CA1112026A - Rotary pan pelletizers - Google Patents
Rotary pan pelletizersInfo
- Publication number
- CA1112026A CA1112026A CA325,564A CA325564A CA1112026A CA 1112026 A CA1112026 A CA 1112026A CA 325564 A CA325564 A CA 325564A CA 1112026 A CA1112026 A CA 1112026A
- Authority
- CA
- Canada
- Prior art keywords
- pan
- central portion
- central
- raised
- plough
- 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
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 239000008188 pellet Substances 0.000 description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 238000005816 glass manufacturing process Methods 0.000 description 4
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 101000852483 Homo sapiens Interleukin-1 receptor-associated kinase 1 Proteins 0.000 description 1
- 102100036342 Interleukin-1 receptor-associated kinase 1 Human genes 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000012254 powdered material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B1/00—Preparing the batches
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/14—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in rotating dishes or pans
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/44—Preparation in the form of granules, pieces, or other shaped products
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B1/00—Preparing the batches
- C03B1/02—Compacting the glass batches, e.g. pelletising
Abstract
ABSTRACT
In a rotary pan pelletizer, a central circular portion of the bottom surface of the pan is raised above the level of the annular portion around this central portion, and a stationary central plough is disposed with its lower surface in close proximity to the raised central portion. Binder liquid is fed on to the raised central portion and in operation the central plough keeps the raised central portion substantially clear of build-up of the material to be pelletized, so reducing formation of lumps and stabilizing operation. Further ploughs or scrapers are disposed over the annular portion to maintain a constant level of build-up-of material thereon, at substantially the same depth as the height of the raised central portion.
In a rotary pan pelletizer, a central circular portion of the bottom surface of the pan is raised above the level of the annular portion around this central portion, and a stationary central plough is disposed with its lower surface in close proximity to the raised central portion. Binder liquid is fed on to the raised central portion and in operation the central plough keeps the raised central portion substantially clear of build-up of the material to be pelletized, so reducing formation of lumps and stabilizing operation. Further ploughs or scrapers are disposed over the annular portion to maintain a constant level of build-up-of material thereon, at substantially the same depth as the height of the raised central portion.
Description
1~ 26 - IMPROVEMENTS RELATING TO
ROTARY PAN PELLETIZERS
BACKGROUND OF THE INVENTION
.
- Field of the Invention.
This invention relates to rotary pan pelletizers, which are used to conver~ a powdered or finely divided materiai, such as a batch of glass-making ingredients, into dust-free pellets.
E~l3E~ _n of the Prior Art.
Known pelletizers of this kind comprise a circular pan with a circumferential rim, mounted for rotation about an inclined axis. A plurality of stationary ploughs and/or oscillating scrapers are usually disposed at different radial distances from the axis and with their lower sutfaces immediately above the bottom surface of the pan. The powdered or finely divided material, either dry or pre-wetted, is delivered into the rotating pan and sprayed with a liquid. In the case of a glass-making batch, the liquid may be water and/or an aqueous solution of a binder, such as caustic soda, which may provide a part or the whole of the Na20 content of the batch. As the pan rotates, the material forms nuclei which agglomerate and are compacted into pellets as they are rolled around the pan in well-defined streams, until the pellets have achieved the desired size, when they pass out over the rim and are collected for use.
It is normal practice to dispose the ploughs or scrapers so as to permit a bed of the material, e.~. from 5 to 20 mm thick, to build up on the bottom surface of the pan as a result of the impingement of the material and aqueous liquid on the surface. The ploughs or scrapers, apart from helping to define the streams of pellets, scrape ,- 1 Z~
the bed smooth so that the pellets can roll and agglomerate on it in the desired controllecl manner. ~he bed also pro-tects the bottom surface of the pan from wear. If the bed builds up to an excessive thickness 3 however, a considerable amount of the material w~ll be scraped off it by the ploughs or scrapers in the form of lumps, This lumpy material, ~ particularly when scraped off by the plough nearest to the ¦ pan axis, can be out of specification for size, compositionand strength, as it has not passed through the normal cycle of nucleation, agglomeration and compaction, and can cause instability in the rlmning of the pelletizer.
