JPS58219956A - Apparatus for separating magnetic powdery particle - Google Patents

Abstract

PURPOSE:To make it possible to separate magnetic powdery particles in good efficiecy and high removal efficiency, by a method wherein fine magnetic powdery particles are granulated by magnetism to be separated and removed. CONSTITUTION:A fluid having magnetic powdery particles suspended therein is supplied to a container 5 from the pipeline 3 of a granulator 1 and passed through the part of matrices 10 to be discharged to a pipeline 4. The magnetic powdery particles are adhered to the matrices 10 by high gradient magnetism due to an electromagnet 12 and other powdery particles are adhered to the adhered parts to carry out granulation. When granulation is carried out for a definite time and the particle size of the granulated substance reaches a proper particle size in the granulator 1, the supply of a current to the coil 12 is stopped while the supply of the fluid is carried out and a high frequency or an electrostriction current is supplied to a vibrator 11. By this operation, the matrices 10 are vibrated by a vibration plate 9 to release the granulated substance which is in turn sent to a separator 2 along with washing water from the pipeline 3 to be separated and removed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the method of granulating fine powder particles suspended in a fluid, such as fine magnetic powder particles suspended in a secondary system coolant of a nuclear reactor. The present invention relates to a magnetic powder separation device that can obtain a high removal rate by reducing the particle size to a certain level and then removing it.

When removing magnetic powder produced in a nuclear reactor secondary system coolant or the like using a separator, if the particle size of the product becomes 3 μm or less, removal becomes difficult and efficiency decreases significantly. In other words, if the separator is a cyclone separator or an alternating magnetic field type separator, the removal rate will decrease, and if the separator is a cyclone separator or an alternating magnetic field type separator, the filter mesh will be fine, which will cause clogging, increasing pressure loss and increasing the frequency of filter replacement. This leads to a decrease in efficiency.

An object of the present invention is to provide a magnetic powder separation device that is efficient and can obtain a high removal rate. and a separator for removing the granulated magnetic powder.

Embodiments of the present invention will be described below with reference to the drawings.

In Figure 1, 1 is a magnetic granulator that performs granulation using magnetism, and 2 is a separator such as a cyclone separator lid, a filter, or an alternating magnetic field type separator installed downstream of the granulator 1. .

A detailed example of the granulator 1 is explained with reference to FIG. 2.
A plurality of water holes 6 are provided on the bottom of the required container 5 to which 4 is connected.
A diaphragm 9 with a plurality of water holes 8 perforated on the upper surface is disposed inside the canister 7, and a diaphragm 9 with a plurality of water holes 8 perforated on the upper surface is disposed inside the canister 7. A matrix 10 is housed in between, and a vibrator 11 such as a magnetostrictive vibrator or an electrostrictive vibrator is attached to the upper surface of the diaphragm 9.
An electromagnetic coil 12 is arranged around the outer circumference of the container 5, and immediately on the container 5,
An electric wire penetration part 13 for high temperature and high voltage is attached to the cable insertion part that sends a high-frequency current to the vibrator 11.

1rlI The matrix 10 is made of porous amorphous metallic magnetic material in the form of thin wires, and is in the form of a thin tape, and is preferably arranged so that its longitudinal direction is parallel to the flow. may be an at random array.

Next, the operation of the present invention will be explained.

During granulation, a fluid in which magnetic powder particles are suspended is supplied from the pipe 3 to the container 5, passed through 10 parts of the matrix, and 1 part is discharged to the pipe 4. Discharge outside. The magnetic powder particles are attached to the matrix 10 by the high gradient magnetism generated by the electromagnetic coil 12, and granulation is performed by attaching other products to the attached portions.

When granulation is carried out for a certain period of time and the particle size of the magnetic powder becomes a particle size corresponding to the type of separator 2, the fluid is supplied from the conduit 3 while energization to the electromagnetic coil 12 is stopped, and the oscillator 11
By applying a high frequency or electrostrictive current of 10 to 1!5 KC to vibrate the matrix lO via the diaphragm 9,
The granulated deposits are separated from the matrix 10, and the detached deposits are sent to the separator 2 through the pipe 4 together with the washing water supplied from the pipe 3, where they are granulated and reduced in particle size. Separate the enlarged magnetic powder.

When the separator 2 is a cyclone separator or an alternating magnetic field type separator, the powder is granulated to a size of 3 microns or more, and when the separator 2 is a filter, the powder is granulated to a size of about 10 to 20 microns.

It goes without saying that an electromagnetic filter, a mille pore, etc. can also be used as the separator used in the present invention, and that various other changes can be made without departing from the gist of the present invention.

According to the apparatus for separating magnetic powder and granules of the present invention, (1) Granulation increases the weight of one grain of the product, which increases the effect of centrifugal force and the sedimentation rate of the product in water, thus increasing the removal rate. Efficiency improves approximately 4 times.

(When using a filter as a separator, the degree of clogging is reduced and the frequency of filter replacement is reduced, improving work efficiency. Also, less clogging reduces pressure loss, contributing to energy savings. .

0 If an alternating magnetic field separator is used as the separator, it can be made smaller.

0 The initial cost can be reduced because the entire device has a simple structure.

Various excellent effects can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a detailed explanatory diagram of the present invention, and FIG. 2 (t) is an explanatory diagram of a granulator used in the embodiment of FIG. 1. In the figure, 1 indicates a magnetic granulator, and 2 indicates a separator. Continued from page 10 Inventor: Kore Majima - Ishikawajima Harima Heavy Industries Co., Ltd. Yokohama No. 1 Factory, 1 Shin-Nakahara-cho, Isogo-ku, Yokohama Inventor: Hideyuki Tanaka Tohoku Metal Industry Co., Ltd., 6-7-1 Koriyama, Sendai City Within the Company ■Applicant Ishikawajima Harima Heavy Industries Co., Ltd. 2-2-1 Otemachi, Chiyoda-ku, Tokyo ■Applicant Tohoku Metal Industry Co., Ltd. 6-7-1 Koriyama, Sendai City

Claims (1)

[Claims] l) A device for separating magnetic powder and granules, which is equipped with a granulator that magnetically granulates magnetic powder and granules with a small particle size, and a separator that removes the granulated magnetic powder and granules. .