Principles of mineral processing by Maurice C. Fuerstenau, Kenneth N. Han

By Maurice C. Fuerstenau, Kenneth N. Han

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These losses should not exceed 1%. Significant weight gain is an indication of weighing errors or the inclusion of material remaining from previous tests. In any case, such data should be discarded and the test repeated. Observed small weight losses can be handled by expressing the individual weights as fractions of either (1) the actual final weight or (2) the initial (sample) weight. The first approach, in effect, distributes the errors proportionately among all sizes. On the other hand, the use of the initial weight, with the discrepancy assigned to the “pan,” meaning to sizes finer than the finest sieve used, involves the implicit assumption that all losses are caused by fines adhering to surfaces or becoming airborne.

5), and so-called micromesh sieves can be obtained with apertures as small as 5 µm. S. Standard sieve series are most commonly used for size analysis. Both of these use a geometric progression of sieve apertures with a constant ratio of 21/4 between adjacent members. It is common practice to omit the intermediate sieves, leaving a 21/2 ratio. S. S. 5). Size analysis by sieving is normally carried out by using a stack of standard sieves with opening sizes that decrease progressively from top to bottom.

Samples are withdrawn from the stream through a probe located as shown. The rate of withdrawal is adjusted, by using a pump, so as to ensure that the inlet velocity is the same as the flow velocity in the main stream. Measurement of Particle Size The size distribution of a particulate material is a description of the relative abundance of the different sizes present. Previously in this chapter we pointed out that, for the kinds of irregular particles typically encountered in mineral processing systems, particle “size” cannot be uniquely defined.

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