JP3024486B2 - How to transport sintering raw materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for supplying a sintering raw material to a sintering raw material pretreatment step (granulation step).

[0002]

2. Description of the Related Art Generally, as shown in FIG. 7, in the processing steps from cutting of a sintering raw material to blending and granulation, each raw material is supplied to a predetermined hopper 1 provided for each brand of sintering raw material. It is continuously cut out at the compounding ratio, and is sequentially stacked and transported from below on one conveyor belt 2 installed at the lower part of the storage hopper 1. After the transported raw materials are uniformly mixed in the mixing step 3, the raw materials are fed to the granulation step 4 to produce a sintering compound raw material. During this time, a belt conveyor may be connected in some cases.

[0003] In recent years, in the production method of sinter ore, in order to increase the distribution of inferior raw materials and reduce the production energy, not all the raw materials are granulated at once when granulating the sinter raw materials.
Applying the two-part granulation method, in which the raw materials are divided into groups according to their brands, then granulated separately, and then mixed and sintered, or after pre-granulating only specific raw materials, and then adding the remaining raw materials to pre-granulate The application of a pre-granulation method for coating around a granule is actively performed. On the other hand, a two-stage charging technique in which two types of different compounding raw materials are prepared, separately charged into a pallet of a sintering machine in two upper and lower stages, and fired, is also performed.

[0004]

Although such a sintering method is technically a more advanced sintering technique, it requires at least two or more different raw material transport lines in the granulation process in practice. For this reason, there are problems such as an increase in equipment costs and an inability to secure an additional space.

As a means for solving these problems, for example, a method has been proposed in which raw materials having different blends are alternately transported according to a time schedule using a single series of conveyor lines. Problems, such as the necessity of hopper equipment and the like corresponding to it, the need for time allowance in the time schedule, and the necessity of an expensive control device for each switching. There are many.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem in the related art, and it is possible to improve the structure of a single belt conveyor without adding a new raw material transport conveyor. An object of the present invention is to propose a method of transporting a sintering raw material that can collect and transport different raw materials to the next step.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a method for transporting raw materials in a sintering raw material pretreatment, wherein a plurality of types of raw materials are continuously cut out on a single belt conveyor and the height of the raw materials is sequentially reduced.
In the process of laminating and conveying in the direction, the raw material on the belt conveyor at the end of the belt conveyor is divided into upper and lower layers.
Divided into two groups and collected on separate unloading conveyors
Then, in the raw material processing in the next step, the upper layer part and the lower layer part
The transport method of sintering material, characterized by feeding the group of raw materials in different locations and gist was or, as a means for separating and recovering a raw material on the belt conveyor into upper and lower layers, the belt conveyor upper Of collecting the raw material of the belt part by suction method, providing a chute divided into front and rear at the end of the belt conveyor, and separating the raw material layer on the belt conveyor into two upper and lower layers in the height direction through a separation plate And a method in which each raw material in the upper layer portion is dropped on each of the front and rear chutes.

[0008]

In the present invention, the raw materials continuously and sequentially cut out from the ore storage hopper for each brand are transported in a form stacked from bottom to top on one belt conveyor. At the end of the belt conveyor, there is provided a device for separating the raw material layer into a lower layer and an upper layer at the end of the belt conveyor. Separation into two groups and collection on separate transport lines can be adopted.

As a means for separating and recovering the raw material on the belt conveyor into two upper and lower layers, in the case of recovering the raw material in the upper layer of the belt conveyor by a suction method, only the raw material in the upper layer is sucked at the end of the belt conveyor. The remaining lower layer material is discharged as it is at the terminal end.

In the case of a system in which each raw material in the lower layer and the upper layer is dropped onto each of the front and rear chutes via a separation plate which divides the raw material layer on the belt conveyor into upper and lower layers in the height direction, The upper layer material on the conveyor falls on the chute farther from the belt on the separation plate, and the lower layer material falls on the chute on the front side of the belt. In addition, as for the raw material on the belt conveyor, the raw material of the upper layer falls farther than the belt at the end of the conveyor, and the raw material of the lower layer falls before the belt, so it is necessary to provide front and rear chutes according to the release and fall locus. Thus, the upper layer raw material and the lower layer raw material can be separated and recovered, so the separation plate is not always necessary. However, it is preferable to provide the separation plate in consideration of the separation accuracy.

The raw materials separately collected in the upper layer and the lower layer at the end of the belt conveyor are fed to different places for each raw material group, for example, a granulation step or a mixing step, on separate transport lines.

In the grouping of the raw materials to be separated and recovered according to the present invention, the raw materials are grouped according to the order of the raw materials cut out on the belt conveyor, and thus are determined by the location of the raw material brand to be distributed to the storage hopper. You.

