scholarly journals Analysis of Magnetic and Hydraulic Forces in an Oriented Real Matrix of a High Gradient Magnetic Separator

1985 ◽  
Vol 1 (4) ◽  
pp. 173-182 ◽  
Author(s):  
V. Hencl ◽  
K. Jahoda ◽  
E. Madai
Keyword(s):  
Magnetic Field ◽  
Magnetic Force ◽  
Theoretical Models ◽  
Attractive Force ◽  
Suspension Flow ◽  
Real Matrix ◽  
Magnetic Separator ◽  
High Gradient ◽  
Gradient Separation ◽  
The Magnetic Field

The application of existing theoretical models for the computation of magnetic and hydraulic forces in a real oriented matrix consisting of regularly arranged rods and wires indicates that these models produce no exact results. The differences between computations and measurements of force effects documented by Maxwell lead to the conclusion that it is necessary to start with different physical assumptions when modelling a high–gradient separation process. First of all, the magnetic field of the rods or wires system differs from the magnetic field of a single rod. Second, the particle need not be attracted to the rod surface, it is brought there by the suspension stream and the magnetic force must hold it, so that it is not entrained by the streaming suspension. As the layer of attracted particles grows, the magnetic attractive force on the surface of the growing layer decreases until the magnetic attractive force is in equilibrium with the entraining force of suspension flow.

Development and Application of Multi-Modular Roll Magnetic Separator

2012 ◽  
Vol 472-475 ◽  
pp. 912-916
Author(s):  
Ding Guo Huang ◽  
Song Liu ◽  
Hong Guang Jiao ◽  
Fei Yue Wang
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Permanent Magnet ◽  
Magnetic Force ◽  
Economic Benefits ◽  
Magnet System ◽  
Magnetic Separator ◽  
Perfect Performance ◽  
One Machine ◽  
The Magnetic Field

This new dry magnetic separator has a special structure. It has many magnetic roll which are staggered like a stairsteps. It can finish the task of separating different minerals with only this one machine. And also it can make the different magnetic material which are in the same mineral separate at the same time. The permanent magnet system is made of large fan-shaped magnet. The magnet pole N and S are staggered and has perfect performance of magnetic separation. And the magnetic force is made full use by going-up dynamic separation. And also it gives an analysis of stress in the magnetic field. It also shows that its separation idex is better, the economic benefits are obvious, and it has broader prospects of popularization and application.

Computer Simulation Study of Silver Deposition from its Aqueous Solution in High Gradient Magnetic Field

Fractals ◽  
1998 ◽  
Vol 06 (02) ◽  
pp. 145-150 ◽  
Author(s):  
Wenyong Duan ◽  
Hiroshi Yano ◽  
Yoshifumi Tanimoto
Keyword(s):  
Magnetic Field ◽  
Magnetic Force ◽  
Magnetic Field Effect ◽  
Gradient Magnetic Field ◽  
Deposition Pattern ◽  
Silver Deposition ◽  
Computer Simulation Study ◽  
High Gradient ◽  
Biased Random Walk ◽  
The Magnetic Field

The magnetic field effect on the silver deposition pattern generated from Ag +/ Cu redox reaction is simulated with the aid of a biased random walk model. In the model. In the model, one particle that represents an Ag + ion is generated at the same time, and it walks randomly under the influence of a magnetic force. Comparing the simulated pattern with the experimental one, it is confirmed that the convection induced by the magnetic force contributes chiefly to the silver deposition pattern in a high gradient magnetic field.

scholarly journals The Applicability of Davis Tube Tests to Ore Separation by Drum Magnetic Separators

2003 ◽  
Vol 12 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Vasile Murariu ◽  
Jan Svoboda
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Field Strength ◽  
Magnetic Induction ◽  
Magnetic Force ◽  
Current Practice ◽  
Magnetic Separator ◽  
Operating Field ◽  
Correct Information ◽  
The Magnetic Field

The current practice of assessing the efficiency of recovery of magnetite and ferrosilicon by drum magnetic separators is to conduct Davis tube tests at a magnetic induction equal to that on the surface of the drum. It is, however, the magnetic force or the force index, and not the magnetic field strength, that are decisive in the operation of a magneticseparator. Since the magneticfield gradients generated by Davis tube and drum magnetic separators are generally different, it is unlikely that the above practice would yield correct information. This article analyses the patterns of the force index generated by drum magnetic separators and a Davis tube operated at different field strengths. It is shown that in order to obtain a correct assessment of the efficiency of separation by a ferrite drum magnetic separator, a Davis tube should be operated at the field of about 0.1 T, which is lower than the current practice suggests. For a rare-earth drum separator the Davis tube operating field should be at least 0.3 T.

