JPH0559971B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a raw material loading method in a blending yard.

(Prior Art) There are as many as 20 to 30 types of main raw materials for sintered ore, and in order to stabilize the quality of sintered ore, it is necessary to thoroughly mix these various raw materials in advance in a blending yard. The method of loading raw materials in such a blending yard is shown in outline in Figure 1, and once various raw materials are stored in the storage hopper 1,
This is quantitatively cut out from each hopper 1 and transferred to a betting stacker 3 using a belt conveyor 2.
(hereinafter simply referred to as Statzker). The stacker 3 reciprocates within a set range of a blending yard (hereinafter simply referred to as the yard), and the amount of raw material cut out from each hopper 1 is determined by the moving speed of the stacker 3. The thickness of the raw materials (loaded amount of raw materials) will be stacked in the yard.

The raw materials piled up in this manner are discharged by a double-wheel reclaimer 4 as shown in FIG. 2 in the following manner. That is, by reciprocating the two bucket foils 5, 5 installed at a constant interval L in the width direction of the mountain, and rotating the bucket foils 5, 5 themselves to move them to the sides in the width direction of the mountain. , and unload the stowed raw materials. With this method, bucket foil 5.5
When the position is X or Z, the raw material group G stacked on the side part of the pile and the raw material groups A to G piled on the central part of the pile are delivered. Furthermore, when the bucket wheels 5, 5 are in position Y, raw materials groups C to G are dispensed. For this reason, if the raw material groups A to G differ significantly in quality such as components or particle sizes, the quality of the raw materials dispensed will vary with the period in which the double-wheel reclaimer 4 reciprocates. Therefore, in order to minimize variations in the quality of raw materials that occur due to the period of reciprocating motion of the double-foil reclaimer 4, the order and combination of raw materials to be stacked is determined so that the quality of raw material groups A to G is constant. is selected.

(Problems to be Solved by the Invention) However, conventionally, the loading amount (T/H) of raw materials loaded from the tanker 3 is constant or fluctuates. In other words, the loading amount (T/H) of raw materials to be loaded from the stacker 3 is determined from the possible loading period and the required total loading amount when creating a loading plan, and is kept at a constant value throughout the entire loading period. It is common to create stowage using In addition, when each raw material is cut out from the storage hopper 1, as shown in Fig. 3,
The stowage plan is not created on the assumption that all hoppers will start and end cutting at the same time, and as a result, raw materials will be cut from all hoppers immediately after cutting starts, but after that, the number of hoppers to be cut may decrease. The loading amount of 3 had changed significantly.

Here, if the loading amount (T/H) of the raw materials stacked from the stacker 3 is constant throughout the entire stowage period, as the loading progresses, the surface area on which the raw materials are stacked becomes smaller than the loading amount of the raw materials. Because it increases in proportion to the square of the square, it does not pose a problem in the first half of the stacking as shown in Figures 4, 5, and 6, as it does with the raw material layer A6, but in the latter half of the stacking, the raw material layer As shown in layer B7, the layer thickness of the stacked raw materials becomes thinner and this is not a problem in the first half of stacking, but in the second half of stacking, raw materials are stacked only on the top of the pile, or on the sides of the pile. If there is a phenomenon in which the raw material is not stacked or the raw material is distributed only to one side in the width direction, and the raw material is discharged by the double foil reclaimer 4, the quality of the sintered ore may vary in the width direction of the pile. This was causing quality fluctuations.

This phenomenon occurs not only during the latter half of the stowage process, but also during the entire stowage period due to fluctuations in the loading amount (T/H) of raw materials in the stacker due to fluctuations in the number of storage hoppers 1 that cut out each raw material. Occur.

(Means for Solving the Problem) In order to solve the problem, the present invention provides a method for obtaining a stable main raw material for sintering by stacking the raw material uniformly in the width direction of the pile. (1) In a method of stacking various raw materials using a bedding stacker that moves back and forth within a specified range in a blending yard, the loading amount (T/ H) is gradually increased and the raw material is cut out from a plurality of raw material cutting hoppers into which the raw material is cut into the bedding stacker so that all hoppers simultaneously start cutting and all hoppers simultaneously finish cutting. This is a raw material loading method in a blending yard.

(Function) By implementing the present invention, when stacking raw materials, the raw materials are stacked uniformly in the width direction of the pile, so when the pile of raw materials stacked with the double foil reclaimer is discharged, the piles of raw materials are stacked in the width direction. Since the raw material is discharged uniformly, the quality of the raw material is stabilized, which in turn stabilizes the quality of the sintered ore, stabilizes the air permeability during the production of the sintered ore, and improves the yield.

Create a stowage plan and perform stowage work so that all hoppers 1 start and end stowing at the same time, and gradually change the stowage amount (T/H) of stacker 3 as the stowage progresses. Each step of increase is also effective on its own.

Ideally, when increasing the loading amount (T/H) of the stacker in steps as the loading progresses, the steps should ideally be placed so that the surface area of the raw materials to be stacked is the square of the loading amount. Since it is proportional to , it is necessary to increase it accordingly, but it is basically limited by the raw material loading capacity of the stacker and hopper 3, so it should be determined by considering the equipment capacity. In addition, increasing the loading amount (T/H) of the stacker each time the raw materials are stacked requires a very large number of operations, resulting in poor workability.Therefore, it is necessary to increase the stacking amount at appropriate intervals.

(Example) Fig. 7 shows the loading amount (T/
An example is shown in which H) is gradually increased as the stowage progresses, but for the first 8 days of the 14-day stowage period, the stacker 3 stowage amount (T/H) is
Loaded at 800T/H for the next 4 days at 1000T/H,
The latter two days will be loaded at 1300T/H. In addition, a stowage plan is created so that all hoppers start and end stowing at the same time, and the stowage work is carried out.

(Effects of the Invention) By implementing the present invention, the quality of the raw material in the width direction of the piles in the blending yard is reduced, and as a result, the main raw material for sintering is stabilized, and the sintering process is stabilized due to the stabilization of air permeability during sintering. It is possible to improve the yield and stabilize the quality of the sintered ore.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of equipment used in blending work. Figure 2 is a cross-sectional view of a mountain explaining the method of discharging raw materials at the blending yard. Figure 3 shows
FIG. 2 is a diagram illustrating a conventional method for cutting out raw material from a hopper. FIG. 4, FIG. 5, and FIG. 6 are diagrams for explaining the stacking situation of raw materials in a cross section of a blending yard according to a conventional method. FIG. 7 is a diagram showing a method of stacking a blending stacker according to the present invention. 1...Storage hopper, 2...Belt conveyor,
3...Blending stacker, 4...Double foil reclaimer, 5...Bucket foil,
6... Raw material layer A, 7... Raw material layer B.

Claims (1)

[Claims] 1 In a method of stacking various raw materials using a bedding stacker that moves back and forth within a specified range in a blending yard, the loading amount (T/H) by the bedding stacker is gradually increased and A method for stacking raw materials in a blending yard, characterized in that raw material cutting from a plurality of raw material cutting hoppers that perform raw material cutting by a blending stacker is started and finished at the same time for all hoppers. .