Capacities and performance characteristics of jaw crushers

By using the data of E.A. Hersam and F.C. Bond's equation for energy consumption in comminution, a method was developed to analyze the performance of industrial jaw crushers. The study showed that industrial jaw crushers are generally operated below capacity. The study also showed that industrial jaw crushers generally have sufficient installed …

CPE: Lesson 15. Empirical laws of Size Reduction

A material consisting originally of 20 mm particle crushed to an average size of 5 mm and required 30 kJ/kg for this size reduction. Determine the energy required to crush the material from 20 mm to 3 mm assuming (a) Rittinger's law, (b) Kick's law and (c) Bond's Law. Solution: (a) Applying Rittinger's law as expressed by equation (4.10)

bonds law equation in crusher

Bonds Law Equation In Crusher. Read More bonds law for crushing-uniekebruidstaarten.nl Bond (1952) proposed the 'Third Law' of is applicable for crushing, Rittinger's equation may be used the final stage of crushing to. Consulta · The results given by this formula may be checked by inspection and a slide rule for those cases where the unit ...

Comminution

As with any material, rock particles only break when the applied tensile stress exceeds the tensile strength of the rock. However, in terms of comminution, the main interest is to derive reliable ways of assessing how a particular material breaks in a comminution device such as a crusher or a mill [].In general, the breakage of rock particles is dependent on two factors: …

Bond´s work index estimation using non-standard ball mills

The Bond Work Index (Wi) is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. ... (Equation 2). 2 Physicochem. Probl. Miner. Process. 59(6 ...

Bond Work Index

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 …

How to calculate the power for a stone crusher which

You can calculate power required by the bonds law of crushing. For more about the bonds law, see the link below

An Overview on Size-Reduction

Bond Law: States that the work required to form particles of size from the very large feed is proportional ... Roll crushers are used for producing additional reductions in the size of stones. A roll crusher consists of a heavy cast from frame equipped with either one or more hard steel rolls, each

size reduction

Bond has proposed a law intermediate between Rittinger's and Kick's law for estimating the power required for crushing and grinding operations. It states that the work required to form particles …

A commentary on the Kick, Bond and Rittinger laws of grinding

Confusion concerning the so-called general law of grinding proposed by Walker et al. is removed when it is realised that two forms of the law exist, quite different in physical meaning. The Kick and Rittinger laws are special cases of one form, and Bonds law is a special case of the other. Thus it is possible for Rittinger's and Bond's laws to ...

Rittinger and Kick's Laws of Crushing

And Kick's law would apply to these, but the effect of the energy absorbed by these few crystals would have no appreciable effect upon the total of energy absorbed when actual crushing takes place. I consider that the above reasoning applies to bodies in tension, shearing, or compression; it can be shown, I believe, that these three phenomena ...

Bond Work Equation For Jaw Crusher

how does a jaw crusher work? - diebold-bau.eu. How does a crusher work - qaanswers. Crusher is divided into many kinds, because of their work principle Generally divided into two categories, one is laminated crusher, another is the impact crusher the laminated crusher like jaw crusher broken by extrusion materials,and the impact crusher is rely on the hammer of crush on the …

Summary of results from Bond crushability and impact load cell …

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.

How Material Size Directly Affects Size Reduction Energy

Bond's Law: The work required to form particles from very large feed is proportional to the square root of the surface-to-volume ratio. E = K B f c [(1/L 2 ) 1/2 - (1/L 1 ) 1/2 ] Rittinger's Law — The energy required for reduction in particle size of a solid is directly proportional to the increase in surface area.

Distribution of impact (crushing) work index for selected …

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.

Chapter 6 Comminution

Later Hukki [22] included Bond's third 'law' of comminution (n¼1.5): ... Hukki [22] suggested that the exponent n in the general comminution equation is not in fact a constant, but a variable dependant on the particle size (Fig. 6.2). There are many experimental results in favour of the theory of Rittinger [49],

Crushing in Mineral Processing

Bond's impact method comes from a double mirrored pendulum impact crusher test on <76mm but >51mm (3″ and 2″) square rock pieces. The resulting consumed power is calculated using Bond's standard equation. See how BWi relates to Ai. A Crusher' Settings 3 main parameters are changed to obtained a targeted P80 product size:

Theory of Size Reduction

Most popular comminution laws are those proposed by Kick, Rittinger and Bond. Kick's Law (1885): ... The chemical losses due to friction and inertia in the grinding equipment are not accounted in Rittinger's law. These mechanical losses of the crusher can be predicted by running the crusher empty without any charge. Thus overall energy ...

