CA1213858A - Process for concentrating mixed martite-hematite ore - Google Patents
Process for concentrating mixed martite-hematite oreInfo
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- CA1213858A CA1213858A CA000435236A CA435236A CA1213858A CA 1213858 A CA1213858 A CA 1213858A CA 000435236 A CA000435236 A CA 000435236A CA 435236 A CA435236 A CA 435236A CA 1213858 A CA1213858 A CA 1213858A
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- magnetic
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Abstract
Abstract A process is described for concentrating a mixed martite/hematite ore using wet high intensity magnetic separators, such as Jones Separators. A slurry of the mixed ore is first passed through a primary grooved-plate high intensity wet magnetic separator having plate gaps of 3 mm to 15 mm, groove widths 1 to 3 times the gap distance and a magnetic intensity of 2000 to 10000 gauss, thereby separating the slurry into a first magnetic stream, a first middling stream and a first non-magnetic stream.
This first magnetic stream is collected as product and the first middling stream and first non-magnetic stream are combined to become a feed slurry through a secondary grooved plate high intensity wet magnetic separator having plate gaps of 1 mm to 3 mm, groove widths of less than about 4 mm and a magnetic intensity of about 5000 to 15000 gauss, thereby again separating the slurry into a second magnetic stream, a second middling stream and a second non-magnetic stream. The second magnetic stream is also collected as product.
This first magnetic stream is collected as product and the first middling stream and first non-magnetic stream are combined to become a feed slurry through a secondary grooved plate high intensity wet magnetic separator having plate gaps of 1 mm to 3 mm, groove widths of less than about 4 mm and a magnetic intensity of about 5000 to 15000 gauss, thereby again separating the slurry into a second magnetic stream, a second middling stream and a second non-magnetic stream. The second magnetic stream is also collected as product.
Description
~3i~5~
Process for concentratin~ mixed martite-hematite ore This invention relates to a process for concentrating a mixed martite/h~matite ~sing a magnetic separator.
Magnetic separation has long been known as a valuable technique in mineral separation and it has been particu-larly useful in the separation of strongly magnetic materials ~LOm non-magnetic materials~ Although the greatest commercial use of magnetic s~parators over the years has been found in dry separation processes, magnetic separators are also now successfully used under we'c conditions.
In the past/ magnetic separators have generall~ be~n in the form of an axially rotatable drum having disposed interiorly thereof a pïurality of fixed magnets. These ~agnets are normally placed in close proximity to the desired ~rea of the interior surface of the drum so that wh~n magnetic particle-carrying material is ed against the periphQral portion o the drum overlying the fix~d magnets, the magnetic particles adhere to the drum and are then carried to a discharge position. The non-magnetic material unaffected by the magnetic field normally is permitted to fall under the force of gravity for separate collection. When such equipment is employed for wet separating processes, a ~lurry or pulp of the material to be separated either is fed to the periphery of the drum in the same manner as dry material or, the rotating drum may be partially submerged in a liquid slurry.
More recently, for wet separation there has been developed the so-called wet high intensity magnetic separ-ator (WHIM Separator) and the most commercially successful of these is the so-called l'Jones Separator". A typical design of the Jones Separator is described in U.S. Patent No~ 3,326,374, issued June 20, 1967. It is of carousel type with a series of vertically oriented grooved plates mounted in an annular ring which rotate through alternat-ing magnetic fields. In this manner a magnetic field is introduced in the grooved plate sections as they pass a magnetic pole, then reach a point of zero magnetic field between the poles of opposite polarity and a high magnetic field at the next magnetic pole. A feed slurry îs fed into the grooved plates in the r~gion of a magnetic pole so that magnetic particles adhere to the plate walls. A
water flush is applied to help wash away the non-magnetic materials and then at a point of low or zero magnetic field the ma~netic particles are released from the plates with the assistance of high pressure water scouring.
