CA1053951A - Feed box for liquid-solid mixtures - Google Patents
Feed box for liquid-solid mixturesInfo
- Publication number
- CA1053951A CA1053951A CA270,999A CA270999A CA1053951A CA 1053951 A CA1053951 A CA 1053951A CA 270999 A CA270999 A CA 270999A CA 1053951 A CA1053951 A CA 1053951A
- Authority
- CA
- Canada
- Prior art keywords
- feed
- incline
- box
- arcuate
- sludge
- 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
- 239000008247 solid mixture Substances 0.000 title 1
- 239000002002 slurry Substances 0.000 claims abstract description 11
- 239000010802 sludge Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 6
- 239000011344 liquid material Substances 0.000 claims 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000011132 calcium sulphate Nutrition 0.000 description 1
- 239000001175 calcium sulphate Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention consists of a device called a feed, or wash box for use where it is necessary to feed a relatively large volume of slurry or liquor on to a moving surface uniformly and without excessive local velocity or turbulence, the device being characterized by the fact that it takes advantage of the moving slurry or liquor to receive it on an inclined plane, causing it to develop some velocity as it passes down the plane and spreads out, and at the end of the incline, causes it suddenly to change direction of flow by about 90° and again by impact on another guide surface to change direction of flow by about 180°, to be fed on to a final surface, which may be a filter belt or other receiving surface.
The invention consists of a device called a feed, or wash box for use where it is necessary to feed a relatively large volume of slurry or liquor on to a moving surface uniformly and without excessive local velocity or turbulence, the device being characterized by the fact that it takes advantage of the moving slurry or liquor to receive it on an inclined plane, causing it to develop some velocity as it passes down the plane and spreads out, and at the end of the incline, causes it suddenly to change direction of flow by about 90° and again by impact on another guide surface to change direction of flow by about 180°, to be fed on to a final surface, which may be a filter belt or other receiving surface.
Description
3~S~
The presen-t invention relates to the handling of slurries or sludges, and more particularly to a feed box suitable for use in the separa-tion of a product from its medium in which it occurs or is ~ormed. Such separation usually involves a filtration operation. It may also be useful in certain drying and flaking operations and also it may be useful as a travel-ing device to spread a uniform layer on a surface, for example cement or concrete from a traveling machine.
When using a wash box on a traveling belt filter the liquor must be uniformly spread over the filter cake without stirring up or disturbing the cake.
A characteristic process to which the present invention is applicable is the formation of phosphoric acid by any traditional or wet method whether it be in the hemihydrate mode or the gypsum mode. The final aqueous medium will be a mixture of phosphoric acid with calcium sulphate, which is required to be filtered. This mobile solid-liquid mixture is passed to a filtration device and in a preferred type of operation to a moving belt filter. In this latter manoeuvre where the final filtration is on a moving bel~ and the washing occurs in stages along the belt, reasonably uniform dis-tribution of slurry over the belt is most essential.
In a quite different kind of operation, movement of cellulose -aqueous pulp in paper making machinery is necessary, for example, from a head box into a paper-forming machine. This involves again a solid liquid slurry, whose handling is aided if it can be distributed uniformly across the section of the machine in which the movement is occurring.
In a related kind o operation, pouring of concrete involves an aqueous sludge, genera~ly quite high in solid content, but, nevertheless, in pouring concrete -for extended surfaces, a pour which gives a reasonable uni-form distribution over a surface is most useful.
It is accordingly a basic objec~ o~ this invention to provide a device suitable for use in applications, wherein a solid-liquid sludge or 3~
slurry is being handled, so that the sludge can bc fed into the device and spread relatively uniformly over a receiving surface as it makes its exit from the device.
According to the present invention there is provided a sludge, slurry or liquid mater;al feeding device comprising a hecad box with inLet ` means for said material, sides and bottom to guide said material, an o en end to direct said feed to a point of disposition, means to hold the box bottom at an incline o ~etween 22-1~2 and 60 to the horizontal~ such that the material flows from said inlet down said incline to develop some ve:locityJ
means terminating the bottom of the box transversely at the end o the incline in an upwardly directed arcuate lip, terminated about 90 to the direction o 10w o said material, and immediately upon termination of said arcuate lip arcuate means again reversing the direction 90 to form tangential arcs, arcuate means acing said tangential arcs to intercept and reverse the flow of material directed there~o by said first arcuate lip.
