Magnetic separator

FIELD: process engineering.

SUBSTANCE: invention relates to magnetic separation of sold materials from fluids, namely, to magnetic separators with material cylindrical drives and may be used in separation of emulsions and suspensions. Magnetic separator comprises feeding and discharging channels for magnetic and nonmagnetic materials, working member made up of inner and outer cases made from nonmagnetic materials, device to separate flow into magnetic and nonmagnetic fractions, and filter element from ferromagnetic. Filtration element is made up of two aligned spirals made from magnetically soft ferromagnetic different-diameter wires with pitch equal to 3-5 wire diameters wound on outer surface of inner case and buried flush with case surface to produce induction of disturbed magnetic field flow with high radial gradient in formed clearance between cases of magnetic system.

EFFECT: higher efficiency, decreased overall dimensions and weight.

2 dwg

 

The invention relates to the field of magnetic separation of solid materials from the fluid, namely, magnetic separators with a cylindrical device material moving and stationary magnets, and can be applied in thin separation of emulsions, suspensions and suspensions.

The prior art magnetic separator from the description of an invention to the patent of Russian Federation №2245194 C2, CL B03C 1/14, publ. 27.01.2005, bull. 3, includes a feeder, feeding and discharge channels for the magnetic and non-magnetic products, work the body in the form of a non-magnetic drum is located within the magnetic system of the main and additional permanent magnets with alternating polarity.

The disadvantage of the described device is the lack of efficiency in thin separation of heterogeneous systems based fine particles.

From the patent RU 2390381, CL B03C 1/14, publ. 27.05.2010, bull. No. 15 known magnetic separator, including feeding and discharge channels for the magnetic and nonmagnetic fractions, the working body is located within the magnetic system of permanent magnets with alternating polarity. The working body is an inner and outer shells are made of a nonmagnetic material, with the two magnetic systems of permanent magnets that create in the annular gap is between the buildings along the flow axis the radial outer pseudomonotone magnetic field H 0and has a separator fractions. The filter element of spiral form on the outer side of the inner case made of soft ferromagnetic material.

The disadvantage of this magnetic separator is the lack of productivity and efficiency.

The analysis of the known magnetic separators found that improvement in the main indicators of the separators in the effective separation of dispersed particles is achieved by increasing the gradient magnetic field strength in the separation zone at the expense of reducing the size (diameter) of the filter elements, which reduces the performance of the separator, increasing its mass and dimensions.

An object of the invention is to increase the efficiency of separation, including improving the performance of the separator while reducing its weight and dimensions by expanding the coverage of the high-gradient magnetic field of the filter element, the transverse movement of the separated environment.

The technical result of the invention is achieved in that in the magnetic separator, including loading and unloading channels under magnetic and non-magnetic products, working body, representing the inner and outer shells are made of nonmagnetic materials the two magnetic systems of permanent magnets, a separator to separate the flow into magnetic and nonmagnetic fractions, the filter element of the spiral form of soft ferromagnetic material, a filter element made in the form of two spirals combined with each other, the soft ferromagnetic wires of different diameters, are wound on the outer surface of the inner housing in increments of 3-5 wire diameter and depth in the surface of the flush, which creates an annular gap between the buildings of the magnetic system along the flow axis perturbed radial magnetic field with a large radial gradienta its size.

Figure 1 shows the scheme of a magnetic separator, figure 2 is a longitudinal cross-section of the annular channel separation of flow (shown two options for placement of the filter elements relative to each other, b).

The separator (figure 1, 2) consists of an inner 1 and outer 2 buildings made of a nonmagnetic material, the magnetic system 3 and the separator 4, the boot channel 5 and the discharge channels I, II. On the outer surface of the housing 1 are wound together two thin wire of various diameters in increments of 3-5 of their diameters. Wire of magnetic ferromagnetic materials with spiral winding and depth in the surface are flush filter elements 6 (FA and the E2), see figure 2. The difference in diameters FE and FE allows you to expand the zone of high heterogeneity of the perturbed magnetic field Feh and thereby to increase the width of the annular working channel between the housings 1, 2.

The technical result of the invention is improving the efficiency of separation of the separated environment, increasing productivity and reducing its weight and length.

Magnetic separator works as follows.

The separated environment through the loading channel 5 enters the annular channel between the housings 1 and 2, in which there is flow separation (separation) of a heterogeneous medium, the difference in diameters FE and FE allows you to expand the zone of high heterogeneity of the perturbed magnetic field Feh and thereby to increase the width of the annular working channel between the housings 1, 2. This improves the efficiency of the separation of the separated environment, the performance of the device and to reduce its length and weight. Occurs the separation of weakly magnetic and magnetic dispersed particles from the dispersion liquid or gaseous medium through the magnetic gel in cross vozmuschennoi inhomogeneous magnetic field. The process diagram shown in figure 2 (shown in two variants - a, b placement FE and FE relative to each other).

The medium containing dispersed magnetic fraction goes through razgruzochnih the th channel I, purified non-magnetic dispersion fraction - through channel II. Separation of these fractions is done by using the separator 4.

Indicate on the diagram the flow separation (figure 2) of dispersed particles in longitudinal cross-section of the annular channel between the housings 1 and 2 magnetic separator:

υ1- the average axial velocity of the dispersed particles in the flow;

υm- foretical speed of the dispersed particles, i.e., the speed of sedimentation of the particles, sold under the action of the gradient of the perturbed magnetic field;

r0- radius FA; k is the ratio of the radii FA to FA;

a - gap width of the annular channel;

a1- part of the width of the gap, which is approaching the extreme dispersed particle to filtration element FE on the length of the duct length L;

b1- the width of the gap discharge channels of the separator, which is approaching the extreme dispersed particle to filtration element Feh on the section length L1(one of these gaps may be absent).

Magnetic separator, including loading and unloading channels under magnetic and non-magnetic products, working body, representing the inner and outer shells are made of nonmagnetic materials with two magnetic systems of permanent magnets, a separator for separating magnetic flux, Nemani the percent fraction the filter element of the spiral form of soft ferromagnetic material, characterized in that the filtering element is made in the form of two spirals, combined with each other, the soft ferromagnetic wires of different diameters, are wound on the outer surface of the inner housing in increments of 3-5 wire diameter and depth in the surface of the flush, which creates an annular gap between the buildings of the magnetic system along the flow axis perturbed radial magnetic field with a large radial gradient of magnitude.



 

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