·Size Reduction and Size Separation Syllabus Definition objectives of size reduction and size separation factors affecting size reduction laws governing energy and power requirements of mills including ball mill hammer mill fluid energy mill etc sieve analysis standards of sieves size separation equipment shaking and vibrating
·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
·9 Ratio of feed size to product size To get a fine powder in a mill it is required that a fairly small feed size should be used Hence it is necessary to carry out the size reduction process in several stages using different equipment preliminary crushing followed by coarse powder and then fine grinding 10
·Size separation Objectives • Size separation • Importance of size separation • Sieve • Grades of powders • Classification of size separation Size separation • Size separation is a unit operation that involves the separation of a mixture of various sizes of particles into two or more portions by means of screening surfaces • Its also known as sieving shifting classifying
·size seperation Download as a PDF or view online for free The equipment used for sieving is not expensive 12 CYCLONE SEPARATOR Principle In cyclone separator the centrifugal force is used to separate solids from fluids The separation depends not only on the particle size but also on density of particles Hence depending on the fluid
·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
·EQUIPMENT FOR SIZE SEPARATION In the former size separation is based on the presentation of particles to uniformly sized apertures in screen decks While in the latter fluid dynamic size separation takes advantage of the interaction between gravity and drag forces Some of the equipment discussed below are 1 SIEVE SHAKER 2
·4 OBJECTIVES OF SIZE REDUCTION Increase the surface area because in most reactions involving solid particles the rate of reactions is directly proportional to the area of contact with a second phase Break a material into very small particles in order to separate the valuable amongst the two constituents Achieve intimate mixing To dispose solid wastes easily
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