In the accompanying drawings which illustrate an exemplary . .
e~bodiment o~ t~e pxesent invention: :
~igure 1 is a perspective of a device showing the relationship o feed inlet to the trapezoidal eed;
Pigure 2 is a center line section of Figure 1, showing the rela~ionship of feed to the inclined plane and the flow reversal mechanism;
and ~igure 3 is a general vi.ew~ showing the relationship of the feed box to other~ apparatus, for example, such as a traveling belt filter.
Reerring to Figure 19 it is a generalized view of a feed box mounted in place and related to th~ general functioning thereof.
~igure 3 sho~s a section of t~e feed box which consists of a base, lQ, generally trapez~idal in shape, having a truncated apex, 11, a bottom edge,.l2, and the mclined side edges, 13 and 14. The rear edge, l:L, is 30 . joined to an upwardlr extending side~ lS~ which is matched by sim~lar lateral ~ 2 ~
~5~
pieces, 16 and 17, defining a triangular sort of trough. A box is formed by joining to this the top, 18, which has an extent from the base, ll, to about half way down the height of the trapezoid, to terminate in edge, 19, wi~h rear edge, 20. Mounted in the top and held in plac~e, is the ~eeding opening, 21, held in place by gussets, 22, 23, 24.
These elements constitute the basic structure which gives a trapezoidal shaped trough to receive the feed entering -the device through feed opening 21.
The planar bottom, as best shown in Figure 2, terminates beyond edge, 12, in upwardly turned arcuate edge, 30, which is a 90 turn out from the base, lO. It is joined by a similarly downwardly directed base, 31, to give a 180 turn, which terminates in apron, 32. The edge, 36, formed by the two oppositely faced 90 arcuate turns, is faced by semi-circular trough, 33, offset by about half its radius, from the line, 30, 31, to create a 180 turn.
Support for the discharge end of the structure is in the aprons, 34, 35, which may be varied to fit the particular machine being fed.
In operation the device is basically adapted to receive an aqueous mixture of li~uid and solid sludge and slurry~ through the opening,21, which merely by virtue of being fed under the cover, 19, is spread out over the trapezoidal base, 10, which base being held at an incline of 22-1/2 to 45", or so, to 60, will give the sludge a velocity, such that on reaching the edge, 12, it meets the curve, 30, which deflects it 90 from its direction of travel on to arcuate deflection plate, 33, which again tu-rns it around on to arcuate plate, 31, to be discharged as a uniform quiet flowing mass from plate, 32.
~ithout the arcuate members to change the direction of flow, we have found that the feed of a sludge from a mechanism, is not only non-uniform~
but is messy, and a great deal of splash loss is introduced. By literally absorbing some of the energy of the sludge in this gentle mixing operation, at the end oE its tra~el path~ we succeed in spreading it neatly over the feed area.
~53~
It is to be understood, that variations of the structure can be devised without departing from the principle which involves the feed, the inclined plane and the 180 change in direction of flow by the juxtaposition of the arcuate surfaces as indicated.
I have found the trapezoidal shaped box useful in fabricating the device, but literally any geometrical outline is adequate, for the only function is to direct the feed down the incline causing it to spread out a bit and the novel end of the structure is to slow down the flow by causing it literally to do a summersault as it passes on to the point of disposition.
For exan~ple, the symmetrical form shown in Figure 3 is basically trapezoidal, but it can be arcuate in form by having sides 13, 14 and 20, being an open arc; with an arcuate; and 13 and 1~ tangential extensions thereof.
::
.: . . . . . . . .
The presen-t invention relates to the handling of slurries or sludges, and more particularly to a feed box suitable for use in the separa-tion of a product from its medium in which it occurs or is ~ormed. Such separation usually involves a filtration operation. It may also be useful in certain drying and flaking operations and also it may be useful as a travel-ing device to spread a uniform layer on a surface, for example cement or concrete from a traveling machine.
When using a wash box on a traveling belt filter the liquor must be uniformly spread over the filter cake without stirring up or disturbing the cake.