~ - SUMMARY OF THE INVENTION
¦ - According to the present lnvention, a rotary pan pelletizer comprises a circular pan with a circumferential rim, mounted for rotation about an inclined axis, means for feeding material to be pelletized into the pan, and means for feeding a binder liquid on to a central area of the bottom surface of the pan, wherein the bottom surface of the pan is provided with a central circular portion which is raised above the level of the annular portion outside the said central portion and which extends radially substant-I ially as far from the pan axis as the area on to which the 7 binder liquid can be fed, and the pelletizer also comprises-~ a stationary central plough disposed so as to operate over~3 25 the whole area of the raised central portion of the bottom surface of the pan, with the lower surface of the central plough in close proximity to the raised central portion, and one or more further ploughs or scrapers disposed so as to operate o~ler the whole area of the annular portion aro~lnd the said central portion and hav:Lrlg their lower surfaces in .... .. ... - ~ :
.
¦ substantially the same plane as that of the central piough.
¦ With this arrangement, the raised central portion of the bottom surface of the pan is kept substantially clear of accumulated material by the action of the liquid feed and the central plough immediately above it, so that the forma-tion of lumps is greatly reduced~ and the pelletizer runs in a stable manner. The annular outer area fills with the material to be pelletized, to form a bed of substar.tially the same depth as the central raised area, so that the whole surface of the pan on which the pellets are formed and rolled is in effect substantially smooth and flat, being formed in part by the clean surface of the central area and ! in part by the bed of material to be pelletized.
- Preferably the raised central portion of the bottom surface of the pan is formed by the upper surface of a circular plate secured to t~e bottom of the pan. The plate can serve as a wear plate, which takes any wear due to running in close proximity to the plough, and which can ¦ be replaced when necessary without requiring replacement of the whole pan. T~ie raised central portion ma7 be sub-stantially 20 mm above the level of the outer area, and ~ its diameter may be substantially 5/8 of the diameter of 3 the pan.
I The lower surface of the central plough may lie at a height of 6 to 12 mm above the raised central portlon ~ of the bottom surface of the pan.
,7 B ~ F DESCRIPTICN OF THE DRAWINGS
Figure l is a perspective view of a rotary pan pelletizer;
.
Figure 2 is a cross-section through the pan;
Figure 3 is a cross-section through an alternative form of pan, and Figure 4 is a plan view of the pan, showing a modified arrangement of ploughs an'd liquid feeding means.
DETAILED DESCRIPTIO~.OF THE INVENTION
In the apparatus illustrated, a circular pan 10 with a circumferential rim ll is mounted on a base 12 for r?tation about an axis 14 inclined to the horizontal at an.angle of between 40 and 60, preferably between 45 and 50. The bottom surface of the pan 10 comprises a flat . annular outer portion 15 ana a central portion 16 raised above the level of the annular outer portion. The raised I .central portion 16 is formed by the upper surface of a cir-1 15 cular wear plate 17 secured to the bottom of the pan lO
¦ by countersunk screws 18. The plate 17 may be, for example, 20 mm thick and its diameter may be substantially 5/8 of the diameter of the pan lO, being for example 60 cm in dia-meter for a pan of 98 cm diameter.
A stationary plough 20 is supported from a bar . 21 at an angle to the pan radius and with its lower surface 22 in close proximity to the raised central portion 16.
me clearance between the plough 20 and the raised portion 16 is insufficient to permit a fully formed pellet to pass between them, but sufficient for the small fragments whi~h form nuclei on which-pellets grow. At least one further plough, and as shown two ploughs 23 and 24, is or are pro-vided over the annular outer area 15, supported from the bar 21. These further ploughs 23, 24, have their l.ower - 30 surfaces 25, 26, in the same pl&ne as the lowe1 sur,ace . -- 4 --.
,, .,,. - ~
Z~;
22 of the central plough 20. Between them, the ploughs 20, 23, 24, operate over the whole area of the bottom of the pan during its rotation. In the example illustrated, the ploughs are parallel to one another, but this is not always the case. The number, spacing and distribution of the ploughs can be varied in known manner so as to control the flows of material an~ io allow the normal stream pattern to develop.on the pan during its rotation.
. A single plough 20 is normally used to operate over the central raised portion l6? and radial overlap between ploughs is kept to a minimum.
A nozzle 27 is provided for spraying an aqueous . . liquid on to a central area of the bottom of the pan lO
:' .during operation, to act as a.binder. This central area .
