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Bond Impact Crushing Work Index Procedure and Table of
Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According to Bond’s Third Theory of Comminution, the work/energy input is proportional to the new crack tip length created during particle breakage and equivalent to the work
Bond Work Index an overview ScienceDirect Topics
The low energy crushing work index laboratory test is conducted on ore specimens larger than 50 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 Rittinger’s law. Accordingly, the energy consumed in reducing the particle size from x F to x p (both measured as 80%
Testwork: Bond crushing work index SAGMILLING.COM
The Bond lowenergy impact crushing work index (more informally, the Bond crushing work index) is not as common as the Bond ball mill work index, and it is a notoriously noisy test. The test is a 'perspecimen' test where individual specimens of prepared rock are handpicked by the test operator and placed into the apparatus. Typically twenty specimens are chosen to represent a sample and the
Fred Chester Bond Wikipedia
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 the feed and product size distribution. His theory and index were introduced in a widely cited 1952 journal article. Bond called his theory the "third theory of comminution", counting those of Peter von Rittingerand Friedrich Kick as the first and second. This term and the terminology of "laws of comminution", as in "Rittinger's law", "
bonds crushing law and work index shibangchina
Chapter 3 Particle Technology (Size Reduction) Kick’s law: the work required for crushing a given mass of material is constant for the same reduction ratio, 3.2.2 Bond crushing law and work index.
bonds law for crushing ressourcesetstrategies.fr
The work index in Bond's law for crushing of solids has. 116 Crushing and classification ∝ − 3 i 5/2 i 3 f 5/2 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 µm, hence the 10 inside the brackets. Bond's Work Index values, in kWh per
The work index in Bond's law for crushing of solids has
The work index in Bond's law for crushing of solids has the following dimensions a) No units (dimensionless) b) KWh/ton c) KW/ton d) KWh.m 1/2 /ton
(PDF) A quick method for bond work index approximate
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
Rittinger's, Kick's and Bond's Crushing Laws YouTube
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bonds law for crushing ressourcesetstrategies.fr
The work index in Bond's law for crushing of solids has. 116 Crushing and classification ∝ − 3 i 5/2 i 3 f 5/2 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 µm, hence the 10 inside the brackets. Bond's Work Index values, in kWh per
The work index in Bond's law for crushing of solids has
The work index in Bond's law for crushing of solids has the following dimensions. A. No units (dimensionless) B. KWh/ton. C. KW/ton. D. KWh.m 1/2 /ton. Answer: Option B
CORRELATION BETWEEN BOND WORK INDEX AND
meaning is expressed include the Rittinger number, crushing resistance, Hardgrove index and Bond work index. The Bond work index is regarded as one of the crushing resistance; it can therefore be presumed that the Bond work index is correlated to the mechanical properties of materials [4].
(PDF) A quick method for bond work index approximate
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
Kicks LawIt state that the work required for crushing a
Bond’s Law and Work Index ?? =??? 푝 To use this eqn., a work index W i is defined as the gross energy required (in KW.h/ ton) by feed in order to achieve 80% of the product passes a 100 μm screen. This definition leads to a relation between Bond’s constant (K b) and W i. This definition leads to a relation between K b and W i.
Bond Work Index Tests Grinding Solutions Ltd
The Bond LowEnergy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index. The test determines the impact energy at which a specimen fails and allows approximation of net power requirements for sizing crushers. The open and closed sized settings for given product sizes can also be determined.
FM 306: SIZE REDUCTION AND SIEVING IIT Bombay
Bonds law is often written in terms of the work index (Wi) as, Where the work index is defined as the energy required per unit mass in kWh/ton to reduce an infinitely large particles to D80 = 100 μm. In the above equation, unit of D80 is in mm, of ‘W’ is kWh and of ‘m’ is in ton. Work index for common materials is Material Wi (kWh/ton)
Comparison of UCS to Bond Work Indices
are the Bond Work Index (Wi) values (Bond, 1952), divided into a low energy crushing work index (Wi C) for coarse rocks (7550 mm), a rod mill work index (Wi RM) for intermediate sized particles (253 mm), and a ball mill work index (Wi BM) for small particles (<3 mm) (Ammtec, 2000). Laboratory
Investigation into the applicability of Bond Work Index
15/10/2015· where W is the work input (kW h/t), W i is the Bond Work Index (kW h/t) which expresses the resistance of the material to crushing and grinding, and F 80 and P 80 are the 80% passing size of the feed and product (μm) respectively.