Process for concentratin~ mixed martite-hematite ore This invention relates to a process for concentrating a mixed martite/h~matite ~sing a magnetic separator.
Magnetic separation has long been known as a valuable technique in mineral separation and it has been particu-larly useful in the separation of strongly magnetic materials ~LOm non-magnetic materials~ Although the greatest commercial use of magnetic s~parators over the years has been found in dry separation processes, magnetic separators are also now successfully used under we'c conditions.
In the past/ magnetic separators have generall~ be~n in the form of an axially rotatable drum having disposed interiorly thereof a pïurality of fixed magnets. These ~agnets are normally placed in close proximity to the desired ~rea of the interior surface of the drum so that wh~n magnetic particle-carrying material is ed against the periphQral portion o the drum overlying the fix~d magnets, the magnetic particles adhere to the drum and are then carried to a discharge position. The non-magnetic material unaffected by the magnetic field normally is permitted to fall under the force of gravity for separate collection. When such equipment is employed for wet separating processes, a ~lurry or pulp of the material to be separated either is fed to the periphery of the drum in the same manner as dry material or, the rotating drum may be partially submerged in a liquid slurry.
More recently, for wet separation there has been developed the so-called wet high intensity magnetic separ-ator (WHIM Separator) and the most commercially successful of these is the so-called l'Jones Separator". A typical design of the Jones Separator is described in U.S. Patent No~ 3,326,374, issued June 20, 1967. It is of carousel type with a series of vertically oriented grooved plates mounted in an annular ring which rotate through alternat-ing magnetic fields. In this manner a magnetic field is introduced in the grooved plate sections as they pass a magnetic pole, then reach a point of zero magnetic field between the poles of opposite polarity and a high magnetic field at the next magnetic pole. A feed slurry îs fed into the grooved plates in the r~gion of a magnetic pole so that magnetic particles adhere to the plate walls. A
water flush is applied to help wash away the non-magnetic materials and then at a point of low or zero magnetic field the ma~netic particles are released from the plates with the assistance of high pressure water scouring.
2~ The magnetic an~ non-magnetic particles are collected in separate launders. Magnetic pole pieces are usually provided on opposite sides of the grooved plate sections and, in order to obtain strong magnet;c fields, these are usually in the form of electromagnets.
The Jones Separator is quite widely ~lsed for producing iron ore concentrates. Additionally~ U.S. Patent 3,337,328 describes a process for pr~concentrat;ng low grade iron ores and U.S. Patent 4,192,738 describes a process for scavenging low grade tailings~
The Jones 5eparator develops a very strong magnetic field and is capable of separating materials of low intrin-sic magnetism. It has, however, been found that it is very difficult to separate magnetite on the Jones Separator because i~ retains magnetic charge and flocculates. This floc behaves in the manner of a gel and flows very slowly J~
between the grooved plates, thus yreatly reducing the capacity of the separator and sometime~ totally plugging the machine.
A common tailing produced from wet magnetic drum separators is a mixed martite/hematite product. The martite component is a weathered magnetite and, like magnitite, retains a magnetic charge and flocculates.
~owever, unlike regular magnetite, martite has too low magnetic susceptability to be recovered by the usual magnetic wet drum separatorsO Thus, because of their low magnetic susceptability they can be sep~xated only in a Jones Separator where the flocculation problem occurs.
It is, thereEore, the object of the present invention to provide an efficient method of concentrating a mixed martite~hematite ore product using a Jones Separator.
According to the present invention it has been found that a mixed martite/hematite ore can be concentrated by a process involving two magnetic s~paration stages using 3Ones Separators. A slurry of the mixed ore is first passed through a primary grooved-plate high intensity wet magnetic separator having plate gaps of 3 mm to 15 mm, groove widths 1 to 3 times the gap distance and a magnetic intensity of 2000 to 10000 gauss, thereby separating the slurry into a first magnetic stream, a first middling stream and a first non-magnetic stream. This first magnetic stream is collected as product and the first middling stream and first non-magnetic stream are combined to become a feed slurry through a secondary grooved plate high intensity wet magnetic separator having pla~e gaps of 1 mm to 3 mm, groove widths of less than about 4 mm and a magnetic intensity of about 5000 to 15000 gaussJ thereby again separating the slurry into a second magn~tic stream, a second middling stream and a second non magnetic stream.