:~ 15 is substantially wholly within the raised central portion l~, though it may extend radially from the pan axis 14 as far - as the edge of the r.aised portion. The material to be i pelletized is supplied into the pan lO by a conveyor indi-cated diagrammatically at 28. A chute 29 is provided to receive pellets from the pan lO and to direct them to collecting means (not shown).
In use, aqueous liquid is first sprayed into the pan lO from nozzle 27, and the powdered or finely dividedmaterial is supplied by.conveyor 28 to the pan. In the case of a glass-making batch, the material will normally be finely powdered and would be difficult to handle, particularly for feeding to a glass making furnace, because of the diffi-culty of avoiding loss of fine powders in a draughty environment. For a soda-containing glass, the aqueous liquid 30 . can advantageously be a concentrated caustic soda solution _ 5 _ , z~ :
providing a part or the whole of the Na20 content of the glass, The pan 10 is rotated in the clockwise direction as indicated b~ arrow 30. At least the central area of the raised portion 16 of the bottom surface of the pan is initially wetted by the oaustic soda solution, and the batch material then tends to build up on it, but the central plough 20, with the spray of liquld from nozzle 27, prevents any substantial build-up and transfers the material to the annular outer portion 15 where it can build up a bed some 20 mm ¦ 10 deep under the outer ploughs 23, 24. At the same time, thebatch material forms nuclei ~rhich are agglomerated and com-pacted in known manner as they rol~ around the smooth, flat surface which is provided over the whole area of the pan, by the bed formed on the outer annular portion 15 and by the raised central portion 16 of the bottom of the pan.
The flow pattern of nuclei and pellets in the rotating pan is controlled by the ploughs 20, 23, 24 in known manner.
Because the central portion 16 of the bottom of the pan is ¦ kept substantially free from build-up of batch material, formation of lumps is greatly reduced and the pelle~izer runs in a stable manner.
me size of the pellets formed can be controlled by variation of the height of the lower surface 22 of the centre plough 20 above the central portion 16 of the bottom surface of the pan, as indicated in the following Table:-t - 6 -.
,
ROTARY PAN PELLETIZERS
BACKGROUND OF THE INVENTION
.
- Field of the Invention.
This invention relates to rotary pan pelletizers, which are used to conver~ a powdered or finely divided materiai, such as a batch of glass-making ingredients, into dust-free pellets.
E~l3E~ _n of the Prior Art.
Known pelletizers of this kind comprise a circular pan with a circumferential rim, mounted for rotation about an inclined axis. A plurality of stationary ploughs and/or oscillating scrapers are usually disposed at different radial distances from the axis and with their lower sutfaces immediately above the bottom surface of the pan. The powdered or finely divided material, either dry or pre-wetted, is delivered into the rotating pan and sprayed with a liquid. In the case of a glass-making batch, the liquid may be water and/or an aqueous solution of a binder, such as caustic soda, which may provide a part or the whole of the Na20 content of the batch. As the pan rotates, the material forms nuclei which agglomerate and are compacted into pellets as they are rolled around the pan in well-defined streams, until the pellets have achieved the desired size, when they pass out over the rim and are collected for use.
It is normal practice to dispose the ploughs or scrapers so as to permit a bed of the material, e.~. from 5 to 20 mm thick, to build up on the bottom surface of the pan as a result of the impingement of the material and aqueous liquid on the surface. The ploughs or scrapers, apart from helping to define the streams of pellets, scrape ,- 1 Z~
the bed smooth so that the pellets can roll and agglomerate on it in the desired controllecl manner. ~he bed also pro-tects the bottom surface of the pan from wear. If the bed builds up to an excessive thickness 3 however, a considerable amount of the material w~ll be scraped off it by the ploughs or scrapers in the form of lumps, This lumpy material, ~ particularly when scraped off by the plough nearest to the ¦ pan axis, can be out of specification for size, compositionand strength, as it has not passed through the normal cycle of nucleation, agglomeration and compaction, and can cause instability in the rlmning of the pelletizer.