A characteristic process to which the present invention is applicable is the formation of phosphoric acid by any traditional or wet method whether it be in the hemihydrate mode or the gypsum mode. The final aqueous medium will be a mixture of phosphoric acid with calcium sulphate, which is required to be filtered. This mobile solid-liquid mixture is passed to a filtration device and in a preferred type of operation to a moving belt filter. In this latter manoeuvre where the final filtration is on a moving bel~ and the washing occurs in stages along the belt, reasonably uniform dis-tribution of slurry over the belt is most essential.
In a quite different kind of operation, movement of cellulose -aqueous pulp in paper making machinery is necessary, for example, from a head box into a paper-forming machine. This involves again a solid liquid slurry, whose handling is aided if it can be distributed uniformly across the section of the machine in which the movement is occurring.
In a related kind o operation, pouring of concrete involves an aqueous sludge, genera~ly quite high in solid content, but, nevertheless, in pouring concrete -for extended surfaces, a pour which gives a reasonable uni-form distribution over a surface is most useful.
It is accordingly a basic objec~ o~ this invention to provide a device suitable for use in applications, wherein a solid-liquid sludge or 3~
slurry is being handled, so that the sludge can bc fed into the device and spread relatively uniformly over a receiving surface as it makes its exit from the device.
According to the present invention there is provided a sludge, slurry or liquid mater;al feeding device comprising a hecad box with inLet ` means for said material, sides and bottom to guide said material, an o en end to direct said feed to a point of disposition, means to hold the box bottom at an incline o ~etween 22-1~2 and 60 to the horizontal~ such that the material flows from said inlet down said incline to develop some ve:locityJ
means terminating the bottom of the box transversely at the end o the incline in an upwardly directed arcuate lip, terminated about 90 to the direction o 10w o said material, and immediately upon termination of said arcuate lip arcuate means again reversing the direction 90 to form tangential arcs, arcuate means acing said tangential arcs to intercept and reverse the flow of material directed there~o by said first arcuate lip.
In the accompanying drawings which illustrate an exemplary . .
e~bodiment o~ t~e pxesent invention: :
~igure 1 is a perspective of a device showing the relationship o feed inlet to the trapezoidal eed;
Pigure 2 is a center line section of Figure 1, showing the rela~ionship of feed to the inclined plane and the flow reversal mechanism;
and ~igure 3 is a general vi.ew~ showing the relationship of the feed box to other~ apparatus, for example, such as a traveling belt filter.
Reerring to Figure 19 it is a generalized view of a feed box mounted in place and related to th~ general functioning thereof.
~igure 3 sho~s a section of t~e feed box which consists of a base, lQ, generally trapez~idal in shape, having a truncated apex, 11, a bottom edge,.l2, and the mclined side edges, 13 and 14. The rear edge, l:L, is 30 . joined to an upwardlr extending side~ lS~ which is matched by sim~lar lateral ~ 2 ~
~5~
pieces, 16 and 17, defining a triangular sort of trough. A box is formed by joining to this the top, 18, which has an extent from the base, ll, to about half way down the height of the trapezoid, to terminate in edge, 19, wi~h rear edge, 20. Mounted in the top and held in plac~e, is the ~eeding opening, 21, held in place by gussets, 22, 23, 24.
These elements constitute the basic structure which gives a trapezoidal shaped trough to receive the feed entering -the device through feed opening 21.
The planar bottom, as best shown in Figure 2, terminates beyond edge, 12, in upwardly turned arcuate edge, 30, which is a 90 turn out from the base, lO. It is joined by a similarly downwardly directed base, 31, to give a 180 turn, which terminates in apron, 32. The edge, 36, formed by the two oppositely faced 90 arcuate turns, is faced by semi-circular trough, 33, offset by about half its radius, from the line, 30, 31, to create a 180 turn.
Support for the discharge end of the structure is in the aprons, 34, 35, which may be varied to fit the particular machine being fed.
