SIZE REDUCTION 2. require a small power input per unit of product 1. have a large capacity • An ideal crusher would: 3. yield a product of the single size distribution desired • cost of power is a major expense in size reduction equipment, so the factors that control this cost are important
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If someone wants a void ratio of 0.4, say for that top layer, then they are asking for a single sized material, possibly 3" clear rock. On the subject of void ratio, if you have one size spheres, the maximum void ratio you can get is 0.92 with them stacked one on top of the other, as loose as possible.
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Crushers : Smooth Roll Crushers The maximum size of the product is 2d. These operates most effectively when set to give a reduction ratio of 3 or 4 or 1. That is the max diameter of the particle is 1/3rd or 1/4th of that feed. The forces exerted by these rolls are very great from 8700 – 70000 N/cm.
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Calculation of reduction ratio in crushing [image: (135-5-3)] Crushing Equipment The selection of the right crushing equipment is influenced by many factors some of which are upstream of the crushing plant (e.g. blasting pattern and mining method) and others which are downstream of the crushing plant (e.g. mill and grinding circuit selection).
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Classification of crushers • it is not generally economical to effect a large reduction ratio in a single machine. • The equipment used is usually divided into classes as given below, according to the size of the feed and the product. • A greater size reduction ratio can be obtained in fine crushers than in coarse crushers 13.
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crushing. These factors include (1) stone type, (2) feed size and distribution, (3) moisture content, (4) throughput rate, (5) crusher type, (6) size reduction ratio, and (7) fines content. Insufficient data are available to present a matrix of rock crushing emission factors detailing the above classifications and variables.
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Follow the steps below to quickly reduce the size of a JPEG. First, you''ll need to locate the image you wish to resize. Right-click it once you have, and select Edit. This will open your image in Paint. Under the Home tab, click Resize. In the Resize and Skew dialog box, select the Maintain aspect ratio checkbox.
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Key Words: comminution, crushing principle, reduction ratio, type of crusher, Effective circuits of crushing 3. 1. INTRODUCTION This document is an investigation aimed at studying and optimizing the secondary and tertiary crushing circuit. Crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust.
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For primary crushing with a reduction ratio of 6 to 1. When a relatively coarse product is desired, top size usually larger than 38 mm (1 1/2") Closed Circuit Crushing System To control top size from a single crusher operating in an open circuit, material must remain in the crushing chamber until the material is reduced to top size.
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Gear Ratio • You can think of gear ratio as a multiplier on speedand a divider on torque. • You can calculate the gear ratio by using the number of teeth of the “driving gear" (a.k.a. the inputgear) divided by the number of teeth of the “driven gear” (a.k.a. the outputgear).
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Jaw crusher. Jaw crusher is used as primary crusher. It uses compressive force for breaking the material. This mechanical pressure is achieved by the two jaws of the crusher. Reduction ratio is usually 6:1. The jaw crusher is consisting of two vertical jaws installed to a V form, where the top of the jaws are further away from each other than
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Classification of crushers • it is not generally economical to effect a large reduction ratio in a single machine. • The equipment used is usually divided into classes as given below, according to the size of the feed and the product. • A greater size reduction ratio can be obtained in fine crushers than in coarse crushers 13.
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Ratio of feed size to product ratio: Machines that produce a fine may be necessary to carry out the size reduction process in several stages with different equipment, for example, preliminary crushing, followed by coarse grinding and then fine grinding.
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Gyratory crushers are the most efficient primary crushers for dealing with blasted hard rock in ore and natural stone mining. Due to different crushing chamber designs these machines can either prepare materials for downstream processing with a high crushing ratio, or reduce overburden to a size suitable for belt conveying with a low crushing
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Primary Crusher — The first crusher in a crushing system into which material is fed. Succeeding crushers in the system are referred to as secondary or tertiary crushers. Product — Output from the crusher. Reduction Ratio — The ratio of the top size of input material to the top size of crusher discharge.
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All crushers have a limited reduction ratio m eaning that size reduction will take place in stages. This kind of impact stone crusher is a kind of hig h-efficient strong coarse and mid crushing .