[0013]

EXAMPLE 1 FIG. 1 is a schematic diagram showing the overall apparatus configuration example for implementing the present invention method, Fig. 2 is an explanatory view of a stacked embodiment of the material on the belt conveyor, the raw materials up and down FIG . 3 to FIG. 6 illustrate a means for separating and recovering the raw material on the belt conveyor into two upper and lower layers, and FIG. 3 to FIG. 6 show a separation and recovery according to claim 3 of the present invention. FIG. 4 is a schematic view showing a separation and recovery apparatus according to the fourth embodiment, and FIG. 5 is a schematic view showing another embodiment of the present invention.
(A) is a schematic side view, (B) is a schematic plan view, and FIG. 6 is a schematic view showing another embodiment of the present invention, wherein 20 is a belt conveyor, 21 is a separation and recovery device, 22 is a suction duct, 2
3 is a suction fan, 24 is a chute, 25 is a separation plate, 26
Is a scraping plate, 27 is a feed belt, 28 is a scraper,
a and b are carry-out conveyors, A is a raw material in the upper layer, and B is a raw material in the lower layer.

In FIG. 1, each raw material is continuously cut out at a predetermined mixing ratio from an ore storage hopper 1 provided for each brand of sintering raw material, and one raw material is installed at the lower part of the ore storage hopper 1. Are transported in such a form that they are sequentially stacked from bottom to top on the belt conveyor 20. The raw materials 5 continuously cut from the ore storage hopper 1 are vertically stacked on a belt conveyor 20 as shown in FIG.

The raw materials transported in a stacked state on one belt conveyor 20 are separated into an upper raw material A and a lower raw material B by a separation and recovery device 21 installed at the end of the conveyor. Each of them is fed to a predetermined place in the mixing step 3 or the granulation step 4 on separate transport lines,
Split granulation, preliminary granulation, or granulation of two types of separately blended raw materials are performed.

Next, the separation and recovery device shown in FIGS. 3 to 6 will be described. First, the separation / recovery apparatus shown in FIG. 3 employs a so-called suction system, in which a suction duct 22 connected to a suction fan 23 is installed at the end of the belt conveyor 20 so that the raw material A in the upper layer can be supplied to the suction fan 23. Thus, the material B is sucked and discharged through the suction duct 22 and collected by the unloading conveyor a, while the raw material B in the lower part is discharged as it is from the terminal end of the conveyor and collected by the unloading conveyor b.

The separating and collecting apparatus shown in FIG. 4 has a structure in which a chute 24 divided into front and rear portions is installed at the end of the belt conveyor 20, and a separation plate 25 is provided above the chute.
The raw material on the belt conveyor 20 falls through the separation plate 25, and the raw material A in the upper layer falls to the chute 24-1 farther from the belt and the raw material B in the lower layer falls on the front chute 24-2 and is separated and collected. . Although the separation and recovery can be performed without the separation plate 25, the separation plate 25 can separate and collect the raw materials in the upper layer portion and the lower layer portion more accurately.

In the separation and recovery apparatus shown in FIG. 5, a raw material scraping plate for scraping only the upper layer material in the belt width direction is provided immediately before the end of the belt conveyor, and only the upper layer material is scraped to the side of the belt conveyor. The structure is such that a raw material scraping plate 26 is installed at a predetermined height position in accordance with the raw material layer thickness at a predetermined angle with respect to the belt conveyor 20 immediately before the end of the belt conveyor 20. Of the raw materials transported by the conveyor 20, only the upper raw material A is scraped laterally on the belt conveyor 20 by the raw material scraping plate 26 and separated from the lower raw material B. The upper layer raw material A scraped by the raw material scraping plate 26 is collected by the unloading conveyor a installed below the lower layer raw material A, and the lower layer raw material B is discharged from the terminal end of the belt conveyor 20 and is lowered. Installed unloading conveyor b
Collected at

In the separation / recovery apparatus shown in FIG. 6, a feed belt is disposed so as to sandwich the upper layer material from above immediately before the end of the belt conveyor, and the raw material layer on the belt conveyor is arranged below the feed belt in the vertical direction. The upper layer material is dropped between the scraper and the outer layer by the scraper divided into two layers and the feed belt, and the feed belt 27 is driven by a motor at the end of the belt conveyor 20.
And a scraper 28 for dividing the raw material layer on the belt conveyor into upper and lower layers, and a feed belt 27 and a scraper 28.
Feed belt 2 while sandwiching the upper layer of raw material A between
In the method of discharging the material B to the outside of the scraper 28 by the force of 7, the raw material B in the lower part is discharged as it is from the terminal end of the conveyor.

