KR20010058306A - Method for manufacturing sinter - Google Patents

Abstract

PURPOSE: A process for preparing sintered ores by using micro-pore material to improve quality of sintered ores while improving air permeability during absorption by a large blower after discharging compounding raw materials containing a large quantity of iron ores of various coal dusts is provided, which increases productivity and enables to obtain stable quality of sintered ores. CONSTITUTION: In the process for manufacture of sintered ores by burning sintering compounding raw material containing powdery iron ore, side material and heat source on a sintering pallet truck(106), 1 to 5% by weight of micro-pore material is added to the sintering compounding raw material at a level of 50 to 300mm from the upper part of a sintering layer on the sintering pallet truck.

Description

Sintered ore manufacturing method {METHOD FOR MANUFACTURING SINTER}

The present invention relates to a method for manufacturing a sintered ore, in particular, a sintered ore using a pore material to improve the quality of the sintered ore while improving the air permeability upon inhalation by a large blower after charging a blended raw material containing a large amount of various iron ore into the sintering bogie It is about a method.

In general, the sintered ore manufacturing method as shown in Figure 1 is mixed with a variety of iron ore and secondary materials such as limestone, silica sand, serpentine, quicklime and fuel such as bunk coke, anthracite coal, while adding water in a drum mixer Through the assembling process, it is pseudo-integrated and charged to a certain height in the sintering machine bogie through the inclined plate.

Then, by igniting the surface layer portion of the blended raw material charged in the sintering tank cart in the ignition furnace, a large blower is sucked from the lower part of the truck to advance the combustion of the powdered coke, and the sintered ore where the bulking of the fine powder is made by the combustion action is performed. Are manufactured.

In this case, the productivity in the production of the sintered ore is determined according to the air permeability of the blended raw material charged in the sintering bogie, and eventually the air permeability and the quality of the sintered ore is inversely proportional.

Therefore, technology for controlling air permeability is actively developed to increase the air permeability of blended raw materials. For example, a method for manufacturing a sintered ore using a three-stage aeration rod, a vertical aeration rod device, and a surface forming device is developed. It is used for actual industry.

However, such a conventional method for producing a sintered ore is a direct use of a physical mechanical device, there is a limit to the air permeability control in the bed, there is a disadvantage that can not obtain a stable sintered ore quality due to the local air flow in the bed.

It is an object of the present invention to provide a method for producing a sintered ore using a pore material to improve the sintered ore quality while improving the air permeability upon inhalation by a large blower after loading a blended raw material containing a large amount of various ore iron ore into the sintering tank cart. .

1 is a process flowchart showing a conventional sintered ore manufacturing method;

2 is a process flowchart showing a sintered ore manufacturing method according to the present invention;

3 is a schematic view showing a sintered ore manufacturing equipment according to the present invention;

4 is a schematic diagram showing a sintered layer loaded with a void material according to the present invention,

5 is a schematic diagram showing a state in which the pore material according to the present invention formed pores in the sintering reaction,

6 is a graph showing the highest temperature point (B.T.P) obtained during the sintering reaction before and after the invention;

7 is a process flowchart showing a pore material input process in the sintered ore manufacturing method according to the present invention;

8 is a graph showing the relationship between the yield and the sintering productivity according to the void material content according to the present invention;

9 is a graph showing the relationship between the sintering time, the quality recovery rate and the productivity after the use layer of the air gap material according to the present invention.

<Description of the symbols for the main parts of the drawings>

Reference Signs List 101: Raw Material Storage Bin 102: Belt Conveyor 103: Drum Mixer 105: Blended Material Storage Hopper 106: Sintering Machine Truck 111: Wind-Up 113: Electrostatic Precipitator 114: Large Suction Fan 115: Ignition Furnace 116: Drum-Type Cutting Machine 117: Layer Post Detection Rod 118: Inclined plate 201: Pore material storage bin 202: Belt conveyor

In order to achieve the above object, the present invention is a sintered ore manufacturing method for sintering the sintered blended raw material mixed with the ferrite ore and the sub-raw materials and the heat source in the sintering bogie 106 to sinter the sintered composite raw material 1 ~ 1 It is added to 5 wt%, it provides a sintered ore manufacturing method characterized in that it is blended so as to segregate up to 50 ~ 300mm from the top of the sintered layer in the sintered cart 106.

