Rock Grain Size.docx - 0 1 Rock Grain Size(Sieve Analysis 2...

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1 Rock Grain Size (Sieve Analysis) __________________________________________
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4 Contents 1.0 Objective of the Experiment ………………………….……………………………………. 2
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5 2.0 Principle of Operation ………………………………………………………………………… 2 3.0 Procedures ………………………………………………………………………………..……….. 3 4.0 Calculations and Results of the Experiments ……………………………….……….. 4 5.0 Discussion and Conclusion ……………………………..…………………………………… 5 6.0 Questions and Answers ………………………………………………………………………...5
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9 1.0. Objective The objective of this experiment is to use Tyler Screens method to measure distribution and surface area of rock grain size. 2.0. Principle of Operation There are many techniques that can be employed to characterize particles, some simple and primitive and some complicated and sophisticated. The most commonly used method for classifying powders is the sieve analyisis.
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10 A sieve analysis is a laboratory routine performed on a formation sand sample for the selection of the proper-sized gravel-pack sand. A sieve analysis consists of placing a formation sample at the top of a series of screens that have progressively smaller mesh sizes downwards in the sieve stack. After placing the sieve stack in a vibrating machine, the sand grains in the sample will fall through the screens until encountering a screen through which certain grain sizes cannot pass because the openings in the screen are too small. Sieving can be performed either wet or dry. In dry sieving (the most common technique), the sample is prepared by removing the fines (i.e., clays) and drying the sample
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11 in an oven. If necessary, the sample is ground with a mortar and pestle to ensure individual grains are sieved rather than conglomerated grains. The sample is then placed in the sieving apparatus that uses mechanical vibration to assist the particles in moving through and on to the various mesh screens. Wet sieving is used when the formation sample has extremely small grain sizes. In wet sieving, water is poured over the sample while sieving to ensure that the particles do not cling together. The mesh number of a sieve refers to the number of parallel wires per inch in the weave of the screen. The result of the sieve size analysis is commonly plotted in a
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12 logarithmic-scale graph expressing the cumulative weight percentage under size as the abscissa and the particle size as the ordinate. Sieve analysis does not provide the information for the largest and the smallest particle sizes. The size cut provides an approximate value for the mean particle size within the cut. Sieve analysis also does not differentiate the particle shape. A needle shaped particle can either pass through a mesh or be retained on the screen, depending on its orientation during sifting.
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