EXAMPLE 2 Raw materials are cut out by brand from the ore storage hopper 1 shown in FIG. 1 and each raw material is vertically stacked on a belt conveyor shown in FIG. 2 (A), and shown in FIGS. 3 to 6 at the end of the conveyor. C of the raw material when the raw material on the belt conveyor was recovered by dividing the raw material on the belt conveyor into upper and lower parts under the raw material blending and raw material cutting conditions shown in Table 1
aO component and F. Table 2 shows the analysis results of the C (fixed carbon) component. In Table 2, the separation / recovery weight ratio of the upper and lower layers is obtained by measuring the weight of all raw materials separated and recovered for the upper and lower layers.
It is a value calculated based on this. CaO and F.I. C was analyzed by a chemical analysis method according to the JIS method.

In the case of the separation and recovery apparatus shown in FIG. 3, the suction force of the suction fan 23 in the raw material recovery section was adjusted so that only the coke breeze (mixing ratio 4%) could be recovered as the upper layer raw material. As a result, Test No. As shown in 1,
The separation / recovery weight ratio of the lower layer was 4% for the upper layer and 96% for the lower layer, and the recovery weight ratio was about the target value. A in this case
CaO obtained by chemical analysis in raw material (upper part raw material)
(%) Is 0.1%, and CaO (%) in the B raw material is 9.6.
%, Likewise F.A. C (%) is 80.1%, and F. C (%) is 0.4%, which indicates that only coke breeze can be accurately separated and recovered as the raw material A.

Next, a test was carried out by adjusting each separation and recovery apparatus so that 40% of the raw material could be separated and recovered as the upper layer. The upper / lower layer separation / recovery weight ratio is 40% for the upper layer and 6 for the lower layer.
A recovery rate of 0%, which is equal to the target value, was obtained in any of the recovery methods. Further, CaO (%), F. The chemical analysis value of C (%) also has a clear difference between the upper layer and the lower layer, and can be separated and recovered almost according to the target value predicted from the compounding calculation. It indicates that it is possible.

From these results, it was confirmed that according to the method of the present invention, the cut-out raw material can be effectively separated and recovered, although the target raw material is slightly mixed with the separated raw material.

[0024]

[Table 1]

[0025]

[Table 2] Material A: upper layer material, Material B: lower layer material

[0026]

As described above, according to the present invention,
By devising a single belt conveyor, it is possible to use multiple types of raw materials without installing a new raw material transport conveyor.
Can be separated into two groups, an upper layer part and a lower layer part, and can be transported to the next step. Therefore, the sintering raw material can be pretreated without significant capital investment (for example, the post-addition method of powdered coke, CaO Component granulation method, pre-granulation method of fine powder raw material, etc.).

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of an overall apparatus configuration for carrying out a method of the present invention.

[2] an explanatory view of a stacked embodiment of the material on the belt conveyor, schematic longitudinal sectional view showing a stacked state raw material up and down
It is.

FIG. 3 is a schematic view showing a separation and recovery apparatus according to a third aspect of the present invention.

FIG. 4 is a schematic view showing a separation and recovery apparatus according to a fourth aspect of the present invention.

FIG. 5 is a schematic view showing an apparatus according to another embodiment of the present invention;
(A) is a schematic side view, (B) is a schematic plan view.

FIG. 6 is a schematic view showing a device according to another embodiment of the present invention.

FIG. 7 is a schematic diagram showing processing steps from cutting out of a general sintering raw material to blending and granulation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mineral storage hopper 2 Conveying belt 3 Mixing process 4 Granulation process 5 Raw material 20 Belt conveyor 21 Separation and recovery device 22 Suction duct 23 Suction fan 24 Chute 25 Separation plate 26 Scrapping plate 27 Feed belt 28 Scraper a, b Unloading conveyor A Upper layer Raw material B Raw material of lower layer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65G 47/64-47/78 B65G 47/44 B65G 47/95

Claims (3)

(57) [Claims] In a method of transporting raw materials in a sintering raw material pretreatment, a plurality of types of raw materials are continuously cut out on a single belt conveyor, sequentially stacked in a height direction, and conveyed, and the belt conveyor end portion is formed. The belt conveyor
A.The raw material on the upper part is divided into two groups, upper part and lower part.
Each collected in separate unloading conveyor, hit the raw material processing of the next step, it feedstock two groups of the upper portion and the lower portion
A method for transporting sintering raw materials, wherein the raw materials are sent to different places. As claimed in claim 2 wherein the means for separating and recovering material on the belt conveyor into upper and lower layers, a method of transporting a sintered material according to claim 1, characterized in that the recovery of the raw material of the belt conveyor upper part by a suction method . 3. As means for separating and collecting the raw material on the belt conveyor into two upper and lower layers, a chute divided into front and rear is provided at the end of the belt conveyor, and the raw material layer on the belt conveyor is divided into two upper and lower layers in the height direction. transportation method of the sintered material of claim 1, wherein the through separator plate is characterized by using a method of dropping the raw materials of the lower layer portion and the upper portion on each chute before and after each of partitioning.