Coal washery design - II : the computation of recirculating loads / Jacqueline L. Picard, Metals Reduction and Energy Centre. : M34-20/142E-PDF

“This bulletin, part II of a series, deals with the EMR process for the beneficiation of coal. Several considerations have contributed to its publication. Firstly, one of the elements of process design is, that two-stage operation with recirculation of intermediate products, properly applied, may enhance the separation efficiency and the financial returns of a processing plant. Secondly, the prevention of pollution at the source enforces effective control of water clarification and slimes removal. For these reasons alone, closed-circuit operation of processing plants deservedly receives more attention today than it has in the past. Effective control of slimes and recirculating middlings requires detailed information on the separating efficiency of the equipment units and involves the calculation of individual solids flowrates under steady-state conditions. The processing of this data poses a problem in that the volume of work, if done manually or on a calculator, requires too much time. Detailed instructions are given for calculating closed-circuit flow diagrams, using a small digital computer. Derivations of circuit equations are presented in an appendix. A "decision flowchart”, applicable to any combination of separators (to a maximum of five units), is presented for calculating the "recirculation coefficient" λ of individual size-fractions and gravity-fractions of the raw feed as it passes through the plant. Applications of the method of calculation are illustrated for a number of unit combinations encountered in coal washeries"--Summary, p. i.

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