JP5791863B2 - Granulated material transport method - Google Patents

Description

The present invention relates to a method for conveying a granulated material composed of a sintered raw material mainly composed of fine powder.

In recent years, in the sintering machine, the supply amount of iron ore such as hematite, which has been the mainstream in the past, has decreased, and porous content such as pisolite is high (for example, 3% by mass or more). The supply of iron ore, iron ore with a lot of crystal water, such as maramamba, porous and fine powder, and fine iron ore such as pellet feed is increasing.
Since such iron ore has more fine powder components than conventional iron ore (containing 60% by mass or more of particles having a particle diameter of 500 μm or less), it is installed in a sintering machine without pretreatment. If entered, it is difficult to efficiently produce sintered ore having good quality by inhibiting the air permeability of the sintering machine. For this reason, it was necessary to granulate such iron ore before charging it into the sintering machine.

Conventionally, sintered ore used as a raw material for blast furnaces is a mixture of powdered iron ore mixed with limestone and powdered coke, and further granulated by adding a binder composed of appropriate moisture and quick lime, etc. It was charged and manufactured.
In particular, in the case of iron ores with a high content of crystal water and porous iron ores, there are many fine ores with smaller particle sizes, and moisture for granulation is absorbed inside the pores of the porous iron ore. Therefore, the granulation property was poor, and the strength of the granulated sintered raw material (also referred to as pseudo particles) was low. Therefore, the granulated sintered raw material is dried using a conventionally known fluidized bed until the water content becomes 2 to 4% by mass to increase the crushing strength of the granulated product having an average particle size of 1 mm or more and 20 mm or less. , Was charged into the sintering machine.

On the other hand, between the fluidized bed and the sintering machine, the granulated material is used to prevent the sintering machine from stopping when the granulation process is stopped due to a transition from the belt conveyor to the belt conveyor or due to a temporary trouble. Is provided. Therefore, when the granulated material passes through the above-mentioned connecting part or is put into the hopper, due to the falling ore recovery device provided in the belt conveyor, equipment restrictions such as the size of the hopper, etc. The fall height of the granulated product increases (for example, about 2 to 10 m). For this reason, the phenomenon that the dried granulated material collapses occurs, and when these are supplied to the sintering machine, the air permeability of the sintering machine is hindered and the sintered ore having good quality can be efficiently obtained. There was a problem that it was difficult to manufacture.

Therefore, for example, in Patent Document 1, as shown in FIG. 7, when the sintered raw material (including the granulated material) discharged from the raw material hopper 80 through the roll feeder 81 is dropped onto the slowing chute 82. Discloses a method for preventing the destruction of pseudo particles by interposing a chute 83 having a variable angle (α: 0 to 30 degrees, for example). Thus, the impact of the pseudo particles falling on the sloping chute 82 is mitigated by interposing the chute 83. In FIG. 7, reference numeral 84 is a mineral formation, and reference numeral 85 is a pallet.
Further, although not a method for preventing the granulated material from collapsing, as a method for preventing the sinter ore from being pulverized, Patent Document 2 discloses a first pulley 91 and a first pulley 91 of a belt conveyor 90 as shown in FIG. By installing the carrier pulley 93 between the two pulleys 92, the tip height position of the belt conveyor 90 is made lower than the top part formed on the belt 94, and further, by providing a stepped guide part 95, A method for reducing the falling distance of the sinter and preventing the sinter from being pulverized is disclosed. In FIG. 8, reference numeral 96 denotes a conveyed product, and reference numeral 97 denotes another belt for connecting the conveyed product.