~ - SUMMARY OF THE INVENTION
¦ - According to the present lnvention, a rotary pan pelletizer comprises a circular pan with a circumferential rim, mounted for rotation about an inclined axis, means for feeding material to be pelletized into the pan, and means for feeding a binder liquid on to a central area of the bottom surface of the pan, wherein the bottom surface of the pan is provided with a central circular portion which is raised above the level of the annular portion outside the said central portion and which extends radially substant-I ially as far from the pan axis as the area on to which the 7 binder liquid can be fed, and the pelletizer also comprises-~ a stationary central plough disposed so as to operate over~3 25 the whole area of the raised central portion of the bottom surface of the pan, with the lower surface of the central plough in close proximity to the raised central portion, and one or more further ploughs or scrapers disposed so as to operate o~ler the whole area of the annular portion aro~lnd the said central portion and hav:Lrlg their lower surfaces in .... .. ... - ~ :
.
¦ substantially the same plane as that of the central piough.
¦ With this arrangement, the raised central portion of the bottom surface of the pan is kept substantially clear of accumulated material by the action of the liquid feed and the central plough immediately above it, so that the forma-tion of lumps is greatly reduced~ and the pelletizer runs in a stable manner. The annular outer area fills with the material to be pelletized, to form a bed of substar.tially the same depth as the central raised area, so that the whole surface of the pan on which the pellets are formed and rolled is in effect substantially smooth and flat, being formed in part by the clean surface of the central area and ! in part by the bed of material to be pelletized.
- Preferably the raised central portion of the bottom surface of the pan is formed by the upper surface of a circular plate secured to t~e bottom of the pan. The plate can serve as a wear plate, which takes any wear due to running in close proximity to the plough, and which can ¦ be replaced when necessary without requiring replacement of the whole pan. T~ie raised central portion ma7 be sub-stantially 20 mm above the level of the outer area, and ~ its diameter may be substantially 5/8 of the diameter of 3 the pan.
I The lower surface of the central plough may lie at a height of 6 to 12 mm above the raised central portlon ~ of the bottom surface of the pan.
,7 B ~ F DESCRIPTICN OF THE DRAWINGS
Figure l is a perspective view of a rotary pan pelletizer;
.
Figure 2 is a cross-section through the pan;
Figure 3 is a cross-section through an alternative form of pan, and Figure 4 is a plan view of the pan, showing a modified arrangement of ploughs an'd liquid feeding means.
DETAILED DESCRIPTIO~.OF THE INVENTION
In the apparatus illustrated, a circular pan 10 with a circumferential rim ll is mounted on a base 12 for r?tation about an axis 14 inclined to the horizontal at an.angle of between 40 and 60, preferably between 45 and 50. The bottom surface of the pan 10 comprises a flat . annular outer portion 15 ana a central portion 16 raised above the level of the annular outer portion. The raised I .central portion 16 is formed by the upper surface of a cir-1 15 cular wear plate 17 secured to the bottom of the pan lO
¦ by countersunk screws 18. The plate 17 may be, for example, 20 mm thick and its diameter may be substantially 5/8 of the diameter of the pan lO, being for example 60 cm in dia-meter for a pan of 98 cm diameter.
A stationary plough 20 is supported from a bar . 21 at an angle to the pan radius and with its lower surface 22 in close proximity to the raised central portion 16.
me clearance between the plough 20 and the raised portion 16 is insufficient to permit a fully formed pellet to pass between them, but sufficient for the small fragments whi~h form nuclei on which-pellets grow. At least one further plough, and as shown two ploughs 23 and 24, is or are pro-vided over the annular outer area 15, supported from the bar 21. These further ploughs 23, 24, have their l.ower - 30 surfaces 25, 26, in the same pl&ne as the lowe1 sur,ace . -- 4 --.
,, .,,. - ~
Z~;
22 of the central plough 20. Between them, the ploughs 20, 23, 24, operate over the whole area of the bottom of the pan during its rotation. In the example illustrated, the ploughs are parallel to one another, but this is not always the case. The number, spacing and distribution of the ploughs can be varied in known manner so as to control the flows of material an~ io allow the normal stream pattern to develop.on the pan during its rotation.
. A single plough 20 is normally used to operate over the central raised portion l6? and radial overlap between ploughs is kept to a minimum.
A nozzle 27 is provided for spraying an aqueous . . liquid on to a central area of the bottom of the pan lO
:' .during operation, to act as a.binder. This central area .
:~ 15 is substantially wholly within the raised central portion l~, though it may extend radially from the pan axis 14 as far - as the edge of the r.aised portion. The material to be i pelletized is supplied into the pan lO by a conveyor indi-cated diagrammatically at 28. A chute 29 is provided to receive pellets from the pan lO and to direct them to collecting means (not shown).
