CA1204413A - Flush mounting unencumbered tongue-adjust undercut device for spiral separators - Google Patents
Flush mounting unencumbered tongue-adjust undercut device for spiral separatorsInfo
- Publication number
- CA1204413A CA1204413A CA000414526A CA414526A CA1204413A CA 1204413 A CA1204413 A CA 1204413A CA 000414526 A CA000414526 A CA 000414526A CA 414526 A CA414526 A CA 414526A CA 1204413 A CA1204413 A CA 1204413A
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- CA
- Canada
- Prior art keywords
- tongue
- take
- assembly
- undercut
- pulp
- 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
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Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to a take-off assembly for mounting in a spiral separator. The take-off assembly includes an adjustment tongue and a mounting member con-taining a transverse aperture for receiving the adjustment tongue. The mounting member has a surface surrounding the adjustment tongue which is substantially flush with the top surface of the adjustment tongue. There is also pro-vided an undercut for obtaining an undercut of concentrates particles from pulp flowing in the spiral separator whereby tailings and/or middlings contained in an upper portion of the pulp above the concentrates particles may flow across the transverse aperture.
There is also provided a spiral separator for gravity separation of minerals containing the take-off assembly and a method of taking undercuts including using the above-mentioned take-off assembly in the spiral separator.
This invention relates to a take-off assembly for mounting in a spiral separator. The take-off assembly includes an adjustment tongue and a mounting member con-taining a transverse aperture for receiving the adjustment tongue. The mounting member has a surface surrounding the adjustment tongue which is substantially flush with the top surface of the adjustment tongue. There is also pro-vided an undercut for obtaining an undercut of concentrates particles from pulp flowing in the spiral separator whereby tailings and/or middlings contained in an upper portion of the pulp above the concentrates particles may flow across the transverse aperture.
There is also provided a spiral separator for gravity separation of minerals containing the take-off assembly and a method of taking undercuts including using the above-mentioned take-off assembly in the spiral separator.
Description
``` 9~0~4~3 THIS INVENTION relates to a take-off assembly suitable for mounting in a spiral separator. The take-off assembly is primarily adapted to separate particles of different density contained in a pulp of water and particles fed to the spiral separator. The spiral separator treats the pulp so as to isolate the valuable mineral particles therefrom by a process of gravitational separation.
U.S. Patent Specification 4, 189,378 describes a spiral separator having a takeoff assembly wherein the take-off assembly includes a slot in the bottom portion of the spiral separator which is oriented in a direction trays-verse to ye flow of pulp. A tongue is slid ably mounted in the slow whereby the tongue may be advanced or retracted in to vary the clearance between an inner end of the slot and a proximal end of the tongue.
Disadvantages associated with the arrangement described above have been found to exist in relation to efficient separation of middlings (to particles of density which is intermediate that of the mineral rich concentrates and the tailings) from the concentrates. Thus the separation of middlings from concentrates was found to be relatively unsatisfactory because of the difficulty in obtaining under-cuts of concentrates from the pulp. If such undercuts could not be carried out efficiently the concentrates tended to combine with the overlying silica particles in flowing across the slot to combine with the remainder of the tailings.
It is therefore an object of the present invention to provide a take-off assembly which alleviates the problem referred to above.
The invention in one aspect therefore provides a take-off assembly suitable for use in a spiral separator including a throat gap adjustment member mounting member containing a transverse slot or aperture for receiving the throat gap adjustment member; and means for obtaining an 44~3 undercut ox concentrate particles from pulp Ted to the spiral separator whereby tailings Andre middlings contained in an upper portion ox the pulp above the concentrate particles may slow across the transverse slot or aperture.
Preferably the throat gap adjustment member is elongate and is a tongue which is slid ably mounted in the mounting member which also may be elongate. The mounting member is suitably plate-like having a centrally located slot of complementary shape to that of the tongue. The slot and tongue are suitably rectangular having a pair ox opposed side portions and a pair of opposed end portions. The centrally located slot may also be provided with mounting grooves or ribs in the side portions thereof for mounting of the tongue which may be provided with ribs or grooves of complementary shape to that of the slot.
