Size reduction ppt. 1. S.S.P. SHIKSHANSANTHA'S SIDDHI COLLEGE OF PHARMACY SIZE REDUCTION Ms. Saroja P. Adepawar Department of Quality Assurance Techniques. 2. Introduction Definition- Size reduction is the process of reducing substances to smaller particles OR Process of reducing large solid unit masses into small unit …

Size reduction ppt - Download as a PDF or view online for free. ... • The gap between rollars can be adjusted to control the degree of size reduction. Uses: It is used for crushing & cracking of seeds before extraction of fixed oil from the same. It also used to crush soft tissues, to help in the penetration of solvent during extraction ...

REDUCTION: Impact- particle size reduced by a single rigid force (hammer). Compression- in this mode material is crushed between rollers by the application of pressure. Attrition- arising from particles …

7 2.5 Grinding is the stage of size reduction (wet or dry) where the liberation size for individual minerals can be reached. Size reduction by crushing has a size limitation for the final products.

Size reduction is a process of reducing large solid unit masses, coarse particles or fine particles. Size reduction may be achieved by two methods: 1] Precipitation 2] Mechanical process 1] Precipitation method: Substance is dissolve in appropriate solvent. 2] Mechanical process: Mechanical force is introduce by using different equipments like ...

Crushing and grinding are known as comminution procedure where the major operations are intensively related to liberation and reduction of particle size by means of different technologies.

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If n=2.0 equation (2) becomes Rittinger's theory. 24. Rittinger's theory According to this theory energy E required for size reduction of unit mass is directly proportional to the new surface area produced. E=KR (Sn – Si) …. (3) Where Si = initial surface area Sn = new specific surface area KR = Rittinger's constant.

4.3.1 Dry Milling. As mentioned above, particle-size reduction in dry mills occurs by pressure, friction, attrition, impact, or shearing by particle–particle or particle–equipment interactions. Even though a variety of mills are available for decreasing the particle size, some common issues can be identified.

A Review on the Technology of Size Reduction Equipment A. Kumar1,3* and R. Yedhu Krishnan2,3 1Department of Chemical Engineering, 2Department of Biomedical Engineering, 3Saveetha Engineering College, Thandalam, Chennai – 602105, India Abstract : Size reduction or comminution is among the most comprehensively used unit operation of …

Embed Size (px) 344 x 292 429 x 357 514 x 422 599 x 487. Size reduction. Size-Reduction Equipments. Gyratory crusherPrimarySecondary Cone crusher. Gyratory CrusherPrimary Gyratory crusher. Crushing rollsSmooth roll crusherToothed roll crusher. Smooth roll crusher. Tumbling MillsBall millsTube millsRod mills. Ball millPrinciple: …

Size reduction is a process of reducing large solid unit masses into small unit masses, coarse particles or fine particles. Size reduction process is also termed as Comminution or Diminution or ...

4 4.2 Size control: Neither crushers nor grinding mills are very precise when it comes to the correct sizing of the end products. The reason is to find partly in the variation of the mineral ...

characteristic governing size reduction is hardness because almost all mechanical size reduction techniques involve somehow creating new surface area, and this requires adding energy proportional to the bonds holding the feed particles together. A common way of expressing hardness is the Mohs scale, on which talcum is a 1 and diamond is a 10.

7. Mechanism of Size Reduction – Grinding of Coal. 8. Description With increased crushing, the particle becomes finer in size First mode (at start) is the transitory mode, which disappears with more crushing. 2nd mode is the characteristic of the materials and stays.. That's why its called Persistent mode.

ratio of the initial size of a typical dimension to the final size of that dimension K K = Kick's constant, d1 (m) = the average initial size of pieces, d2 (m) = the average size of ground particles. d1/d2 = the size reduction ratio (RR) and is used to evaluate the relative performance of different types of equipment. 𝐸=𝐾𝐾𝑙𝑛 ...

•The term size reduction is applied to ways in which particles of solids are cut or broken into smaller pieces. •Size reduction is necessary if the starting material is too coarse,and the final product needs to be a fine powder. •Comminution, crushing, disintegration, dispersion, grinding and pulverization are the synonyms of size reduction.

2. Introduction • The size reduction of solids is an energy intensive and highly inefficient process • 5% of all electricity generated is used in size reduction • Based on energy required for the creation of new surfaces, the industrial scale processes is generally less than 1% efficient. 3. Introduction Raw materials often occur in sizes ...

Example-II: The absorptive power of charcoal and kaolin increases after size reduction due to increase in surface area. 2. Size reduction produces particles in narrow size range. Mixing of powders with narrow size range is easier. 3. Pharmaceutical suspensions require finer particle size. It reduces rate of sedimentation. 4.

Size reduction by crushing has a size lim itation for the final products. If we requir e further reduction, say below 5-20 mm, we have to use the processes of grinding.

The process is also called as comminution. Size Reduction Methods Compression Impact Attrition/rubbing Cutting/Shear. 1- Compression • Gripping + compressing between two surfaces • Work done by both surfaces • Feed: • Very coarse • Abrasive • Non-sticky • Product: relatively coarser • Example: Nut cracker.

Uses: • Fluid energy mill is used to reduce the particle size (10-325mesh) of most of the drugs such as antibiotics and vitamins. • Ultrafine grinding can be achieved moderately hard material can be processed for size reduction. Advantages: • Contamination is not possible.

2 SAMPLE PREPARATION, CRUSHING AND GRINDING 2.1 Introduction This section of the laboratory manual discusses aspects of sample preparation as well as operating details of individual crushing, grinding and classification equipment. The individual steps outlined are recommended for guidance purposes. A suggested time frame, where

SIZE REDUCTION BY CRUSHING METHODS Authors: A. Balasubramanian University of Mysore Abstract and Figures In the field …

the 1920 to 1950, consists of multiple stage crushing fol-lowed by rod and ball mills. To reduce operating cost by accepting coarser feed, the rod mills were replaced by larger-diameter ball mills during the 1960s. During the 1970s, autogenous grinding mills (AG) and semiautoge-nous grinding mills (SAG) were largely used, and soon the

where E is the energy per unit mass required for the production of a new surface by reduction, K is Rittinger's constant and is determined for a particular piece of equipment and material, x 1 is the average initial feed size, and x 2 is the average final product size. Rittinger's law has been found to hold better for fine grinding, where a …

p – Size reduction ratio • Coarse grinding has RRs below 8:1 • Fine grinding can exceed 100:1 • Grinding of coarse particles in which the increase in surface area per unit mass …

SIZE REDUCTION BY GRINDING METHODS Authors: A. Balasubramanian University of Mysore Abstract and Figures In the field …

For example, crushing, grinding, and milling take place in powdered sugar, flour, mustard, and cocoa production. Table 13.2 Types of forces used in size reduction equipments. Crushing: when an external force applied on a material excess of its strength, the material fails because of its rupture in many direction.

Particle size-reduction machines involve primary impact crushers and secondary crushers along with milling machines such as hammer mills, lump breakers …

fExercise 2. It is desired to crush 10 ton/h of iron ore hematite. The size of the feed is such that 80% passes a 3-in. (76.2 mm) screen and 80% of the product is pass to. 1/8-in (3.175-mm) screen. Calculate the gross power. required in English unit. Use a work index Wi for iron. hematite is 12.68.