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·20 Factors Influencing Choice of Size Reduction Equipment 2 Nature of Material • Hardness very hard materials are better in low speed or low contact machines • Structure fibrous materials need tearing or cutting action • Moisture content materials with 5 50% moisture do not flow easily and can be difficult to process • Stickiness sticky materials
·Particle size Free download as Powerpoint Presentation ppt / pptx PDF File pdf Text File txt or view presentation slides online Particle size separation involves separating a mixture of particles of various sizes into two or more portions based on differences in size Common methods of particle size separation include sieving
·This document discusses separation techniques used to separate materials It describes two main types of separation diffusional separation which separates homogeneous mixtures using processes like distillation or crystallization and mechanical separation which separates heterogeneous mixtures based on physical properties like size shape or density
·Other Types of Separation Equipment 6 7 Conclusion 7 Example Problems 8 9 Figure 1 Gas Capacity of Vertical Separators 10 In most cases the separator size used for a particular application is often a compromise between
·Mechanical separation equipment is used extensively in the food processing industry either in preparatory operations or in the main manufacturing and preservation operations and sensitive fruits where accuracy in size separation and caution in handling are needed Eggs can be sorted at the rate of 12 000/h They are first inspected
·Specific equipment for tasks like baling cubing hammer mills hydro pulpers suspended magnets and magnetic pulleys are outlined The objectives of processing include improving waste management system efficiency recovering materials and energy from waste streams Mechanical Volume & Size reduction b Component Separation Air
·6 Mechanism of filtration The mechanism whereby particles are retained by a filter is significant only in initial stages of filtration • Similar to sieving particles of larger size can t pass through smaller pore size of filter medium Straining • Solids having the momentum move along the path of streaming flow and strike impinge the filter medium
·It defines size separation and lists some common applications like quality control and determining particle size distribution It also outlines official standards for powder grades based on the sizes of screens particles can pass through To test efficiency of size reduction equipment or process 4 To optimize process condition such as
·This document discusses standards for particle size separation and powders It describes how powders are separated into different grades based on the size of sieve they pass through with finer powders passing through higher numbered sieves The five grades specified by the Indian Pharmacopoeia are defined by the sieve size they pass through
·Equipment Operation • Size reduction equipment performs satisfactorily when • Feed is of suitable size entering at uniform rate • Product is removed as soon as possible as the particles are of desired size Particle size separation Cyclone Others Sieves Classifiers views • 25 slides Industrial Pharmaceutical Size Reduction
·Episode 42 Gas Solid Separation The process may be interpreted to mean both degassing of solids and dedusting of the solids 3 phases may be distinguished in any gas cleaning process ; transport of particles onto a surface separation collection of separated particles from the separation surface into discharge hoppers or particle fixation disposal of
·3 SIZE SEPARATION Size separation is a unit operation that involves the separation of a mixture of various size particles into two or more portions by means of screening surfaces Size separation is also known as sieving sifting screening This technique is based on physical differences b/w the particles such as size shape and density
·Size exclusion chromatography Download as a PDF or view online for free • The separation of molecules is called fractionation • Size of pores in beads determines the exclusion limit what goes through the beads and what goes around the beads The solvent is not corrosive to any components of the equipment 21
·separation various separation processes can be classified into 1 Mechanical separations separations based on size and/or density differences of different components in a mixture for separation of solid from liquid filtration and centrifugation 2 Diffusional separations mass transfer operations separations based on molecular
· separation Mechanical separation equipment is used extensively in the food processing industry either in preparatory operations or in the main manufacturing and preser vation operations Mechanical processing operations such as size reduction size enlargement agglomeration homogenization and mixing treated in Chap 4 may
·• This separation process is used in industry and research for purifying and concentrating macromolecular 103 106 Da solutions especially protein solutions • Pore diameters in the 10 1000 A range Size of molecules 2 Shape of the molecule 3 Membrane material 4 Presence of other solutes 5 Membrane configuration 6 Fouling and
·1 SIZE REDUCTION Size reduction is the operation carried out for reducing the size of bigger particles into smaller one of desired shapes & size with the help of external forces Comminution is another term used for size reduction The row materiel is generally present in the large size which cannot be used by the industries so the materiel needs to be converted
·The technique of size separation is based on different physical properties of the substances in the mixture such as their size shape and density At starting crude drugs like Nuxvomica Rauwolfia Ephedra Ashoka and others are typically present in larger sizes But with the help of these techniques it becomes very easy to reduce and
A Coarse Powder A powder all the particles of which pass through a sieve with nominal mesh aperture of mm Sieve No 10 and not more than 40% pass through nominal mesh aperture of 355 µm Sieve No 44 is called a Coarse Moderately Coarse Powder A powder all the particles of which pass through a sieve with nominal mesh aperture of 710 µm Sieve No
·The important reasons for size reduction are easy handling increase in surface area per unit volume and separation of entrapped components Discover the world s research 25 million members
·It introduces membrane separation as using semi permeable membranes to separate components in a feed mixture For each technique it discusses the basic principles major components if applicable and common applications The techniques vary in their driving forces and size of molecules or particles that can be separated Read less
·9 Processes which depend primarily forces to accomplish the desired separation of components The Mechanism of Size Reduction In the grinding process materials are reduced in size by fracturing them In the process the material is stressed by the action of mechanical moving parts in the grinding machine and Initially the stress is absorbed internally
· Energy required to reduce the size of particles is directly proportional to the ratio of the initial size of a typical dimension to the final size of that dimension E = K k ln D f/D p E Energy required per mass of feed K k Kick s constant D f Average initial size of feed D p Average size of product
Place stack into a mechanical sieve shaker for 15 minutes Gyratory motion Gyratory motion with tapping Mechanical shaking Mechanical vibration A free PowerPoint PPT presentation displayed as an HTML5 slide show on id 21dba7 ZDc1Z