The undercut means described above in one form may comprise one or more peripheral notches or slots in the side portion(s) or end portions) of the tongue. Preferably however the undercut means is a single peripheral notch or slot located in a side portion of the tongue adjacent an end portion thereof which is proximal to an inner end of the transverse slot.
In another Norm the undercut means may comprise the tongue being formed into two or even three components which are all slid ably attached to each other. Selective movement of one component relative to the other components) may provide an undercut slot or aperture for achieving an undercut of concentrates which concentrates may have a top layer of middlings and/or tailings and thereby allow the top layer of middlings Andre tailings to flow across the takeoff assembly so that they may be separated from the concentrates.
It will be noted in U.S. Patent 4 189 378 that there is disclosed therein tongue comprising a centrally located slot (numbered 27 in the drawings) in which there is engaged an adjustable slide (number 28 in *he drawings). The ox tongue of Patent 4 189 378 however is provided with an upright splitter blade (number 24 in the drawings) and it has now been found that such splitter blade is detrimental to efficient taking of undercuts from the pulp because it has a tendency to cause the pulp to be diverted from flowing across the region of the transverse slot where an undercut is required to be taken.
An additional problem with reference to U.S. Patent 4 189 378 was that the tongue described therein was bridled by the splitter blade and thus efficient taking of undercuts was not possible because of the presence of the bridging splitter blade. Thus it was not possible to readily calculate a desired setting of the tongue relative to the inner end of the slot so that undercuts could be taken at the most appropriate location.
A still further problem with U.S. Patent 4 189 378 was that often the concentrate particles located below the overlying tailings or silica had a tendency to "jump" the transverse slow and thus end up with the tailings or silica and thus undercuts could not be satisfactorily carried out.
Yet another problem with U.S. Patent 4 189 378 was that the leading end or upstream portion of the splitter blade caused a build up of "trash" and thus sand-barring of pulp would occur within the region of the leading end or upstream portion of the splitter blade.
Thus in relation to the present invention it is a necessary limitation for the effective taking of undercuts that a top surface of the tongue is substantially flush with the top surface or surrounding surface of the mounting member.
The invention also includes within its scope a spiral separator incorporating the above mentioned take-off assembly.
~20~3 It is also within the scope of the invention that the mounting member be omitted end the transverse slot or aperture be formed in the bottom wall of the continuous helical trough worming the spiral separator, In this embodiment the tongue may by mounted directly in the slot or aperture.
The invention may also include within its scope a method of taking undercuts including the steps of;
(i) feeding a pulp of mineral particles and water to a top part of a spiral separator comprising a continuous helical trough wherein acid trough includes a take-off assembly as herein before - descried; and it taking an undercut of concentrate particles from said pulp as said pup flows across the take-off assembly to separate said concentrate particles from an overlying layer of tailings and/or middlings which may flow past the take-off assembly with the pulp.
Reference may now be made to preferred embodiment of the invention as Shannon the accompanying drawings wherein:
FIG 1 illustrates a perspective view of a spiral separator constructed in accordance with the invention;
FIX 2 illustrates a top plan view of a take-off assembly for use with the spiral separator of FIG l;
FIG 3 illustrates an end view of the take-off assembly shown in FIG 2;
FIG 4 illustrates a modified form of take-off assembly to that shown in FIG 2;
FIG 5 illustrates an end view of the take-off assembly shown in FIG 4, and FIG 6 illustrates a perspective view of a spiral separator incorporating the take-off assembly shown in FIG 4 The spiral separator shown on the drawings includes a Cantonese helical trough 10 having an upright column 11.
12C)4413 There is provided in tough 10 a takeoff assembly 12 having a tongue 13 slid ably mounted in a transverse slot 14 pro-voided in a mounting plate 15, Mounting plate 15 may be fixedly mounted in an accommodating slot 16 in trough 10 by S use ox adhesive if desired, Alternatively mounting plate 15 may be releasable mounted in slot 16~ Tongue 13 includes three components which are end components 17 and 18 and intermediate component 19. End components 17 and 18 include mounting ribs 20 slid ably engagable in corresponding grooves 21 provided in mounting plate 15, Component 19 includes side ribs 22 slid ably mounted in matins grooves 23 of components 17 and 18.
