JP6283084B2 - Improved material separation and recovery matrix for dry vibratory magnetic filters - Google Patents

Description

  There are many types of magnetic separators used to remove fine ferromagnetic and paramagnetic particles from powders. One particular type of separator, a dry oscillating magnetic filter (DVMF), utilizes a variety of magnetizable grids stacked together to form a matrix assembly. This matrix assembly produces a very strong magnetic field gradient that removes fine ferromagnetic and paramagnetic particles from the powder passing through the DVMF. The DVMF is an iron-clad, DC, electromagnetic coil with an aperture bore. Located in the bore is a canister that holds the matrix assembly. The matrix assembly comprises a series of stacked laminate matrices that are typically held in place and suspended by a single rod that passes through the center of the matrix assembly. The canister vibrates to facilitate the flow of fines through the DVMF. The magnetic field present in the bore induces a high magnetic field gradient in the matrix assembly that captures and retains the magnetic particles.

  What is presented comprises a container for an improved metal grid matrix and a matrix assembly of DVMF. The matrix provides a number of collection points. The open cross-sectional area of the matrix allows for high throughput. The container allows for quick replacement of a dirty or worn matrix assembly. Matrix construction is easily adapted to automated construction techniques.

  Presented is a dry oscillating magnetic filter comprising a canister assembly including a laminated matrix stack, a spring suspension that suspends the canister assembly, and a vibration drive that oscillates the canister assembly. The laminated matrix stack comprises a plurality of magnetizable matrix grids. Each magnetizable matrix grid comprises an outer ring which is one of ferritic stainless steel or austenitic stainless steel. Each magnetizable matrix grid includes a plurality of tubes to be cut, and each tube to be cut is arranged in a single layer in a vertical direction suspended in the outer ring and fills a cross-sectional area of the outer ring. The outer ring has a first length, and each tube to be cut has a second length that is less than the first length. This difference in length creates a gap between the outer edge of the outer ring and the top and bottom of each cut tube. Each tube to be cut is attached to at least one other tube to be cut or to an outer ring. The laminated matrix stack comprises alternating layers of magnetizable matrix grids, the alternating layers of magnetizable matrix grid comprising either ferritic stainless steel or austenitic stainless steel. The tube to be cut has a cross-section that is one of circular, square, rectangular, or other shape. The canister assembly of the dry vibration matrix filter may comprise a matrix case that houses the laminated matrix stack.

  Those skilled in the art will appreciate that the present invention is capable of different embodiments than those shown, and that details of the apparatus and method may be varied in various ways without departing from the scope of the invention. Accordingly, the drawings and descriptions are to be regarded as including such equivalent embodiments without departing from the spirit and scope of the present invention.

  For a more complete understanding and evaluation of the present invention, and for its many advantages, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

It is a cutaway view of a dry vibration magnetic filter showing the internal components of the canister assembly. FIG. 2 is an exploded view of the canister assembly of FIG. 1. FIG. 2 is a perspective view of the laminated matrix stack of FIG. It is a perspective view of the canister of FIG. It is a perspective view of the matrix case of FIG. It is a perspective view of the adapter of FIG. FIG. 2 is a top view of the magnetizable matrix grid of FIG. 1. FIG. 8 is a cross-sectional view of the magnetizable matrix grid of FIG. 1 is a top view of a prior art magnetizable matrix grid. FIG. 1 is a top view of a prior art magnetizable matrix grid. FIG. 1 is a top view of a prior art magnetizable matrix grid. FIG.

  With reference to the drawings, reference numerals may be used to indicate the same or corresponding parts throughout the several embodiments and drawings shown and described. Corresponding parts are represented in different embodiments with lower case letters. Variations of corresponding parts in the form or function depicted in the figures are described. Variations in the embodiments can generally be substituted without departing from the invention.

