JPS5949512B2 - Charging method of sintering raw materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for charging sintering raw materials in a moving bed sintering machine.

・In general, in a moving bed type sintering machine, such as a Dwight Lloyd type sintering machine, when charging sintering raw materials, the pallet should be loaded uniformly in the direction of pallet movement and in the width direction, and evenly in the upper layer in the layer height direction. The charging is done in such a way that grain size segregation occurs, with a high proportion of fine grains in the lower part and a high proportion of coarse grains in the lower part.

That is, as shown in FIG. 2, the raw material 8 in the hopper 1 is cut out from the drum-type feeder 2 rotating in the direction of the arrow, slides down the inclined plate 3+, and is moved by the sprocket 5 in the direction of the arrow. It is loaded onto grade 4 sintered pallets connected to

The raw material 8 charged onto Grade 4 is made to have a uniform layer height by a layer height equalizer 6 so as to have an even layer height.

In sintering operations, it is known that improved air permeability and uniform firing are necessary to achieve higher productivity and to obtain products of superior quality. is self-evident.

That is, in the sintering process, the upper layer is easily cooled and the quality is poor, so it is overall more advantageous to sinter a raw material with a high proportion of fine particles in the upper layer.

However, due to the slope classification effect of this inclined charging, coarse grains tend to roll to the lower layer more easily than fine grains, so it is true that grain size segregation occurs in the layer height direction, but as shown in Figure 1, the raw material is Because the pallet is charged while forming a slope, local slope failures occur periodically as shown from A to D in the figure, and the parts with a high proportion of fine grains in the upper layer push into the lower layer, causing the pallet to collapse in the traveling direction and width of the pallet. In this direction, local segregation as shown in the raw material deposition layer in FIG. 2 occurs periodically.

This periodic thrust segregation due to slope failure causes uneven ventilation, course segregation, and uneven firing, which deteriorates the quality of finished products.

In order to solve this problem, the present invention arranges a plurality of horizontal bars parallel to the width direction of the pallet and perpendicular to the direction of travel of the pallet so that the raw materials are buried in the sediment layer forming the slope. This invention provides a method for charging sintering raw materials, characterized in that the slope is constantly collapsed by the horizontal horizontal bar, and the ingredients and particle size distribution in the raw material layer in the pallet advancing direction are made uniform.

Embodiments of the present invention will be described below with reference to FIGS. 3 and 4.

1 is a hopper for charging raw materials for sintering, 2 is a drum-type feeder that rotates in the direction of the arrow by a drive device (not shown), and 3 is a feeder that is used to easily cause grain size segregation in the layer height direction in the charged raw materials. Inclined plate, 4 is the grade of the endlessly connected sintering pallet that is moved in the direction of the arrow by the sprocket 5, 6 is the layer height to make the sintered raw material charged on grade 4 evenly layered. It is an equal ingredient.

At the lower part of the inclined plate 3, at the point where the charged material falls and at the point where it is deposited, the material 8 is piled up to form an inclined surface, using horizontal horizontal bars 7, 7 that are parallel to the width direction of the pallet and perpendicular to the direction of movement of the pallet. They are arranged vertically so as to be buried in the layer, and the horizontal horizontal bars are supported by support beams 9 so that they can periodically reciprocate in the direction of the slope.

As the drive device, a reciprocating link mechanism using air pressure or an electric motor may be considered, but it is omitted in this drawing.

Note that although the above horizontal horizontal bars are provided in two stages, the upper and lower stages are not limited to this, they can all be designed arbitrarily according to the constraints of the sintering process, and the dimensions of the horizontal horizontal bars and Various attempts were made regarding the number of arrays, shapes, and cross sections, but
The cross section generally has a streamlined shape.

However, this is also a property that should be selected depending on the insertion depth of the horizontal horizontal bar into the charged material as well as other process conditions. Since force is also applied, it is desirable to make the structure as strong as possible.

The method of charging raw materials using the above device will be explained below. The raw materials 8 in the hopper 1 are cut out from the drum-shaped feeder 2 rotating in the direction of the arrow, and the raw materials 8 that have slid down on the inclined plate 3 are It is loaded onto a grade 4 sintered pallet which is moved in the direction of the arrow while forming a slope 10.

However, by periodically reciprocating the horizontal bars 7, 7 embedded in the deposited layer in front of the inclined plate 3 in the direction of the slope by means of the support beam 9, the force acting against the deposited raw materials moving together with the sintered pallet is occurs, and as a result, the slope 10 is forced to collapse at all times.

Due to the constant collapse of this slope, the local plunge segregation of raw materials as described above is eliminated, and a grain size segregation pattern in which fine grains are dominant in the upper layer and coarse grains are dominant in the lower layer is formed uniformly throughout the entire progress. be.

Therefore, uneven ventilation and coke segregation are eliminated, improving quality and productivity.

Next, to explain the effects of the method of this invention in comparison with the conventional method, 1. Figures 5 to 8 compare productivity, pallet speed, return rate, and falling strength, respectively. is the conventional method, and B is the method of the present invention.

As is clear from the figure, the productivity is 1.48 T/hr
m to 1.63T/hri, the return rate decreased from 26% to 18%, and the falling strength increased from 89.5S and I to 92. It has improved to O8,I.

As shown in Figures 9 and 10, this means that there is no local segregation (as a result, the ratio of grain size segregation in the layer height direction increases, which increases the firing rate and improves quality accordingly). (for example, increase the floor height),
By eliminating uneven baking and improving quality, you can see the reason for the increase in productivity.

Further, according to the present invention, the occurrence of burning on the grade is extremely reduced.

As mentioned above, this invention has excellent effects such as not only increasing the productivity of sintered ore but also improving quality and reducing burn-out of grades.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the occurrence of localized thrust segregation of raw materials that occurs periodically, Figure 2 is a schematic front view showing the raw material charging situation in a conventional sintering machine, and Figure 3 is the invention. Figure 4 is a longitudinal side view of the same as above, and Figures 5 to 10 are productivity, pallet speed, return rate, falling strength, and layer height direction. FIG. 3 is a diagram comparing the conventional method and the method of the present invention with respect to the raw material pseudo particle size distribution and the pseudo particle size fluctuation in the middle layer, respectively. In the figure 1...hopper, 2...drum type feeder,
3... Inclined plate, 4... Grade, 5... Sprocket, 6... Layer height equalizer, 7... Horizontal horizontal bar,
8...Raw material, 9...Support beam, 10...Slope.

Claims (1)

[Claims] 1. In a moving bed type sintering machine, when loading sintered ore raw materials into a sintering pallet using a drum feeder, a horizontal lateral direction parallel to the width direction of the pallet and perpendicular to the direction of movement of the pallet is used. By reciprocating the rod in the direction of the slope within the piled layer that forms the slope at the point where the raw material falls, a force is generated that opposes the raw material advancing with the pallet, forcing the pile on the slope to constantly collapse, and the raw material A charging method for sintering raw materials that is characterized by uniform scales and uniform composition and particle size distribution in the pallet advancing direction within the layer.