In operation of the takeoff assembly 12 component 19 of tongue 13 is retracted with respect to component 17 and 18 as shown to provide a gap 24 between components 17 and 18.
There is also shown aperture 25 provided by partial withdrawal of tongue 13 from abutting inner end 26 of slot 14. Gap 24 allows for an undercut of pulp to be taken as pulp flows across slot 14~ Aperture 25 allows for the taking of a side cut of high grade concentrate particles. The undercut taken through gap 24 is of high grade concentrate particles and allows for silica overlying the undercut to flow across slot 14 and be combined with the tailings.
The setting of component 17 in slot 14 may be deter-mined experimentally so as to obtain the most efficient recov-cry of mineral concentrate taken through aperture 25~ In some cases component 19 may be retracted so as to have the same setting of component 17 depending upon the depth of the mineral concentrate being recovered and/or the velocity of pulp.
I The undercut and side cut of high grade concentrate that may be taken may be collected in conduit AYE for transfer to hollow column 11. There also may be provided middlings conduit 27 if desired. However conduit 27 may be dispensed with if required The modified take-off assembly AYE shown in FIG 4 4~3 includes mounting plate 15~ and tongue AYE slid ably mounted therein Tongue AYE includes ribs: 28 for engagement with accommodating grooves I folded in plate AYE. Tongue AYE
may include peripheral notch 30~ Tongue AYE is also partially retracted from inner end 26B of mounting plate 15 to provide clearance for aperture 32 which has the same function of aperture 25 described previously. Notch 30 has the same fungi-ion as gap 24 described previously The spiral separator shown in FIG 4 has like reference numerals as described above in relation to FIG 1 and suitably accommodates take-off assembly AYE as shown.
The number of takeoff assemblies that may be mounted in a single separator are dependent on the type of pulp being processed, the speed of flow of the pulp and its depth.
If there is heavy mineral content in the feed then several take-off assemblies may be required.
Usually the concentrate particles separate out into a visible concentrate band and an invisible concentrate band which may have overlying layer of silica particles.
The invisible concentrate band when taken as undercuts as described above considerably improves the efficiency of separation and collection of concentrates Andre middlings from the pulp as described above.
It is also within the scope of the invention that instead of adjustment tongue 13 or AYE being slid ably mounted in slot 16 or slot 14 that adjustment tongue 13 or AYE be fixedly mounted (erg. by use of adhesive) in its mating slot after suitable experimentation has taken place so as to provide the most appropriate setting for obtaining maximum recovery of concentrates If desired intermediate component 19 may be fixedly attached to components 17 and 18 after an appropriate setting has been determined
U.S. Patent Specification 4, 189,378 describes a spiral separator having a takeoff assembly wherein the take-off assembly includes a slot in the bottom portion of the spiral separator which is oriented in a direction trays-verse to ye flow of pulp. A tongue is slid ably mounted in the slow whereby the tongue may be advanced or retracted in to vary the clearance between an inner end of the slot and a proximal end of the tongue.
Disadvantages associated with the arrangement described above have been found to exist in relation to efficient separation of middlings (to particles of density which is intermediate that of the mineral rich concentrates and the tailings) from the concentrates. Thus the separation of middlings from concentrates was found to be relatively unsatisfactory because of the difficulty in obtaining under-cuts of concentrates from the pulp. If such undercuts could not be carried out efficiently the concentrates tended to combine with the overlying silica particles in flowing across the slot to combine with the remainder of the tailings.
It is therefore an object of the present invention to provide a take-off assembly which alleviates the problem referred to above.
The invention in one aspect therefore provides a take-off assembly suitable for use in a spiral separator including a throat gap adjustment member mounting member containing a transverse slot or aperture for receiving the throat gap adjustment member; and means for obtaining an 44~3 undercut ox concentrate particles from pulp Ted to the spiral separator whereby tailings Andre middlings contained in an upper portion ox the pulp above the concentrate particles may slow across the transverse slot or aperture.
