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Rittinger's law is applicable mainly to that part of the process where new surface is being created and holds most accurately for fine grinding where the increase in surface per unit mass of material is large

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### rittingers law fine grinding

rittingers law fine grinding Mar 25, 2015 Rittingers Law The energy required for reduction in particle size of a solid is directly proportional to the increase in surface area. E K R f c (1/L 2 1/L 1 ) Kicks Law The amount of energy required to crush a given quantity of material to a

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

Jun 01, 1973 CONCLUSION Two distinct forms of the empirical general law of grinding exist: first, - dx dE= =CI where or -t - so dP(x, t) 1/Ji xn_ I 0 n I log (x/xe) _ -'.__ log (x/x,) dP (x, t), rI = I When n=1, this is Kick's law, when n=2 it is Rittinger's law, and integration gives r x~ E Ln-II 1[f 0 (1/x I)dP(x, t) ma or s~a~ (1/xn-I)dP(x, 0)] , rtr 1 (6a) 0 xmn= E= CI b log(x/xo)dPlx, t) 0 . log (x/xo) dP (x, 0)1 n =I

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### Unit Operations in Food Processing - R. L. Earle

Equation (11.3) is known as Rittinger's Law. As the specific surface of a particle, the surface area per unit mass, is proportional to 1/ L , eqn. (11.3) postulates that the energy required to reduce L for a mass of particles from 10 cm to 5 cm would be the same as that required to reduce, for example, the same mass of 5 mm particles down to 4.7 mm

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### CHAPTER 11 SIZE REDUCTION - NZIFST - Home

Grinding and cutting reduce the size of solid materials by mechanical action, dividing them into smaller particles. Perhaps the most extensive application of grinding in the food industry ... Equation (11.3) is known as Rittinger's Law. As the specific surface of a particle (the surface area per unit mass) is proportional to 1/L, eqn. (11.3)

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### Rittinger and Kick's Laws of Crushing

Mar 08, 2016 Either in pushing (or pulling) back the crushing faces, or, in accordance with a more universal law of nature, attacking the weaker part of the organization and completing the breaks upon the parts that have increased load put upon them by breaks alongside them

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### Unit OperatiOn Size Reduction

It has been found, experimentally, that for the grinding of coarse particles in which the increase in surface area per unit mass is relatively small, Kick's Law is a reasonable approximation. For the size reduction of fine powders, on the other hand, in which large areas of new surface are being created, Rittinger's Law fits

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### 4 Size reduction - UB

grinding in which there is a relatively small increase in surface area per unit mass. Rittinger’s law gives better results with fine grinding where there is a much larger increase in surface area and Bond’s law is intermediate between these two. However, equations (4.2) and (4.3) were developed from studies of hard materials (coal and

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### Rock Crushing Theory and Formula using Kick & Rittinger's

Mar 11, 2016 Rittinger’s Law: Rittinger’s theory is the law of the cracks. It is well explained in an article by E. A. Hersam in the Mining and Scientific Press, an abstract of which is given in the third volume of Richard’s Ore Dressing, and to which I acknowledge my indebtedness for some of my ideas and,methods. The mathematics of this theory follow:

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### Size-reduction process mechanism and evaluation

Rittinger’s law states that the energy required for size reduction is proportional to the change in surface area of the particles. Rittinger’s law gives better results with fine grinding where there is a much larger increase in surface area. According to Rittinger, the D and d should be calculated as follows:

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### Relationships between comminution J energy and

and over 150 batch grinding tests and sieve sizing were carried out. Throughout the grinding tests, power draw was continuously monitored. The relationship between the grinding energy and product size was analysed using the conventional energy-size concepts. It was found that the Rittinger equation fits the experi-mental data well

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### The Efficiency of Grinding - Pharmaceutical Engineering

Kick’s law predicts lower energies than the relation proposed by Rittinger. The theory, however, demands that the resistance to crushing does not change with particle size. The role of flaws present in real materials is not considered with the result that the energy required for fine grinding, when the apparent strength may have greatly risen

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### size reduction,laws involved in size reduction

Oct 25, 2016 • Rittinger’s law gives better results with fine grinding where there is a much larger increase in surface area • Bond’s law is intermediate between these two. However,equations Rittinger’s law and Bond’s law were developed from studies of hard materials (coal and limestone) and deviation from predicted results is likely with many

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### Grinding Mills - Grinding Laws | Technology Trends

Grinding Laws. In spite of a great number of studies in the field of fracture schemes there is no formula known which connects the technical grinding work with grinding results. To calculate the needed grinding work against the grain size changing three half-empirical models are used. ... Von Rittinger for d 0.05 mm; with W as grinding work in

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### 250+ TOP MCQs on Size Reduction – Grinding Principles and

8. Which of the law is used for fine grinding? a) Rittinger’s Law b) Kick’s Law c) Bond’s Law d) Bond’s Law, Rittinger’s Law, and Kick’s Law Answer: a Clarification: Rittinger’s Law is defined as the energy required for reducing the size of the solid particle is directly proportional to the increase in surface area

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### Effect of Moisture Content on the Grinding Process and

Grinding is a staple size-reduction process to produce food powders in which the powdered form is chemically and microbiologically stable and convenient to use as end products or intermediate products. The moisture content of food materials before grinding is a particularly important factor, since it determines the materials’ physical properties and the powder properties, such as flowability

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### (PDF) Comminution energetics part III : Bond's law and

GRINDING LAWS The three laws of Rittinger, Kick and Bond can all be derived from the follow- ing relationship, proposed by Charles (1957), between energy consumed and mate- rial size C.51 : &=-kg Yn Setting the exponent n to 1, 11 or 2 upon integration defines the laws of Kick, Bond and Rittinger

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### The size reduction theories of solid foods

the grinding laws. THE GRINDING LAWS The amount of energy required for size reduction of solid foods can be theoretically calculated based on the following equation: d d , n x E K x = − (1) where: dE is the energy required in breaking a unit mass of diameter x about size dx, K and n are constants depending on the ground material and grinding

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### However excessive moisture in a dry food can lead to

However, excessive moisture in a ‘dry’ food can lead to agglomeration of particles which then block the mill and very dry foods create excessive dust which causes a health hazard, and is extremely inflammable and potentially explosive. Substantial amounts of heat are generated in high-speed mills

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