<%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%> How about Jaw Crusher Performance In Granite Quarry -- Mining machinery manufacturers Vipeak
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How about Jaw Crusher Performance In Granite Quarry
Sample Collection, Preparation And Testing
    The rock samples used for the investigation were obtained from different quarries in Nigeria. Dolomite, limestone and marble samples were collected from Edo State and granite rock samples from Ondo State, Nigeria. Five boulders of each rock type of dimension 90cm x 50cm x 50cm were representatively selected from recently blasted portion of the rocks which were free from natural defects, that is, discontinuities such as cracks, joints, fractures etc were packed properly to avoid damage during transportation. For the unconfined compressive strength test, the rock sample was cut into square shape with dimension of 60 mmx6O mm with masonry saw and Vernier caliper was used to measure the dimension. Also, for the point load test, the rock samples were broken into irregular shape with sledge hammer. Vernier caliper was used to measure the diameter and length of irregular shaped rock samples from the different locations. The mean value for length ad diameter was determined.
    The rock samples were prepared and tested in the laboratory to International Society for Rock Mechanics Standard for each strength test carried out using Masonry Saw Machine and Compression Testing Machine and Point Load Tester respectively"". The readings were taken and recorded. The size reduction of equal weighed of the rock samples was done using Laboratory Jaw Crusher and the particle size distribution was carried out in notional set of sieves using Sieve Shaker. The crushing times were taken and recorded and the weights of samples retained on the sieves recorded for size distribution. The rock sample were cut into square shape by using masonry cutting machine, the cut samples were smooth, free of abrupt irregularities and strength. Five specimen of each of the rock samples were tested and the failure load was recorded for each test as the failure was observed axially in the compressive testing machine.
     Some lumps of the different rock types were then crushed using the Laboratory Jaw Crusher and taken record of the crushing times. The screening of the crushed rock samples was carried out in a set of sieve using the Laboratory Sieve Shaker. The sieve was arranged in the order of decreasing aperture: 4700, 2000, 1700, 1180, 850, 600, 425, and 212 gm by placing the sieve that has the largest opening at the top and the least opening at the bottom. A tight fitting pan or receiver was placed below the bottom sieve to receive the finest grained which is referred to as undersize. The crushed sample was placed on the top sieve and a lid was used to cover it to prevent escape of the rock sample during the process. The set of the sieve was then placed in a sieve shaker which vibrates the sieve for proper screening. This operation was carried out on the rock sample for five minutes. This was achieved by using the automatic control timer of the sieve shaker. After the screening analysis, the retained sample on each sieve was measured on weigh balance and recorded responding sieve opening size.Source from:http://www.infostonecrusher.com/
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