Preferably the throat gap adjustment member is elongate and is a tongue which is slid ably mounted in the mounting member which also may be elongate. The mounting member is suitably plate-like having a centrally located slot of complementary shape to that of the tongue. The slot and tongue are suitably rectangular having a pair ox opposed side portions and a pair of opposed end portions. The centrally located slot may also be provided with mounting grooves or ribs in the side portions thereof for mounting of the tongue which may be provided with ribs or grooves of complementary shape to that of the slot.
The undercut means described above in one form may comprise one or more peripheral notches or slots in the side portion(s) or end portions) of the tongue. Preferably however the undercut means is a single peripheral notch or slot located in a side portion of the tongue adjacent an end portion thereof which is proximal to an inner end of the transverse slot.
In another Norm the undercut means may comprise the tongue being formed into two or even three components which are all slid ably attached to each other. Selective movement of one component relative to the other components) may provide an undercut slot or aperture for achieving an undercut of concentrates which concentrates may have a top layer of middlings and/or tailings and thereby allow the top layer of middlings Andre tailings to flow across the takeoff assembly so that they may be separated from the concentrates.
It will be noted in U.S. Patent 4 189 378 that there is disclosed therein tongue comprising a centrally located slot (numbered 27 in the drawings) in which there is engaged an adjustable slide (number 28 in *he drawings). The ox tongue of Patent 4 189 378 however is provided with an upright splitter blade (number 24 in the drawings) and it has now been found that such splitter blade is detrimental to efficient taking of undercuts from the pulp because it has a tendency to cause the pulp to be diverted from flowing across the region of the transverse slot where an undercut is required to be taken.
An additional problem with reference to U.S. Patent 4 189 378 was that the tongue described therein was bridled by the splitter blade and thus efficient taking of undercuts was not possible because of the presence of the bridging splitter blade. Thus it was not possible to readily calculate a desired setting of the tongue relative to the inner end of the slot so that undercuts could be taken at the most appropriate location.
A still further problem with U.S. Patent 4 189 378 was that often the concentrate particles located below the overlying tailings or silica had a tendency to "jump" the transverse slow and thus end up with the tailings or silica and thus undercuts could not be satisfactorily carried out.
Yet another problem with U.S. Patent 4 189 378 was that the leading end or upstream portion of the splitter blade caused a build up of "trash" and thus sand-barring of pulp would occur within the region of the leading end or upstream portion of the splitter blade.
Thus in relation to the present invention it is a necessary limitation for the effective taking of undercuts that a top surface of the tongue is substantially flush with the top surface or surrounding surface of the mounting member.
The invention also includes within its scope a spiral separator incorporating the above mentioned take-off assembly.
~20~3 It is also within the scope of the invention that the mounting member be omitted end the transverse slot or aperture be formed in the bottom wall of the continuous helical trough worming the spiral separator, In this embodiment the tongue may by mounted directly in the slot or aperture.
The invention may also include within its scope a method of taking undercuts including the steps of;
(i) feeding a pulp of mineral particles and water to a top part of a spiral separator comprising a continuous helical trough wherein acid trough includes a take-off assembly as herein before - descried; and it taking an undercut of concentrate particles from said pulp as said pup flows across the take-off assembly to separate said concentrate particles from an overlying layer of tailings and/or middlings which may flow past the take-off assembly with the pulp.
Reference may now be made to preferred embodiment of the invention as Shannon the accompanying drawings wherein:
FIG 1 illustrates a perspective view of a spiral separator constructed in accordance with the invention;
FIX 2 illustrates a top plan view of a take-off assembly for use with the spiral separator of FIG l;
FIG 3 illustrates an end view of the take-off assembly shown in FIG 2;
FIG 4 illustrates a modified form of take-off assembly to that shown in FIG 2;
FIG 5 illustrates an end view of the take-off assembly shown in FIG 4, and FIG 6 illustrates a perspective view of a spiral separator incorporating the take-off assembly shown in FIG 4 The spiral separator shown on the drawings includes a Cantonese helical trough 10 having an upright column 11.
