SU1558486A1 - Method of electric classification of granular materials - Google Patents

Abstract

The invention relates to the separation of homogeneous in physical properties of granular materials by size in the manufacture of grinding and metal powders and improves the classification efficiency of granular material in the size range of 0.02-5 mm. The separable granular material is fed into the interelectrode gap formed by sectional vertically mounted along the course of movement of the ZM grid electrodes of opposite polarity. The cell size of the mesh electrodes of each section is chosen to be 1.1-1.6 of the maximum width of the particle of granular material selected on this section. The classification is carried out at the electrostatic field strength (6-8) ^. 10 ⁵ V / m and interelectrode distance (2-4) ^. 10 ^-2 m. The height of each section is chosen not less than 60-70 interelectrode distances. Particles of granular material in the interelectrode space under the action of an electric field receive directional movement to the electrodes. Fine particles pass freely through the screen and are removed to the receivers of the sifter products. Large particles cannot pass through the electrodes and are output from the interelectrode space to the coarse fraction receivers.

Description

(21) 4326179 / 23-03

(22) 11/09/87

(46) 04.23.90. Bul Number 15

(71) Ukrainian Printing Institute. Ive Fedorov

(72) E. S. Viksman, A. D. Chaplinsky, D. N. Schneider, A. I. Angelov, V. I. Revnivtsev, V. A. Nikulin, I. P. Vereshchagin, and S. A. Krivoe

(53) 622.777 (088.8)

(56) USSR Copyright Certificate No. 250784, cl. B 03 C 7/00, 1967.

USSR author's certificate number 1036388, cl. B 03 C 7/12, 1980.

(54) METHOD OF ELECTRIC CLASSIFICATION OF GRAIN MATERIALS

(57) The invention relates to the separation of homogeneous in physical properties of granular materials by size in the manufacture of grinding and metal powders and improves the classification efficiency of granular material in

size range 0.02-5 mm. The separable granular material is fed into the interelectrode gap formed by sectional vertically mounted in the direction of movement of the granular material by grid electrodes of opposite polarity. The cell size of the grid electrodes of each section is chosen to be 1.1 -1.6 of the maximum width of the particle of granular material selected on this section. The classification is carried out at electrostatic field strengths (6-8) X XI O5 V / m and interelectrode distance (2-4) -1СГ2 m. The height of each section is chosen not less than 60-70 interelectrode distances. Particles of granular material in the interelectrode space under the action of an electric field receive directional movement to the electrodes. Fine particles pass freely through the screen and are removed to the receivers of the sifter products. Large particles cannot pass through the electrodes and are output from the interelectrode space to the coarse fraction receivers.

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The invention relates to the separation of materials by size, in particular to the classification of granular materials using strong electric fields, and can be used in technological processes for the separation of materials that are homogeneous in physical properties into narrow fractions, for example, in the production of grinding materials, powder metallurgy products and t .P.

The purpose of the invention is to improve the classification efficiency of a granular material in the size range of 0.02-5 mm.

The method includes the supply of materials in the interelectrode gap formed

sectional vertically mounted in the course of movement of the material mesh electrodes of opposite polarity, and the withdrawal of separation products. The size of the holes in the cells of the grid electrodes on each section is chosen to be 1.1 -1.6 of the maximum width of the particle selected in this section, and the classification is carried out with an electrostatic field strength of (6-8) -105 V / m, and interelectrode distance (2-4). The height of each section is chosen not less than 60-70 interelectrode distances.

The method is carried out as follows.

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Claims (1)

By the loading device of a particle, the formula of the invention of the material being classified is fed through granular materials through a funnel, through which the form-electric method for classifying a stream of particles and their charge is carried out, including feeding from the interelectrode space, the sample material into the inter-electrode gap formed by sectional vertically calibrating surfaces. Particles mate-established in the course of the movement of the material, carrying on themselves various quantities of mesh electrodes of the opposite poly- genus, positive and negative luminance, and the output of separation products, charges, fall into the space between those differing in that with the aim of calibrating the surface of the classification of grain-electrodes is obtained; a directional moving material is obtained in a size range of 0.02% to them. Particles whose size is 5 mm, the size of the openings of the cells of the mesh corresponds to the size of the cells of the calibrating electrodes on each section, select the surfaces of the electrodes, pass 1.1 to 1.1 by the free width from the maximum width from them to sections of the particle, when in receivers products sifting. Particles, this classification is carried out with the size of which causes the electrostatic field to be impossible, their passage through the electrode, equal to (6-8) -10a V / m, and the interelectrode ultimately derived from the interelectrode distance (2 -4) -10g2m, and the height of each space in the receivers of the large frac section is chosen to be at least 60-70 interelectic ..20 native distances.