Japanese Patent Laid-Open No. 58-71341 JP 2001-233428 A

However, the conventional method still has the following problems to be solved.
The method of Patent Document 1 is an idea of reducing the collapse of a pseudo particle by rolling on a variable angle chute and reducing the collapse thereof. It was found that the pseudo particles slipped down on the chute when the temperature is higher than that, and the impact mitigation effect is reduced, resulting in a collapsed state almost the same as when there is no chute.
In addition, the pseudo particles described in Patent Document 1 are those in which fine powder is scattered around the core particles, and a sintered raw material with a large amount of fine powder containing 60% by mass or more of particles having a particle diameter of 500 μm or less is granulated. Since the disintegration form is different from the granulated product, there is a problem that the disintegration rate of the granulated product is increased even with the same strength. FIG. 9 shows the collapse of a granulated product (also referred to as a P-type granulated product) composed of fine powder and a pseudo particle (also referred to as an S-type granulated product) having fine particles attached around the core particle. Although the rate is shown, it can be seen that even if the pseudo particle and the granulated product have the same strength, the collapse rate when dropped from the same height is greatly different. Here, the decay rate is the rate of increase in the amount of particles of φ500 μm or less contained in the granulated product after dropping (hereinafter the same).

Further, Patent Document 2 is an idea that, by providing a carrier pulley, the falling height of the sintered ore is made lower than before, the impact at the time of dropping is alleviated, and the powder of the sintered ore is reduced. However, it cannot be applied when the drop height is fixed due to equipment restrictions. In addition, like sintered ore, it has a high strength of 5 MPa (50 kgf / cm ² ) or more, and when it is fired once and the grains are fused together, There is almost no generation | occurrence | production and a disintegration phenomenon differs from the dry granulated material which this invention makes object.
Even if the step-like guide is provided, sintered ore accumulates during use and a dead space is formed, resulting in the same function as the slowing chute shown in Patent Document 1. For this reason, there is a problem that the sintered ore slides down on the chute and the powdering suppression effect is reduced.

The present invention has been made in view of such circumstances, and suppresses the collapse of a granulated product that is granulated mainly with fine powder and has an average particle size and strength, and efficiently produces a sintered ore having good quality. It aims at providing the conveyance method of a possible granulated material.

The method for conveying a granulated product according to the present invention in accordance with the above object is to granulate by adding a binder to a sintering raw material containing 60% by mass or more of particles having a particle size of 500 μm or less , and then drying using a fluidized bed. A granulated material transport method for dropping a granulated material having an average particle size of 1 mm or more and 20 mm or less and a strength of 0.1 MPa or more and 1.5 MPa or less through a transport chute,
On the inner facing surface of the conveying chute, a drop impact buffering member for the granulated material is provided so as to protrude alternately with an interval in the dropping direction of the granulated product, and the drop impact buffer adjacent to each other in the vertical direction. The fall height of the granulated material between the members is within a range of 0.1 m or more and 0.4 m or less, and an overlap distance when the drop impact buffer members adjacent to each other in a plan view are 0 or more than 0 and the fall It should be within the range of half or less of the protruding length of the shock absorbing member.

In the method for transporting a granulated product according to the present invention, each of the drop impact buffering members is a flat plate, and the flat plate is inclined downward from the base side to the front side on the inner facing surface of the transport chute. It is preferable that the inclination angle with respect to the horizontal position is within a range of 30 degrees or more and 45 degrees or less.
In the method for transporting a granulated product according to the present invention, it is preferable that each of the drop impact buffering members is a flat plate, and the flat plate is horizontally attached to the inner facing surface of the transport chute.
In the method for conveying a granulated product according to the present invention, it is preferable that the drop impact buffer members are attached at equal pitches in the dropping direction of the granulated product.

The method for conveying a granulated product according to the present invention includes a drop impact on an inner facing surface of a transport chute for dropping a granulated product having an average particle size of 1 mm to 20 mm and a strength of 0.1 MPa to 1.5 MPa. The buffer member is provided so as to protrude alternately with a gap in the falling direction of the granulated material, and the fall height of the granulated material between the upper and lower adjacent drop impact buffer members is in the range of 0.1 m to 0.4 m. Since it is inside, the collapse of the granulated product when the granulated product falls can be suppressed. This is the minimum impact at which the granulated product collapses by prescribing the drop height of the granulated product per time when dropping the granulated product whose average particle size and strength are defined as described above, That is, it can be adjusted below the critical impact that is difficult to collapse even when dropped.
Here, since the overlap distance when the top and bottom adjacent drop impact buffer members are viewed in plan is within the range of 0 or more than 0 and less than half of the projection length of the drop impact buffer member, It can drop while passing through the shock absorbing member (through all the drop shock absorbing members).
Therefore, by supplying the granulated material thus conveyed to the sintering machine, a sintered ore having good quality can be efficiently produced without impairing the air permeability of the sintering machine.