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
The work index in Bond's law for crushing of solids has
The work index in Bond's law for crushing of solids has the following dimensions a) No units (dimensionless) b) KWh/ton c) KW/ton d) KWh.m 1/2 /ton
Bond Work Index Tests Grinding Solutions Ltd
The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a predefined media and ore charge. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stagecrushed to 100% passing size of <3.35 mm. Any screen size below 600µm can be used for the testwork
FM 306: SIZE REDUCTION AND SIEVING IIT Bombay
Bonds law is often written in terms of the work index (Wi) as, Where the work index is defined as the energy required per unit mass in kWh/ton to reduce an infinitely large particles to D80 = 100 μm. In the above equation, unit of D80 is in mm, of ‘W’ is kWh and of ‘m’ is in ton. Work index for common materials is Material Wi (kWh/ton)
Size Reduction and Energy Requirement ScienceDirect
01/01/2016· The impact crushing strength of rocks so determined is used to calculate the Bond crushing work index using the expression applying Newton’s law of conservation of energy, the coefficient of restitution will be (3.18) ε = − v B 1 − v S 1 v S o. The energy for crushing, E, is the difference between the energy of the input pendulum and the energy of the rebound pendulum and is
Bond Crusher Work Index greenrevolution.org.in
bonds crushing law and work index. bond crushing work index of copper slag Gold Ore Crusher. Bond crushing work index OneMine Mining and Minerals Library search results. Register The Cadia Gold Copper Project Exploration To Start Up : SUMMARY. Read more. LAARMANN321 Кб. 1500 x 675 x 1200 mm 300 kgs (only machine) 230V/50Hz/60Hz Variable 080 rpm 0.75KW Bond Crushing Work Index
SCREENING AND CRUSHING chemical engineering review
1. Rittinger’s Law: n = 2 . K r is Rittinger’s Constant . 2. Kick’s Law: n = 1 . K k is Kick’s Constant . 3. Bond Crushing Law: n = 1.5 . W i is Work index in KWh/ton and D in mm . Example 4: Calculate the Power required to crush 50 ton/h of coke given the following data: W i = 115.13 KWh/ton Feed particle diameter = 50 mm Product
Bond Tests 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’s Third Theory of Comminution to calculate net power requirements when sizing crushers*. It is also used to determine the required openside settings (jaw
3 size reduction
21/09/2019· Bond crushing law(1952) and work index (intermediate relationship with P = 3/2 = 1.5) The work required to form particles of size Dp from very large feed is proportional to the square root of the surfacetovolume ratio of the product, sp/vp. 12 11 2 LL CE qL EE i 1 1 100 2 where q = L1/L2 C = 5Ei and 20. Ei the work index The work index, Ei, is defined as the gross energy required in KWH
Relationships between comminution J energy and product
However Bond’s Third Law can be reasonably applied to the range in which ball/rod mills operate in. In spite of the empirical basis of Bond’s theory, it is the most widely used method for the sizing of ball/rod mills and has become more likely a standard. 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
bonds law of size reduction wikipedia « BINQ Mining
Empirical relationships: Rittinger's and Kick's law Bond crushing law and work index »More detailed. What is bond's law of crushing Wiki Answers. Bond postulated that work required to form particles of size Dp from very large What is the relationship between Rittinger's law Kick's Law and Bond's Law? »More detailed. 11 Crushing and classification Particle Technology. An
FM 306: SIZE REDUCTION AND SIEVING IIT Bombay
Bonds law is often written in terms of the work index (Wi) as, Where the work index is defined as the energy required per unit mass in kWh/ton to reduce an infinitely large particles to D80 = 100 μm. In the above equation, unit of D80 is in mm, of ‘W’ is kWh and of ‘m’ is in ton. Work index for common materials is Material Wi (kWh/ton)
A procedure for rapid determination of the Bond work
01/09/1989· The abbreviated procedure for finding the work index is as follows: (1) The work index is determined from feed crushed to 100% minus 3.327 mm (the same as for the standard Bond test). (2) The feed is screened to determine its size distribution which is then plotted on a graph. (3) A 700 cm3 sample is collected and weighed (M). (4) The value of R = (2.5/3.5)M is calculated. (5) From the
Investigation into the applicability of Bond Work Index
15/10/2015· The Bond Work Index (BWI or W i) is defined as the calculated specific energy (kW h/t) applied in reducing material of infinite particle size to 80% passing 100 μm . The higher the value for W i, the more energy is required to grind a material in a ball mill,.
SIZE REDUCTION Universiti Teknologi Malaysia
CRUSHING EFFICIENCY where Bond’s Law: work required using a largesize feed is proportional to the square root of the surface/volume ratio of the product K b = constant P = power required = feed rate m Ý P m. 0.3162W i 1 D pb 1 D pa § © ¨ ¨ ¨ ¨ · ¹ ¸ ¸ ¸ where ¸ W i = work index D pa,D pb = dia. of feed & product, respectively (mm) P m. K b 1 D pb 1 D pa § © ¨ ¨ ¨ ¨ · ¹ ¸ ¸ ¸ ¸
MECHANICAL OPERATION LAB MANUAL
1) Energy required for crushing E=[nwgh] ÷ [m] kW hr/Ton 2) Volume surface mean diameter of the product Dp=[1÷ ∑xi/D pi 3]1/3 3) Work Index[Bond’s law constant) Wi=[E] ÷[1/ ∫Dp1/∫Df] 4) Rittinger’s constant KR fc=[E] ÷[1/Dp1/D f] 5) Kick’s Constant KKfc=[E]÷1n(D f/D p) RESULT: The crushing law constants are determined
Operating work index is not the specific energy
I use the convention that the symbol E is specific energy, but the symbol W (for Work) is also valid; Bond used the W notation in his writings. The Work Index is a fitted coefficient to Bond's
Based on Bonds Crushing Law the power required to
• Based on Bond's Crushing Law, the power required to crush a certain material will change by % if the diameter of the product is made smaller by 50%. • In crushing a certain ore, the feed is such 80% is less than 50.8 mm in size and the product size is such that 80% is less than 6.35 mm.
Comparison between bond crushing energy and fracture
suitable for grinding. The Bond crushability index, which is estimated using a standard impact crushability test, is suitable for crushing21. Because the jaw crusher was modelled in this study, the Bond crushability index of the rocks studied was determined. To study fracture mechanisms of the rocks in the
Comminution Wikipedia
Kick's law, which related the energy to the sizes of the feed particles and the product particles; Bond's law,which assumes that the total work useful in breakage is inversely proportional to the square root of the diameter of the product particles, [implying] theoretically that the work input varies as the length of the new cracks made in breakage.
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