Thus the figure 5 designates a dilution of 5 :1. Settling rate is expressed in terms of the depth in feet of clear liquid formed per hour or the rate in feet per hour at which the pulp surface moves downward.ĭilution is expressed in terms of the ratio by weight of liquid to solids, and is termed, for short, “The L:S Ratio.” In tables, charts and formulas, the first factor only of the L : S ratio is used. In order to avoid confusion, the nomenclature employed by Coe and Clevenger is used as far as possible in this paper. The details of these investigations are discussed at length below. Also many interesting new principles have been developed concerning the effect on settling phenomena of various changes in temperature and percentage of lime in solution. In subsequent investigations at El Tigre, improved methods have been devised for the laboratory determination of settling rates, and for the calculations of the required area and depth of settling tanks. This method of calculation was shown to give results which closely approximated those of actual settling, operations in the plant. The settling rate was that of the feed, as determined by laboratory tests. R1 and R2 were the moisture ratios respectively of feed and discharge. The formula, suggested at that time for solving problems of area, was likewise similar to that adopted by these gentlemen.Īrea = 0.0222 (Dry Tons) (R1-R2)/Settling Rate, in Feet Per Minute It is gratifying to note that these principles, tentatively announced 4 years ago as applying to Tigre ore, are now proved, by the comprehensive tests of Coe and Clevenger, to have universal application. The critical dilution, or the boundary between dilute and thick pulp, in the application of the above principles, is the highest dilution at which channels form in the pulp clear liquid reaching the surface through the channels.In settling thick pulp, settling rates are approximately proportional to pulp death.In settling dilute pulp, settling rates are independent of pulp depth.
in depth was suggested. Later experiments demonstrated that the following principles of settling applied to Tigre pulp. His tests proved that deep settling tanks were not ordinarily necessary.
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