In addition, when each drop impact buffer member is a flat plate and attached to the inner facing surface of the transport chute at a predetermined inclination angle downward, the granulated material does not accumulate on each drop impact buffer member. The granulated product can be continuously and stably dropped.
If each drop impact buffer member is a flat plate and is mounted horizontally on the inner facing surface of the conveying chute, the granulated material is deposited on the upper surface of each drop impact buffer member to form an inclined surface of a predetermined angle. To do. As a result, the granulated material falls and rolls down on the inclined surface formed by the accumulated granulated material without colliding with each of the drop impact buffer members, thereby suppressing the wear and wear of each drop impact buffer member. This can reduce the maintenance frequency and running cost of each drop impact buffer member.
Furthermore, when each drop impact buffer member is attached at an equal pitch in the dropping direction of the granulated product, the configuration of the conveying chute can be simplified.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is an explanatory view of a transport chute used in the method for transporting a granulated product according to one embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the relationship between the collapse rate of the granulated product and the drop height. FIG. 3 is an explanatory view of the disintegration mechanism of the granulated product, and FIGS. 4 (A) and 4 (B) are explanatory views of a transport chute used in the method of transporting the granulated product according to another embodiment of the present invention. It is explanatory drawing of a use condition.

As shown in FIG. 1, the method for conveying a granulated product according to an embodiment of the present invention includes adding a binder to a sintering raw material containing 60% by mass or more of particles having a particle size of 500 μm or less, granulating and drying the material. In this method, the granulated product 10 having an average particle diameter of 1 mm to 20 mm and a strength of 0.1 MPa to 1.5 MPa is dropped via a transport chute 11. The conveying chute 11 is configured to convey the granulated product 10 in order to prevent the sintering machine (not shown) from stopping when the granulation process is stopped due to a temporary trouble with the belt conveyor 12. It is provided between the hopper 13 to store. In addition, the distance from the upper surface (conveyance surface) position of the belt conveyor 12 to the bottom surface position of the hopper 13 is, for example, about 3 m or more and 10 m or less.

The inventors of the present application have studied in order to solve the above-mentioned problems, and even if the same granulated product, pseudo particles (S-type granulated product) are granulated by attaching fine powder around the core particles. ) And a granulated product without a core particle (P-type granulated product), attention was paid to the fact that the fracture mode is different.
As described above, FIG. 9 shows the disintegration rate with respect to the drop impact of the pseudo particles and the granulated product. Even if the pseudo particles and the granulated product have the same strength, the granulated product is compared with the pseudo particles. And the collapse rate is high.
This is because the fracture mode differs depending on the size of the particles constituting the pseudo particles and the granulated product. Specifically, the minimum impact for disintegrating the pseudo particles and the granulated material is determined depending on the composition of the particles, and when the impact is below the critical impact (here, equivalent to the critical drop height), This is because things do not collapse.

In FIG. 2, the relationship between the fall height of a granulated material and a disintegration rate is shown. As the granulated product, a sintered raw material containing 65% by mass of particles having a particle size of less than 500 μm was granulated and dried to obtain an average particle size of 5 mm and a strength of 0.6 MPa.
As can be seen from FIG. 2, it can be seen that the fall rate of the granulated product increases as the drop height of the granulated product increases. This is thought to be because the impact energy is proportional to the fall height of the granulated product. From this, even if the fall height of the granulated product per time is reduced, the total fall height is the same. If there was, it was thought that it would be the same collapse rate.
However, as a result of repeated studies, the present inventors have found that there is a limit drop height at which the granulated material does not collapse. And it turned out that limit fall height can be estimated by the intensity | strength of a granulated material, and the particle size structure of a granulated material.
Based on these, the invented conveying method that can suppress the collapse of the granulated product. This will be described in detail below.