12C)4413 There is provided in tough 10 a takeoff assembly 12 having a tongue 13 slid ably mounted in a transverse slot 14 pro-voided in a mounting plate 15, Mounting plate 15 may be fixedly mounted in an accommodating slot 16 in trough 10 by S use ox adhesive if desired, Alternatively mounting plate 15 may be releasable mounted in slot 16~ Tongue 13 includes three components which are end components 17 and 18 and intermediate component 19. End components 17 and 18 include mounting ribs 20 slid ably engagable in corresponding grooves 21 provided in mounting plate 15, Component 19 includes side ribs 22 slid ably mounted in matins grooves 23 of components 17 and 18.
In operation of the takeoff assembly 12 component 19 of tongue 13 is retracted with respect to component 17 and 18 as shown to provide a gap 24 between components 17 and 18.
There is also shown aperture 25 provided by partial withdrawal of tongue 13 from abutting inner end 26 of slot 14. Gap 24 allows for an undercut of pulp to be taken as pulp flows across slot 14~ Aperture 25 allows for the taking of a side cut of high grade concentrate particles. The undercut taken through gap 24 is of high grade concentrate particles and allows for silica overlying the undercut to flow across slot 14 and be combined with the tailings.
The setting of component 17 in slot 14 may be deter-mined experimentally so as to obtain the most efficient recov-cry of mineral concentrate taken through aperture 25~ In some cases component 19 may be retracted so as to have the same setting of component 17 depending upon the depth of the mineral concentrate being recovered and/or the velocity of pulp.
I The undercut and side cut of high grade concentrate that may be taken may be collected in conduit AYE for transfer to hollow column 11. There also may be provided middlings conduit 27 if desired. However conduit 27 may be dispensed with if required The modified take-off assembly AYE shown in FIG 4 4~3 includes mounting plate 15~ and tongue AYE slid ably mounted therein Tongue AYE includes ribs: 28 for engagement with accommodating grooves I folded in plate AYE. Tongue AYE
may include peripheral notch 30~ Tongue AYE is also partially retracted from inner end 26B of mounting plate 15 to provide clearance for aperture 32 which has the same function of aperture 25 described previously. Notch 30 has the same fungi-ion as gap 24 described previously The spiral separator shown in FIG 4 has like reference numerals as described above in relation to FIG 1 and suitably accommodates take-off assembly AYE as shown.
The number of takeoff assemblies that may be mounted in a single separator are dependent on the type of pulp being processed, the speed of flow of the pulp and its depth.
If there is heavy mineral content in the feed then several take-off assemblies may be required.
Usually the concentrate particles separate out into a visible concentrate band and an invisible concentrate band which may have overlying layer of silica particles.
The invisible concentrate band when taken as undercuts as described above considerably improves the efficiency of separation and collection of concentrates Andre middlings from the pulp as described above.
It is also within the scope of the invention that instead of adjustment tongue 13 or AYE being slid ably mounted in slot 16 or slot 14 that adjustment tongue 13 or AYE be fixedly mounted (erg. by use of adhesive) in its mating slot after suitable experimentation has taken place so as to provide the most appropriate setting for obtaining maximum recovery of concentrates If desired intermediate component 19 may be fixedly attached to components 17 and 18 after an appropriate setting has been determined
Claims (11)
PROPERTY OR PRIVILEVE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A take-off assembly for mounting in a spiral separator including:
(i) an unencumbered adjustment tongue;
(ii) a mounting member containing a transverse aperture for receiving the adjustment tongue wherein said mounting member has a surface surrounding the adjustment tongue which is substantially flush with a top surface of the adjustment tongue; and (iii) undercut means for obtaining an undercut of concentrates particles from pulp flowing in the spiral separator in use whereby tailings and/or middlings contained in an upper portion of the pulp above the concentrate particles may flow across the transverse slot or aperture.
(i) an unencumbered adjustment tongue;
(ii) a mounting member containing a transverse aperture for receiving the adjustment tongue wherein said mounting member has a surface surrounding the adjustment tongue which is substantially flush with a top surface of the adjustment tongue; and (iii) undercut means for obtaining an undercut of concentrates particles from pulp flowing in the spiral separator in use whereby tailings and/or middlings contained in an upper portion of the pulp above the concentrate particles may flow across the transverse slot or aperture.