The second magnetic stream is also collected as product.
It has surprisingly been found that by using the particular plate gap and groove widths for the primary ~ 3~
separator, efficient separation is achieved without floc-culation being detrimental to the flow capacity of the machineO For instance, it was found that utilizing a Jones Separator DP-317, having a nominal ca~acity for hematite of 120 tons per hour, that it was possible with a plate configuration of 4 grooves per inch and 5 mm gaps to eEfic-iently separate martite at a rate of 180 tons per hour.
For efficient separation of martite in the primary separator, the magnetic field in the gap shoul~ be in the range of 2000 to 10000 gauss. The selection of the gap size between the groove plates depends upon the quantity and magnetic susceptability of the martite to be separated and this normally varies between about 3 mm and 15 mm.
The gxoove width on the grooved plate matrix should be not greater than three times the gap and not smaller than the gap.
Also for efficient separation of the martite, the feed ~lurry should contain no more than 40% solids and prefer-ably no more than 35% solids. This is to reduce the viscosity due to magnetic flocculation and increase the ~low rate between the plates.
For feeding to the Jones Separator, ores are normally ground to a relatively small particle size, e.gO 140 mesh or finer (U.S~ Sieve~. It is possible to reduce the cost of grinding the ore by making a first pass through the sy~tem with the total tailings from a wet drum separator without reyrinding to liberation. This removes a large portion of low grade tailings and the magnet;c fractions obtained i~ the ~irst pass are then reground to liber-ation, e~g. -400 mesh, and subjected to a second pass through the system to produce a very high grade iron concentrate .
Having generally described the present invention, a more detailed illustration is given with reference to the following drawings in which:
Figure 1 is a plan view of a typical Jones Separator rotor;
Figure 2 is a perspective view of the rotor;
Fiyure 3 is a perspective view showing details of a plate box;
Figure 4 shows one groove plate configuration;
Figure 5 shows a second groove plate configuration; and Figure 6 is a preferred flow sheet according to the invention.
As will be seen from Figures 1, 2 and 3, the typical Jones Separator rotor 10 is mounted on a shaft 11 for rotation~ On opposite sides of the rotor are a pair of magnet yokes 12 around the arms of which are electro-magnetic coils 13.
Feed slurry is continslously fed in through feed inlets 14 and 14', middlings washes of low pressure wash water are continuously fed in through inlets lS and 15' and high pressure scouring water sprays are applied at 16 and 16' to dislodge the magnetic particles adhering to the plates.
The rotor 10 consists of a central portion 17 with plate boxes 18 around the peripheral. These plate boxes ~0 are divided by dividers 19 to which are connected outer plates 20. Packed into the plate boxes 18 are rows of grooved plates 21 with vertical spaces or gaps there-between through which the feed material passes.
As will be seen from Figures 4 and 5, the gap is the space between adjacent peaks 22 of the grooved plates 21.
The groove width is the distance between a pair of adjacent peaks 22.
A typical process sequence according to this invention is shown in the flow sheet of Figure 6. In this procedure a mixed martite/hematite iron ore product containing 35~
solids and having 48~ Fe was fed as an aqueous slurry at a rate of 180 tons per hour via inlet 30 in~o a Jones Separator 31. This was a model DP-335, having a ~ap of 5.0 mm and a groove width of 6.35 mm. The plate boxes were operated at a magnetic intensity of 3000 gaussO Wash water was added through line 32 at a rate of 100 cubic meters per hour and scouring water was injected through line 33 at a rate of 220 cubic meters per hour.