Study of MFM Application in Semiconductor Failure Analysis

2004 ◽  
Author(s):  
Way-Jam Chen ◽  
Lily Shiau ◽  
Ming-Ching Huang ◽  
Chia-Hsing Chao
Keyword(s):  
Magnetic Field ◽  
Failure Analysis ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Current Flow ◽  
Force Microscopy ◽  
The Magnetic Field ◽  
A Current

Abstract In this study we have investigated the magnetic field associated with a current flowing in a circuit using Magnetic Force Microscopy (MFM). The technique is able to identify the magnetic field associated with a current flow and has potential for failure analysis.

Fragmentation of a Filamentary Cloud Threaded by Perpendicular Magnetic Field

2018 ◽  
Vol 14 (A30) ◽  
pp. 105-105
Author(s):  
Tomoyuki Hanawa ◽  
Takahiro Kudoh ◽  
Kohji Tomisaka
Keyword(s):  
Magnetic Field ◽  
Magnetic Force ◽  
Outer Boundary ◽  
Radial Distance ◽  
Radial Density ◽  
Radial Density Distribution ◽  
Model Cloud ◽  
Moderate Magnetic Field ◽  
Self Gravity ◽  
The Magnetic Field

AbstractFilamentary molecular clouds are thought to fragment to form clumps and cores. However, the fragmentation may be suppressed by magnetic force if the magnetic fields run perpendicularly to the cloud axis. We evaluate the effect using a simple model. Our model cloud is assumed to have a Plummer like radial density distribution, $\rho = {\rho _{\rm{c}}}{\left[ {1 + {r^2}/(2p{H^2})} \right]^{2p}}$ , where r and H denote the radial distance from the cloud axis and the scale length, respectively. The symbols, ρc and p denote the density on the axis and radial density index, respectively. The initial magnetic field is assumed to be uniform and perpendicular to the cloud axis. The model cloud is assumed to be supported against the self gravity by gas pressure and turbulence. We have obtained the growth rate of the fragmentation instability as a function of the wavelength, according to the method of Hanawa, Kudoh & Tomisaka (2017). The instability depends crucially on the outer boundary. If the displacement vanishes in regions very far from the cloud axis, cloud fragmentation is suppressed by a moderate magnetic field. If the displacement is constant along the magnetic field in regions very far from the cloud, the cloud is unstable even when the magnetic field is infinitely strong. The wavelength of the most unstable mode is longer for smaller index, p.

scholarly journals The diffusion and mobility of ions in a magnetic field

1912 ◽  
Vol 86 (590) ◽  
pp. 571-577 ◽  
Keyword(s):  
Magnetic Field ◽  
Free Path ◽  
Magnetic Force ◽  
Mean Free Path ◽  
Electric Force ◽  
Mobility Of Ions ◽  
The Mean ◽  
The Magnetic Field

1. When the motion of ions in a gas takes place in a magnetic field the rates of diffusion and the velocities due to an electric force may be determined by methods similar to those given in a previous paper. The effect of the magnetic field may be determined by considering the motion of each ion between collisions with molecules. The magnetic force causes the ions to be deflected in their free paths, and when no electric force is acting the paths are spirals, the axes being along the direction of the magnetic force. If H be the intensity of the magnetic field, e the charge, and m the mass of an ion, then the radius r of the spiral is mv /He, v being the velocity in the direction perpendicular to H. The distance that the ion travels in the interval between two collisions in a direction normal to the magnetic force is a chord of the circle of radius r . The average lengths of these chords may be reduced to any fraction of the projection of the mean free path in the direction of the magnetic force, so that the rate of diffusion of ions in the directions perpendicular to the magnetic force is less than the rate of diffusion in the direction of the force.