In use, aqueous liquid is first sprayed into the pan lO from nozzle 27, and the powdered or finely dividedmaterial is supplied by.conveyor 28 to the pan. In the case of a glass-making batch, the material will normally be finely powdered and would be difficult to handle, particularly for feeding to a glass making furnace, because of the diffi-culty of avoiding loss of fine powders in a draughty environment. For a soda-containing glass, the aqueous liquid 30 . can advantageously be a concentrated caustic soda solution _ 5 _ , z~ :
providing a part or the whole of the Na20 content of the glass, The pan 10 is rotated in the clockwise direction as indicated b~ arrow 30. At least the central area of the raised portion 16 of the bottom surface of the pan is initially wetted by the oaustic soda solution, and the batch material then tends to build up on it, but the central plough 20, with the spray of liquld from nozzle 27, prevents any substantial build-up and transfers the material to the annular outer portion 15 where it can build up a bed some 20 mm ¦ 10 deep under the outer ploughs 23, 24. At the same time, thebatch material forms nuclei ~rhich are agglomerated and com-pacted in known manner as they rol~ around the smooth, flat surface which is provided over the whole area of the pan, by the bed formed on the outer annular portion 15 and by the raised central portion 16 of the bottom of the pan.
The flow pattern of nuclei and pellets in the rotating pan is controlled by the ploughs 20, 23, 24 in known manner.
Because the central portion 16 of the bottom of the pan is ¦ kept substantially free from build-up of batch material, formation of lumps is greatly reduced and the pelle~izer runs in a stable manner.
me size of the pellets formed can be controlled by variation of the height of the lower surface 22 of the centre plough 20 above the central portion 16 of the bottom surface of the pan, as indicated in the following Table:-t - 6 -.
,
2~
Height of centre Pellet size - ~ in range plough 20 above central portion 16 6-9 mm 9-12 mm 12-15 mm over 15 mm 6 mm 10 90 9 mm 45 55 12 mm 5 95 15 mm 5 95 ' . I
With the plough 20 at a height of 15 mm above the central portion 16, however, it is found that instability of operation 10 begins to be experienced, so it is preferred to use heights of 6 to 12 mm.
The wear plate 17, carrying the raised central portion 16, may be of steel or other wear-resistant material. It takes any wear arising from the close proximity of the 15 stationary plough 20 to the rotating pan surface, and it can be replaced when necessary. In some circumstances, however, it may be preferred to form the raised central portion 16 on an integral raised portion 31 of the bottom of the pan 10, as shown in Fig. 3.
Fig. 4 illustrates a modified arrangement, in which the pan 10 with its raised central portion 16 is as shown in Figs. 1 and 2 or Fig. 3, but in which only two ploughs are employed. The centre plough 201 is here disposed wholly to the left of pan axis 14, whereas in Fig. 1 centre plough 20 extends to the right of the axis 14. The outer plough 241 in Fig. 4 is not parallel to the centre plough 20; it extends from the rim 11 up to or just over the edge of the raised central portion 16, so that as before the ploughs operate between them over the whole area of the 2~
.
pan during its rotation. The precise disposition of the ploughs in any particular case depends on the inclination of the pan axis to the horizontal. The liquid feeding means is shown in Fig. 4 as comprising two elongated nozzles 271, 272, which can be used to feed water and caustic soda solution separately on to~the central area of the pan in cases where this may be necessary. Fig. 4 also shows an elongated feeding means 281 for feeding the dry powdered material which is to be pelletized into the pan 10.
While the use of a central plough over the central raised portion 16 of the bottom surface of the pan is essential, other forms of scrapers, such as rotary scrapers may be used over the annular outer portion 15 to keep the bed of material to substantially the same depth as the raised portion 16.
.
i ' `
,' . . ~:
: .
- B -, ' ' ~
.~
Height of centre Pellet size - ~ in range plough 20 above central portion 16 6-9 mm 9-12 mm 12-15 mm over 15 mm 6 mm 10 90 9 mm 45 55 12 mm 5 95 15 mm 5 95 ' . I
With the plough 20 at a height of 15 mm above the central portion 16, however, it is found that instability of operation 10 begins to be experienced, so it is preferred to use heights of 6 to 12 mm.
