00000nam 2200000za 4500 9.841522 CaOODSP 20221107152116 cr ||||||||||| 170811s1972 oncd o f000 0 eng d CaOODSP eng eng fre n-cn--- M34-20/142E-PDF M34-20/142 Picard, Jacqueline L. Coal washery design - II [electronic resource] : the computation of recirculating loads / Jacqueline L. Picard, Metals Reduction and Energy Centre. Ottawa : Information Canada, 1972. iii, 25, 4 p. : charts Technical bulletin ; TB 142 Cover title. At head of title: Mines Branch program on environmental improvement. "December, 1971." Digitized edition from print [produced by Natural Resources Canada]. “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. Includes summary in French. gccst Coal gccst Processing Canada. Natural Resources Canada. Canada. Mines Branch. Technical bulletin (Canada. Dept. of Energy, Mines and Resources. Mines Branch) TB 142 (CaOODSP)9.834857 PDF 1.72 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M34-20/M34-20-142-eng.pdf 300027