GB2193449A - Air gravity classifier for loose materials - Google Patents
Air gravity classifier for loose materials Download PDFInfo
- Publication number
- GB2193449A GB2193449A GB08619404A GB8619404A GB2193449A GB 2193449 A GB2193449 A GB 2193449A GB 08619404 A GB08619404 A GB 08619404A GB 8619404 A GB8619404 A GB 8619404A GB 2193449 A GB2193449 A GB 2193449A
- Authority
- GB
- United Kingdom
- Prior art keywords
- duct
- chute
- loose material
- separation chamber
- ducts
- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
- B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
- B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
- B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/01—Selective separation of solid materials carried by, or dispersed in, gas currents using gravity
Abstract
An air gravity classifier for loose material comprises a vertical separation chamber (1) provided with longitudinal partitions (3) dividing it into ducts (4) through which an upward current of air is supplied via a grating (11), the partitions (3) being spaced from the grating (11). A pipe (8) delivers loose material into the separation chamber via an outlet (7) located on the wall (6) of one of the ducts (4). At least one inclined chute (12) having a perforated bottom and located beneath the outlet (7) conveys and distributes loose material in the ducts of the separation chamber. A clearance (8) provided between at least one of the walls of the chute and a respective wall of the duct (4). The chute (12) communicates with an adjacent duct at one end through a hold (13) made in a partition (3), the other end of the chute being secured on the opposite wall (6) of the duct (4). <IMAGE>
Description
SPECIFICATION
Air gravity classifier for loose materials
This invention relates to devices for separating hard loose materials in gas or air upflows, and more particularly it relates to air gravity classifiers for loose materials.
The present invention is aimed at separating polydisperse materials into two fractions up to 10 mm in size, the boundary size ranging from 0.05 to 2.0 mm and can be used for fractionation and separation of loose materials in the mining, metallurgical, chemical, construction, food industries, etc.
Multiduct classifiers are particularly useful at present in separating large amounts of loose materials so as diminish the effect of a socalled scale factor according to which an increase in the geometrical dimensions of the classifier proportional to its throughput capacity in terms of loose material leads to lower separating efficiency. Featuring a separation process running in the ducts with a loose ma-.
terial repeatedly crossing the gas flow, they provide a higher separating efficiency and have smaller dimensions as to height, the throughput-to-flow rate ratio being the same as that of single-duct classifiers.
The separation process is determined by the efficiency characterizing structural and technological features of the classifier which can numerically be expressed in terms of one of the known values, e.g. the Eder-Mayer value.
To provide for maximum efficiency at a specified throughput-to-flow rate ratio, it is expedient that the separation process be carried out in each duct under similar conditions, which is fairly difficult in the case of known multiduct classifiers.
There is known an air classifier featuring vertical gas upflow (cf. FRG Application No.
2,623,038, Int. C1. B 07 B 4/08, published in
1977), which accommodates a vertical separation chamber divided into parallel Z-shaped ducts by virtue of partitions, a pipe for the delivery of loose material located in the lower portion of the separation chamber, a perforated grating positioned at a certain angle below the ducts, a pipe for separating large fractions of loose material, and a chamber for separating small fractions in the gas flow.
Under the action of gas upflow, loose material is brought into fluidized condition on the grating, small fractions being carried away at a rapid pace into the Z-shaped ducts and subsequently into the chamber for separating small fractions.
Under the action of gas jets coming out of the grating openings and local variations in the turbulent gas flow rate, large fractions of loose material are likewise carried away into the duct, said fractions being thereafter separated irl the Z-shaped duct and returned to the fluidized bed. The thus-returned large fractions together with material not yet fractionated enter the neighbouring duct via the perforated grating, wherein the separation process is repeated, the number of small fractions entering the neighbouring duct decreasing and the separation conditions differing in each particular duct.As is known, the process of separation and delivery of material into the lower portion of the ducts being as it is, the classifier features relatively low efficiency which is about 0.65 according to the Eder-Mayer value, the throughput-to-flow rate ratio (,u) being, say, 2 kg/m3, as determined from the expression
Q
v where O is classifier throughput capacity in terms of material, kg/s,
V is gas flow rate, m3/s.
Hence the efficiency is about 0.65 according to the Mayer Eder value.