The wear plate 17, carrying the raised central portion 16, may be of steel or other wear-resistant material. It takes any wear arising from the close proximity of the 15 stationary plough 20 to the rotating pan surface, and it can be replaced when necessary. In some circumstances, however, it may be preferred to form the raised central portion 16 on an integral raised portion 31 of the bottom of the pan 10, as shown in Fig. 3.
Fig. 4 illustrates a modified arrangement, in which the pan 10 with its raised central portion 16 is as shown in Figs. 1 and 2 or Fig. 3, but in which only two ploughs are employed. The centre plough 201 is here disposed wholly to the left of pan axis 14, whereas in Fig. 1 centre plough 20 extends to the right of the axis 14. The outer plough 241 in Fig. 4 is not parallel to the centre plough 20; it extends from the rim 11 up to or just over the edge of the raised central portion 16, so that as before the ploughs operate between them over the whole area of the 2~
.
pan during its rotation. The precise disposition of the ploughs in any particular case depends on the inclination of the pan axis to the horizontal. The liquid feeding means is shown in Fig. 4 as comprising two elongated nozzles 271, 272, which can be used to feed water and caustic soda solution separately on to~the central area of the pan in cases where this may be necessary. Fig. 4 also shows an elongated feeding means 281 for feeding the dry powdered material which is to be pelletized into the pan 10.
While the use of a central plough over the central raised portion 16 of the bottom surface of the pan is essential, other forms of scrapers, such as rotary scrapers may be used over the annular outer portion 15 to keep the bed of material to substantially the same depth as the raised portion 16.
.
i ' `
,' . . ~:
: .
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Claims (5)
1. A rotary pan pelletizer comprising a circular pan with a circumferential rim, mounted for rotation about an inclined axis, means for feeding material to be pelletized into the pan, and means for feeding a binder liquid on to a central area of the bottom surface of the pan, wherein the bottom surface of the pan is provided with a central circular portion which is raised above the level of the annular portion around the said central portion and which extends radially sub-stantially as far from the pan axis as the area on to which the binder liquid can be fed, and the pelletizer also com-prises a stationary central plough disposed so as to operate over the whole area of the raised central portion of the bottom surface of the pan, with the lower surface of the central plough in close proximity to the raised central portion, and one or more further ploughs or scrapers disposed so as to operate over the whole area of the annular portion around the said central portion and having their lower sur-faces in substantially the same plane as that of the central plough.
2. A pelletizer according to Claim 1 wherein the raised central portion of the bottom surface of the pan is formed by the upper surface of a circular plate secured to the bottom of the pan.
3. A pelletizer according to Claim 1 wherein the raised central portion is substantially 20 mm above the level of the outer area.
4. A pelletizer according to Claim 1, wherein the diameter of the raised central portion is substantially 5/8 of the diameter of the pan.
5. A pelletizer according to Claim l, wherein the lower surface of the central plough lies at a height of 6 to 12 mm above the raised central portion of the bottom surface of the pan.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB16812/78 | 1978-04-27 | ||
| GB1681278 | 1978-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1112026A true CA1112026A (en) | 1981-11-10 |
Family
