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  1. the process of recovering small particles of organic material by immersing sediment samples in water or other fluids and skimming off the particles which float on the surface. An important method for obtaining microfloral and microfaunal remains and carbon samples.
  2. Method by which hydrophobic (water-repelling) particles of an ore are separated from hydrophilic (water-attracting) particles of a metallurgical pretreatment process.

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