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.

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.

Magnetic Induction Effect of Amorphous Ribbon Modified by Rare-Earth

2010 ◽  
Vol 152-153 ◽  
pp. 587-591 ◽  
Author(s):  
Da Guo Jiang
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Amorphous Alloy ◽  
Magnetic Induction ◽  
Amorphous Ribbon ◽  
Induction Effect ◽  
Temperature Influence ◽  
Rare Earth La ◽  
The Magnetic Field ◽  
Rare Earth Content

Prepared rare-earth La modified amorphous ribbon by doping Rare-earth La in Fe78Si9B13 amorphous alloy. Investigated rare-earth content and temperature, as well as their influence on the magnetic induction effect and it’s amplitude. The results show that, when magnetic field is less than 1356 A / m, with the increase of Rare-earth content ,the magnetic induction effect first increased and then decreased, when the magnetic field strength greater than 1356 A / m, the Rare-earth content influence little on magnetic induction effect , changing amplitude of magnetic induction effect shows first increased and then decreased with increasing Rare-earth content; temperature influence little on the magnitude of magnetic induction effect.

Magnetorheological Fluid for Levitation Migration Technology

2010 ◽  
Vol 148-149 ◽  
pp. 826-831
Author(s):  
Xu Lin Hu ◽  
Yang Guang ◽  
Pan Chao Cui
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Circuit Design ◽  
Magnetic Fluid ◽  
Magnetic Force ◽  
Magnetic Circuit ◽  
Magnetorheological Fluid ◽  
Directional Migration ◽  
Dispersed Particles ◽  
The Magnetic Field

The dispersed particles of magnetic fluid form stable chain-like clusters under the magnetic field, and shows “the flowing is controllable and the shape is controllable” effect. Based on this characteristic, using migration magnetic acted on the magnetic fluid, the object directional migration can be realize, then the magnetic fluid form ribbon at the same time, has the similar fluctuation behavior. The magnetic fluid aerosol migration principle, the aerosol magnetic circuit design, the magnetic field strength and the magnetic force were separately discussed in this paper. The magnetic fluid hover height using the MSL micrometer dial has determined and aerosol migration feasibility has confirmed using the experiment.

scholarly journals EXPERIMENTAL STUDY OF COAGULATION OF PARTICLES IN A MAGNETIC SEDIMENTATION

2020 ◽  
Vol 15 (2) ◽  
pp. 102-106
Author(s):  
Evgeniy Masyutkin ◽  
Boris Avdeev
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Induction ◽  
Complex Function ◽  
Entire Area ◽  
Laboratory Setup ◽  
Working Volume ◽  
Coagulation Of Particles ◽  
Foreign Impurities ◽  
The Magnetic Field

In agriculture, a large number of different lubricating and cooling liquids are used in the operation, maintenance and repair of agricultural machinery. In the process of use, technical fluids become contaminated with foreign impurities and require periodic cleaning. Magnetic sedimentation tanks are well suited for this. The studies were carried out in order to determine the parameters (the magnitude and gradient of the magnetic field strength, the height of the apparatus, the concentration of particles), at which coagulation of particles is observed in a non-uniform magnetic settler. The experiments were carried out on a laboratory setup for studying coagulation in the working area of a magnetic sump. For a given magnetic system, the geometric dimensions of the apparatus were determined in such a way that the magnetic field acts in the entire working volume of the sump and effectively traps foreign metal impurities. The value of the magnetic induction of the field B is proportional to the square of the distance from the investigated point to the pole of the electromagnet Н0. At a distance of 300 mm and further, the magnetic force has almost no effect on the particle, so the height of the sump should be less. The lowest magnetic induction is observed in the middle of the coil. A decrease in the current in the winding entails a reduction in the length of the floccule; magnetic coagulation takes place when the concentration of particles in the coolant is more than 0.3 g/l, with a lower content, it is not observed due to significant distances between the particles; the effect of coagulation is noted in the entire area of action of the magnetic field, while the length of the floccules decreases with a decrease in concentration. The distance at which the effect of coagulation between particles is observed is determined by a complex function that depends on the current in the winding, the field strength, their distance from the pole of the electromagnet, and also on the size of the particles.

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.

