GB1594267A - Cleaning of magnetic separators - Google Patents
Cleaning of magnetic separators Download PDFInfo
- Publication number
- GB1594267A GB1594267A GB3184177A GB3184177A GB1594267A GB 1594267 A GB1594267 A GB 1594267A GB 3184177 A GB3184177 A GB 3184177A GB 3184177 A GB3184177 A GB 3184177A GB 1594267 A GB1594267 A GB 1594267A
- Authority
- GB
- United Kingdom
- Prior art keywords
- matrix
- cleaning
- magnetic
- gas bubbles
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000006148 magnetic separator Substances 0.000 title claims description 15
- 238000004140 cleaning Methods 0.000 title claims description 13
- 239000011159 matrix material Substances 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 14
- 230000005291 magnetic effect Effects 0.000 claims description 13
- 238000011010 flushing procedure Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 6
- 239000011236 particulate material Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005298 paramagnetic effect Effects 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002907 paramagnetic material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/06—Filters making use of electricity or magnetism
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/025—High gradient magnetic separators
- B03C1/031—Component parts; Auxiliary operations
- B03C1/032—Matrix cleaning systems
Landscapes
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
Description
( 21) Application No 31841/77 ( 22) Filed 28 July 1977
( 23) Complete Specification filed 30 May 1978 ( 44) Complete Specification published 30 July 1981 ( 51) INT CL 3 B Ol D 35/06 ( 52) Index at acceptance B 2 J 101 304 307 403 404 T ( 72) Inventor ROBERT POTTS 1594267 ( 19) ( 54) CLEANING OF MAGNETIC SEPARATORS ( 71) WC, INTERNATIONAL RESEARCH & DEVELOPMENT COMPANY LIMITED, a British Company, of Fossway, Newcastle-uponTyne NE 6 2 YD, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:The present invention relates to the cleaning of the filter matrix in a magnetic separator, especially a high-gradient magnetic separator intended for the removal of magnetic or paramagnetic particles from a fluid stream.
It is well known in magnetic separators to employ a filter matrix within an electromagnetic structure which includes electrical coils for inducing a magnetic field in the filter matrix The matrix is made of a material which enables high field gradients to be created so that when the fluid stream, which may be a slurry, is directed through the matrix by way of inlet and outlet conduits, particles of magnetic or paramagnetic material are trapped in the matrix and thus extracted from the fluid The strength of magnetic field required is dependent on the nature of the fluid and the particles to be removed The filter employed usually comprises a canister which contains a quantity of ferromagnetic material such as thin sharp ribbons of stainless steel, steel balls, tacks, or stainless steel wool, the latter being preferred in current designs because it enables higher field gradients and a greater packing factor to be achieved.
In such magnetic separators it is necessary to clean the matrix periodically since otherwise the filter gradually becomes clogged with particulate material and the efficiency of the extraction process is consequently reduced One method of cleaning is to switch off the field at suitable intervals and reverse the flow of fluid to back flush through the filter and thereby dislodge the particulate material from the filter This produces a sludge with a high water content and the subsequent de-watering of the sludge is difficult to carry out economically It has also been proposed to assist the removal of the particulate material by the application of an alternating field during cleaning but this increases the complexity and expense of the aparatus without overcoming the de-water 55 ing problem.
In accordance with the present invention there is provided a method of cleaning the matrix of a magnetic separator wherein cleaning fluid is flushed through the matrix 60 in the absence of the separating magnetic field characterised in that gas bubbles are produced in the flushing fluid in such a way as to create turbulence in the flushing fluid and thereby to assist in the removal of 65 particulate material from the matrix.
The gas bubbles may be produced by injection of air, steam or gas this injection being carried out under a pressure sufficiently high to create the required turbulence 70 in the flushing fluid Alternatively the bubbles may be produced in other ways, for example ultrasonically, and again the production of the bubbles must be such as to create turbulence 75 The invention will now be described in more detail with the aid of an example illustrated in the drawing accompanying the Provisional Specification, the single figure of which shows diagrammatically in cross-sec 80 tional elevation a magnetic separator constructed to enable the cleaning method of the invention to be employed.
The magnetic separator comprises a canister 10, made from a material of low 85 magnetic permeability, in the form of a cylinder, for the containment of a filter matrix, not shown, which in the present preferred embodiment comprises a quantity of compressed stainless steel wool The can 90 ister 10 is contained within a magnetic iron circuit comprising a cylindrical body portion 11 and return frame end caps 12 and 13 which increase the efficiency of the magnetic circuit The end caps are secured as by 95 bolting to the body portion 11 and have central through bores to which are attached inlet and outlet manifolds 14 and 15.