In operation the device is basically adapted to receive an aqueous mixture of li~uid and solid sludge and slurry~ through the opening,21, which merely by virtue of being fed under the cover, 19, is spread out over the trapezoidal base, 10, which base being held at an incline of 22-1/2 to 45", or so, to 60, will give the sludge a velocity, such that on reaching the edge, 12, it meets the curve, 30, which deflects it 90 from its direction of travel on to arcuate deflection plate, 33, which again tu-rns it around on to arcuate plate, 31, to be discharged as a uniform quiet flowing mass from plate, 32.
~ithout the arcuate members to change the direction of flow, we have found that the feed of a sludge from a mechanism, is not only non-uniform~
but is messy, and a great deal of splash loss is introduced. By literally absorbing some of the energy of the sludge in this gentle mixing operation, at the end oE its tra~el path~ we succeed in spreading it neatly over the feed area.
~53~
It is to be understood, that variations of the structure can be devised without departing from the principle which involves the feed, the inclined plane and the 180 change in direction of flow by the juxtaposition of the arcuate surfaces as indicated.
I have found the trapezoidal shaped box useful in fabricating the device, but literally any geometrical outline is adequate, for the only function is to direct the feed down the incline causing it to spread out a bit and the novel end of the structure is to slow down the flow by causing it literally to do a summersault as it passes on to the point of disposition.
For exan~ple, the symmetrical form shown in Figure 3 is basically trapezoidal, but it can be arcuate in form by having sides 13, 14 and 20, being an open arc; with an arcuate; and 13 and 1~ tangential extensions thereof.
::
.: . . . . . . . .
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A sludge, slurry or liquid material feeding device comprising a head box with inlet means for said material, sides and bottom to guide said material, an open end to direct said feed to a point of disposition, means to hold the box bottom at an incline of between 22-1/2" and 60° to the horizontal, such that the material flows from said inlet down said incline to develop some velocity, means terminating the bottom of the box transversely at the end of the incline in an upwardly directed arcuate lip, terminated about 90°
to the direction of flow of said material, and immediately upon termination of said arcuate lip arcuate means again reversing the direction 90° to form tangential arcs, arcuate means facing said tangential arcs to intercept and reverse the flow of material directed thereto by said first arcuate lip.
to the direction of flow of said material, and immediately upon termination of said arcuate lip arcuate means again reversing the direction 90° to form tangential arcs, arcuate means facing said tangential arcs to intercept and reverse the flow of material directed thereto by said first arcuate lip.
2. A sludge, slurry or liquid feeding device according to claim 1 wherein the box has a truncated triangular bottom.
3. A sludge, slurry or liquid feeding device comprising a head box with inlet means for said feed, sides and bottom to guide said feed, an open end to direct said feed to a point of disposition means to hold the box bottom at an incline of between 22-1/2 and 60° to the horizontal, such that the feed flows from said inlet down said incline to develop some velocity, means terminating the bottom of the box transversely at the end of the incline in an upwardly directed arcuate lip to flip sludge upwardly, and a corresponding arcuate arrangement substantially semi-circular and spaced above said lip to reverse the direction of flow of sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA270,999A CA1053951A (en) | 1977-02-03 | 1977-02-03 | Feed box for liquid-solid mixtures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA270,999A CA1053951A (en) | 1977-02-03 | 1977-02-03 | Feed box for liquid-solid mixtures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1053951A true CA1053951A (en) | 1979-05-08 |
Family
ID=4107859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA270,999A Expired CA1053951A (en) | 1977-02-03 | 1977-02-03 | Feed box for liquid-solid mixtures |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1053951A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007070949A1 (en) * | 2005-12-20 | 2007-06-28 | Technological Resources Pty Limited | Feed box |
| CN109868708A (en) * | 2019-01-22 | 2019-06-11 | 浙江美通筑路机械股份有限公司 | A kind of broadening formula dispensing device and its solid-state adhesion agent truck spreader |
-
1977
- 1977-02-03 CA CA270,999A patent/CA1053951A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007070949A1 (en) * | 2005-12-20 | 2007-06-28 | Technological Resources Pty Limited | Feed box |
| AU2006326938B2 (en) * | 2005-12-20 | 2011-08-11 | Technological Resources Pty. Limited | Feed box |
| CN109868708A (en) * | 2019-01-22 | 2019-06-11 | 浙江美通筑路机械股份有限公司 | A kind of broadening formula dispensing device and its solid-state adhesion agent truck spreader |
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