Sintered raw materials that make up the granulated material contain 60% by mass or more of particles having a particle size of 500 μm or less, for example, raw materials that contain a large amount of fine powder, raw materials that have been adjusted to the above-mentioned configuration by screening, and only fine powder is separated by screening. Raw materials, and further pulverized raw materials can be used.
This sintering raw material is, for example, limonite (Fe ₂ O ₃ .nH ₂ O), magnetite (Fe ₃ O ₄ ), and hematite (Fe ₂ O ₃ ), serpentine, limestone, powder coke, reverse ore, and Any one or more of the kneaded dust. The limonite includes, for example, maramamba ore (local brand: West Angelus), pisolite ore (local brand: Yandhi, Loeb River), and high phosphorus block man ore.

As a raw material for sintering, a raw material containing particles having a particle size of more than 0 μm and under 500 μm in an amount of 60% by mass or more is used. This is because even an enhanced granulated product is significantly collapsed when dropped as described above, resulting in a decrease in sinterability.
For this reason, the present embodiment is intended for granulation of a sintering raw material containing particles having a particle size of 500 μm or less, 60 mass% or more, preferably 70 mass% or more, and more preferably 80 mass% or more. The reason why the upper limit of the amount of fine powder is not specified is that all fine powder may be used.

Since the binder contributes to the improvement of the strength of the granulated product, an inorganic binder such as quick lime or limestone conventionally used can be used. In addition, as a binder, any one of an organic binder containing pulp waste liquor or starch (aqueous solution or colloidal form), and a dispersant (including an aqueous solution or a colloid added with a dispersing agent) that promotes solid crosslinking. Alternatively, it is preferable to use 2, but it may be used in combination with an inorganic binder.
The amount of binder added may be about 1% by mass or less with respect to the sintered raw material.

These are put into a granulator (for example, drum type granulator), granulated, and then dried.
In addition, as a method of drying a granulated material, the band dryer which ventilates in a stationary state can suppress the collapse of the granulated material, and is the best, but a fluidized bed is preferable as a method of drying more efficiently. This is because the collapse of the granulated product can be sufficiently suppressed by the gas cushion effect. Here, the method of applying a mechanical impact such as a kiln is remarkably collapsed and is difficult to apply.
Thereby, the average particle diameter of the granulated product is 1 mm or more and 20 mm or less, and the strength is 0.1 MPa (1 kgf / cm ² ) or more and 1.5 MPa (15 kgf / cm ² ) or less.

Here, the average particle size of the granulated product is defined to be 1 mm or more and 20 mm or less because the granulated product of less than 1 mm has a concern of impairing the air permeability in the sintering bed of the sintering machine, while 20 mm This is because a granulated product having a particle size exceeding 1 is so large that the granulated product may be insufficiently fired.
From the above, the average particle diameter of the granulated product is set to 1 mm or more and 20 mm or less, but the lower limit is preferably 3 mm, more preferably 5 mm, and the upper limit is preferably 17 mm, more preferably 15 mm.

The reason why the strength of the granulated product is regulated to 1.5 MPa or less is that, for example, about 2 to 4% by mass of water remains in the granulated product dried in the fluidized bed. As described above, when moisture remains in the granulated product, it is difficult to achieve a strength exceeding 1.5 MPa, and as a result, the collapse at the falling part tends to be remarkable, and the air permeability in the sintering machine is hindered. This is because there is a problem. On the other hand, the reason why the strength is set to 0.1 MPa or more is that when the strength is less than 0.1 MPa, the fluidized bed collapses during drying and cannot be discharged from the fluidized bed.
From the above, the strength of the granulated product is set to 0.1 MPa or more and 1.5 MPa or less, but the lower limit is preferably 0.3 MPa, and more preferably 0.5 MPa.

The granulated product 10 thus manufactured is transported from the belt conveyor 12 to the hopper 13 via the transport chute 11.
The transport chute 11 is a hollow one placed upright on the hopper 13, and a flat plate (drop impact buffer member) that softens the drop impact of the granulated product 10 on the inner facing surfaces 14 and 15 of the transport chute 11. An example) 16 is provided to protrude alternately with an interval in the dropping direction of the granulated material. The flat plates 16 are provided at the same interval (same pitch) in the dropping direction of the granulated material, but may be provided at partially different intervals.

