Disperse ferromagnet in the magnetovibrating layer

Vernigorov, Yuri M.; Egorov, Ivan N.; Егорова, С. И.

doi:10.1016/j.jmmm.2004.11.378

Cited by 6 publications

(7 citation statements)

References 1 publication

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“…When a ferromagnetic powder is affected by a variable magnetic field with certain parameters, a MVL is formed [3,10]. The motion of particles in the state of a developed MVL is complicatedly dependent on the properties of the ferromagnetic material, the field topology, and is determined by the combined action of a large number of heterogeneous physical factors, which hampers the selection of field parameters that ensure the establishment of optimal application modes.…”

Section: Efficiency Of Grinding Particles In a Magneto Vibrating Layermentioning

confidence: 99%

“…Consider a polydisperse medium of a ferromagnetic material. Suppose that particles of a medium are spheres with frozen-in magnetic moments placed in an external variable magnetic field whose topology is such that its energy is transferred to particles of a disperse medium mainly to the translational degrees of freedom [3].…”

Section: Efficiency Of Grinding Particles In a Magneto Vibrating Layermentioning

confidence: 99%

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Network high-performance grinding devices for ferromagnetic materials

et al. 2019

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The design features of the grinding devices that implement the impact destruction of the ferromagnetic materials particles in a magneto vibrating layer formed in a non-uniform magnetic field are considered. It is shown that when a magnetizable powder is affected by an alternating magnetic field with certain parameters, a magneto vibrating layer is formed, under the conditions of which, a random perturbing factor occurs. It is caused by the dipole particles clusters interactions and provides highefficient finish powder grinding. Methods for producing metal powders, which are distinguished according to the operating principle and to the requirements for the technological properties of the powders obtained, are analyzed. For coarse grinding, jaw, roller and cone crushers and mullers are used; at this, particles of 1-10 mm in size, which are the source material for fine grinding, are obtained. The finish grinding of the material obtained is carried out on the ball rotating, vibrating or planar centrifugal, vortex and hammer mills. The main drawback of these techniques of metal powder grinding is sticking of grinding body residue on the powder particles, which reduces the quality and operational properties of the powder. A relation to calculate the dependence of the fineness number of ferromagnetic materials on the induction gradient of an external variable magnetic field is proposed. The design features of an electromagnetic mill based on a screw drum that, due to the spatial orientation of its walls, ensures an effective movement of powder flows inside it, such as mixing, rotation, oncoming movement, translational motion and simultaneous advancement through the drum are presented. The concept and technological options of grinding powders in an electromagnetic mobile hammer mill are revealed, which enables to obtain a powder of a given particle size distribution with high uniformity. It is established that mills in which a magneto vibrating layer is implemented are more effective than mechanical ones: grinding of ferromagnetic powders in a magneto vibrating layer increases drastically the performance of the grinding process. Changing the parameters of the electromagnetic field, you can set an average particle size and the degree of homogeneity of the powder.

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Section: Efficiency Of Grinding Particles In a Magneto Vibrating Layermentioning

confidence: 99%

Section: Efficiency Of Grinding Particles In a Magneto Vibrating Layermentioning

confidence: 99%

Network high-performance grinding devices for ferromagnetic materials

et al. 2019

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“…The experimental approbation of the offered technological scheme of slime separation was carried out on an iron ore concentrate of a class of 63 microns with the content of silicon dioxide of 4.57% of masses [15]. Results of a research on the impact of direct field induction, gradient of an alternative field induction and the time of separation for needed for a process of separation of magnetic and non-magnetic components of grinding slimes of steel SH-15 of GPZ-10 plant are presented at fig.4.…”

Section: Technology Of Magneto-vibrating Separation Of Grinding Slimementioning

confidence: 99%

Selection of Non-Magnetic Fraction from the Slime Wastes of Metal Production in the Electromagnetic Field

2019

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It is proved that the use of a variable inhomogeneous magnetic field, created by the superposition of constant and variable, strongly inhomogeneous fields, is considered to be very promising for the separation of non-magnetic fraction from powders of magnetic materials. This article introduces the effective technology of separation of non-magnetic fraction from the sludge wastes of metal production in the electromagnetic field, which allows to destroy the aggregates, to separate the abrasive and to get products of high purity. A complex on processing of grinding sludge includes the following blocks: the loading block with dispenser; block of preliminary squeezing and washing of DRC; the block of drying; the block of a refinement; the block of division of sludge fractions. Experimental approbation of the proposed technological scheme of sludge separation, which had been carried out on iron ore concentrate of class 63 microns with silica content of 4.57% of the mass, showed that with the field parameters close to the calculated, the magnetic vibrating layer of iron powder PZh-4M has the maximum development; increasing the separation time leads to more efficient separation in the interval of field induction gradient from 550 mT/ m to 610 mT/m.

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“…Mechanical milling is widely spread in powder production from brittle materials in powder metallurgy. Milling intensity can be increased by forming fluidized bed [1] from mill material by applying alternating gradient and constant magnetic fields on processed material [2,3]. Physical characteristics and technological properties of powders greatly influence on product properties [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Milling Regimes in Beater Mill on Particle Size Distribution and Structural Characteristics of Strontium Hexaferrite Powder

Yegorov

Egorov

2018

SSP

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The paper experimentally substantiates effectiveness of method of milling particulate ferromagnetic materials in magneto fluidized bed. Comparative results of particle size distributions and structural parameters of strontium hexaferrite SrFe12O19 powder obtained by milling coarse material in beater mill without electromagnetic effect and in same mill with formation of magneto fluidized bed from mill material are presented. The magneto fluidized bed is formed by constant and alternating gradient magnetic fields with induction lines that are mutually perpendicular and parallel to the plane of rotating beaters. It is shown that application of electromagnetic effect to milling coarse material in beater mill allowed to greatly intensify that process, significantly increase powder quality: increase particle size distribution uniformity and decrease average particle size from 1558.50 μm to 0.56 μm after 120 minutes of processing in the mill. X-ray diffraction analysis showed that milling in beater mill in magneto fluidized bed leads to reduction of coherent-scattering region size, increase of lattice microstrain and dislocation density, making powder more active during sintering process.

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Disperse ferromagnet in the magnetovibrating layer

Cited by 6 publications

References 1 publication

Network high-performance grinding devices for ferromagnetic materials

Network high-performance grinding devices for ferromagnetic materials

Selection of Non-Magnetic Fraction from the Slime Wastes of Metal Production in the Electromagnetic Field

The Influence of Milling Regimes in Beater Mill on Particle Size Distribution and Structural Characteristics of Strontium Hexaferrite Powder

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