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Download scientific diagram Reduction ratio R 80 as a function of the ratio between the upper size for the feed material F 90 and the crusher setting CSS; r 2 = from publication
·Size reduction is one of the most widely used unit operations in the chemical and allied industries Comminution is the process of exposing materials to stress through collisions and reducing the
·All crushers have a limited reduction ratio meaning that size reduction will take place in stages Operation stages The operating stages in minerals processing have remained the same for
·The secondary crusher has a size reduction ratio ranging from 3 1 to 5 1 The secondary crusher can be a cone crusher impact crusher or gyratory crusher depending on the hardness abrasiveness and size of the materials The cone crusher is the most common type of secondary crusher used in mining and quarrying operations
·p Size reduction ratio • Coarse grinding has RRs below 8 1 • Fine grinding can exceed 100 1 Jaw crusher • Feed is admitted between two jaws which are open at the top like V • One of the jaws is fixed and vertical while the other is the swinging jaw
·Limited reduction ratio lower capacity compared to gyratory crushers Cone Crusher Uses a rotating mantle within a concave bowl to compress and crush material Secondary and tertiary crushing stages offers better shape and size control 50 300 mm 6 100 mm Moderate to high Better shape and size control higher reduction ratio
·In closed circuit the product from the stage of size reduction is separated into relatively fine and coarse fractions The coarser fraction is then collected and re crushed in the same unit as seen in Figure doing so the load on the equipment for size reduction is increased and a circulating load is established but the total number of units required for
·The reduction ratio affects the final product size Higher reduction ratios mean that the material will be reduced more in size leading to finer end products Lower reduction ratios result in coarser products Achieving the right reduction ratio in the crusher is essential for controlling the product size The crusher s settings such as
LAPORAN RESMI PRAKTIKUM OPERASI TEKNIK KIMIA Materi Size Reduction Disusun Oleh Cokorda Satrya Pramana Group Rekan Kerja 3 Selasa Kenshi Budhi Saputra Riska Anggini Putri 21030118140192 21030118120012 LABORATORIUM OPERASI TEKNIK
·Rock crusher Material is reduced by crushers and grinders by fracturing which takes place when the material is put under stress by the moving parts of the crushing or grinding equipment Kick s Law states that the energy is proportional to the size reduction ratio The equation for Kick s Law can be written as E = K K f c log e L 1
·Size reduction is measured by a reduction ratio defined as Seive size through which 80% particles passes after crushing Seive size through which 80% particles passes before crushing can be Fed into the Roll Crusher The maximum size of the particle that can be fed into the roll crusher is determined by the radius of the roll R roll gap L
To determine the effect of effective reduction ratio the crusher capacity was measured by crushing below mm from a coal particle size of 50 90 mm with one stage reduction and three stage
·Jaw crushers are operated to produce a size reduction ratio between 4 1 and 9 1 Gyratory crushers can produce size reduction ratios over a somewhat larger range of 3 1 to 10 1 The primary operating variable available on a crusher is the set and on jaw and gyratory the open side set OSS is specified This reflects the fact that
·Many of them do not take care of mechanical losses in the crusher Most popular comminution laws are those proposed by Kick Rittinger and Bond Thus kicks law can be applied to coarse crushing where feed size is quite large and reduction ratio is quite low Rittinger s Law 1867 AD A more accurate law of comminution has been proposed
·JAW CRUSHER AIM To determine the size reduction ratio of particles by conducting an experiment in a jaw crusher THEORY Crushers are slow speed machines for coarse reduction of large quantities of solids The main types are jaw crushers gyratory crushers smooth roll crushers and toothed roll crushers
·This series of product size distributions can then be considered as arising from passage through a series of smaller crushers operating in parallel with differing reduction ratios From the top size fraction it is possible to determine the split S1 which actually by passes the crusher it is given by f1 x S1 = p1
·Three main factors are identified to promote the size reduction process occurring in a cone crusher viz breakage modes number of crushing zones and compression ratio
·The output size from a jaw crusher can typically be adjusted between 150mm to 300mm depending on the discharge settings They boast a reduction ratio ranging from 3 1 to 6 1 making them exceptionally capable of producing a considerably smaller size suitable for further processing or direct application in some cases
·High reduction ratio Good quality end products Nordberg® NP Series HSI crushers for primary range Horizontal Shaft Impact HSI crusher primary range has been designed to increase the crushing process productivity thanks to its high reduction ratio Usually utilized in the first crushing stage of the size reduction process in aggregates
·A crusher also known as a stone crusher is a machine that uses mechanical action to break large rocks ores or other raw materials into gravel or rock powder Hammer crushers have a reduction ratio of up to 50 a feed size of up to 1 000 mm and a maximum output capacity of 3 000 t/h They are energy efficient produce minimal over
Here the maximum reduction ratio is about 8 1 In some cases installation of a tertiary crusher is required where the maximum reduction is about 10 1 Since all the coarse crushers have greater capacities than the devices for the finer ranges of size reduction a gyratory crusher of sufficient size to crush the required size feed may have