There is known an air gravity classifier for loose materials (USSR Inventor's Certificate
No. 787,113, Int.C1. B 07 B 4/08, published in 1975), which accommodates a vertical separation chamber interconnected with a device for building up gas upflow, said chamber being provided with longitudinal partitions dividing it into ducts, each of them incorporating a bank of elements for pouring and blowing through loose material located on the two opposite walls along the length of the duct, a pipe for the delivery of loose material into the separation chamber whose outlet is located on the wall of one of the peripheral ducts, a pipe for separating small fractions of loose material in the gas flow positioned in the upper portion of the separation chamber, and a pipe for separating large fractions of loose material located in the lower portion of the separation chamber with a grating for distributing the gas upflow duct-wise provided below the ducts with a clearance relative to the partitions. To deliver loose material, a louvered grating is provided below the pipe outlet, said grating being inclined towards the opposite peripheral duct.
The loose material is fed through the pipe to the louvered grating, wherein it is blown through under the action of the outcoming gas jets. With the loose material moving along the grating, small fractions are blown out and the material is saturated with gas, which leads to its dispersion, agglomerates of loose material particles being broken. After the louvered grating grating the material becomes involved in the gas upflow, wherein it is aerated additionally and separated roughly into small and large fractions.The basic separation process
runs in the separation chamber, wherein with the loose material repeatedly crossing the gas flow, small fractions are separated being car ried out of the ducts, whereas large fractions sink onto the grating and are mixed with the non-fractionated loose material to enter the neighbouring duct of the separation chamber, thereby increasing the possibility of carrying out these fractions together with small fractions in the other ducts and bringing down separating efficiency.
Large fractions thus separated are carried via the grating to the pipe for separating large fractions.
In the known air gravity classifier for loose materials the latter are fed into the medium length portion of the peripheral duct and the lower portion of each other duct of the separation chamber in succession. The separating efficiency in the known classifier is not more than 0.7 according to the Eder-Mayer value, the throughput-to-flow rate ratio (ji) being 2 kg/m3.
According to the invention there is provided a classifier for classifying loose materials, comprising a separation chamber, means for creating a gas flow upwards through the separation chamber, said chamber having longitudinal partitions defining ducts therebetween each duct having a plurality of elements for determining the movement of gas entrained loose material particles within the duct, delivery means for delivering loose material to the separation chamber, the delivery means communicating with a peripheral duct of the separation chamber, a chute located in a medial portion of the chamber and arranged to receive a material from the delivery means for conveying and distributing loose material within the separation chamber, the chute having a perforated bottom wall and extending into the peripheral duct to communicate with an adjacent duct, a clearance being defined between a side wall of the chute and a side wall of the duct, and the chute being inclined downwards towards the adjacent duct, means for removing a suspension of relatively small sized particles of loose material entrained in the gas flow from the upper portion of the separation chamber, means for removing relatively large sized particles of loose material from the lower portion of the chamber and means for distributing the gas upflow to the ducts arranged beneath the ducts with a clearance between the bottom of the longitudinal partitions and the distributing means.
It is an object of the present invention to provide an air gravity classifier for loose materials with a high separating efficiency.
This object is attained in an air gravity classifier for loose materials, comprising a vertical separation chamber interconnected with a device for building up gas upflow, said chamber being provided with longitunidal partitions dividing it into ducts, each of them incorporating a bank of elements for pouring and blowing through loose material located on the opposite walls along the length of the duct, a pipe for the delivery of loose material into the separation chamber whose outlet is located on the wall of one of the peripheral ducts, a pipe for separating small fractions of loose material in the gas flow positioned in the upper portion of the separation chamber, and a pipe for separating large fractions of loose material located in the lower portion of the separation chamber with a grating for distributing the gas upflow duct-wise provided below the ducts with a clearance relative to the partitions, said classifier accommodating, according to the invention, at least one chute with a perforated bottom for conveying and distribution of loose material in the ducts of the separation chamber located in the medium-length portion of the peripheral duct below the outlet of the pipe for the delivery of loose material with a clearance provided between at least one of its walls and a respective wall of the duct, said chute being fitted with its one end into the hole made in the wall of the duct provided by means of the partition and with the other end secured on the opposite wall, so that the geometric axis of the chute is arranged at an angle with the wall, thereby making the chute inclined towards the other peripheral duct.
