JPH059602A - Production of sintered ore - Google Patents

Abstract

PURPOSE:To prevent disintegration of pseudo-particles of hot returned ore at a low cost and to prevent the reduction of sintered ore throughput. CONSTITUTION:Hot returned ore supplied from a hot screen 4 in a sintered ore producing equipment 1 is fed for resintering from a hopper 5. A water spray or blast equipment 7 is provided to the rear step of the hopper 5 and also in the front step position of a mixing and granulating stage 6 for resintering. Water spray or air blasting is performed for the hot returned ore fed from the hopper 5. This hot returned ore is cooled to the temp. of the same degree as the other raw material for mixing the hot returned ore. Before mixing and granulation for resintering are performed for the hot returned ore, the same is cooled. Moisture stuck to the pseudo-particles is prevented from becoming such a state that the temperature of this moisture is raised and it is easily vaporized. Thereby the pseudo-particles are prevented from being disintegrated by shock in a carrier course which is caused by vaporization of the constitutional moisture of the pseudo-particles. Reduction of sintered ore throughput caused by disintegration of the pseudo-particles is prevented.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is applied to a sinter ore manufacturing facility having a hot screen to prevent the pseudo particles from collapsing in the raw material supplied to the sinter and prevent a decrease in the sinter production amount. The present invention relates to a method for producing a sintered ore made possible.

[0002]

Prior Art and Problems to be Solved by the Invention
Conventionally, this kind of sinter ore manufacturing method has been used for powder ore, return ore,
By cutting out and mixing coke etc. as an auxiliary material at a constant ratio, and granulating this mixed material while pouring water with a mixer, as shown in FIG. It is generally known that the pseudo particles 23 are bonded and then fired on a sintering machine.

When the quasi-particle size is large during the firing, the porosity when fed to the sinter is increased, and the ventilation resistance is reduced and the passing gas when the blower capacity is restricted. Increasing the amount will lead to an increase in sinter production (see Fig. 3).

The return ores here are roughly classified into hot return or cold return. As shown in FIG. 1, the heat return ore is a solid (sintered ore) -gas (air) heat exchanger that is sieved between the sintering machine body 2 and the cooler 3 to remove fine particles and cooled. This is the return ore under the sieve of the hot screen 4 installed to improve the efficiency of the machine 3. Further, the cold return ore refers to the return ore under the cold screen 9 on the exit side of the cooler 3.

However, the above-mentioned heat-returning ore is cut out from the raw material again, mixed with other raw materials and granulated by the mixer, but the heat-returning ore itself has a higher temperature than the other raw materials and is granulated by the mixer. Even after mixing with other raw materials and forming pseudo particles, the temperature will be higher than in the case without heat return ore. At that time,
The moisture attached to the pseudo particles is also raised in temperature, the temperature difference from the atmosphere is widened, and the moisture is more likely to evaporate than when the temperature is low without heat return ore.

[0006] The problem here is that when the water that constitutes the pseudo-particles evaporates, it is caused by the drop at the belt transfer section and other impacts that occur during the process of being conveyed from the mixer outlet to the ore feeding section. , The pseudo particles will collapse. The disintegration of the pseudo particles causes a decrease in the sintered ore production amount (see FIG. 3). It has been confirmed that the collapse of the pseudo particles does not occur only by the drop impact (see FIG. 4).

As a method for preventing such a pseudo particle disintegration phenomenon, a method using a binder that does not depend on water such as quick lime and pulp waste liquid at the time of granulation has been conventionally used (for example, JP-A-59-59840). These binders have a high unit price and are a source of increasing pig iron cost.

The present invention was made in view of the above-mentioned circumstances, and an object thereof is to prevent pseudo-particle disintegration of a raw material containing heat-reduced ore at low cost and prevent a decrease in the production amount of sintered ore. It is to provide a method for producing a sinter.

[0009]

According to the method for producing a sinter according to the present invention, in the sinter production equipment equipped with a hot screen for removing fine particles between the main body of the sinter and the cooling machine, It is the latter stage of the hopper that is cut out to re-sinter the heat return ore sent from the hot screen, and
At the position before the mixing / granulation step for resintering, a sprinkler or blower is installed, and the heat returning ore cut out by the hopper is sprinkled or blown from the sprinkler or blower to generate heat. After the returned ore is cooled to the same temperature as the other raw materials to be mixed, it is mixed and granulated for resintering.