A first non-magnetic stream was drawn off through collector 34 and this contained 40.5~ FeO A middling stream was collected at collector 35 and combined with the non-magnetic stream 34. Meantime, a magnetic stream 36 was collected containing 65.1% Fe.
The combined non-magnets and middlings stream was fed to a dewatering system 38 together with a recycle stream 37. The dewatering system may be either a cyclone or a thickener and the concentrated product from the dewater system was fed to a second Jones Separator 41 via line 39O
This concentrated stream 39 contained 51% solids and 41.5 Fe. Meanwhile, a stream of water 40 was removed from the dewatering system 38 and used as recirculating system water.
The separator 41 is a Jones model DP 317 having a plate box gap of 2 mm and a groove width of 3O12 mm. The plate box was operated at a magnetic intensity of 10 t gauss.
A wash water was added through inlet 42 and scouring water was injected through inlet 43. A non-magnetics tailings was collected at 44 while a middlings stream 37 was collec-ted and recycled to the dewatering system 38 together with streams 34 and 35 rom separator 310 Finally a magnetics stream 45 was collected and combined with magnetic streams 36 as concentrate 46. This concentrate contained 65~ iron.
Example 1 A tailings was obtained from a magnetic wet drum separator in which the iron values were mixed martite/
hematite minerals. The hematite:martite ratio was about 5:4 and some geothite was present. Due to the martite content, i'satinagan" readings showed 4.8~ magnetite, but the content of true magnetite was less than 1~. Total iron content was approximately 61% Fe and the gangue con-sisted mainly of silica and alumina with traces of apatite.
This material had a particle size of -140 mesh was formed into a water slurry containing 35% solids and was fed to a system as described in Figure 6. First and second magnetic portions were obtained together with a non-magnetics tailings. The results obtained are shown in Table 1 below~
TABLE I
% Wt % FeFeDist %
Magnetic I
(Martite) 1st step 39~8 66.743.2 Magnetic II
(Hematite) 2nd step48.9 64.251.1 Non Magnetics 11.3 31.05~7 TOTAL lG0.0 61.4100.0 The total iron recovery was 93.3~ and this magnetic concentrate can easily be upgraded by a simple floatation process to form a super concentrate suitable for direct iron reduction processing.
ExamPle 2 An ore sample was obtained from U.S.S.R. and, after magnetic wet drum separation, a tailings was obtained where the iron values were mixed martite/hematite. The hematite:martite ratio was about 3:2 and some geothite was present. Due to the martite content, '~satinagan" readings showed 301% magnetitel but the true magnetite content was less than 1~ Total iron content was ap~roximately 36% Fe and the gangue was mainly silica and alumina with traces of silicates and apatite.
This tailings material, having a particle size of -200 mesh, without regrinding was fed through the system of Figure 6 and the results obtained were as in Table II
below.
TABLE II
_ % Wt % Fe FeDist %
Magnetic I
(Martite) 1st step 19.4 57.6 31.0 Magnetic II
(Hematite) 2nd step 32.3 54.4 48.6 Non-Magnetics (Tailings) 48.3 15.2 20.4 TOTAL 1.00~0 36.1 100.0 The magnetic portions I and II were combined and reground to -400 mesh. This material at a 35% solids water slurry was again fed through the system of Figure 6 10 and the results were as in Table III below.
TABLE III
% Wt % Fe FeDist %
Magnetic I
(Martite) 1st step 14.1 64.2 25.1 Magnetic II
(Hematite) 2nd step 23.1 63.4 40.6 Non-Magnetics (Tailings~ 14.5 34.6 13.9 TOTAL 51.7 55.6 79.6 This provided a total iron recovery of 65.7%.