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It is usually employed for primary crushing with a reduction ratio of 6 to 1. Thus, based on the mechanical method of size reduction, crushers can be distinguished as Jaw crushers, cone crushers, gyratory crushers, and roll crushers all operate on the compression principle. Impact crushers utilize the impact principle, while hammermill crushers
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Setting jaw crushers. Ideally, the reduction ratio of a jaw crusher should be 6-to-1. There are different ways to calculate reduction ratio, but the best way is something called the P80 factor. The reduction ratio is then calculated by comparing the input feed size passing 80 percent versus the discharge size that passes 80 percent.
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Size of stone aggregate If the ratio of diameter of core to maximum size of stone aggregate is less than 3, a reduction in strength is reported. For concrete with 20mm size aggregate, 50mm dia core has been tested to give 10% lower results than with 10mm dia cores. Presence of transverse reinforcement steel
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The clay-stone mixtures were then compacted by standard Proctor method to determine maximum dry density, optimum moisture content, and void ratio of each mix. Additionally, permeability and unconfined compressive strength tests were conducted on mixtures compacted to a minimum of 95 percent maximum dry density and at ±2 percent optimum water content.
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Crushers are classified into three types based upon the stage of crushing they accomplish. These are (i) primary crusher, (ii) secondary crusher, and (iii) tertiary crusher. The primary crusher receives material directly from run of mine (ROM) after blasting and produces the first reduction in size.
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the opening size of the wirecloth. Steeper slopes have lower factors since the rock has a tendency to bounce off the end before being sorted. The rounder the rock, and the greater the ratio of rock size to opening, the faster the rock moves from the feed end of the screen to the discharge end. The faster the rock is moving the less likely it is to
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72. The crushing strength of a good building stone should be at least (a) 50 MPa (b) 100 MPa (c) 150 MPa (d) 200 MPa 73. The slenderness ratio for masonry walls should NOT be more than (a) 50 (b) 40 (c) 30 (d) 20 74. The most important purpose of frog in a brick is to (a) Emboss manufacture’s name (b) Reduce the weight of brick
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Crushers : Smooth Roll Crushers The maximum size of the product is 2d. These operates most effectively when set to give a reduction ratio of 3 or 4 or 1. That is the max diameter of the particle is 1/3rd or 1/4th of that feed. The forces exerted by these rolls are very great from 8700 – 70000 N/cm.
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R: Size reduction ratio The ratio of the gape width to the near side jaw opening. This ratio may vary from 1/3 to 1/9, but is generally 1/3 for primary crushers and 1/4 for secondary crushers.
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2) medium gravel- 8 to 16 mm. 3) coarse gravel -16 to 64 mm. 4) pebbles -4 to 64 mm. 5) cobbles -64 to 256 mm. 6) boulder – more than 256 mm. Size of aggregate used in construction. Size of aggregate used in construction:- it all depend on structure, whether it is plain cement concrete or reinforced cement concrete.
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crushing. These factors include (1) stone type, (2) feed size and distribution, (3) moisture content, (4) throughput rate, (5) crusher type, (6) size reduction ratio, and (7) fines content. Insufficient data are available to present a matrix of rock crushing emission factors detailing the above classifications and variables.
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CRUSHED STONE BY IRA 0. BAKER, PROFESSOR OF CIVIL ENGINEERING INTRODUCTION Crushed stone has become an important material of construc-tion in modern engineering work. The chief causes for this are the great increase in the use of plain and reinforced concrete,
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Explosive efficiency is the ratio of the amount of energy released to the calculated thermochemical energy. Emulsions are highly efficient explosives, due primarily to their microscopic particle size. In contrast, explosives with varying particle size, such as ANFO or water gels, will not have a uniform burning rate, and therefore, will
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If someone wants a void ratio of 0.4, say for that top layer, then they are asking for a single sized material, possibly 3" clear rock. On the subject of void ratio, if you have one size spheres, the maximum void ratio you can get is 0.92 with them stacked one on top of the other, as loose as possible.
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