In dry-process experiments with water-coal slurry, should the excess water in the coal be counted as part of the water amount used in slurry preparation?
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We are currently conducting experiments on water-coal slurry. The wording of the question might not be entirely clear; it essentially asks whether the external water present in the coal should be included in the amount of water added to prepare the slurry. For example, if a certain type of coal has a solid content of 93%, should the remaining 7% of water be taken into account as part of the water required to achieve the desired slurry concentration? For example, 15g of water needs to be added, but the coal already contains 3g of free water; therefore, the amount of water that needs to be added is 15–3=12g. Should the free water not be taken into account? When looking at the literature, some experiments are included while others are not. It’s not known how it is handled in industry. The coal I selected has a relatively high moisture content; if this factor is taken into account, the slurry formation quality will differ significantly. Thank you!
In industry, when calculating the amount of water required for a given mass of coal in order to achieve a certain slurry concentration (wt%), it is necessary to take into account the external water content of the raw coal. In practice, however, water is generally distributed based on operational experience, with calculations being used occasionally to estimate the approximate concentration. I hope it’s useful to you.
The external water in coal should be taken into account during the flood pulping process
Of course it has to be taken into account; otherwise, with lignite having such a high moisture content, the concentration calculated is 60%, but the value measured after drying is only 54%!