The Jones Separator is quite widely ~lsed for producing iron ore concentrates. Additionally~ U.S. Patent 3,337,328 describes a process for pr~concentrat;ng low grade iron ores and U.S. Patent 4,192,738 describes a process for scavenging low grade tailings~
The Jones 5eparator develops a very strong magnetic field and is capable of separating materials of low intrin-sic magnetism. It has, however, been found that it is very difficult to separate magnetite on the Jones Separator because i~ retains magnetic charge and flocculates. This floc behaves in the manner of a gel and flows very slowly J~
between the grooved plates, thus yreatly reducing the capacity of the separator and sometime~ totally plugging the machine.
A common tailing produced from wet magnetic drum separators is a mixed martite/hematite product. The martite component is a weathered magnetite and, like magnitite, retains a magnetic charge and flocculates.
~owever, unlike regular magnetite, martite has too low magnetic susceptability to be recovered by the usual magnetic wet drum separatorsO Thus, because of their low magnetic susceptability they can be sep~xated only in a Jones Separator where the flocculation problem occurs.
It is, thereEore, the object of the present invention to provide an efficient method of concentrating a mixed martite~hematite ore product using a Jones Separator.
According to the present invention it has been found that a mixed martite/hematite ore can be concentrated by a process involving two magnetic s~paration stages using 3Ones Separators. A slurry of the mixed ore is first passed through a primary grooved-plate high intensity wet magnetic separator having plate gaps of 3 mm to 15 mm, groove widths 1 to 3 times the gap distance and a magnetic intensity of 2000 to 10000 gauss, thereby separating the slurry into a first magnetic stream, a first middling stream and a first non-magnetic stream. This first magnetic stream is collected as product and the first middling stream and first non-magnetic stream are combined to become a feed slurry through a secondary grooved plate high intensity wet magnetic separator having pla~e gaps of 1 mm to 3 mm, groove widths of less than about 4 mm and a magnetic intensity of about 5000 to 15000 gaussJ thereby again separating the slurry into a second magn~tic stream, a second middling stream and a second non magnetic stream.
The second magnetic stream is also collected as product.
It has surprisingly been found that by using the particular plate gap and groove widths for the primary ~ 3~
separator, efficient separation is achieved without floc-culation being detrimental to the flow capacity of the machineO For instance, it was found that utilizing a Jones Separator DP-317, having a nominal ca~acity for hematite of 120 tons per hour, that it was possible with a plate configuration of 4 grooves per inch and 5 mm gaps to eEfic-iently separate martite at a rate of 180 tons per hour.
For efficient separation of martite in the primary separator, the magnetic field in the gap shoul~ be in the range of 2000 to 10000 gauss. The selection of the gap size between the groove plates depends upon the quantity and magnetic susceptability of the martite to be separated and this normally varies between about 3 mm and 15 mm.
The gxoove width on the grooved plate matrix should be not greater than three times the gap and not smaller than the gap.
Also for efficient separation of the martite, the feed ~lurry should contain no more than 40% solids and prefer-ably no more than 35% solids. This is to reduce the viscosity due to magnetic flocculation and increase the ~low rate between the plates.
For feeding to the Jones Separator, ores are normally ground to a relatively small particle size, e.gO 140 mesh or finer (U.S~ Sieve~. It is possible to reduce the cost of grinding the ore by making a first pass through the sy~tem with the total tailings from a wet drum separator without reyrinding to liberation. This removes a large portion of low grade tailings and the magnet;c fractions obtained i~ the ~irst pass are then reground to liber-ation, e~g. -400 mesh, and subjected to a second pass through the system to produce a very high grade iron concentrate .
Having generally described the present invention, a more detailed illustration is given with reference to the following drawings in which:
Figure 1 is a plan view of a typical Jones Separator rotor;
Figure 2 is a perspective view of the rotor;
Fiyure 3 is a perspective view showing details of a plate box;
Figure 4 shows one groove plate configuration;
Figure 5 shows a second groove plate configuration; and Figure 6 is a preferred flow sheet according to the invention.