The flat plate 16 is attached to the inner facing surfaces 14 and 15 of the conveying chute 11 so as to be inclined downward from the base side to the front side. The inclination angle θ is not particularly limited, but the inclination angle θ with respect to the horizontal position is preferably in the range of 30 degrees to 45 degrees. The inclination angles θ of the flat plates 16 are preferably all the same, but may be partially different.
As described above, by setting the inclination angle θ of each flat plate 16 to 30 degrees or more and 45 degrees or less, the granulated material dropped on the flat plate 16 is stably dropped downward without staying on each flat plate 16. be able to.

Moreover, the fall height H of the granulated product between the flat plates 16 adjacent to each other in the falling direction of the granulated product is in the range of 0.1 m or more and 0.4 m or less.
Here, the fall suppression effect by limit fall height is acquired by making fall height H per granulation into 0.4 m or less. On the other hand, when the drop height H is less than 0.1 m, the interval between adjacent flat plates is too narrow and closed, and the distribution of the granulated material cannot be performed stably.
The limit drop height will be described in detail with reference to FIG. 3 showing the concept.
The collapse of the granulated material is governed by the impact (drop energy) due to the fall. On the other hand, the strength of the granulated material acts as resistance (resistance energy) that suppresses collapse, and in fact, the difference between the two (fall energy and resistance energy) becomes the effective fracture index (effective fracture energy).

Here, in the case of a granulated material having a strength of 1.5 MPa or less in which 2 to 4% by mass of water remains, a connecting height of a general belt conveyor (for example, about 2 m) and a feeding height to a hopper (for example, 5m), the difference between the two is negligibly small and hardly contributes to the suppression of the collapse of the granulated product. However, if the fall height of the granulated material is lowered, the resistance of the granulated material cannot be ignored as shown in FIG.
The drop height at this time was defined as the limit drop height Hc.
According to the experiments by the inventors of the present application, it has been clarified that the limit drop height is influenced by the strength of the granulated product and the particle size constituting the granulated product, and the pseudo particles and the granulated product are greatly different. . In addition, in the granulated product containing 60% by mass or more of particles having a particle size of 500 μm or less, the average particle size of which is 1 mm to 20 mm, and the strength is 0.1 MPa to 1.5 MPa, shown in FIG. Thus, it was 0.4 m.

In addition, the overlapping distance W in the plan view of the upper and lower adjacent flat plates 16 attached to the inner facing surfaces 14 and 15 of the transport chute 11 exceeds 0 or 0, and is from the inner facing surfaces 14 and 15 of the flat plate 16. It is within the range of half or less of the protrusion length L.
The reason why the lower limit of the overlap distance W is set to 0 m is to make sure that the granulated material falling from the upper flat plate is dropped onto the flat plate arranged below. On the other hand, the reason why the upper limit of the overlap distance W is set to be equal to or less than half of the protrusion length L of the flat plate is to allow the granulated material to drop stably without being retained between the upper and lower adjacent flat plates.
From the above, the overlap distance W of the flat plate 16 is set to 0 or more than 0 and less than half of the protrusion length L of the flat plate 16, but the lower limit is 0.1 × L, and further 0.2 × L And the upper limit is preferably 0.4 × L, more preferably 0.3 × L.

Next, a transport chute used in the method for transporting a granulated product according to another embodiment of the present invention will be described.
The conveying chute 17 shown in FIG. 4 (A) is a hollow one placed upright on the hopper 13, and a drop impact of the granulated product 10 is applied to the inner facing surfaces 18 and 19 of the conveying chute 17. Reducing flat plates (an example of a drop impact buffering member) 20 are provided so as to protrude alternately with the same interval (at the same pitch) in the dropping direction of the granulated product. Each flat plate 20 is horizontally attached to the inner facing surfaces 18 and 19 of the conveying chute 17. Here, the term “horizontal” includes within a range of ± 10 degrees and further ± 5 degrees with respect to the horizontal position.

