JPS5825439A - Manufacture of sintered ore - Google Patents

Abstract

PURPOSE:To suppress generation of a large crack on the surface of a sintering bed, by providing a combustion inhibiting part by spraying an incombustible liquid, etc. on the surface of a material layer before ignition. CONSTITUTION:In a sintering machine, a sintering material surface water spray device 9 is provided between a mixing material charging part and an ignition furnace 6, and a combustion inhibiting line is provided by watering an incombustible liquid such as water, etc., onto the surface of a sintering material. This water spray device 9 is formed by a strand direction water spray nozzle group 10, a width direction water spray device 11, a flow rate adjusting valve 13, etc., and is provided with a checkers-like combustion inhibiting line. Or, an unburnt part is generated by placing a non-combustible substance such as a linear or rod- like metal, etc. on the surface of the material layer. According to this sintering method, a fine crack is equally dispersed and generated on only the surface layer, therefore, generation of a large crack can be suppressed, ventilation is equalized, and sintered ore having a uniform quality can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for improving yield by eliminating large cracks occurring on the surface of a sintering bed and eliminating unsintered portions of the bed.

Generally, when iron ore is sintered, sintering occurs due to the collapse of pseudo particles due to moisture evaporation and rapid heating when the iron ore is ignited. For this reason, tension is generated on the bed surface, and a large clutter shown by 01 in FIG. 1 occurs in a weak portion of the surface. This large clutter 01 portion has lower ventilation resistance than the other portions, so ventilation becomes excessive. For the sake of jin,
The combustion temperature is low and it becomes brittle, or it becomes unburned,
The vines progress from the surface layer to the lower layer, resulting in a decrease in quality and causing a decrease in yield.

The wire of the present invention has improved the above-mentioned drawbacks, and the surface of the raw material layer before ignition is sprayed with a linear spray of inflammable liquid or placed with a linear incombustible material, and the part is ignited in an ignition furnace. This was designated as the fine unburned part on the surface. When an attempt was made to prevent large cracks by dispersing and absorbing the surface tension caused by "burning compaction" after ignition in the fine unburned parts, the fine cracks that occurred were large. Ri2
Since it is very small compared to Tsuku 01, ventilation in the clutter area 1
The table (
Top) As the combustion progresses from the layer to the middle layer to the bottom layer, it is fired due to the influence of the surroundings, and as a result, the defective parts are as shown in Table 1 (
Top) It is found that the lower layer becomes uniform and good sintered ore just like the other parts.9 This makes it possible to convert the vicious large cracks into fine fine tarts. It has been found that uniform firing can be achieved and the yield can be improved.

This invention was made based on the above knowledge, and its features are as follows.

(1) A method for producing sintered ore, characterized in that a combustion suppressing portion is provided on the surface of the raw material layer after charging the mixed raw materials in a sintering machine and before igniting the raw materials.

(1) The method for producing sintered ore according to (1) above, characterized in that a nonflammable liquid is poured onto the surface of the raw material layer to provide a combustion suppression line.

(1) The method for producing sintered ore according to (1) above, wherein a combustion suppression line is provided by placing a noncombustible material on the surface of the raw material layer.

(4) The method for producing sintered ore according to (1) above, characterized in that water is poured onto the surface of the raw material layer to provide a combustion suppression line.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 explains one embodiment of the present invention, and in the figure, 1 is a sintering machine, and 2/ri raw material surge cypress.

3 is drum feeder, 4 is sloping chute, 5 is
L sintered layer, 6 is an ignition furnace, 7 is a wind system, 8 is a main exhaust gas duct, and 9 is a sintered raw material surface watering device provided for carrying out the present invention.

FIG. 3 is a detailed view of the sintered raw material surface watering device 9 shown in FIG. 2, where 0) is an overall layout and (b) is a front view.

(C) shows a sectional view of the water sprinkler device in the width direction of the sintering machine.

In each figure, 10 is a group of water spray nozzles in the 27P direction.

