# rittinger law specific grinding

• ### Size Reduction EquipmentBIT Mesra

· Assume that Rittinger slaw is applicable. •It is desired to crush 10 ton/hr of iron ore hematite. The size of the feed is such that 80 passes a 72.6 mm screen and 80 of product a 3.175mm screen. Calculate the gross power requirement for wet grinding and dry grinding. Work index of Hematite is 12.68 Ans 17.96kW

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• ### CPE Lesson 15. Empirical laws of Size Reduction

15.1 Rittinger s law Rittinger s assumption was based on the fact that particles do not deform before breaking therefore being infinitely brittle.Rittinger state that the energy required in size reduction is proportional to new surface created and gave the power n a value of 2 thus by integrating equation (1.9) obtained the so called Rittinger s law

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• ### Grinding characteristics and batter quality of rice in

Parboiled rice required longer duration of grinding compared to raw rice consequently specific energy consumption was higher ( 220kJ/kg). All the three classical laws of grinding (Kick s Rittinger s and Bond s) seemed to be applicable while Rittinger s law showed better suitability than the other two followed by Bond s law.

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• ### How Material Size Directly Affects Size Reduction Energy

· Rittinger s 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 21/L 1 ) Kick s Law — The amount of energy required to crush a given quantity of material to a specified fraction of its original size is the same regardless of the original size.

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• ### size reduction laws involved in size reduction

· 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 foods. 15. Basic parts of mill • Feed chute/hopper which delivers the material. • Grinding mechanism usually consisting of a rotor and stator.

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• ### Grinding MillsGrinding Laws Technology Trends

Grinding degree is the ratio of the sizes from the grain disposition. There are several definitions for this characteristic value Grinding degree referring to grain size d 80 Instead of the value of d 80 also d 50 or other grain diameter can be used. Grinding degree referring to specific surface

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• ### 11 Crushing and classificationparticles

· In Summary Kick s law is better for larger particles and Rittinger s for fine grinding see Figure11.5. Large particles are easier to break than smaller ones as they have more cracks and faults. Often the laws are used in conjunction with empirically given constants it can be dangerous to use the book values without some test work.

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• ### Unit OperatiOn Size Reductionceng.tu.edu.iq

· where KR is called Rittinger s constant which on integration gives =Ë B Ö 5 Å . − 5 ÅA Rittinger s Law (2) As the specific surface of a particle (the surface area per unit mass) is proportional to 1/L equation (2) postulates that the energy required to reduce L for a mass of particles from 10 cm

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• ### Kick Rittinger BondPowder 0 Technology 7(1973 Elsevler

View Kick Rittinger Bond.pdf from CHE 136 at University of the Philippines Visayas. Powder 0 Technology 7 (1973) Elsevler Sequoia S A A Commentary 315 3 15-3 17 LausannePnnted m The

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• ### SIZE REDUCTIONgputtawar.edu

· Si = initial specific surface area Sn = final specific surface area This theory is used when neither Kick s nor Rittinger s law is applicable. n =2.0 Walker equation becomes Rittinger s theory •It is rapid in action and is capable of grinding many

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• ### Unit Operations in Food ProcessingR. 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. This is a very much smaller reduction in terms of energy per unit mass for the smaller particles than that predicted by Kick s Law.

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• ### CPE Lesson 15. Empirical laws of Size Reduction

15.1 Rittinger s law Rittinger s assumption was based on the fact that particles do not deform before breaking therefore being infinitely brittle.Rittinger state that the energy required in size reduction is proportional to new surface created and gave the power n a value of 2 thus by integrating equation (1.9) obtained the so called Rittinger s law

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• ### Grinding MillsGrinding Laws Technology Trends

Grinding degree is the ratio of the sizes from the grain disposition. There are several definitions for this characteristic value Grinding degree referring to grain size d 80 Instead of the value of d 80 also d 50 or other grain diameter can be used. Grinding degree referring to specific surface

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• ### Grinding Mill Design Ball Mill Manufacturer

· The formula is an expression of Rittinger s Law which is shown by tests to be reasonably accurate up to a specific surface of 10 000 cm²/cm³.

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• ### Energy requirements in size reduction of solids

· In the case of grinding i.e. the size reduction carried out in conventional product and ball mill operations Bond s theory is reasonably applicable. The slope of the curve is about 0.5. In fine grinding range such as grinding of cement etc. Rittinger s law is applicable. The slope of the curve would be approximately-1 71

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• ### P e t r oo cc e mm SS . PP e ette rrs bb u g RR uuss

· 4. Grinding aids 4.1 Creation of specific surface and energy required The increase in the specific surface is related to the energy required for comminution of the particles and consequently also to the grinding time. This relationship is expressed by Rittinger™s law although this is a theoretical derivation and does not consider the energy

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• ### Grinding MillsGrinding Laws Technology Trends

Grinding degree is the ratio of the sizes from the grain disposition. There are several definitions for this characteristic value Grinding degree referring to grain size d 80 Instead of the value of d 80 also d 50 or other grain diameter can be used. Grinding degree referring to specific surface

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• ### Mechanism Grinding AidsHomeC-ADD Mapei

· During the grinding process the increase in the specific surface proportionally decreases with the fineness increase. Rittinger s law demonstrated that there is a direct proportionality within the grinding time and specific surface till a precise fineness (depending on the material and the grinding

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

· Rittinger s law is logical if the specific energy is defined as that necessary to supply the surface energy of the fresh surface produced on fracture. However it is not used with this understanding because E is taken as the mill energy which is quite another matter- If

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• ### How it Works Crushers Grinding Mills and Pulverizers

· Rittinger s Law states that the energy required in size reduction is proportional to the new surface created by the particle fragmentation. The equation for Rittinger s Law can be written as E = K R f c (1/L 21/L 1) Where E=Energy K R =Rittinger s Constant f c =crushing strength of the material L 1 =initial length and L 2

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• ### SIZE REDUCTIONgputtawar.edu

· Si = initial specific surface area Sn = final specific surface area This theory is used when neither Kick s nor Rittinger s law is applicable. n =2.0 Walker equation becomes Rittinger s theory •It is rapid in action and is capable of grinding many

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• ### P e t r oo cc e mm SS . PP e ette rrs bb u g RR uuss

· 4. Grinding aids 4.1 Creation of specific surface and energy required The increase in the specific surface is related to the energy required for comminution of the particles and consequently also to the grinding time. This relationship is expressed by Rittinger™s law although this is a theoretical derivation and does not consider the energy

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• ### Energy consumption of two-stage fine grinding of Douglas

· Figure 7 shows Rittinger s comminution law fitting to the data of three feed sizes and nineteen product sizes and corresponding SECs from rotor impact mill grinding. The Rittinger constant of 104.5 for the rotor impact mill grinding is larger than 58.6 for the hammer mill grinding (Fig. 5) indicating that the hammer mill used less energy

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• ### Grinding characteristics and batter quality of rice in

Parboiled rice required longer duration of grinding compared to raw rice consequently specific energy consumption was higher ( 220kJ/kg). All the three classical laws of grinding (Kick s Rittinger s and Bond s) seemed to be applicable while Rittinger s law showed better suitability than the other two followed by Bond s law.

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• ### Lecture 3 Process Engineering of Size Reduction Mill

· Rittinger s law • Rittinger s Law says that the specific energy (E) of grinding is directly proportional to the new surface area produced. • The energy surface area balance of Rittinger s law in terms of particle sizes is (3.4) Where • is the fraction by weight less than size X of products of fracture

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• ### CPE Lesson 15. Empirical laws of Size Reduction

15.1 Rittinger s law Rittinger s assumption was based on the fact that particles do not deform before breaking therefore being infinitely brittle.Rittinger state that the energy required in size reduction is proportional to new surface created and gave the power n a value of 2 thus by integrating equation (1.9) obtained the so called Rittinger s law

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• ### CHAPTER 11 SIZE REDUCTIONNZIFST

· 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 10cm to 5cm would be the same as that required to reduce for example the same mass of 5mm particles down to 4.7mm. This is a very much smaller reduction in terms of of energy per unit mass for the smaller particles than that predicted by Kick s Law.

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• ### Relationships between comminution J energy and

· Relationships between comminution energy and product size for a magnetite ore 4 where E is the net specific energy x f and x p are the feed and product size indices respectively and K3 is a constant. Hukki (1962) evaluated these energy-size relationships

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• ### Grinding Mill Design Ball Mill Manufacturer

· The formula is an expression of Rittinger s Law which is shown by tests to be reasonably accurate up to a specific surface of 10 000 cm²/cm³. When the grinding resistance c has been determined by trial grinding to laboratory scale the net power E required for each grinding stage desired may be determined by the formula at least as long as

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• ### Kick Rittinger BondPowder 0 Technology 7(1973 Elsevler

View Kick Rittinger Bond.pdf from CHE 136 at University of the Philippines Visayas. Powder 0 Technology 7 (1973) Elsevler Sequoia S A A Commentary 315 3 15-3 17 LausannePnnted m The

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• ### Relationships between comminution J energy and

· Relationships between comminution energy and product size for a magnetite ore 4 where E is the net specific energy x f and x p are the feed and product size indices respectively and K3 is a constant. Hukki (1962) evaluated these energy-size relationships

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