When the granulated product is dropped by using the transport chute 17, since each flat plate 20 is in a horizontal state, the granulated product is deposited on the upper surface of each flat plate 20. And the granulated material deposited on each flat plate 20 forms the inclined surface which has a predetermined angle of repose (30-40 degree | times).
Thereby, since the granulated material falls on the inclined surface formed by the accumulated granulated material and does not collide with the surface of each flat plate 20, it can suppress wear and wear of each flat plate 20, The maintenance frequency and running cost of each flat plate 20 can be reduced.
From the above, by using the method for conveying a granulated product of the present invention, it is possible to suppress the collapse of the granulated product due to falling, so by supplying this granulated product to a sintering machine, good quality can be obtained. It is possible to efficiently produce the sintered ore.

Next, examples carried out for confirming the effects of the present invention will be described.
Here, a sintering raw material containing 65% by mass of particles having a particle size of 500 μm or less is put into a drum granulator, and water and an organic binder are added thereto to granulate, followed by drying using a fluidized bed. Then, the collapse rate (increase amount of φ500 μm or less) before and after the conveyance of the obtained granulated product having an average particle diameter of 5 mm and a strength of 0.4 MPa was examined.

First, the result of examining the drop height of the granulated material between adjacent flat plates provided on the conveyance chute will be described with reference to FIGS. 5 (A) and 5 (B). In addition, in FIG. 5 (A), the fall height per one time (gap of flat plates) of the granulated product is 6 m (no flat plate), 1 m, 0.6 m, 0.4 m, and 0.3 m. Fig. 5 (B) shows the image when the granulated product falls, and in Fig. 5 (B), the collapse rate when the granulated product falls 6m (6m x 1 time) and the total of the granulated product are shown. The relationship with the collapse rate at the time of changing the fall height per time when dropping 6 m is shown. Here, the flat plate provided in the conveyance chute is provided in a horizontal state without being inclined, and at an equal pitch in the dropping direction of the granulated product. FIG. 5B also shows the collapse rate when the fall height other than the image shown in FIG. 5A is changed.

As is clear from FIG. 5 (B), when dropping the granulated product for 6 m, the drop height per time is low, such as 6 m once, 1 m 6 times, and 0.6 m 10 times. By doing so, the disintegration rate per one time was reduced, but the disintegration rate of the granulated product when it dropped a total of 6 m was the same.
However, as shown in FIG. 5 (B), when the drop height per time is further lowered to 0.4 m (15 times) and 0.3 m (20 times), the structure when a total of 6 m is dropped. It was confirmed that the particle disintegration rate decreased.
This is because of the influence of the resistance of the granulated material described above, and the influence of the resistance of the granulated material cannot be ignored by reducing the drop height.

The phenomenon described above appeared in the same manner in a granulated product containing particles having a particle size of less than 500 μm in an amount of 60% by mass or more, an average particle size of 1 mm to 20 mm, and a strength of 0.1 MPa to 1.5 MPa. .
In the sintering machine, decay rates of the granulated product, i.e. φ500μm following increase rate contained in the granulated product in after the drop until 7% by weight, Enoi given a significant impact on operations.
In view of the above, when dropping a granulated product having an average particle size of 1 mm or more and 20 mm or less, including particles having a particle size of 500 μm or less and having an average particle size of 1 mm or more and 20 mm or less, granulation If the fall height per time of a thing is 0.4 m or less, it has confirmed that the collapse inhibitory effect of a granulated thing was notably acquired.

Next, the method of dropping the granulated product and the results of examining the collapse rate of the granulated product at that time will be described with reference to FIGS. 6 (A) and 6 (B). The conveying chute shown in FIG. 6 (A) is provided between a belt conveyor that conveys the granulated material and a hopper that stores the granulated material, and its drop height is 5 m. Here, the conventional example is a result when the granulated product is dropped freely by 5 m without using a flat plate, and the comparative example is a granulated product in which a chute having an inclination angle of 60 degrees is provided in the transport chute. In this example, flat plates with an inclination angle of 40 degrees with respect to the horizontal position are provided in multiple stages in the dropping direction of the granulated product, and the dropped height of the granulated product between adjacent flat plates Is the result when the overlapping distance of the flat plate when viewed in plan is 0.1 times the protruding length of the flat plate.