2. A take-off assembly as claimed in claim 1 wherein the undercut means includes a peripheral notch or slot located in the adjustment tongue adjacent an inner end of said adjust-ment tongue.
3. A take-off assembly as claimed in claim 1 wherein the undercut means includes a gap provided between opposed portions of said adjustment tongue.
4. A take-off assembly as claimed in claim 3 wherein the adjustment tongue includes opposed end components and an intermediate component interposed therebetween wherein relative movement may occur between the opposed end components and the intermediate component so as to provide said gap.
5. A spiral separator for gravity separation of minerals including:
(1) a continuous helical trough containing a take-off assembly including a transverse aperture and an unencumbered adjustment tongue mounted in said aper-ture wherein a top surface of the adjustment tongue is substantially flush with the surrounding surface of the helical trough; and (ii) undercut means is provided associated with said take-off assembly for taking an undercut of concentrate particles from pulp flowing across the slot or aperture whereby in use tailings and/or middlings contained in an upper portion of the pulp above the concentrate particles may flow across the transverse slot or aperture.
(1) a continuous helical trough containing a take-off assembly including a transverse aperture and an unencumbered adjustment tongue mounted in said aper-ture wherein a top surface of the adjustment tongue is substantially flush with the surrounding surface of the helical trough; and (ii) undercut means is provided associated with said take-off assembly for taking an undercut of concentrate particles from pulp flowing across the slot or aperture whereby in use tailings and/or middlings contained in an upper portion of the pulp above the concentrate particles may flow across the transverse slot or aperture.
6. A spiral separator as claimed in claim 5 wherein said take-off assembly further includes a mounting member for said throat gap adjustment member or tongue wherein a top surface of said mounting member is substantially flush with the top surface of the adjustment tongue.
7. A spiral separator as claimed in claim 6 wherein said undercut means includes a peripheral notch or slot located in the adjustmenttongueadjacent an inner end of said adjustment tongue.
8. A spiral separator as claimed in claim 6 wherein said undercut means includes a gap provided between opposed portions of said adjustment tongue.
9. A method of taking undercuts including the steps of:
(i) feeding a pulp of mineral particles and water to a top part of a spiral separator containing a take-off assembly, said spiral separator being as defined in claim 5;
(ii) taking an undercut of concentrate particles from said pulp as said pulp flows across the take-off assembly to separate said concentrate particles from an overlying layer of tailings and/or middlings which may flow across the take-off assembly with the pulp.
(i) feeding a pulp of mineral particles and water to a top part of a spiral separator containing a take-off assembly, said spiral separator being as defined in claim 5;
(ii) taking an undercut of concentrate particles from said pulp as said pulp flows across the take-off assembly to separate said concentrate particles from an overlying layer of tailings and/or middlings which may flow across the take-off assembly with the pulp.
10. A method as claimed in claim 9 wherein step (ii) is accomplished by setting the adjustment tongue of said take-off assembly to provide an aperture for taking a side cut of concentrate particles and there is further provided in the adjustment tongue a peripheral notch for taking said undercut of concentrate particles.
11. A method as claimed in claim 9 wherein step (ii) is accomplished by setting the adjustment tongue of said take-off assembly to provide an aperture for taking a side cut of concentrate particles and there is also provided an under-cut aperture between opposed portions of the adjustment tongue for taking said undercut of concentrate particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000414526A CA1204413A (en) | 1982-10-29 | 1982-10-29 | Flush mounting unencumbered tongue-adjust undercut device for spiral separators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000414526A CA1204413A (en) | 1982-10-29 | 1982-10-29 | Flush mounting unencumbered tongue-adjust undercut device for spiral separators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1204413A true CA1204413A (en) | 1986-05-13 |
Family
ID=4123848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000414526A Expired CA1204413A (en) | 1982-10-29 | 1982-10-29 | Flush mounting unencumbered tongue-adjust undercut device for spiral separators |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1204413A (en) |
-
1982
- 1982-10-29 CA CA000414526A patent/CA1204413A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |