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Filtration

Within the metalworking industry, filtration is normally the mechanical or physical process used for the separation of solids from fluids. This is carried out by using a medium through which only the fluid can pass leaving the remaining solid particles to be discarded. However if there happens to be oversize solids in the retained in the fluid then the separation is not complete.

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Filtration Applications

• The process used to separate fluid and particles in a suspension is filtration; this is where the fluid can be a liquid, a supercritical fluid or a gas. It is likely that either one or both of the components may be isolated depending on the purpose.
• For all metalworking machine shops the operation of filtration is very important for the separation of materials of different chemical composition. This aids the whole manufacturing process and allows everything to continue to run smoothly. It is possible to use a solvent which dissolves one element, while not dissolving other more important ones.
• The filtration methods and products offered by C & M Rogers include Gravity Media Filter, Vacuum/Pressure Media Filter & Filstar Separator.
• During filtration, a multilayer lattice is used to preserve the particles that are unable to follow the complex channels of the filter. It is possible for the oversize particles to form an obstructive barrier over the filter which can block the filter lattice and therefore prevent fluid from moving through the filter.
• Filtration differs slightly from the process know as adsorption. For the absorption process, it is not the size of particles which causes separation but instead it’s the effects of surface charge. There are adsorption devices available commercially which contain activated charcoal and ion exchange resin, these are know within the industry as filters, however filtration is not the function performed.
• Filtration also differs to some extent from elimination of magnetic contaminants from fluids with magnets. This process is typically used on lubrication oil, coolants and fuel oils due to there being no filter medium involved. Commercially devices are available which are called magnetic filters, the name reflects how they are used and not the way they operate.