11 is a water sprinkling device in the width direction of the sintering machine, 12 is a water sprinkling trolley running device, 13 is a flow rate adjustment nonoruzo, 14 is a flow rate needle, and 15 is an armlet, which distributes water from the water sprinkling device to the sintering raw material placement. to create a combustion suppression line.

FIG. 4 shows an example in which water is sprinkled on the sintering raw material layer using the water sprinkler shown in FIG. 3 to provide a checkerboard-shaped combustion suppression line.

FIG. 5 is a diagram showing the effect of the present invention. As a result of providing the combustion suppression line as shown in FIG. 4, large cracks 01 on the sintered raw material layer disappear after firing, and small microcracks 02 remain on the surface. It has gotten to the point where it is

In this example, water sprinkling was used as a method to create micro cracks 02 and eliminate large cracks C1, but any nonflammable fluid may be used instead of water. It is also effective to place a non-combustible material such as a linear or rod-shaped metal on the surface to generate unburnt 4f>.

Table 1 shows the results of this example along with a comparative example in which no combustion suppressing part was provided.As is clear from the table, spraying water is effective and is considered to be the best method since it is inexpensive.

As explained above in Table 1, according to the present invention (1) fine cracks are evenly distributed and generated only in the surface layer, so the occurrence of large cracks can be suppressed, the ventilation can be made uniform, and the quality can be improved. Can be made uniform.

(2) Yield can be improved because it is possible to eliminate unburned parts of large cracks or parts where yield is deteriorated due to low degree turbidity.

etc., the effect line obtained is large.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the occurrence of large cracks on the surface of a conventional sintering bed, and Figure 2 shows an embodiment of the present invention in which a sintering raw material surface watering device is installed in a DW-E-id sintering machine. Front view, Figure 83 is a detailed view of the sintering raw material surface watering device shown in Figure #I2, 0) is an overall plan view, (B) is a front view, (C) is a sectional view in the width direction of the sintering machine, Figure 4 is a plan view showing an example in which water is sprinkled on the bed surface in the shape of a substrate using a sintering material surface watering device, and Figure 5 is a bed after firing when water is sprinkled in the shape of the substrate as shown in Figure 4. FIG. 3 is a perspective view showing how cracks are generated on the surface. 1: Sintering machine, 2: Raw material serge cypress, 3 Nidram fee/+
, 4: sloping seat, 6: sintering bed, 6: ignition furnace, 7: windows, 8: main exhaust gas duct, 9: sintering raw material surface watering device, 10: strand direction watering device, 11: Sintering machine width direction watering device, 12: Watering trolley running device, 13: Flow rate adjustment valve, 14; Flow meter * 1
5: No R let. Agent Patent attorney Masamitsu Akizawa et al. 2 Naoki 1 zu' / r 2 M / r 3 days (Ro) Tezuzu (Noriben 4 m Nai 2 Yen) 1980 1 false month 4 Director of the Japan Patent Office Blind Mr. Patent Application No. 1!!796 No. 3 of 1983, Relationship with the amended case Applicant address (residence) 2-6-3 Otemachi, Chiyoda-ku, Tokyo Name (665) Nippon Steel Co., Ltd., M'1E
kIq date Showa year month day (shipment) +1i
Notice of Absolute Cause 6, Number of inventions to be increased by amendment

Claims (1)

[Scope of Claims] (1) A method for producing sintered ore, characterized in that in a sintering machine, after charging the blended raw materials, a combustion suppressing portion is softened on the surface of the mosquito raw material layer during the ignition trench. (2) The method for producing sintered ore according to claim (1), characterized in that a combustion suppression line is provided by pouring a nonflammable liquid onto the surface of the raw material layer. (8) The method for producing sintered ore according to claim (1), characterized in that a noncombustible material is placed on the surface of the raw material layer to provide a combustion suppression line. (4) The method for producing sintered ore according to claim 8(1), characterized in that a combustion suppression line is provided by pouring water onto the surface of the raw material layer.