As will be seen from Figures 1, 2 and 3, the typical Jones Separator rotor 10 is mounted on a shaft 11 for rotation~ On opposite sides of the rotor are a pair of magnet yokes 12 around the arms of which are electro-magnetic coils 13.
Feed slurry is continslously fed in through feed inlets 14 and 14', middlings washes of low pressure wash water are continuously fed in through inlets lS and 15' and high pressure scouring water sprays are applied at 16 and 16' to dislodge the magnetic particles adhering to the plates.
The rotor 10 consists of a central portion 17 with plate boxes 18 around the peripheral. These plate boxes ~0 are divided by dividers 19 to which are connected outer plates 20. Packed into the plate boxes 18 are rows of grooved plates 21 with vertical spaces or gaps there-between through which the feed material passes.
As will be seen from Figures 4 and 5, the gap is the space between adjacent peaks 22 of the grooved plates 21.
The groove width is the distance between a pair of adjacent peaks 22.
A typical process sequence according to this invention is shown in the flow sheet of Figure 6. In this procedure a mixed martite/hematite iron ore product containing 35~
solids and having 48~ Fe was fed as an aqueous slurry at a rate of 180 tons per hour via inlet 30 in~o a Jones Separator 31. This was a model DP-335, having a ~ap of 5.0 mm and a groove width of 6.35 mm. The plate boxes were operated at a magnetic intensity of 3000 gaussO Wash water was added through line 32 at a rate of 100 cubic meters per hour and scouring water was injected through line 33 at a rate of 220 cubic meters per hour.
A first non-magnetic stream was drawn off through collector 34 and this contained 40.5~ FeO A middling stream was collected at collector 35 and combined with the non-magnetic stream 34. Meantime, a magnetic stream 36 was collected containing 65.1% Fe.
The combined non-magnets and middlings stream was fed to a dewatering system 38 together with a recycle stream 37. The dewatering system may be either a cyclone or a thickener and the concentrated product from the dewater system was fed to a second Jones Separator 41 via line 39O
This concentrated stream 39 contained 51% solids and 41.5 Fe. Meanwhile, a stream of water 40 was removed from the dewatering system 38 and used as recirculating system water.
The separator 41 is a Jones model DP 317 having a plate box gap of 2 mm and a groove width of 3O12 mm. The plate box was operated at a magnetic intensity of 10 t gauss.
A wash water was added through inlet 42 and scouring water was injected through inlet 43. A non-magnetics tailings was collected at 44 while a middlings stream 37 was collec-ted and recycled to the dewatering system 38 together with streams 34 and 35 rom separator 310 Finally a magnetics stream 45 was collected and combined with magnetic streams 36 as concentrate 46. This concentrate contained 65~ iron.
Example 1 A tailings was obtained from a magnetic wet drum separator in which the iron values were mixed martite/
hematite minerals. The hematite:martite ratio was about 5:4 and some geothite was present. Due to the martite content, i'satinagan" readings showed 4.8~ magnetite, but the content of true magnetite was less than 1~. Total iron content was approximately 61% Fe and the gangue con-sisted mainly of silica and alumina with traces of apatite.
This material had a particle size of -140 mesh was formed into a water slurry containing 35% solids and was fed to a system as described in Figure 6. First and second magnetic portions were obtained together with a non-magnetics tailings. The results obtained are shown in Table 1 below~
TABLE I
% Wt % FeFeDist %
Magnetic I
(Martite) 1st step 39~8 66.743.2 Magnetic II
(Hematite) 2nd step48.9 64.251.1 Non Magnetics 11.3 31.05~7 TOTAL lG0.0 61.4100.0 The total iron recovery was 93.3~ and this magnetic concentrate can easily be upgraded by a simple floatation process to form a super concentrate suitable for direct iron reduction processing.
ExamPle 2 An ore sample was obtained from U.S.S.R. and, after magnetic wet drum separation, a tailings was obtained where the iron values were mixed martite/hematite. The hematite:martite ratio was about 3:2 and some geothite was present. Due to the martite content, '~satinagan" readings showed 301% magnetitel but the true magnetite content was less than 1~ Total iron content was ap~roximately 36% Fe and the gangue was mainly silica and alumina with traces of silicates and apatite.
