Liquid purification or separation – Magnetic
Patent
1998-10-06
2000-10-31
Walker, W. L.
Liquid purification or separation
Magnetic
209232, B01D 3506
Patent
active
061397369
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a device for magnetically agglomerating and treating impurities in liquids so as to magnetically agglomerate and treat the impurities such as magnetic suspensions and non-magnetic suspensions in the liquids, thereby to magnetically adsorb them on magnets, for example, relates to a device for removing from processing liquids, impurities of magnetic suspensions such as cuttings and metal powders, and non-magnetic suspensions such as carbon and soil matters, which are contained in oily or aqueous processing liquids used for electrical discharge machining by an electrical discharge machine or for cutting work or grinding work to cast articles by machine tools.
PRIOR ART
Hitherto, fine impurities such as suspensions (colloidal substances) contained in liquids have been removed by a filter using a filter paper or filter cloth or by a pre-coat filter coated with a filtration auxiliary. These fine impurities such as suspensions are, however, immediately adhered to the filter and accumulated thereon to increase a flow resistance of the filter, for which reason removal of the impurities by the filters are often made impossible within a short time.
Therefore, there were disadvantages that removal process of fine impurities such as suspensions by means of a filter or a pre-coat filter has to be discontinued to exchange the filter paper or filter cloth, or to pre-coat the filter with the filter auxiliary every times.
According to circumstances, fine impurities such as suspensions may be removed by using a screen or a strainer. In this case, however, clogging with the fine impurities appears soon to increase the flow resistance, thereby making removal process of the impurities impossible in a short time, for which reason it is necessary to discontinue the removal process of the fine impurities for cleaning the screen or strainer every time.
As mentioned above, in the conventional impurity removing process, in order to remove the fine impurities such as suspensions in the liquids, it is necessary to discontinue the removal process frequently, for which reason there are disadvantages in not only inefficiency of the process but also complicated, time-consuming and inconvenient operations such as exchange of the filter paper or cloth, pre-coating with the filtration auxiliary and cleaning the screen or punching metals. Particularly, upon disassembling the filter (apparatus), many problems are raised not only in long term discontinuation of the impurity removing process but also in increasing initial and ruing costs of the impurity removing system.
In addition to the above-mentioned filtration apparatuses, magnets such as ferrite have also been used to magnetically adsorb and remove fine impurities such as suspensions in liquids. Since, however, magnets such as ferrite are used, which have a magnetic force of 1200 to 4000 gausses. The impurities removed in liquids by such magnets would be only the magnetic suspensions such as iron or nickel, but non-magnetic suspensions such as carbon or oils are almost unremovable and retained in the treated liquids.
The residual non-magnetic suspensions such as carbon and oils in the treated liquids cause problems in pollution and corruption likely to generate malodor and off-flavor, thereby deterioration of the work environments.
If the liquids containing such non-magnetic suspensions are discharged to sewage or rivers without proper treatments, then problems with environmental pollution are caused, for which reason it is necessary to separately provide waste-liquid treating systems, thereby increasing plant and equipment investments.
For disposal as industrial waste in open-spaces near the factory, it is necessary to keep a vast disposal space due to a large amount of the waste. Relying upon disposal trader raises another problem with increase in the cost for disposal.
If a treating object is a used electrical discharge working liquid or a coolant liquid, then the magnetic suspensions and non-magnetic suspensions are included as impurities, f
Ocampo Marianne
Walker W. L.
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