Research and Development of Superconducting Magnetic Separation System for Powdered Products

Mishima, Fumihito; Terada, Toru; Akiyama, Yoko; Izumi, Yoshinobu; Okazaki, H.; Nishijima, Shigehiro

doi:10.1109/tasc.2008.920830

Cited by 13 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a number of modern magnetic devices, for example, those intended for the separation of ferroparticles of the dispersed phase of technogenic and biological media or to control the behavior of these particles, i.e. implementation of the processes of magnetic separation (magnetophoresis), permanent magnets are used, mainly based on Nd-Fe-B [3][4][5][6][7][8][9][10]. In this case, the question of their positioning in the device for creating a working zone of magnetic influence on the medium, for example, with respect to the channel with the medium flow, is solved differently (Fig.…”

Section: Introductionmentioning

confidence: 99%

Induction of the Field at Different Distances from the Permanent Magnet and Between Opposing Magnets. Testing of the Superposition Principle

2019

IJITEE

View full text Add to dashboard Cite

The measurement data of the field induction at different distances from the permanent magnet Nd-Fe-B and between two equivalent magnets on distance are presented. It is shown that the obtained coordinate dependences are described by exponential function, but for a system of two magnets –only partially: up to the central area of the system and make 20-30% of the entire area between opposing magnets. Using the example of the coordinate dependence of induction for one of two identical magnets, it is shown that the use of the superposition principle makes it possible to obtain a coordinate dependence of induction between opposing magnets, which is equivalent to experimental one.

show abstract

Section: Introductionmentioning

confidence: 99%

Induction of the Field at Different Distances from the Permanent Magnet and Between Opposing Magnets. Testing of the Superposition Principle

2019

IJITEE

View full text Add to dashboard Cite

show abstract

“…Even though the removal of metal debris in the EMC powders is essential in the electronic packaging industry, the related issue was rarely reported in the literature. This situation is very unique comparing to other industries facing similar issues, such as those in making foods, drugs, general powders [4][5][6][7][8], and metal machining [9,10]. For the food, drug, and general powder industries, the causes of metal debris are similar to those of EMCs.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, for these industries, various methods have been applied to remove metal debris. These methods of removal are generally based on permanent magnets as the debris are usually ferromagnetic materials [4][5][6][7][8][9][10]. However, comparing to these industries, the uniqueness of lacking in the literature of metal debris removal in the EMC industry deserves special attention.…”

Section: Introductionmentioning

confidence: 99%

Removing metal debris from thermosetting EMC powders by Nd-Fe-B permanent magnets

2017

View full text Add to dashboard Cite

During the preparation of thermosetting encapsulation molding compounds (EMCs) for semiconductor packaging, metal debris are always present in the EMC powders due to the hard silica fillers in the compound. These metal debris in the EMC powders will cause circuit shortage and therefore have to be removed before molding. In this study, Nd-Fe-B permanent magnets are used to remove these debris. The results show that the metal debris can be removed effectively as the rate of accumulation of the metal debris increases as time proceeds in the removing operation. The removal effectiveness of the debris is affected by both the magnetic flux density and the flow around the magnet. The wake flow behind the magnet is a relatively low speed recirculation region which facilities the attraction of metal debris in the powders. Thus, the largest amount of the accumulated EMC powders occurs downstream of the magnet. Hence, this low speed recirculation region should be better utilized to enhance the removal efficiency of the metal debris.

show abstract

“…However, the design of magnetic separation system was based on the computation of only the magnetic field gradients, not considering the fluid flow [3], [5], [8]- [12]. On the other hand, the fluid flow was simulated based on the 2D fluid dynamics analysis with a simplified magnetic field analysis [6], [7].…”

Section: Introductionmentioning

confidence: 99%

Development of a Numerical Simulation Method for the Magnetic Separation of Magnetic Particles

Noguchi

Kim

2011

IEEE Trans. Magn.

View full text Add to dashboard Cite

Magnetic separation is a very useful tool in medicine manufacturing, sludge disposal and we have developed the magnetic chromatography system, which separates the magnetic particles or the ions from fluid due to its strong magnetic field gradients in the very small flow channel. There are many fine ferromagnetic wires on the wall of the developed magnetic column. A superconducting magnet applies a strong magnetic field to the magnetic column, and fine ferromagnetic wires make strong magnetic field gradients. It was, however, impossible to accurately evaluate the performance of the developed magnetic column due to the absence of a good simulation method. In order to enhance the accuracy of the simulation it is necessary to couple the fluid dynamics simulation with the magnetic field simulation. Therefore, we have developed a simulation code dealing with the fluid dynamics, solving Navier-Stokes, control volume, and magnetic field equations simultaneously, and compared the simulation result with the experimental one to verify the validity.

show abstract

Research and Development of Superconducting Magnetic Separation System for Powdered Products

Cited by 13 publications

References 6 publications

Induction of the Field at Different Distances from the Permanent Magnet and Between Opposing Magnets. Testing of the Superposition Principle

Induction of the Field at Different Distances from the Permanent Magnet and Between Opposing Magnets. Testing of the Superposition Principle

Removing metal debris from thermosetting EMC powders by Nd-Fe-B permanent magnets

Development of a Numerical Simulation Method for the Magnetic Separation of Magnetic Particles

Contact Info

Product

Resources

About