It is expedient that with a group of chutes with a perforated bottom for conveying and distribution of loose material in the ducts of the separation chamber, each of said chutes be located in a respective duct of the separation chamber, fitted with its one end into the hole made in the wall of the duct provided by means of a respective partition and with the other end rigidly connected with the preceding chute, so that the geometric axis of each other chute in the direction from one peripheral duct to another is in line with the geometric axis of the preceding chute.
It is reasonable that each chute be provided with guide plates to fit the number of clearances between its walls and respective walls of the duct, each guide plate being positioned in a respective clearance along the chute with its one end secured on the wall of the chute and the free end facing the gas flow in this clearance.
In the air gravity classifier for loose materials claimed herein, the latter are fed into the mediumlength portion of the ducts of the separation chamber. This makes it possible to distribute the loose material in the ducts so as to preclude the possibility of mixing its large fractions separated in the ducts of the separation chamber with non-fractionated material, thereby noticeably increasing the separating efficiency which is 0.8 according to the Eder
Mayer value, the throughput-to-flow rate ratio (LL) being 2 kg/m3, or to increase the throughput-to-flow rate ratio approximately by 1.5 times at a preset efficiency equal to that of known classifiers.
The invention will be described further in terms of specific embodiments with reference to the accompanying drawings, wherein:
Figure 1 is a general schematic view of an air gravity classifier for loose materials showing its front wall broken away and a longitudinal section view of a pipe for the delivery of loose material, according to the invention;
Figure 2 is a scaled-up sectional view taken along line ll-il in Fig. 1, according to the invention;
Figure 3 is a scaled-up isometric representation of part of a separation chamber duct accommodating a chute with guide plates, its front wall being broken away, according to the invention.
The air gravity classifier for loose materials comprises a vertical separation chamber 1 (Fig. 1) interconnected with a device 2 for building up gas upflow (direction of the gas upflow is indicated with arrows A for clarity) which is a fan in the embodiment described herein. The separation chamber 1 is provided with longitudinal partitions 3 dividing it into ducts 4, each duct incorporating a bank of elements 5 for pouring and blowing through loose material (movement of loose material particles in the gas flow is shown with a dotted line for clarity). Provided on a wall 6 of one of the peripheral ducts 4 is an outlet 7 of a pipe 8 for the delivery of loose material into the separation chamber whose upper portion contains a pipe 9 for separating small fractions of loose material in the gas flow.A pipe 10 for separating large fractions of loose material is located in the lower portion of the separation chamber.
Provided below the ducts 4 with a clearance relative to the partitions 3 is a grating II for distributing the gas upflow duct-wise, said grating being inclined towards the pipe 10 for separating large fractions of loose material.
The classifier also accommodates at least one chute for conveying and distribution of loose material in the ducts of the separation chamber located in the medium-length portion of the peripheral duct 4 below the outlet 7 of the pipe 8 for the delivery of loose material.
In the embodiment described herein, the classifier comprises two chutes 12. The first chute 12 is fitted with its one end into a hole 13 made in the wall of the peripheral duct 4 provided by means of the partition 3 and with the other end secured on the opposite wall 6, so that its geometric axis is arranged at an angle o: with this wall. The x angle is determined experimentally on the basis of conveying loose material under fluidized bed conditions fr m the outlet 7 of the pipe 8 and depend upon its physical properties and granulometric composition.The second chute 12 is located in the duct 4 of the separation chamber next to the peripheral duct, its one end fitted into the hole 13 made in the wall of this duct 4 provided by means of a respective partition 3 and the other end rigidly connected with thq preceding chute 12, the geometric axis of the second chute 12 in the direction from one peripheral duct 4 to another being in line with the geometric axis of the first chute
12. In the event of a large number of chutes
12, it is reasonable that all of those be made as a single whole.
For separating small fractions of loose material from the gas flow, provision is made for a cyclone 14 connected with the pipe 9 for separating small fractions of loose material in the gas flow and with the device 2 for building up gas upflow.
The chute 12 has a perforated bottom 15 (Figs. 2, 3), the size of the openings being determined experimentally for each loose material with due regard for passage conditions of small fractions in the gas flow and ensuring the minimum passage of large fractions.