  FIG. 1 shows a DVMF 10 used to process materials in the mining, dispensing, raw material, and food industries. The treated material usually remains dry and typically contains fine ferromagnetic and paramagnetic contaminants that are intended to be removed by DVMF. The material is mostly fine and does not flow freely. The DVMF 10 includes a canister assembly 12 that is suspended from a spring suspension 14. The vibration drive 16 causes the spring suspension 14 to vibrate the canister assembly 12 as the dry powder passes through the canister assembly 12. This vibration provides a means of separating the dry powder. The laminated matrix stack 22 in the DVMF 10 is magnetized to attract and remove ferromagnetic and paramagnetic contaminants in the material that passes when the canister assembly 12 vibrates by the vibration drive 16. While the system discussed herein focuses on the separation of dry matter, it is expected that it can be successfully applied to high viscosity slurries.

  FIG. 2 is an exploded view of the canister assembly 12, which includes a canister 18 and an adapter 20 that allows the canister assembly 12 to be attached to the DVMF 10. The canister assembly 12 holds a stacked matrix stack 22 (shown in FIG. 3) comprising a plurality of magnetizable matrix grids 24 (discussed in more detail below). In this embodiment, a matrix case 26 is added so that the laminated matrix stack 22 can be installed and removed from the DVMF 10 as a whole for cleaning and replacement. This arrangement for housing the laminated matrix stack 22 increases the available cross-sectional area and improves the dry powder throughput. There may be other ways to hold the laminated matrix stack 22 in place.

  As shown in FIG. 3, the laminated matrix stack 22 comprises a plurality of magnetizable matrix grids that are stacked one above the other. FIG. 4 shows a perspective view of the canister 18. The canister 18 includes a hollow cylinder 28 having a flanged top 30 that houses a series of bolts 32 that are used to attach the matrix case to the DVMF 10. As can be seen in FIG. 1, the canister 18 is directly attached to the body of the DVMF 10 and connects to the spring suspension 14 and the vibration drive 16.

  FIG. 5 shows a perspective view of the matrix case 26 that holds the laminated matrix stack 22 when attached to the DVMF 10. The matrix case 26 includes a holding tube 34 that is dimensioned to enter the hollow cylinder 28 of the canister 18. The matrix case 26 further includes a flange 36 having a series of bolt openings 38. The flange 36 allows the matrix case 26 to ride on top of the canister 18. The bolt opening 38 is aligned with the bolt 32 of the canister 18 such that the bolt 32 passes through the bolt opening 38 and the flange 36 and the flanged top 30 are secured together when the DVMF 10 is fully assembled. . The laminated matrix stack 22 is sized to fit the diameter of the holding tube 34. In the embodiment shown in FIG. 5, the lower portion of the retaining tube 34 is corrugated 40 inward to reduce the diameter of the retaining tube 34 and prevent the laminated matrix stack 22 from slipping down. This allows the laminated matrix stack 22 to be quickly and easily removed and replaced from the DVMF 10 simply by removing and replacing the matrix case 26. Other means of holding the laminated matrix stack 22 may be used.

  FIG. 6 shows a perspective view of the adapter 20 covering the top of the canister assembly 12. The adapter body 42 is dimensioned to fit in the retaining tube 34 and rides directly above the laminated matrix stack 22 of the assembly canister assembly 12. The upper flange 44 has a series of screws 46 that align with the bolts 32 on the canister 18. Screw 36 secures adapter 20 to canister 18 and seals canister assembly 12.

  FIG. 7 shows a top view of the magnetizable matrix grid 24 and FIG. 8 shows a cross section as shown. As best understood by comparing FIGS. 7 and 8, each magnetizable matrix grid 24 includes a peripheral ring 48, the peripheral ring 48 being arranged and secured to fit within the peripheral ring 48. The to-be-cut tube 50 is provided. The outer ring 48 is a tube having a first length, each cut tube 50 has a second length that is less than the first length, and each cut tube 50 is formed by the outer ring. It is arranged in a single layer in the vertical direction suspended in 48 and fills the cross-sectional area of the outer ring 48 as shown in FIG. The difference in length creates a gap 52 between the outer edge of the outer ring 48 and the upper and lower sides of the respective cut pipes 50. Each cut tube 50 is attached to at least one other cut tube 50 or to the outer ring 48. This may be achieved by spot welding or other means of holding the matrix together.

