Magnetic filter and magnetic substance removal method

Abstract

A magnetic filter (W1) provided with an outer cylinder (1) and inner cylinder (2) arranged concentrically, a filter chamber (12) formed in the gap between the outer cylinder (1) and the inner cylinder (2), and a magnet unit rod (3) accommodated in a removable manner inside the inner cylinder (2). A magnetic substance mixed in a filtrate flowing into the filter chamber (12) adsorbs to the outer peripheral surface of the inner cylinder (2) due to the magnetic force of the magnet unit rod (3) accommodated in the inner cylinder (2), a scraper (9) having scraping parts (9a) that come into contact with the outer peripheral surface of the inner cylinder (2) is placed in the filter chamber (12), and when the scraper (9) is operated, the scraping parts (9a) slide along the outer peripheral surface of the inner cylinder (2) and scrape off the magnetic substance adsorbed on the inner cylinder (2).

Description

technical field [0001] The present invention relates to a magnetic filter and a method for removing magnetic substances from the magnetic filter. For example, it relates to a magnetic filter and a method for removing magnetic substances in the magnetic filter, which are mixed with rolling oil provided for cold rolling in ironworks. The magnetic substance in the liquid is separated and purified from the liquid. Background technique [0002] Conventionally, a magnetic filter is used in a process of separating magnetic particles (magnetic substances) mixed in a liquid from the liquid. Here, regarding the magnetic filter of prior art, refer to Figure 5 , 6 and explain. [0003] It should be noted, Figure 5 It is a schematic diagram which shows the structure of the conventional magnetic filter, (a) is a schematic diagram which shows the longitudinal section of a magnetic filter, (b) is a schematic diagram which shows the cross section of a magnetic filter. and, Figure 6 It...

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Problems solved by technology

[0022] However, the above-mentioned conventional magnetic filter 100 has the following technical problem: in the backwashing process, in order to wash away the magnetic particles adsorbed on the outer peripheral side of the inner tube 2, it is necessary to make the flow rate higher than that in the filtering process. The backwash liquid flows into the "filter chamber 12", for this reason, the equipment becomes large-scale and the cost increases

For this reason, in the case of using the magnetic filter 100, it is necessary to install a large-scale facility for backwashing, resulting in an increase in the cost of the filtration treatment facility.

[0024] Moreover, the magnetic filter 100 has the following technical problem: since the magnetic particles not completely removed in backwashing remain on the outer peripheral side of the inner tube 2, the remaining magnetic particles gradually increase during repeated filtration and backwashing, Decreased filtration performance (removal performance of magnetic particles)

[0030] It should be noted that not only the method of periodically disassembling the magnetic filter 100 for maintenance is considered, but also the flow velocity of the filter chamber 12 of the backwash liquid is greater than "3.0-6.0m / s" and the viscosity is low. The thickness of the backwash is reduced to reduce the residual amount of magnetic particles after backwashing, but in this method, it will cause a further increase in the cost of backwashing equipment

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