. Crushing and Grinding Process Handbook
All the three classical models such as Rittinger’s, Kick’s and Bond’s law were found suitable to explain the energy consumption for grinding. Energy consumption increased exponentially with decrease in classifying screen size of hammer mill. The Work index for grinding increased with increase in size reduction ratios and were in the range
SIZE REDUCTION Universiti Teknologi Malaysia
Equations to estimate energy due to : Bond (1952) Kick (1885) should be the power consumption if the capacity is increased to 12 ton/h WORK INDEX Include friction in the crusher & power Material Specific gravity Work Index, W i Bauxite 2.20 8.78 Cement clinker 3.15 13.45
METE 254 Mineral Processing I
The equation that Bond developed for this calculation was W = predicted mill energy consumption (kWh/t) Wi = Work Index (kWh/t) 100 = 100 µm, which is the product size in the definition of Work Index P, F = 80% passing sizes (µm) This equation is also commonly written as knust.edu.gh 10 Energy
Relationships between comminution J energy and product
The general form of Bond’s equation is as follows: [6] where W is the work input (kWh/t); Wi is the work index (kWh/t) which expresses the resistance of the material to crushing and grinding; and F80 and P80 are the 80% passing size of the feed and the product ( m), respectively. Bond developed a standard laboratory test for the
DISINTEGRATION OF ROCK BY TENSION
a doubleroll crusher for coal and overburden, 2,000 mm diameter, 2,000 mm width, on a semimobile crushing plant. Impact jaw crusher type 5 goh with a feed opening of 800 †~ 630 mm, for crushing iron slag. This model has an especially effective overload protection. Capacity: 150 t/h to 0120 mm.
Bibliography: Specific energy consumption models
Charles, R.J., EnergySize Reduction Relationships in Comminution, Transactions AIME, January 1957, Pages 80 88 OneMine link; Hukki, R. T., Proposal for a Solomonic Settlement Between the Theories of Von Rittinger, Kick and Bond, Transactions AIME, Vol 223, 1962, Pages 403 408 OneMine link
CORE
Crushing and milling energy requirements are discussed with specific reference to the energy models proposed by Bond and Rittinger along with the shortcomings of both these models. These models postulate that the comminution energy is an inverse function of product size. Kick proposed that the energy requirements are a function of the
CONVENTIONAL CLINKER GRINDING A NEW APPROACH TO
29/6/2006 3 ENERGY IN CEMENT PRODUCTION Thus, the total energy consumed annually for the world cement production is: (8.44 x 109 GJ+2.088 x 109 GJ) =GJ) =10.328 x 10.328 x 109 GJ Since, the world total (2004) primary energy consumption was about 420 Quads Btu corresponding to 443.1 x 109 GJ, the percentage of the energy consumed by the
Size reduction (GIKI) SlideShare
Oct 10, 2014· • Bond has suggested a law intermediate between Rittinger’s and Kick’s laws, by putting p = −3/2 in the general equation: • Writing C = 5Ei then: • Bond terms Ei the work index, and expresses it as the amount of energy required to reduce unit mass of material from an infinite particle size to a size L2 of 100 μm, that is q =∞. 7.
Design, Fabrication and Testing of a Double Roll Crusher
The energy consumption for crushing an ore is a function of its hardness, feed sizes and product sizes. The standard measure of energy demand is Bond work index. The work index, w i, represents the kilowatt hours per tonne required to reduce the material from theoretically infinite feed size to 80
Journal of Mining and Metallurgy, 52 A (1) (2016) 11 25
a 41% decrease in specific energy consumption in pilot scale testing of magnesite in late 1970s due to external re Additional Bond index tests were conducted on standard 3.35 mm Bond test feed, 2.36 mm crushed feed, and HPGR Bond tests was prepared by stage crushing 30 kg of the 10 mm sample to pass 3.35 mm. Half of the 3.35 mm
Investigation of the influence mechanism of rock damage on
Then, a singlepick cutting model of different damaged rocks was established. Through this model, the rock crushing process and cutting force during the cutting were obtained, and the influence of rock damage on the cutting mechanism was explored. Furthermore, the effect of rock damage on cutting force and cutting energy consumption was studied.
POSSIBILITIES OF IMPLEMENTING BIMETALLIC HAMMER
CONSUMPTION OF ENERGY IN CRUSHING PROCESS All types of crushing process are very inefficient in terms of energy consumption. Degree of efficiency can be calculated by Eq. (1) 1 : Energy for surfacecreation Energyapsorbedbymaterial e AA s W n 21 (1) where es is the surface energy per unit area and Wn is the energy absorbed. Crushing efficiency c
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