JP2626316B2 - Sinter production method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is employed in a sinter production facility having a hot screen to prevent the collapse of pseudo particles in a raw material fed to a sintering machine and prevent a decrease in sinter production. The present invention relates to a method for producing a sintered ore.

[0002]

2. Prior Art and Problems to be Solved by the Invention
Conventional methods for producing this type of sintered ore include fine ore, returned ore,
By cutting and mixing coke and other raw materials at a fixed ratio and granulating the mixed raw material while pouring it with a mixer, fine particles 22 are formed around core particles 20 through water 21 as shown in FIG. It is generally known that the pseudo particles 23 are combined and then fired on a sintering machine.

[0003] When the size of the pseudo particles is large in the sintering, the porosity when the ore is fed to the sintering machine is increased, and the ventilation resistance and the passing gas when the blower capacity is restricted are reduced. Increasing the amount leads to an increase in the amount of sinter production (see FIG. 3).

[0004] The ore return here is roughly divided into hot return ore and cold return ore. Then, as shown in FIG. 1, the heat refining is performed by sieving between the sintering machine main body 2 and the cooling machine 3 to remove fine particles, and the cooling is a solid (sintering ore) -gas (air) heat exchanger. This is the ore return under the hot screen 4 installed to improve the efficiency of the machine 3. Cold returned ore refers to returned ore below the cold screen 9 on the exit side of the cooler 3.

[0005] However, the above-mentioned heat returned ore is again cut out from the raw material, mixed with other raw materials and granulated by a mixer. Even after being mixed with other raw materials and converted into pseudo-particles, the temperature is higher than in the case where there is no heat return. At that time,
The temperature of the moisture attached to the pseudo particles is also increased, the temperature difference from the atmosphere is widened, and the moisture is more easily evaporated than when the temperature is low without heat return.

The problem here is that when the water constituting the pseudo-particles evaporates, it is dropped at the belt transfer section and other impacts that occur during the process of being transported from the mixer outlet to the mining section. That is, the pseudo particles are disintegrated. The disintegration of the pseudo particles results in a decrease in sinter production (see FIG. 3). In addition, it has been confirmed that the collapse of the pseudo particles does not occur only by the drop impact (see FIG. 4).

Conventionally, as a method for preventing such a phenomenon of pseudo-particle collapse, there is a method of using a binder which does not depend on moisture such as quicklime or pulp waste liquid at the time of granulation (for example, JP-A-59-59840). These binders have a high unit price and are a source of increase in pig iron cost.

[0008] The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to make it possible to inexpensively prevent quasi-particle collapse of a raw material including heat-returned ore and to prevent a decrease in the amount of sintered ore produced. An object of the present invention is to provide a method for producing a sintered ore.

[0009]

According to the sinter ore production method of the present invention, in a sinter ore production facility provided with a hot screen for removing fine particles between a sinter machine main body and a cooler, Along with the hopper that cuts out the hot return sent from the hot screen for resintering,
At a position prior to the mixing / granulation step for resintering, a water spraying or blowing device is installed, and the heat returned ore cut out by the hopper is sprayed or blown from the water spraying or blowing device to generate heat. After cooling the returned ore to the same temperature as other raw materials to be mixed, mixing and granulation for resintering is performed.

[0010] By cooling before the mixing and granulation for re-sintering of the hot return, the moisture attached to the pseudo-particles is prevented from being heated and easily evaporated. . This prevents the pseudo-particles from collapsing due to the impact of the transport process due to the evaporation of the water constituting the pseudo-particles, and reduces the decrease in sinter ore production due to the pseudo-particle collapsing. This is to prevent it.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for producing a sintered ore according to the present invention will be described with reference to the illustrated embodiments. First, a production facility for producing a sintered ore by employing the method for producing a sintered ore of the present invention will be described.

The production equipment 1 (see FIG. 1) includes a sintering machine main body 2.
And a cooler 3, a hot screen 4 for removing fine particles is provided. And it is the latter stage of the hopper 5 which cuts out the heat returned ore sent from the hot screen 4 for resintering,
At a position prior to the granulation step 6, a water spraying or blowing equipment 7
Is installed.

In FIG. 1, reference numeral 8 denotes a feeder, reference numeral 9 denotes a cold screen, reference numeral 10 denotes a blower,
Numeral 11 denotes a hopper for cutting cold ore from the cold screen 9. The mixing / granulation step 6 includes a hopper 12 for cutting fine ore or the like for mixing for resintering, and a mixer 13 for performing granulation for resintering.

The method for producing a sintered ore according to the method of the present invention using the production equipment 1 having such a configuration is performed as follows.

First, heat returned from the hot screen 4 installed between the sintering machine main body 2 and the cooling machine 3 is collected in a hopper 5. Then, the heat return ore is cut out from the hopper 5 to the mixing / granulation step 6 for resintering.

Next, the heat returned from the hopper 5 is
Immediately after cutting out from the hopper 5, cooling is performed by watering or blowing from the watering or blowing equipment 7. Thereby, the heat return temperature before entering the mixing / granulation step 6 is cooled to the same temperature as other raw materials by watering or blowing.

Next, the cooled heat returned ore is sent to the mixer 13 in the mixing / granulation step 6, where it is mixed and granulated with other fine ore or cold returned ore. Then, it is sent to the sintering machine main body 2 for resintering.

As described above, according to the method for producing a sintered ore of the present invention, it is not necessary to use an expensive binder such as quick lime or pulp waste liquid. It only needs to be added. Therefore, the production of the sintered ore can be performed easily and inexpensively.

[0019]

According to the present invention, the heat returned from the hot screen is sprinkled or blown by a water spraying or blowing device to cool the heat returned ore to the same temperature as the other raw materials to be mixed, and then re-sintered. By performing mixing and granulation, it is possible to prevent pseudo-particle collapse from rising in temperature. Therefore, it is inexpensive,
Moreover, it is possible to easily prevent the pseudo particles from collapsing, and finally prevent a decrease in the production of sintered ore.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a sinter ore manufacturing facility manufactured by adopting the sinter ore manufacturing method of the present invention.

FIG. 2 is a schematic diagram illustrating a configuration state of pseudo particles during sinter production.

FIG. 3 is a graph showing a relationship between a pseudo particle diameter and a production amount of sinter at the time of ore supply.

FIG. 4 is a graph showing a relationship between a pseudo particle diameter and the number of times of drop impact.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Manufacturing equipment, 2 ... Sintering machine main body, 3 ... Cooling machine, 4 ... Hot screen, 5 ... Hopper, 6 ... Mixing and granulation process, 7
… Water spraying and blowing equipment, 8… mineral supply section, 9… cold screen, 10… blower, 11 hopper, 12 hopper, 13…
mixer.

Claims (1)

(57) [Claims] In a sinter production facility provided with a hot screen for removing fine particles between a sintering machine main body and a cooling machine, heat return sent from the hot screen is cut out for resintering. Sprinkling or blowing equipment is installed at the position after the hopper and before the mixing / granulation process for resintering, and water is sprayed from the spraying or blowing equipment to the heat return ore cut out by the hopper. Alternatively, a method for producing a sintered ore, which comprises cooling by cooling to a temperature substantially equal to that of another raw material to be mixed with the hot return ore, followed by mixing and granulation for resintering.