As is clear from FIG. 6 (B), the comparative example using one chute compared with the conventional example in which the granulated product was allowed to fall freely by 5 m hardly obtained the granule collapse suppression effect. .
On the other hand, by setting the fall height of the granulated product within the appropriate range shown in the embodiment as in the examples, the disintegration rate of the granulated product can be reduced to 2% by mass, and the large collapse It was confirmed that an inhibitory effect was obtained.
From the above, by applying the method for conveying a granulated product of the present invention, it is possible to suppress the collapse of the granulated product having a defined average particle size and strength that are mainly composed of fine powder, and to achieve good quality. It was confirmed that the sintered ore having this could be produced efficiently.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where the granulated product transport method of the present invention is configured by combining a part or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
Moreover, in the said embodiment, although the case where the conveyance chute was provided between the belt conveyor which conveys a granulated material, and the hopper which stores this granulated material was demonstrated, a granulated material falls It is not limited to this as long as it is a place, and for example, it may be provided at a connecting portion from a belt conveyor that conveys the granulated material to the belt conveyor.

It is explanatory drawing of the chute for conveyance used for the conveyance method of the granulated material which concerns on one embodiment of this invention. It is explanatory drawing which shows the relationship between the collapse rate of a granulated material, and fall height. It is explanatory drawing of the disintegration mechanism of a granulated material. (A), (B) is explanatory drawing of the chute for conveyance used for the conveying method of the granulated material which concerns on other embodiment of this invention, respectively, and explanatory drawing of a use state. (A) is explanatory drawing of the image at the time of fall of a granulated material, (B) is explanatory drawing which shows the relationship between the fall height per time when a granulated material falls 6m, and its collapse rate. (A), (B) is explanatory drawing which shows the relationship between the conveyance method of the granulated material which concerns on an Example, and the collapse rate of a granulated material. It is explanatory drawing of the apparatus which applies the destruction prevention method of the pseudo particle which concerns on a prior art example. It is explanatory drawing of the apparatus which applies the powdering prevention method of the sintered ore concerning a prior art example. It is explanatory drawing which compared the relationship between the fall height of a quasi-particle and granulated material, and a disintegration rate.

Explanation of symbols

10: Granulated product, 11: Transport chute, 12: Belt conveyor, 13: Hopper, 14, 15: Inside facing surface, 16: Flat plate (drop impact buffer member), 17: Transport chute, 18, 19: Inside Opposing surface, 20: flat plate (drop impact buffer member)

Claims (4)

After granulated particles having a particle diameter of 500μm under the addition of a binder in a sintering raw material containing 60 mass% or more, fluidized bed and dried with an average particle diameter of 1mm or more 20mm or less, the strength more than 0.1MPa A granulated material transport method for dropping a granulated material having a pressure of 1.5 MPa or less through a transport chute,
On the inner facing surface of the conveying chute, a drop impact buffering member for the granulated material is provided so as to protrude alternately with an interval in the dropping direction of the granulated product, and the drop impact buffer adjacent to each other in the vertical direction. The fall height of the granulated material between the members is within a range of 0.1 m or more and 0.4 m or less, and an overlap distance when the drop impact buffer members adjacent to each other in a plan view are 0 or more than 0 and the fall A method for conveying a granulated product, characterized in that it is within a range of half or less of the protruding length of the impact buffering member. 2. The method for conveying a granulated product according to claim 1, wherein each of the drop impact buffering members is a flat plate, and the flat plate is inclined downward from the base side to the front side on the inner facing surface of the transfer chute. The method for conveying a granulated product is characterized in that it is attached and the inclination angle with respect to the horizontal position is in the range of 30 degrees to 45 degrees. 2. The granulated material conveying method according to claim 1, wherein each of the drop impact buffering members is a flat plate, and the flat plate is horizontally attached to the inner facing surface of the conveying chute. How to transport things. The method for conveying a granulated product according to any one of claims 1 to 3, wherein each of the drop impact buffer members is attached at an equal pitch in a dropping direction of the granulated product. Grain transport method.

Images