ID=10084117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA325,564A Expired CA1112026A (en) | 1978-04-27 | 1979-04-17 | Rotary pan pelletizers |
Country Status (20)
| Country | Link |
|---|---|
| US (1) | US4214863A (en) |
| JP (1) | JPS54158816A (en) |
| KR (1) | KR830001915B1 (en) |
| AR (1) | AR216842A1 (en) |
| AU (1) | AU519445B2 (en) |
| BE (1) | BE875944A (en) |
| BR (1) | BR7902580A (en) |
| CA (1) | CA1112026A (en) |
| DE (1) | DE2917279A1 (en) |
| DK (1) | DK161779A (en) |
| FI (1) | FI62230C (en) |
| FR (1) | FR2424058A1 (en) |
| GB (1) | GB2019768B (en) |
| IN (1) | IN150621B (en) |
| IT (1) | IT1124046B (en) |
| NL (1) | NL7903212A (en) |
| NZ (1) | NZ190215A (en) |
| SE (1) | SE429613B (en) |
| TR (1) | TR20341A (en) |
| ZA (1) | ZA791866B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023235951A1 (en) * | 2022-06-09 | 2023-12-14 | Vale S.A. | Device for pelletizing materials |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4413970A (en) * | 1981-02-27 | 1983-11-08 | Owens-Corning Fiberglas Corporation | Rotary scrapers |
| JPS57181175A (en) * | 1981-04-30 | 1982-11-08 | Hoxan Corp | Manufacture of polycrystalline silicon wafer |
| US4726755A (en) * | 1987-07-13 | 1988-02-23 | Holley Carl A | Disc Pelletizer |
| WO1989011462A1 (en) * | 1988-05-25 | 1989-11-30 | Robert Peng Kwan Leet | Controlled release fertilizer |
| KR100770294B1 (en) * | 2001-06-29 | 2007-10-25 | 주식회사 포스코 | Apparatus for preventing iron oxide form clotting in pellet drum |
| US7964529B2 (en) | 2003-07-11 | 2011-06-21 | The Clorox Company | Method of agglomeration |
| BRMU8402689Y1 (en) * | 2004-11-04 | 2013-09-24 | queen eliminator device in pelletizing discs | |
| KR101140948B1 (en) * | 2009-07-17 | 2012-05-03 | 현대제철 주식회사 | Scraper apparatus for dust pelletizer |
| CA2794692C (en) * | 2010-03-26 | 2017-12-12 | Nara Machinery Co., Ltd. | Method for granulating powder and granulation device |
| DE102010013096A1 (en) | 2010-03-29 | 2011-09-29 | Haver Engineering Gmbh | Pelletizer and method |
| DE102011113880A1 (en) | 2011-09-22 | 2013-03-28 | Haver Engineering Gmbh | Pelletizer and method |
| RU2491985C1 (en) * | 2012-04-09 | 2013-09-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования Кемеровский технологический институт пищевой промышленности | Dish pelletiser with activator |
| KR101405369B1 (en) * | 2012-07-05 | 2014-06-12 | 주식회사 유림산업 | Combining form-scrapper having spray function and pelletizer using the same |
| ES2610307T3 (en) * | 2014-08-13 | 2017-04-26 | Intersnack Group Gmbh & Co. Kg | Procedure and device for coating or mixing granular products, more precisely, peanuts, with a substance |
| RU2583817C1 (en) * | 2014-10-16 | 2016-05-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кемеровский технологический институт пищевой промышленности" | Dish-shaped mixer-granulator for mixing multicomponent mixtures with additives of viscous liquid |
| CN104474970B (en) * | 2014-12-01 | 2017-03-08 | 安东新材料（遂宁）有限公司 | A kind of ceramsite sand blastocyte and preparation method thereof |
| EP3801937A4 (en) * | 2018-06-01 | 2022-03-30 | Graintech Innovation Pty Ltd | A cleaning arrangement for a coating apparatus |
| FR3089823B1 (en) | 2018-12-13 | 2022-07-01 | Arkema France | Colored zeolite adsorbent |
| CN112497563B (en) * | 2020-11-12 | 2022-05-20 | 建德市春盛塑业有限公司 | Plastic particle and preparation process thereof |
| CN114601734B (en) * | 2022-01-19 | 2023-11-28 | 浙江健牌机械科技有限公司 | Rotary inclined pill rolling machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD17275A (en) * | ||||
| GB882409A (en) * | 1959-03-24 | 1961-11-15 | Albert Ag Chem Werke | Improvements in or relating to dish granulators |
| US3109632A (en) * | 1959-09-15 | 1963-11-05 | Wilhelm Eirich And Gustav Eiri | Mixers |
