hydrophobic (floatable) material is separated and reported as FCP. This is combined, at the mixing point, with the DMC product to make the TPP.
Incremental ash equalisation concept and near gravity capture Incremental ash is a concept that relates to the ash value distribution of particles that comprise a TPP. Due to this distribution, although the product may have a given overall ash value (e.g. 10%), it actually comprises a mixture of particles with a wide range of ash values. It may contain individual particles that have a 5%, 6%, or 7% ash value mixed with particles that have higher ash values. In fact, it is conceivable that there is an individual particle with a 25% ash value in a shipment Figure 2. Coarse coal yield/ash washability curve. that is sold as having a 10% average ash value. In an analogous way, the ash value of particles in the CCP and FCP streams also have distributions. If the Table 4. TPP yield from combing coarse and fine circuit products separating condition of the DMC is changed by a small amount to increase the overall product ash value, then Processing a small (incremental) increase in yield would result in an Circuit Split (%) Yield (%) Ash (%) associated ash value (incremental ash). A similar effect occurs in relation to the operating condition of the FCP Coarse 75 44.9 10 stream. Fines 25 55 10 In this context, the incremental ash equalisation Total plant product 47.4 10 concept is that TPP yield will be maximised only when the incremental ash of the CCP and FCF streams are the same at the mixing point. To summarise, maximum yield in the CPP is comprising the final products are equalised. The corollary achieved when the incremental ash values of all streams is that yield is lost in the CPP when they are not.
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