  Important properties for the function of the magnetizable matrix grid 24 are ferromagnetism, acute angles, surface area, packing density, structural integrity, cost, and product flow-through capability. Ferromagnetism is satisfied by the use of mild steel or 400 series stainless (ferritic) stainless steel, however it must be applied properly. Laminating the layers of the magnetizable matrix grid 24 together tightly with no space between them can result in magnetic field line shunting. To prevent this, each magnetizable matrix grid 24 in the laminated matrix stack 22 has a peripheral ring 48 of alternating ferritic and austenitic stainless steel materials. The gap 52 further prevents shunting and increases magnetic concentration. Each one of the cut tubes 50 creates a number of magnetic concentration points that enhance the magnetic separation potential. A round cut tube 50 is used to provide a point of magnetic concentration, but alternative readily available tubes such as squares, rectangles, or other cross-sectional shapes can be used.

  FIGS. 9-11 show a prior art magnetizable matrix grid that is a structured bar grid (FIG. 9), a honeycomb shape (FIG. 10), and an expanded metal mesh (FIG. 11). Many tests have shown the advantages of a magnetizable matrix grid that is a cut tube (FIG. 7) compared to an expanded metal mesh (FIG. 11) and a bar grid (FIG. 9).

  The invention has been described with reference to several preferred embodiments. Many changes and modifications will occur to others upon reading and understanding the foregoing specification. The present invention is intended to be construed to include all such modifications and variations as long as they come within the scope of the appended claims or their equivalents.

Claims (6)

A dry vibration magnetic filter,
A canister assembly including a laminated matrix stack;
A spring suspension for hanging the canister assembly;
A vibration drive for vibrating the canister assembly;
With
The stacked matrix stack comprises a plurality of magnetizable matrix grids, each of the magnetizable matrix grids being
An outer ring having a first length, wherein the outer ring comprises one of ferritic stainless steel or austenitic stainless steel;
A plurality of pipes to be cut;
With
The plurality of pipes to be cut are
Each of the tubes to be cut has a second length that is less than the first length;
Each of the pipes to be cut is arranged in a single layer in the vertical direction suspended in the outer ring, fills the cross-sectional area of the outer ring, and the outer edge of the outer ring and the upper and lower sides of the cut pipe Create a gap between
Each said cut tube is attached to at least one other cut tube or to an outer ring;
The laminated matrix stack comprises a dry oscillating magnetic filter comprising alternating layers of the magnetizable matrix grid, the alternating layers of the magnetizable matrix grid comprising either ferritic stainless steel or austenitic stainless steel.   The dry oscillating magnetic filter of claim 1, wherein the canister assembly further comprises a matrix case including the laminated matrix stack.   2. The dry vibration magnetic filter according to claim 1, wherein the tube to be cut has a cross section that is one of a circle, a square, and a rectangle. A magnetizable matrix grid for dry vibratory magnetic filters,
An outer peripheral ring having a first length;
A plurality of pipes to be cut;
With
The plurality of pipes to be cut are
Each of the tubes to be cut has a second length that is less than the first length;
Each of the pipes to be cut is arranged in a single layer in the vertical direction suspended in the outer ring, fills the cross-sectional area of the outer ring, and the outer edge of the outer ring and the upper and lower sides of the cut pipe Create a gap between
Each said tube to be cut is attached to at least one other tube to be cut or to an outer ring,
Magnetizable matrix grid.   The magnetizable matrix grid of claim 4, wherein the outer ring comprises one of ferritic stainless steel or austenitic stainless steel.   5. The magnetizable matrix grid of claim 4, wherein the tube to be cut has a cross section that is one of a circle, a square, or a rectangle.