| US3214145A (en) * | 1962-04-05 | 1965-10-26 | Libbey Owens Ford Glass Co | Method and apparatus for mixing glass batch materials |
| US3206528A (en) * | 1962-07-02 | 1965-09-14 | Bausch & Lomb | Pelletizing process and apparatus |
| US3189326A (en) * | 1963-04-15 | 1965-06-15 | Libbey Owens Ford Glass Co | Mixing glass batch materials |
| NL6408488A (en) * | 1964-07-24 | 1966-01-25 | ||
| US3335456A (en) * | 1964-09-29 | 1967-08-15 | Onoda Cement Co Ltd | Pan-typed granulating machine |
| US3345683A (en) * | 1964-10-23 | 1967-10-10 | Eirich Wilhelm | Inclined-dish granulator and separator |
| DE1592617B1 (en) * | 1967-12-01 | 1971-07-29 | Hyperphosphat Gmbh Deutsche | Application of a granulating plate to the granulation of complex fertilizers |
| DE1667143A1 (en) * | 1968-01-30 | 1971-06-09 | Hans Koehler | Device for intensifying and improving the plate granulation process |
| US3749533A (en) * | 1971-11-15 | 1973-07-31 | Dravo Corp | Pelletizing apparatus |
| US3802822A (en) * | 1972-03-01 | 1974-04-09 | Mars Mineral Corp | Pelletizer |
| US3914364A (en) * | 1973-12-27 | 1975-10-21 | Dravo Corp | Method of pelletizing glass batch materials |
| US3883281A (en) * | 1974-06-21 | 1975-05-13 | Ferro Tech | Pelletizing disc assembly and control system |
| US3969100A (en) * | 1975-02-27 | 1976-07-13 | Ford Motor Company | Method of pelletizing glass batch materials |
-
1979
- 1979-04-17 CA CA325,564A patent/CA1112026A/en not_active Expired
- 1979-04-18 NZ NZ190215A patent/NZ190215A/en unknown
- 1979-04-19 ZA ZA791866A patent/ZA791866B/en unknown
- 1979-04-19 DK DK161779A patent/DK161779A/en not_active IP Right Cessation
- 1979-04-23 AR AR276265A patent/AR216842A1/en active
- 1979-04-23 GB GB7914033A patent/GB2019768B/en not_active Expired
- 1979-04-23 SE SE7903552A patent/SE429613B/en not_active IP Right Cessation
- 1979-04-24 IT IT12559/79A patent/IT1124046B/en active
- 1979-04-24 NL NL7903212A patent/NL7903212A/en unknown
- 1979-04-24 JP JP4986879A patent/JPS54158816A/en active Granted
- 1979-04-25 US US06/033,072 patent/US4214863A/en not_active Expired - Lifetime
- 1979-04-25 FI FI791346A patent/FI62230C/en not_active IP Right Cessation
- 1979-04-26 BR BR7902580A patent/BR7902580A/en unknown
- 1979-04-26 FR FR7910595A patent/FR2424058A1/en active Granted
- 1979-04-26 KR KR1019790001331A patent/KR830001915B1/en active
- 1979-04-26 TR TR20341A patent/TR20341A/en unknown
- 1979-04-27 AU AU46549/79A patent/AU519445B2/en not_active Ceased
- 1979-04-27 BE BE0/194913A patent/BE875944A/en not_active IP Right Cessation
- 1979-04-27 IN IN423/CAL/79A patent/IN150621B/en unknown
- 1979-04-27 DE DE19792917279 patent/DE2917279A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023235951A1 (en) * | 2022-06-09 | 2023-12-14 | Vale S.A. | Device for pelletizing materials |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2424058B1 (en) | 1981-10-16 |
| GB2019768A (en) | 1979-11-07 |
| SE7903552L (en) | 1979-10-28 |
| ZA791866B (en) | 1980-12-31 |
| JPS54158816A (en) | 1979-12-15 |
| FR2424058A1 (en) | 1979-11-23 |
| US4214863A (en) | 1980-07-29 |
| IT7912559A0 (en) | 1979-04-24 |
| KR830000652A (en) | 1983-04-16 |
| NL7903212A (en) | 1979-10-30 |
| FI62230C (en) | 1982-12-10 |
| FI791346A (en) | 1979-10-28 |
| NZ190215A (en) | 1982-03-09 |
| SE429613B (en) | 1983-09-19 |
| FI62230B (en) | 1982-08-31 |
| BE875944A (en) | 1979-10-29 |
| GB2019768B (en) | 1982-05-06 |
| KR830001915B1 (en) | 1983-09-23 |
| AR216842A1 (en) | 1980-01-31 |
| IT1124046B (en) | 1986-05-07 |
| AU519445B2 (en) | 1981-12-03 |
| TR20341A (en) | 1981-02-20 |
| DE2917279C2 (en) | 1988-01-28 |
| BR7902580A (en) | 1979-10-30 |
| DK161779A (en) | 1979-10-28 |
| IN150621B (en) | 1982-11-13 |
| AU4654979A (en) | 1979-10-11 |
| JPS631096B2 (en) | 1988-01-11 |
| DE2917279A1 (en) | 1979-11-15 |
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