JPH01207110A - Method for removing magnetic substance deposited on media of high-gradient magnetic separator - Google Patents

Abstract

PURPOSE:To remove the magnetic substance deposited on the media used in a high-gradient magnetic separator and to remarkably reduce the cleaning cost by vibrating the media. CONSTITUTION:The media 3 used in the high-gradient magnetic separator 1 are vibrated by vibrators 10 and 10' to remove the magnetic substance deposited on the media 3. As a result, the period of time from backwashing to backwashing can be extended, the consumption of steam, hot water, etc., can be significantly reduced, the period of time between the overhaulings can be extended, and the cleaning cost is remarkably decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention is a method for capturing captured magnetic substances from the media of a high-gradient magnetic separation device used to capture magnetic substances contained in a filtrate that is circulated. Regarding how to remove.

<Prior Art> A high gradient magnetic separation device is a device that captures magnetic substances in a filtrate using magnetic force, and its structure will be explained with reference to FIG.

1 is a high gradient magnetic separation device, in which the filtrate enters through a filtrate inlet 2, passes through a media 3 provided in a cylinder 8, and exits through a filtrate outlet 4.The media 3 is shown in FIG. It is a circular net of about 10 meshes made of magnetic thin wire. The media 3 is magnetized by a magnetic field generated from an electromagnet 5 housed in a yoke 9, thereby generating a high gradient magnetic field. The magnetic material in the filtrate passing through the media 3 is captured by the magnetic force generated by this magnetic gradient and adheres to m* of the media 3.

Then, when the high gradient magnetic separator l is continuously operated,
The amount of magnetic material attached to the media 3 increases over time, and if left as is, the media 3 will become clogged, making it difficult for the filtrate to pass through. For this reason, the conventional high-gradient magnetic separation apparatus 1 is equipped with a backwashing process in which steam, hot water, etc. are sprayed onto the media 3 and the magnetic material adhering to the media 3 is discharged from the system. In the backwash process, the filtrate outlet 4 becomes the backwash water inlet 6, and the filtrate inlet 2 becomes the backwash water outlet lower.

<Problems to be Solved by the Invention> The conventional method for removing magnetic substances attached to media using the backwashing process described above has the problem that, when continuously operated with a high-gradient magnetic separation device for several months, the attached magnetic substances that could not be completely removed accumulate. Eventually, the media became clogged, causing the problem that the filtrate could not pass through.

For this reason, there was a problem in that the high gradient magnetic separation apparatus had to be disassembled and the media cleaned once every few months in order to eliminate clogging of the media.

An object of the present invention is to provide a media cleaning method that solves these problems.

<Means for Solving the Problems> The present invention removes magnetic substances attached to the media by vibrating the media used in a high gradient magnetic separation device.

<Example> An example of the method for removing magnetic material attached to media according to the present invention will be described with reference to FIG. 1.2.

10.10' is a vibrating device provided on the inlet side and the outlet side of the media 3, and this vibrating device 1O110'
Any device may be used as long as it gives a periodic displacement to the oscillator 10, and there are no restrictions on its driving method.For example, a magnet (not shown) is embedded in the vibrating device 10. By alternately excitation and demagnetization, the medium 3 can be repeatedly displaced in the vertical direction. Note that 11.11' is a plurality of holes provided in the vibrating device 10.10', which are passages through which filtrate and the like flow.

Next, the timing of driving the vibration devices 10 and 10' will be explained. The vibrating device 1O110'' is usually stopped while the high gradient magnetic separation device l captures the magnetic material in the filtrate, and after a pressure difference is generated before and after the high gradient magnetic separation bag Wl, or after filtration for a certain period of time. It is activated at the start of the backwashing process, which is carried out after the process, and is stopped when the backwashing process is completed.By doing this, steam, hot water, etc. are sprayed onto the media 3 while vibrating the media 3, and the magnetic material deposited on the media 3 is removed. can be discharged from the system.

Furthermore, specific examples will be described. FIG. 4 is a system diagram of a roll coolant when the present invention is implemented in a reversible cold rolling mill. The high gradient magnetic separator l takes in the coolant liquid from the dirty section 12 of the roll coolant tank and discharges it to the clean section 13 after filtration. The backwash water passes through the high gradient magnetic separator from the backwash water inlet 6 and is discharged to the backwash water outlet lower.

When we measured the iron concentration of the backwash water discharged from the backwash water outlet lower, we found that the iron concentration in the backwash water discharged from the backwash water lower was 1000 (
ppm) (The iron concentration of the coolant at this time is 30
G (ppm)), but when the vibration 2 device 10.1G' according to the present invention is added, it becomes 300G (ppm
) (The iron concentration of the coolant liquid at this time is 300 (pp
a+3) and showed approximately three times the iron concentration. That is, it can be seen that approximately three times as much iron content could be removed from the media 3 by adding the vibrator 10.10'.

In the figure, 14 is a reversible cold rolling mill, 15 is a roll coolant cooler, 16 is a cartridge filter, 17 is a roll coolant pump, 18 is a suction filter of the roll coolant pump, and 19 is a filtration pump.

<Effects of the Invention> According to the present invention, it is possible to extend the period for carrying out the backwashing process, significantly reduce the amount of steam and hot water used, and it is also possible to disassemble the high gradient magnetic separation device. The interval for cleaning the media can be extended, and cleaning costs can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the high gradient magnetic separation device used in the present invention, Fig. 2 is a roll coolant system diagram showing an embodiment of the present invention, and Fig. 3 is a conventional high gradient magnetic separation device. FIG. 4 is a cross-sectional view of the device and a plan view schematically showing the media. l... High gradient magnetic separation device, 2... Filtrate inlet, 3... Media, 4
...filtrate outlet, 5...electromagnet, 6...
・Backwash water inlet, 7...Backwash water outlet, 10.
10'... Vibration device. Patent applicant Kawasaki Steel Corporation Figure 1 11' Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A method for removing adhering magnetic substances from media in a high-gradient magnetic separator, the method comprising: vibrating the medium used in the high-gradient magnetic separator to remove magnetic substances adhering to the medium.