D = dilution, or ratio of weight of liquid to weight of solid,.This figure is valuable in two ways-directly, because for each unit process and operation in milling the optimum pulp density must be established and maintained, and indirectly, because certain important tonnage calculations are based on pulp density. Pulp densities indicate by means of a tabulation the percentages of solids (or liquid-to-solid ratio) in a sample of pulp. Mineral Processing and Metallurgical Formulas Some of these are given here for convenient reference. With such information at hand performance is calculated by the use of formulas and tabulations. These formulas are here in the hope that they would prove of value to others in the ore dressing industry. The following formulas were developed during a long association not only with design and construction, but also with the operation of ore dressing plants.
From these samples the essential information is derived by means of analyses for metal content, particle size distribution, and content of water or other ingredient in the ore pulp. Material in process often cannot be weighed without a disturbance of continuity consequently, mill control must depend upon the sampling of material in flux. The control of a milling operation is a problem in imponderables: from the moment that the ore drops into the mill scoop the process becomes continuous, and continuity ceases only when the products finally come to rest at the concentrate bins and on the tailing dams. Interpretation of Comparative Metallurgical Calculations.Resistance of Various Materials to Crushing.Liquid-Solid Relationships Specific Gravity & Volume.Measure Tonnage by Water Ratio (Pulp Dilution).Calculation of Circulating Load in a Classifier.
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