By cooling before the mixing and granulation for re-sintering with respect to the heat-recycled ore, it is possible to prevent the moisture adhering to the pseudo particles from rising in temperature and easily becoming evaporated. . This prevents the pseudo particles from collapsing due to the impact of the transportation process due to the evaporation of the water that constitutes the pseudo particles, and reduces the production of sintered ore that is caused by the pseudo particle collapse. I tried to prevent it.

[0011]

EXAMPLES The method for producing sinter according to the present invention will be described below with reference to the illustrated examples. First, the production equipment for producing a sinter by employing the sinter production method of the present invention will be described.

The manufacturing facility 1 (see FIG. 1) is composed of a sintering machine main body 2
And a cooler 3 are provided with a hot screen 4 for removing fine particles. Then, it is the latter stage of the hopper 5 that is cut out to re-sinter the heat-returned ores sent from the hot screen 4, and the mixing and re-sintering.
At the position before the granulation step 6, watering or blowing equipment 7
Is installed.

In FIG. 1, reference numeral 8 is a mining section, reference numeral 9 is a cold screen, and 10 is a blower.
Numeral 11 is a hopper for cutting the cold return ore from the cold screen 9. Further, the mixing / granulating step 6 includes a hopper 12 for cutting out fine ore for mixing for re-sintering, and a mixer 13 for granulating for re-sintering.

To carry out the method for producing a sinter according to the present invention using the production facility 1 having the above-mentioned structure, the following procedure is carried out.

First, the heat returning ore sent from the hot screen 4 installed between the sintering machine main body 2 and the cooling machine 3 is collected in the hopper 5. Then, the heat return ore is cut out from the hopper 5 to the mixing / granulating step 6 for re-sintering.

Next, the heat return ore cut out from the hopper 5 is
Immediately after being cut out from the hopper 5, it is cooled by sprinkling water or sprinkling air from a blower 7. As a result, the temperature of the heat returning ore until it enters the mixing / granulating step 6 is cooled to the same level as that of the other raw materials by sprinkling or blowing air.

Next, the cooled heat returning ore is sent to the mixer 13 in the mixing / granulating step 6 to be mixed / granulated with other fine ore and cold returning ore. Then, it is sent to the sintering machine main body 2 for re-sintering.

As described above, according to the method for producing a sinter according to the present invention, it is not necessary to use an expensive binder such as quick lime or pulp waste liquor, and the equipment can be remodeled by sprinkling or blowing equipment 7 in the existing production equipment. All you need to do is add it. Therefore, it is possible to easily and inexpensively manufacture the sinter.

[0019]

The heat returning ore from the hot screen is sprayed or blown by a blower to cool the heat returning ore to a temperature similar to that of the other raw materials to be mixed, and then the re-sintering is performed. By mixing and granulating, it is possible to prevent the pseudo particles from collapsing due to temperature rise. Therefore, it is cheap,
Moreover, it is possible to easily prevent the pseudo particles from collapsing, and finally to prevent the production decrease of the sintered ore.

[Brief description of 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 view showing a constitutional state of pseudo particles at the time of producing a sintered ore.

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

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

[Explanation of symbols]

1 ... Manufacturing equipment, 2 ... Sintering machine main body, 3 ... Cooler, 4 ... Hot screen, 5 ... Hopper, 6 ... Mixing / granulating process, 7
… Sprinkler, blast equipment, 8… mine supply department, 9… cold screen, 10… blower, 11… hopper, 12… hopper, 13…
mixer.

Claims (1)

Claim: What is claimed is: 1. In a sinter production facility equipped with a hot screen for removing fine particles between the main body of the sinter and the cooler, the heat return ore sent from the hot screen is regenerated. Along with the hopper that is cut out for sintering, and at the position that is the previous stage of the mixing / granulation step that is for re-sintering, install a sprinkler or blower, and the heat recovery ore cut out by the hopper is Sintered ore that is characterized by performing remixing and granulation for re-sintering after cooling to the same temperature as other raw materials to be mixed with the heat return ore by watering or blowing from a water sprinkling or blowing facility. Production method.