An electromagnetic coil 16 is contained within a recess 17 in the body portion 11 and 100 PATENT SPECIFICATION ( 11)
1,594,267 surrounds, in close proximity, the major portion of the canister 10.
The lower end-cap 13 has a counter-bored internal recess 18 which houses a circular coiled portion 20 of a pipe 19 A perforated plate 21 is positioned over the coiled portion to cap the recess 18 The opposite end of pipe 19 is connected to a source of highpressure air, not shown.
In operation for the purpose of removing particles from a slurry, the electromagnetic coil is energised to create an axial magnetic field within the canister 10 The nature of the material within the canister 10 is such that it produces high-magnetic field gradients in the known manner such that magnetic or paramagnetic particles within the slurry are captured by the magnetic field as the slurry flows through the canister After a period of time the amount of particles captured on the filter matrix reduces the efficiency of the apparatus and it therefore becomes necessary to clean the filter.
To clean the filter the slurry flow is stopped and the magnetic coil is de-energized A water supply is then connected to the outlet manifold 15 to provide a flow of back-flushing water in the reverse direction to the normal flow At the same time, the compressed air supply to the pipe 19 is switched on so as to inject compressed air through holes in the coiled portion 20 into the canister 10 The injection of high pressure air into the water forms bubbles which create turbulence and which collect around the adherent particles and produce high shearing rates which enable the particles to be readily removed from the filter matrix This process also results in a lower water content sludge which makes subsequent de-watering operations much simpler.
This invention is not limited by the form of the embodiment herein described, nor to the type of matrix referred to, other embodiments and forms of matrix will become apparent to those skilled in the art.
treated through the matrix, means for flushing the matrix with a cleaning fluid, and means for producing gas bubbles to create turbulence in the flushing fluid.
A magnetic separator as claimed in claim 4 in which the means for producing gas bubbles comprise a pipe connected to a source of air, steam or gas under pressure and having a plurality of openings through which the gas bubbles can enter the matrix.
6 A magnetic separator as claimed in claim 5 in which the flushing means are arranged to produce a flow of cleaning liquid through the matrix from the outlet to the inlet and the pipe supplying the gas bubbles has a coiled portion disposed around the outlet, the said plurality of openings being formed in the coiled portion of the pipe.
7 A magnetic separator substantially as described with reference to the accompanying drawing.
8 A method of cleaning a magnetic separator substantially as described with reference to the drawing accompanying the Provisional Specification.
REDDIE & GROSE, Agents for the Applicants, 16 Theobalds Road, London WCIX 8 PL.
Printed for Her Majesty's Stationery Office by Burgess & Son (Abingdon) Ltd -1981 Published at The Patent Office, Southampton Buildings, London, WC 2 A l AY.
from which copies may be obtained.
Claims (4)
1 A method of cleaning the matrix of a magnetic separator wherein cleaning fluid is flushed through the matrix in the absence of the separating magnetic field characterized in that gas bubbles are produced in the flushing fluid in such a way as to create turbulence in the flushing fluid and thereby to assist in the removal of particulate material from the matrix.
2 A method as claimed in claim 1 in which the gas bubbles are produced by injection of air, steam, or gas under pressure.
3 A method as claimed in claim 1 in which the gas bubbles are produced ultrasonically.
4 A magnetic separator having an inlet and an outlet for the passage of a slurry to be
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3184177A GB1594267A (en) | 1978-05-30 | 1978-05-30 | Cleaning of magnetic separators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3184177A GB1594267A (en) | 1978-05-30 | 1978-05-30 | Cleaning of magnetic separators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1594267A true GB1594267A (en) | 1981-07-30 |
Family
ID=10329196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3184177A Expired GB1594267A (en) | 1978-05-30 | 1978-05-30 | Cleaning of magnetic separators |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1594267A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4769130A (en) * | 1982-03-12 | 1988-09-06 | A/S Niro Atomizer | High-gradient magnetic separator |
-
1978
- 1978-05-30 GB GB3184177A patent/GB1594267A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4769130A (en) * | 1982-03-12 | 1988-09-06 | A/S Niro Atomizer | High-gradient magnetic separator |
| US4772383A (en) * | 1982-03-12 | 1988-09-20 | A/S Niro Atomizer | High-gradient magnetic separator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |