SU1319929A1 - Method of separating loose materials - Google Patents

Abstract

This invention relates to a process for separating bulk materials (M) into fractions, and b. used in the asbestos industry for the removal of asbestos concentrates, as well as for the dedusting of grain and cotton. The purpose of the invention is to increase the efficiency of separation of bulk. with fibrous inclusions. The initial asbestos-containing L is supplied for separation in the field of action of opposing centrifugal and aerodynamic forces. The fibrous fraction separated from the initial M, containing small fine particles of particles, is subjected to additional cleaning in the field of action of opposing centrifugal and aerodynamic forces. At the same time, cleaning is carried out with a centrifugal force equal to 0, 2-10 N, and an aerodynamic force 3-6 times higher than the centrifugal force. Due to the weakening of the mechanical connection between the rock particles and the fiber, additional separation of the rock particles from the asbestos fibers occurs. 1 ill., 1 tab. § (L with tal SO with 1h :) with

Description

The invention relates to the technology of separating bulk materials into fractions, for example asbestos-containing products, and can be used in the asbestos industry for the removal of asbestos concentrates, as well as for the dedusting of grain and cotton and other bulk and fibrous materials.

The aim of the invention is to increase the efficiency of separation of bulk materials with fibrous inclusions.

The drawing shows a device that implements the proposed method.

The proposed method includes the following operations: feeding the initial asbestos-containing material for separation in the field of action of opposing centrifugal and aerodynamic forces; the selection of the fibrous fraction (fibrous inclusions) from the source material; impact on the fiber fraction by centrifugal force equal to (0.1-0.2). 10 N, and the aerodynamic force opposed to it, and alternating centrifugal 3-6 times.

The device (separator) comprises a housing 1, a rotor 2, a disk 3, scattering the source material, a separating body 4 made in the form of a fan wheel with blades 5, discharge devices 6 and 7 of the fibrous and granular fractions, respectively.

Example. The starting material, containing asbestos fiber and rock particles, is fed to a disk 3 rotating at a speed of 30-40 rpm that spreads the starting material. From the periphery of the disk 3, light particles with a reduced speed of vitamins — asbestos fiber and fine rock fraction — are picked up by the air flow and then get to the separating organ 4. The air flow in the separator is created by suctioning air at a speed of 4-6 m / s through the discharge device 6 of the volcano fraction, associated with the pneumatic system. Larger breeds

0.2 0.2 0.2 0.2

0.5 0.6 0.8 0.9

Particles with a high soaring rate fall out into the lower part of the housing 1 into the discharge device 7. The isolated fibrous fraction containing fine particles is separated on the separating body 4 in the field of the opposite direction of the forces - centrifugal created by the rotation of the rotor 2 and equal to (0.1 - 0.2) 10 N, and aerodynamic, created by the booster of air flow and 3 to 6 times the centrifugal force. In the channels between the blades 5 of the rotating separating body 4 under the influence of opposing forces — centrifugal and aerodynamic — an additional separation of the rock particles from the asbestos fibers occurs due to the weakening of the mechanical connection between the rock particles and the fiber. Particle particles are ejected by centrifugal force on the ne. The periphery of the separating organ 4, from which it is thrown to the walls of the housing 1 and rolled over it to the discharge device 7. The aerodynamic force, exceeding the centrifugal force by 3-6 times, can only affect the fiber fraction, which is separated by air flow from the rock particles the separator body 4 and is removed from the separator through the discharge device 6. During the tests, the boundary values of the magnitude of the centrifugal force and its relation to the oppositely directed aerodynamic force were determined. The range of magnitudes of forces, their ratio is determined by the separation efficiency indicator, which should not be less than 95%, and the content of halia (rock particles) in the final product should not exceed 30/0.

The tests were carried out with an increase in the aerodynamic force relative to the stabilized values of the centrifugal force determined experimentally.

0 The test results are shown in the table.

0

five

0.5

90.2 98.2 99.9 99.4

2.5 3.0 4.0

,five

With a centrifugal force of less than 0.1 - H, the separation process is unstable, the separation efficiency and the separator's productivity also increase. In the case of an increase in the centrifugal force of more than 0.2–10 N, intensive scattering of the material occurs, which makes it difficult to separate the fibrous fraction from the granular.

When processing the selected fibrous fraction in the zero of the action of the centrifugal force of equal (0.1-0.2) - 10 N, a high separation efficiency of 96.0-99.9% was obtained when the fibrous fraction was affected by aerodyne. - centrifugal correct and transform it 3-6 times; There are practically no native particles in the concentrate — hali (experiments 2, 3) or the hali content in the concentrate is within the requirements.

Exceeding the aerodynamic force of more than 6 times the maximum values of centrifugal force is impractical because the concentrate (fiber fraction) extracts gal, the air particles trap the rock and carry it away with the fiber, which reduces the separation efficiency. AT

Table continuation

In case of separation under conditions when the aerodynamic force is less than 3 times the centrifugal force, the separation efficiency decreases because there is not enough aerodynamic force to separate the material into the fibrous and granular (rock) fraction in the field of oppositely directed centrifugal force.

Claims (1)

Invention Formula The method of separation of bulk materials in the field of opposing centrifugal and aerodynamic forces, characterized in that, in order to increase the efficiency of separation of bulk materials with fibrous inclusions, the selected fibrous inclusions are subjected to additional cleaning in the field of opposing centrifugal and aerodynamic forces, with this cleaned up It is performed by a centrifugal force equal to 0.1 XX 10, H, and an aerodynamic force 3-6 times higher than the centrifugal force.