settling and sedimentation 沉降
It is valuable for the removal of solids from liquid sewage wastes, getting crystals from what they precipitated from, settling solid food particles from a liquid food, and settling the slurry from a soybean leaching process.
Flotation is a mineral separation process, which takes place in a water-mineral slurry. The surfaces of selected minerals are made hydrophobic (water-repellent) by conditioning with selective reagents.
The hydrophobic particles become attached to air bubbles that are introduced into the pulp and are carried to a froth layer above the slurry thereby being separated from the hydrophilic (wetted) particles.
In addition to the reagents added, the flotation process depends on two main parameters.
Retention time needed for the separation process to occur determines the volume and number of flotation cells required.
Agitation and aeration needed for optimum flotation conditions, determine the type of flotation mechanism and the power input required.
centrifugal separation 離心分離
Centrifugal Separation is the most widely used method for separating fluids with different densities. It is also used in separating solids from liquids or solids from gasses. To-date , commercially available separators utilizing centrifugal force for separation fall in one of two categories, Rotary Centrifuges or Hydrocyclones
Filtration is a technique used either to remove impurities from an organic solution or to isolate an organic solid. The two types of filtration commonly used in organic chemistry laboratories are gravity filtration and vacuum or suction filtration.