Study on the Magnetic Induction Effect of Rare-Earth La Modified Amorphous Ribbons

2011 ◽  
Vol 415-417 ◽  
pp. 527-531
Author(s):  
Da Guo Jiang ◽  
Cao Bing Yang ◽  
Guo Tai Zheng
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Magnetic Induction ◽  
Annealing Temperature ◽  
Amorphous Ribbon ◽  
Induction Effect ◽  
Amorphous Ribbons ◽  
Rare Earth La ◽  
The Magnetic Field ◽  
Rare Earth Content

Prepared rare-earth La modified amorphous ribbon by doping Rare-earth La in Fe78Si9B13amorphous alloy. Investigated rare-earth content and annealing temperature as well as their influence on the magnetic induction effect and its amplitude. The results show that, when magnetic field is less than 1356 A/m, with the increase of Rare-earth content,the magnetic induction effect first increased and then decreased, when the magnetic field strength greater than 1356 A/m, the Rare-earth content influence little on magnetic induction effect, changing amplitude of magnetic induction effect shows first increased and then decreased with increasing Rare-earth content.

scholarly journals Study and Modeling of the Magnetic Field Distribution in the Fricker Hydrocyclone Cylindrical Part

Computation ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 42 ◽  
Author(s):  
Boris Avdeev ◽  
Roman Dema ◽  
Sergei Chernyi
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Field Distribution ◽  
Magnetic Force ◽  
Cylindrical Part ◽  
Magnetic Field Distribution ◽  
Radial Magnetic Field ◽  
Working Chamber ◽  
The Magnetic Field

The magnetic field distribution along the radius and height in the working chamber of a hydrocyclone with a radial magnetic field is studied. One of the most important parameters of magnetic hydrocyclones is the magnetic field distribution along the radius and height of the working chamber. It is necessary for calculating the coagulation forces and the magnetic force affecting the particle or flocculus. The magnetic field strength was calculated through magnetic induction, measured by a teslameter at equal intervals and at different values of the supply DC current. The obtained values for the magnetic field strength are presented in the form of graphs. The field distribution curves produced from the dependences found earlier were constructed. The correlation coefficients were calculated. It was proven that the analyzed dependences could be used in further calculations of coagulation forces and magnetic force, because theoretical and experimental data compared favourably with each other. The distribution along the radius and height in the cylindrical part of the magnetic hydrocyclone was consistent with data published in the scientific literature.

On the Configuration of the Magnetic Field of β CrB

1976 ◽  
Vol 32 ◽  
pp. 613-622
Author(s):  
I.A. Aslanov ◽  
Yu.S. Rustamov
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Radial Velocity ◽  
Magnetic Field Strength ◽  
Complex Shape ◽  
Rotation Period ◽  
Field Variation ◽  
Magnetic Field Variation ◽  
Secular Variations ◽  
The Magnetic Field

SummaryMeasurements of the radial velocities and magnetic field strength of β CrB were carried out. It is shown that there is a variability with the rotation period different for various elements. The curve of the magnetic field variation measured from lines of 5 different elements: FeI, CrI, CrII, TiII, ScII and CaI has a complex shape specific for each element. This may be due to the presence of magnetic spots on the stellar surface. A comparison with the radial velocity curves suggests the presence of a least 4 spots of Ti and Cr coinciding with magnetic spots. A change of the magnetic field with optical depth is shown. The curve of the Heffvariation with the rotation period is given. A possibility of secular variations of the magnetic field is shown.

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.

scholarly journals Effect of Magnetic Field on the Forced Convective Heat Transfer of Water–Ethylene Glycol-Based Fe3O4 and Fe3O4–MWCNT Nanofluids

2021 ◽  
Vol 11 (10) ◽  
pp. 4683
Author(s):  
Areum Lee ◽  
Chinnasamy Veerakumar ◽  
Honghyun Cho
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Field Strength ◽  
Ethylene Glycol ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Hybrid Nanofluid ◽  
Forced Convective Heat Transfer ◽  
The Magnetic Field

This paper discusses the forced convective heat transfer characteristics of water–ethylene glycol (EG)-based Fe3O4 nanofluid and Fe3O4–MWCNT hybrid nanofluid under the effect of a magnetic field. The results indicated that the convective heat transfer coefficient of magnetic nanofluids increased with an increase in the strength of the magnetic field. When the magnetic field strength was varied from 0 to 750 G, the maximum convective heat transfer coefficients were observed for the 0.2 wt% Fe3O4 and 0.1 wt% Fe3O4–MWNCT nanofluids, and the improvements were approximately 2.78% and 3.23%, respectively. The average pressure drops for 0.2 wt% Fe3O4 and 0.2 wt% Fe3O4–MWNCT nanofluids increased by about 4.73% and 5.23%, respectively. Owing to the extensive aggregation of nanoparticles by the external magnetic field, the heat transfer coefficient of the 0.1 wt% Fe3O4–MWNCT hybrid nanofluid was 5% higher than that of the 0.2 wt% Fe3O4 nanofluid. Therefore, the convective heat transfer can be enhanced by the dispersion stability of the nanoparticles and optimization of the magnetic field strength.

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