The number of chutes 12 is largely determined by the granulometric composition of loose material. In separating material with a low percentage of small fractions, those are carried away in the ducts 4 more or less evenly. To ensure adequate separation of such materials, it is sufficient to evenly distribute loose material in the first two ducts 4, one chute 12 being positioned in the peripheral duct 4. When it comes to separating material with a high percentage of small fractions, the number of chutes 12 is determined experimentally as a direct function of the above percentage.
The chute 12 is positioned in the duct 4 so that a clearance a is provided between at least one of its walls 16 and a respective wall
17 of the duct 4.
The movement of loose material particles in the process of separation are shown on the drawing as follows. The gas flow direction is indicated with arrows A; direction of small fractions in the gas flow, with arrows B; and direction of part of large fractions, with arrows C.
To prevent clogging of the clearance a with loose material particles, its minimum size should not be less than the double size of these particles.
Each chute 12 is provided with guide plates
18 (Fig. 3) to fit the number of clearances a between its walls 16 and respective walls 17 of the duct 4, each guide plate being positioned in a respective clearance a along the chute 12 with its one end secured on the wall
16 and the free end facing the gas flow (indicated with arrows A for clarity) in this clearance b.
In the embodiment described herein, the chute 12 is positioned in the duct 4 so that a clearance a is provided between its two walls
16 and respective walls 17 of the duct 4.
The guide plates 18 are provided with a mechanism 19 for adjusting the clearance between the free end of the plate 18 and the wall 17 of the duct 4 and determining the flow rate ratio of gas running through the clearance and the perforated bottom 15 of the chute 12 made as articulated jointly coupled levers fixed on the plates 18 and the walls 17 of the duct 4.
The air gravity classifier for loose materials operates as follows.
Loose material is fed through the outlet 7 (Fig. 1) of the pipe 8 for the delivery of loose material into the peripheral duct 4 of the separation chamber I onto the chute 12 provided in this duct 4. The gas flow enters the separation chamber I via the grating II and is evenly distributed in the ducts 4 on account of the high hydraulic resistance of the grating II.
While passing through the medium-length portion of the peripheral duct 4, the gas flow runs both via the perforated bottom 15 (Figs.
2,3) of the chute 12 and via the clearance a between the wall 16 of the chute 12 and a respective wall 17 of the duct 4, the flow rate of gas running through the clearance a and the perforated bottom 15 of the chute 12 being determined by their size.
The optimum width of the perforated bottom 15 of the chute 12 is 0.1 to 0.9 width of the duct 4. For a particular loose material the ratio of the width of the bottom 15 of the chute 12 to the width of the duct 4 is determined as follows. The rate of the gas flow over the chute 12 must provide for the fluidized bed conditions of the loose material, small fractions of the loose material carried from the lower portion of the duct 4 along with the gas flow must have sufficient kinatic energy so as to pass through the openings of the bottom 15 of the chute 12 whereas the clearance os between the wall 16 of the chute 12 and the walls 17 of the duct 4 must provide for a free access of large fractions into the lower portion of the dudt 4.
The loose material fed onto the chute 12 of the peripheral duct 4 is blown through with the gas flow which runs via the perforated bottom 15 of the chute 12, brought into fluidized condition, and becomes capable of moving along the chute 12 in the direction of another peripheral duct 4, small fractions being intensively separated from the loose material and carried away with the gas flow into the upper portion of the duct 4. Under the effect of gas jets, local variations in the turbulent gas flow rate, and collisions with small fractions, large fractions of the loose material are likewise carried upwards from the chute 12.Some large fractions deviate from the main gas flow outside the walls 16 of the chute 12 and sink into the clearance a between the wall 16 of the chute 12 and a respective wall 17 of the duct 4, whereas others are carried away with the gas upflow into the upper portion of the duct 4 together with small fractions.
A stable vortex with a horizontal axis is generated in the duct 4 (Fig. I) between each two elements 5 for pouring and blowing through loose material. This vortex flow involves almost the whole loose material and a smaller portion of the gas flow, its larger portion being carried with the upward Z-shaped current. Once poured from the elements 5, the loose material is deviated by virtue of the gas flow in the direction of the wall of the duct 4 opposite the point to which the element 5 is attached and intersects the flow crosswise.