Capacities and performance characteristics of jaw crushers

trial jaw crushers was analyzed using the proposed equation in combination with that of Bond (1961) for calculating the energy requirement in size reduction. The equation for capacity The volumeof material (V) that passes through the crusher bottom opening per stroke is given by: If the machine is run at low speeds, the movement of the

14 Size ranges applicable to Von Rittenger, Kick, …

Bond's law has the largest number of variations. In which the work index parameter is used as a proportionality factor. However, the parameter of the Bond work index has a wide range of...

A quick method for bond work index …

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 energetics part III : Bond's law and …

but the the Bond law as a feed size pass- size passing a certain spent on a specific bren function by the batch equation size in a faster grind than what was to the Bond law with a factor of 100, further as determined bren 121. Many reasons may be possible, is that defining ground determine results parameter.

14 Size ranges applicable to Von Rittenger, Kick, and Bond equations

(4) In the source [14] it is noted that the value of specific crushing energy for jaw crushers is within 0.828-1.98 kJ/kg. ...

bonds law equation in crushers

Bond 1961 Crushing and Grinding Calculations . The product sizes of jaw crushers and primary gyratory crushers with steep crushing cones are controlled principally by the open side setting of the crusher Where ass is the open side setting of the crusher in inches at the bottom of the crushing chamber the 80 per cent passing size P of the crusher product in microns is …

Mechanical Operations Questions and Answers

Explanation: The above equation represents the Bond's law, where P is the power required and m is the mass of the feed and K b is the Bond's constant. advertisement 8.

BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T

Work index is the relation between the SEC and the amount of breakage in an ore. The most common form of this relationship is given as Equation 1, and is often referred to as "Bond's …

Assessing the energy efficiency of a jaw crusher

The aim of the present work is to understand the reasons for inefficiency and to improve the efficiency of comminution machinery. Bond's Work index coefficients cover almost the entire range of particles to be processed using commercial equipment [4].With this theory, the energy requirements are based on experimental shaft energy measurements of comminution …

Bond Work Index Formula-Equation

The basic work index equation is: W = 10 Wi/√P – 10 Wi/√F(1) where W is the work input required in kilowatt hours per short ton to grind from 80% passing F microns to 80% passing P microns, and Wi is the work index, or the grinding resistance parameter. It represents the energy input required in kilowatt hours to …

Calculate Top Ball Size of Grinding Media -FRED C. BOND Equation

1. The first study was to determine if either of the two existing theories of comminution the Rittenger theory or the Kick theory were correct. Bond concluded that neither was correct. He developed a theory that the energy required for comminution was a function of the difference in the square root of the size of the particles in the feed and in the product of the …

Compare and Understand Rod/Ball/Impact …

The median Bond ball mill work index and Bond rod mill work index will be similar for most projects, thought significant variation can manifest for any one particular sample. Relation of Bond ball mill work index and …

Size Reduction

Kick's law is more suitable where coarser grinding takes place. This particular equation is valid for bigger particle size, for example, size reduction from 12 cm to 6 cm or from 6 cm to 3 cm. 6.6.3 Bond's Law. This law was developed by the Fred Chester …

1 Crushing

The smaller crushers have a higher rate of stroke speed than the larger crushers, and this will vary from 90 strokes per minute for a crusher with a 165 cm (66 in.) gape opening up to 240 strokes per minute for a 60 cm (24 in.) crusher. Gyratory Crushers Gyratory crushers are the second class of primary crushers and were developed

How Material Size Directly Affects Size Reduction …

Bond's Law: The work required to form particles from very large feed is proportional to the square root of the surface-to-volume ratio. Rittinger's Law — The energy required for reduction in particle size of a solid is directly …

bonds law equation crushers

Bonds Law Equation In Crushers Bonds Law Equation In Crushers Chemical Engineering Stop Bonds Law May 14, 2010 Bonds law Bond postulated that work required t

Bond Impact Crushing Work Index -Procedure and Table of …

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 open-side settings ( jaw crushers and gyratory crushers) or closed …