This tailings material, having a particle size of -200 mesh, without regrinding was fed through the system of Figure 6 and the results obtained were as in Table II
below.
TABLE II
_ % Wt % Fe FeDist %
Magnetic I
(Martite) 1st step 19.4 57.6 31.0 Magnetic II
(Hematite) 2nd step 32.3 54.4 48.6 Non-Magnetics (Tailings) 48.3 15.2 20.4 TOTAL 1.00~0 36.1 100.0 The magnetic portions I and II were combined and reground to -400 mesh. This material at a 35% solids water slurry was again fed through the system of Figure 6 10 and the results were as in Table III below.
TABLE III
% Wt % Fe FeDist %
Magnetic I
(Martite) 1st step 14.1 64.2 25.1 Magnetic II
(Hematite) 2nd step 23.1 63.4 40.6 Non-Magnetics (Tailings~ 14.5 34.6 13.9 TOTAL 51.7 55.6 79.6 This provided a total iron recovery of 65.7%.
Claims (5)
1. A process for concentrating a mixed martite/hematite iron ore product which comprises:
(a) passing a feed slurry of a mixed martite/hematite ore through a first grooved-plate high intensity wet magnetic separator having plate gaps of 3 mm to 15 mm, groove widths one to three times the gap distance and a magnetic intensity of 2000 to 10000 gauss, thereby separating the slurry into a first magnetics stream, a first middlings stream and a first non-magnetic stream, (b) collecting said first magnetics stream as product, (c) passing said first middlings stream and first non-magnetics stream as second feed slurry through a second grooved-plate high intensity wet magnetic separator having plate gaps of 1 mm to 3 mm, groove widths of less than about 4 mm and a magnetic intensity of about 5000 to 15000 gauss, thereby separating the slurry into a second mag-netics stream, a second middlings stream and a second non-magnetics stream, and (d) collecting said second magnetics stream as product.
(a) passing a feed slurry of a mixed martite/hematite ore through a first grooved-plate high intensity wet magnetic separator having plate gaps of 3 mm to 15 mm, groove widths one to three times the gap distance and a magnetic intensity of 2000 to 10000 gauss, thereby separating the slurry into a first magnetics stream, a first middlings stream and a first non-magnetic stream, (b) collecting said first magnetics stream as product, (c) passing said first middlings stream and first non-magnetics stream as second feed slurry through a second grooved-plate high intensity wet magnetic separator having plate gaps of 1 mm to 3 mm, groove widths of less than about 4 mm and a magnetic intensity of about 5000 to 15000 gauss, thereby separating the slurry into a second mag-netics stream, a second middlings stream and a second non-magnetics stream, and (d) collecting said second magnetics stream as product.
2. A process according to claim 1 wherein the first feed slurry contains up to 40% solids.
3. A process according to claim 2 wherein the first feed slurry contains less than 35% solids.
4. A process according to claim 3 wherein the ore solids in the first feed slurry have particle sizes of less than 140 mesh.
5. A process according to claim 4 wherein the second feed slurry was reground to a particle size of less than 400 mesh before passing through the second separator.
9.
9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000435236A CA1213858A (en) | 1983-08-24 | 1983-08-24 | Process for concentrating mixed martite-hematite ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000435236A CA1213858A (en) | 1983-08-24 | 1983-08-24 | Process for concentrating mixed martite-hematite ore |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1213858A true CA1213858A (en) | 1986-11-12 |
Family
ID=4125934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000435236A Expired CA1213858A (en) | 1983-08-24 | 1983-08-24 | Process for concentrating mixed martite-hematite ore |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1213858A (en) |
-
1983
- 1983-08-24 CA CA000435236A patent/CA1213858A/en not_active Expired
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