Here is the formula for specific gravity of a slurry, S is:

S = specific gravity of slurry
Si= specific gravity of liquid phase
Ss= specific gravity of solids phase
Cw = concentration of solids by weight
Cv= concentration of solids by volume
EXAMPLE: if the liquid has a specific gravity of 1.2 and the concentration of solids by weight is 35% with
the solids having a specific gravity of 2.2, then:

You will also find this Nomograph useful.

1 MINERAL PROCESSING FORMULAS

• 1.1 Pulp Densities
• 1.2 Calculation of Circulating Load in a Classifier
• 1.3 Calculation of Classifier Efficiency
• 1.4 Screen Efficiency
• 1.5 Measure Tonnage by Water Ratio (Pulp Dilution)
• 1.6 Pulp Density Tables
• 1.7 Concentration and Recovery Formulas
  • 1.7.1 Two-Product Formulas
  • 1.7.2 Three-Product Formulas
• 1.8 Reagent Consumption Calculations
• 1.9 Liquid-Solid Relationships Specific Gravity & Volume
• 1.10 Ratio of Concentration by Assay
• 1.11 Mill Water to Ore Ratio Requirements
• 1.12 Resistance of Various Materials to Crushing
• 1.13 Pulp Calculations
  • 1.13.1 Pulp Details by Weight
    • 1.13.1.1 Flotation
    • 1.13.1.2 Conditioning or Dissolving
  • 1.13.2 Pulp Thickening
  • 1.13.3 Simple Classification
  • 1.13.4 Compound Classification
• 1.14 Reagent Consumption
• 1.15 Interpretation of Comparative Metallurgical Calculations
• 1.16 Calculate Economic Metal Recovery

W/S Ratio.—The mixture of ore and water in which the process of concentrating the valuable minerals is performed is always termed a PULP. Its constitution can be expressed by stating that it contains a certain percentage of solid particles or “ solids ”, but just as common a method of describing the proportion of water to ore is by expressing it as a Water/Solids or W/S ratio, the amount of solids always being taken as unity. Thus a pulp containing 25% of solids has a W/S ratio of 3/1.