The present invention will be described with reference to the drawings.

In the present invention, a void material (paper pellets, etc.) that is a burnout material, that is, a burnt material is formed during the sintering reaction by using a material that burns out to form a gap so that the effective air volume is increased by forming a gap in the bed.

At this time, the pore material is to be mixed from 50 to 300 mm from the top of the sintered layer in the trolley 106 at a ratio of 1 to 5 wt% relative to the sintered blended raw material.

Here, the mixing ratio of the pore material to the sintered blend material is limited to 1 to 5 wt% because the segregation mixing effect of the pore material is not exhibited at less than 1 wt%, and at 5 wt% or more, the sinter productivity and the recovery rate of the sintered product are reduced. More preferably, the weight percent ratio of the pore material is about 3% of the blended raw material.

In addition, the reason for limiting segregation of the pore material to 50 to 300 mm from the top of the sintered sintered layer to the bottom is that the firing time is short in the weak surface layer at 50 mm or more. If the thickness is less than ㎜, the burnout of the void material is delayed, and the maximum temperature point (BTP) is shortened at the light distribution part, so that the sintering productivity is rather deteriorated.

Hereinafter, the present invention will be described in more detail based on Examples.

(Example)

Mixing raw materials having a blending ratio as shown in Table 1 below were mixed and granulated by adding water in the drum mixer 103, and immediately after the pseudo-incorporation, a void material was added to the sintering machine and applied to a practical operation.

In order to evaluate the sintering characteristics of the sintered ore and the quality of the sintered ore according to the mixing ratio of the pore material as shown in Table 1, the experiment was performed while changing the amount of the pore material to 1%, 2%, 3%, 4%, 5%, respectively.

And, as shown in Figure 8a, the sintering time was the fastest when the mixing ratio of the pore material is 5%, and as the mixing ratio of the pore material decreases, the sintering time is long. Compared to this, there is a slight difference in the space generation that can be rapidly injured and inflow of air, which affects the ventilation of small strata.

On the other hand, as shown in Table 3 and Figure 8 below, the yield and productivity of the material showed the highest mixing ratio of the pore material at 3%.

In view of this, it is judged that the proper mixing ratio of the pore material is 3%, and that the sintering productivity and the yield recovery of the pore material of the pore material are more than 4%.

On the other hand, in general, the sintering heat is insufficient in the upper part of the sintered layer, so the yield of the product is reduced.

9 is a graph showing the relationship between the sintering time, the quality recovery rate and the productivity according to the use layer of the pore material in the sintered ore manufacturing method according to the present invention. In the comparative example, the pore material is uniformly mixed with the entire blended raw material. I chose it.

At this time, the mixing ratio of the pore material was 3% by weight, and as shown in Table 4 below, the mixture was divided into the upper layer and the lower layer from the middle of the sintered layer (350 mm) to induce different mixing layers after the pore material.

As shown in Table 4 and FIG. 9, when the blending ratio of the pore material is 3 wt% from the middle of the sintered layer, the sintering productivity and the yield recovery are high, and when the pore material is segregated downward from the middle of the sintered layer. It was found that the sintering productivity was rather lower.

At this time, the high sintering productivity and the rate of quality recovery are thought to be able to produce sintered ore with stable sintering productivity and stable sintering productivity by forming gaps that increase the effective air volume as the void material burns out faster than other fuels in the bed. .

Therefore, the blending ratio of the blending material of the pore material according to the present invention is 1 to 5 wt%, more preferably 3 wt%, and after the blending sintering layer of the pore material is 350 to 50 mm upward from the middle of the sintered layer, And to improve sintering productivity.

In the present invention, low-grade light containing a large amount of fine powder and high-rise after operation for high productivity, by inserting the pore material at the same time as the mixing raw materials, it can evenly form the air gap to increase the effective air volume in the bed, high production and stable sintered ore quality It can be obtained, and provide a useful effect in breathability control.

Claims (1)

In the sintered ore manufacturing method for sintering the sintered blended raw material mixed with the iron iron ore and subsidiary materials and the heat source by burning in the sintering tank trolley 106, A pore material is added to the sintered blended material so as to be 1 to 5 wt%, and the sintered ore manufacturing method is characterized in that it is blended so as to be segregated from the top of the sintered layer in the sintered trolley 106 to 50 to 300 mm.