The loose material becomes re-distributed so that one of its parts with a high percentage of small fractions goes upwards, whereas the other, containing mostly large fractions, moves downwards. This process occurs within the whole distance from the free end of the element 5 up to the wall of the duct 4 and results in the loose material being separated into two flows, one of which (small fractions) goes upwards and crosses once more the gas flow while leaving the element 5 located above, and the other (large fractions) moves onto the element 5 located below and likewise crosses the gas flow. Thus, there occurs a multiple periodic separation of the loose material in zones between the free end of each element 5 for pouring and blowing through loose material and the wall of the duct 4 opposite the point to which the element 5 is attached.As a result, large fractions, carried by the gas flow together with small fractions into the upper portion of the--duct 4, are separated from the latter and return onto the perforated bottom 15 of the chute 12 or into the clearances J between the walls 16 of the chute 12 and the walls 17 of the duct 4. The wall 16 (Fig. 2) of the chute 12 is somewhat inclined towards the central portion of the chute 12 so as to reduce the rate of the gas flow in the upper portion of the clearance a as compared to that in its lower portion and to ensure an easy passage of large fractions through the clearance 6.
As large fractions accumulate in the clearance 6, its hydraulic resistance goes up, the gas flow rate through the clearance os decreases, and the gas flow rate through the bottom 15 of the chute 12 increases. Thereby large fractions run through the clearance a without mixing up with non-separated loose material and enter the lower pofrtion of the duct 4 of the separation chamber I, wherein the small fractions, which have come into the lower portion of the duct 4 either because of the rate of the gas flow in the near-wall area being close to zero or because of their collisions with large fractions, are separated from large fractions in the same manner as in the upper portion of the duct 4 between the element 5 for pouring and blowing through loose material.
Large fractions thus separated sink from the duct 4 onto the grating ll (Fig. I) and move via the latter in fluidized condition through the clearance between the partitions 3 and the grating II into the neighbouring duct 4 of the separation chamber I. Small fractions are carried upwards together with the gas flow from the lower portion of the perforated bottom 15 (Figs. 2,3) of the chute 12 into the upper portion of this duct 4 (Fig. I).
Large fractions which have come back onto the chute 12 and the initial loose material or feed, which has not yet been fractionated while in the peripheral duct 4, enter via the opening 13 in the partition 3 the neighbouring duct 4 onto the other chute 12, wherein the separation process runs all over again.
In separating loose material with a low percentage of small fractions, it is sufficient, as was described above, to evenly distributed it in the two or three ducts 4 (provided one or two chutes 12 are available).
Large fractions and some small fractions in the lower portion of this duct 4 which have been separated in the duct 4, where. the end of the second chute 12 is positioned, sink onto the perforated grating Il and move via the latter in fluidized condition into the neighbouring duct 4, wherein the separation process takes place as is described above.
Hence, loose material is separated in all the ducts 4 of the separation chamber I.
In the embodiment described herein, a significant portion of large fractions is separated in the first (if viewed from where the loose material is fed) ducts 4, whereas final fractionation takes place in the remaining ducts 4.
Thus, the herein-described air gravity classifier has a separating efficiency of 0.8 according to the Eder-Mayer value, the throughput-to-flow rate ratio () being 2 kg/m3.
In case the chute 12 (Fig. 3) has guide plates 18 determining the gas flow rate through the perforated bottom 15 of the chute 12, it is possible to feed equal quantities of loose material into each duct 4, which results in the most optimum separation conditions in the ducts 4. Should loose materials with different characteristics (granulometric composition, moisture content) be separated in one and the same classifier as might be prescribed by technological requirements, it is possible to adjust the clearance between the free end of the plate 18 and the wall 1 7 by virtue of the mechanism 19, said clearance being provided for before starting operations by turning the plate 18 around its axis.Should the plates 18 be inclined to the walls 17 of the duct 4, the gas flow rate through the perforated bottom 15 of the chute 12 increases, as does the amount of loose material fed from the chute 12 intq the duct 4. Small fractions separated in all the ducts 4 of the separation chamber I are carried by the gas flow via the pipe 9 (Fig. I) into the cyclone 14, wherein these settle on the walls and accumulate in the bin.
Large fractions are discharged from the grating
II through the pipe 10 for separating large fractions of loose material.
Hence, in the herein-claimed air gravity classifier for loose materials, there is provided an optimum distribution of loose material in the ducts of the separation chamber with due regard for its particular granulometric composition, the possibility of mixing up large fractions with non-fractionated material being precluded, thereby ensuring higher separating efficiency.