Magnetic force on a magnetic particle within a high gradient magnetic separator

2013 ◽  
Vol 484 ◽  
pp. 333-337 ◽  
Author(s):  
S.K. Baik ◽  
D.W. Ha ◽  
J.M. Kwon ◽  
Y.J. Lee ◽  
R.K. Ko
Keyword(s):  
Magnetic Force ◽  
Magnetic Particle ◽  
Magnetic Separator ◽  
High Gradient

Construction of a Cost Effective Current Balance for Physics Teaching

2013 ◽  
Vol 770 ◽  
pp. 374-377
Author(s):  
Apichart Sankote ◽  
Kheamrutai Thamaphat ◽  
Supanee Limsuwan
Keyword(s):  
Magnetic Field ◽  
Uniform Magnetic Field ◽  
Magnetic Force ◽  
Magnetic Field Direction ◽  
Horizontal Segment ◽  
Applied Current ◽  
Copper Sheet ◽  
Physics Teaching ◽  
The Magnetic Field ◽  
A Current

In this work, a method to measuring the magnitude of a uniform magnetic field in space using current balance was described. A simple experimental set was designed and constructed using low-cost materials. This constructed current balance consists of copper sheet, weight pan, and acrylic sheet. A copper sheet was cut into a U-shape and attached at the end of acrylic balance arm. A weight pan was hanged in the opposite side of the balance arm with high sensitivity to a small torque. The horizontal segment of the U-shaped copper sheet, which the length l was 3 cm, was located inside the influence of an uniform magnetic field produced by two parallel bar magnets with opposite poles facing each other. The magnetic field direction was perpendicular to the horizontal segment. When a current was supplied to the copper sheet, the magnetic force acting on a horizontal segment of length l carrying a current I in a magnetic field B was given by. In the experiment, the current was varied from 0 1 A. For each value of applied current, the magnetic force on a thin straight sheet of length l was measured by adding masses to the pan until the balance arm moved to the equilibrium between opposing gravitational and magnetic forces. The results showed that the magnetic force increased linearly with increasing applied current. By plotting a linear graph of magnetic force versus applied current, the magnetic field B can be calculated from . The calculated and actual values of B were 100.32 and 100.13 mT, respectively. This constructed current balance is an excellent tool for high school and undergraduate fundamental physics courses. Students will be excited when they see the balance arm rising or going down due to magnitude and direction of current flowing in a conductor wire.

scholarly journals Magnetic Field Effect in the Process of Rinsing a Magnetic Separator Matrix

1988 ◽  
Vol 2 (3) ◽  
pp. 119-136
Author(s):  
Jiri Galas
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Circuit Design ◽  
Field Effect ◽  
Magnetic Circuit ◽  
Magnetic Field Effect ◽  
Magnetic Separator ◽  
High Gradient ◽  
First Time

This paper surveys fundamental aspects of the problem of rinsing matrices in high gradient magnetic separators. This is done, for the first time, in terms of the magnetic circuit design. Equations have been constructed to describe the effects of spurious remanent magnetic fields on the rinsing process.

Structural and Magnetic Properties of Sintered Materials on the Basis of Zinc Oxide

2013 ◽  
Vol 200 ◽  
pp. 261-266
Author(s):  
Igor Virt ◽  
Igor Rudyi ◽  
Ivan Kurilo ◽  
Ivan Lopatynskyi ◽  
Marian Frugynskyi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnetic Properties ◽  
Theoretical Models ◽  
Structural And Magnetic Properties ◽  
Faraday Method ◽  
The Magnetic Field ◽  
Sintered Materials ◽  
Scanning Electron

Structural and magnetic properties of ceramics Zn1-xCoxO and Zn1-xCrxO are studied. Average sizes of grains are determined by scanning electron microscopy. The magnetic field dependences of magnetic susceptibility are investigated by Faraday method. The relevant theoretical models are chosen.

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