Claims (5)
1. A classifier for classifying looser materials, comprising a separation chamber, means for creating a gas flow upwards through the separation chamber, said chamber having longitudinal partitions defining ducts therebetween, each duct having a plurality of elements for determining the movement of gas entrained loose material particles within the duct, delivery means for delivering loose material to the separation chamber, the delivery means communicating with a peripheral duct of the separation chamber, a chute located in a medial portion of the chamber and arranged to receive material from the delivery means for conveying and distributing loose material within the separation chamber, the chute having a perforated bottom wall and extending into the peripheral duct to communicate with an adjacent duct, -a clearance being defined between a side wall of the chute and a side wall of the duct, and the chute being inclined downwards towards the adjacent duct, means for removing a suspension of relatively small sized particles of loose material entrained in the gas flow from the upper portion of the separation chamber, means for removing relatively large sized particles of loose material from the lower portion of the chamber and means for distributing the gas upflow to the ducts arranged beneath the ducts with a clearance between the bottom of the longitudinal partitions and the distributing means.
2. An air gravity classifier for loose materials, wherein a vertical separation chamber is interconnected with a device for building up gas upflow, said chamber being provided with longitudinal partitions dividing it into ducts, each of them incorporating a bank of elements for pouring and blowing through loose material located on the opposite walls along the length of the duct; a pipe for the delivery of loose material into the separation chamber whose outlet is located on the wall of one of the peripheral ducts; at least one chute with a perforated bottom for conveying and distribution of loose material in the ducts of the separation chamber located in the medium-length portion of the peripheral duct below the outlet of the pipe for the delivery of loose material with a clearance provided between at least one of its walls and a respective wall of the duct, said chute being fitted with its one end into the hole made in the wall of the duct provided by means of the partition and with the other end secured on the opposite wall, so that the geometric axis of the chute is arranged at an angle with the wall, thereby making the chute inclined towards the other peripheral duct; a pipe for separating small fractions of loose material in the gas flow positioned in the upper portion of the separation chamber; a pipe for separating large fractions of loose material located in the lower portion of the separation chamber with a grating for distributing the gas upflow duct-wise provided below the ducts with a clearance relative to the partitions.
3. An air gravity classifier for loose materials as claimed in Claim 2, wherein with chutes with a perforated bottom for conveying and distribution of loose material in the ducts of the separation chamber, each of said chutes is positioned in the respective duct of the separation chamber, its one end fitted into the hole made in the wall of the duct provided by means of a respective partition and the other end rigidly connected with the preceding chute, so that the geometric axis of each other chute in the direction from one peripheral duct to another is in line with the geometric axis of the preceding chute.
4. An air gravity classifier for loose materials as claimed in Claim 1 or 2, wherein each chute is provided with guide plates to fit the number of clearances between its walls and respective walls of the duct, each guide plate being positioned in a respective clearance along the chute with its one end secured on the wall and the free end facing the gas flow in this clearance.
5. An air gravity classifier for loose materials as 'claimed in any of Claims 1 to 4, substantiaily as described hereinabove with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8611724A FR2602699B1 (en) | 1986-08-13 | 1986-08-13 | PNEUMATIC CLASSIFIER FOR SEPARATION OF POWDERY MATERIALS BY GRAVITY |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8619404D0 GB8619404D0 (en) | 1986-09-17 |
| GB2193449A true GB2193449A (en) | 1988-02-10 |
Family
ID=9338292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08619404A Withdrawn GB2193449A (en) | 1986-08-13 | 1986-08-08 | Air gravity classifier for loose materials |
Country Status (4)
| Country | Link |
|---|---|
| AT (1) | AT386362B (en) |
| DE (1) | DE3626053A1 (en) |
| FR (1) | FR2602699B1 (en) |
| GB (1) | GB2193449A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2221631A (en) * | 1988-08-09 | 1990-02-14 | Uralsky Politekhn Inst | Gravity classifier for loose material |
| GB2231816A (en) * | 1989-05-23 | 1990-11-28 | Inco Ltd | Particle separator |
| EP1716936A1 (en) | 2005-04-26 | 2006-11-02 | Manuel Lindner | Device for separating heavy materials |
| CN104549702A (en) * | 2015-01-13 | 2015-04-29 | 福建省绿能环保科技有限公司 | Powder obtaining device in sand production |
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|---|---|---|---|---|
| DE3808116A1 (en) * | 1988-03-11 | 1989-09-21 | Bayer Ag | ZIGZAG SIFTER |
| AT391635B (en) * | 1988-07-29 | 1990-11-12 | Ural Polytekhnichesky I Im S M | GRAVITY SIGHTER |
| RU2451564C2 (en) * | 2010-07-06 | 2012-05-27 | Открытое акционерное общество "Катализатор" | Pneumatic classifier |
| RU2498867C1 (en) * | 2012-05-10 | 2013-11-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кемеровский технологический институт пищевой промышленности" | Grain air separator |
| RU2558062C1 (en) * | 2014-07-14 | 2015-07-27 | Государственное научное учреждение Всероссийский научно-исследовательский институт механизации сельского хозяйства Российской академии сельскохозяйственных наук (ГНУ ВИМ Россельхозакадемии) | Pneumatic separator of grain |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US1861248A (en) * | 1930-01-03 | 1932-05-31 | Albert H Stebbins | Air classifier |
| DE1482427B1 (en) * | 1959-06-05 | 1969-09-18 | Alpine Ag | Riser air separator with zigzag channel |
| DE2623038C2 (en) * | 1976-05-22 | 1978-04-20 | Alpine Ag, 8900 Augsburg | Riser air separator with zigzag channel |
| DE2648326C2 (en) * | 1976-10-26 | 1978-11-23 | Lindemann Maschinenfabrik Gmbh, 4000 Duesseldorf | Air separator |
| FR2371227A1 (en) * | 1976-11-17 | 1978-06-16 | Anvar | PROCESS FOR PLACING PHASES IN CONTACT WITH SUSPENSION AND NATURAL CIRCULATION OF AT LEAST ONE SOLID PRODUCT IN THE STATE DIVIDED IN A FLUID, AND EQUIPMENT FOR IMPLEMENTATION |
| SU787113A1 (en) * | 1979-01-09 | 1980-12-25 | Уральский ордена Трудового Красного Знамени политехнический институт им. С.М.Кирова | Gravitation classifyer |
| FR2543456B1 (en) * | 1983-04-01 | 1986-04-11 | Femia | METHOD AND DEVICE FOR GRAVIMETRIC AND AERODYNAMIC SEPARATION OF A HETEROGENEOUS MIXTURE OF BODY COMPRISING RESPECTIVELY DIFFERENT DENSITY PRODUCTS AND WASTE |
-
1986
- 1986-07-28 AT AT202986A patent/AT386362B/en not_active IP Right Cessation
- 1986-08-01 DE DE19863626053 patent/DE3626053A1/en active Granted
- 1986-08-08 GB GB08619404A patent/GB2193449A/en not_active Withdrawn
- 1986-08-13 FR FR8611724A patent/FR2602699B1/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2221631A (en) * | 1988-08-09 | 1990-02-14 | Uralsky Politekhn Inst | Gravity classifier for loose material |
| GB2231816A (en) * | 1989-05-23 | 1990-11-28 | Inco Ltd | Particle separator |
| US5073252A (en) * | 1989-05-23 | 1991-12-17 | Inco Limited | Pneumatic size separator for nickle-containing particles |
| GB2231816B (en) * | 1989-05-23 | 1992-10-14 | Inco Ltd | Particle separator |
| EP1716936A1 (en) | 2005-04-26 | 2006-11-02 | Manuel Lindner | Device for separating heavy materials |
| WO2006114302A1 (en) * | 2005-04-26 | 2006-11-02 | Manuel Lindner | Heavy material separator |
| US7819256B2 (en) | 2005-04-26 | 2010-10-26 | Manuel Lindner | Heavy material separator |
| CN104549702A (en) * | 2015-01-13 | 2015-04-29 | 福建省绿能环保科技有限公司 | Powder obtaining device in sand production |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3626053C2 (en) | 1988-09-01 |
| FR2602699B1 (en) | 1988-12-02 |
| FR2602699A1 (en) | 1988-02-19 |
| AT386362B (en) | 1988-08-10 |
| GB8619404D0 (en) | 1986-09-17 |
| ATA202986A (en) | 1988-01-15 |
| DE3626053A1 (en) | 1988-02-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |