JPS60234927A - Manufacture of sintered ore - Google Patents

Abstract

PURPOSE:To reduce pores in a combustion zone and to improve the strength and yield of sintered ore by applying a downward pressure to an iron ore bed in a sintering apparatus with a pressurizing unit placed in the surface of the bed and by carrying out sintering. CONSTITUTION:Pressurizing rollers 11 are arranged on a bed 3 in a sintering apparatus in a zone ranging from a firing furnace 2 to the ore discharging part so as to regulate a pressure applied downward from the top with a cylinder. A downward pressure is applied to the bed 3 from the top and sintering is carried out. By this method, pores in the combustion zone are reduced and the strength and yield of sintered ore are improved.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a method for producing sintered ore.

[Prior art]

Generally, a method for manufacturing sintered ore is carried out in steps as shown in FIG. 6, which is a schematic diagram for explaining the manufacturing process of sintered ore.

In FIG. 6, raw materials such as iron ore, coke, various fluxes, and repeated ore are mixed together and charged onto a sintering machine grate (M1) to form a sintering bed 6. Next, the burner of the ignition furnace 2 completes the ignition, and after a certain period of time, the sintered bed 6 is discharged as sintered ore from the rear end of the movable grate, and the pulverized sieve fraction goes through a process to become a product. On the other hand, the sintering exhaust gas is from wind leg 4 → king duct 5 → electrostatic precipitator (EP) 6 → main exhaust fan 7
→ Exhausted from chimney 8.

The yield υ in the above sintering process is significantly inferior to other industrial processes. The cause of this low yield is that after ignition, the combustion zone gradually descends due to the forced downward suction of air, and its thermal history generally reaches a maximum temperature of approximately 1300°C.
Since the holding time at 1100°C or higher is about 2 to 5 minutes, the reaction does not reach equilibrium, and as a result, many → black pores remain in the structure of the burned bottom. Conceivable.

Conventional measures for this purpose include the following.

1) There is a method of compacting the charged material by applying a load from above while it is in the charged state in front of the ignition furnace, but this method has the disadvantage that ventilation is poor, productivity decreases, and the reduction rate deteriorates. 29 It is also possible to consider increasing the coke content, but in this case, the yield of the upper layer will improve, but -'F eyebrows will be -5
This method also does not improve the yield.

[Purpose of the invention]

As mentioned above, the current yield of the sintering process is approximately 70%, which is significantly inferior to other processes, and therefore, the present invention aims to improve this yield.

[Fire of invention]

The inventors conducted various studies on the above sintering process and found that 1) The lower layer receives loads from the upper and middle layers, and the macro C holes are crushed, reducing the number of pores. It has high strength and yield because it can be held at high temperatures for a long time.

2) On the other hand, the upper layer has low strength and yield.

This is because the maximum temperature is low and the time it is held at high temperature is short, and the upper layer does not receive any load from above, so there are many macroscopic pores.

3) In the fg8 consolidation process, when the coke in the twisted and sintered belt is burned and a load is applied from above while the raw material is in a semi-molten state, the semi-molten part with relatively low density is consolidated, reducing the number of pores. Improves strength and yield.

These findings led to the present invention.

The present invention reduces macro pores in sintered ore and improves yield by providing a plurality of pressure rollers on the surface of the bed during sintering in an iron ore sintering machine or by applying a static load to the surface. and to improve strength.

[Embodiments of the invention]

The present invention will be described based on FIGS. 1 to 4, which are embodiment examples.

Figure 1 is a schematic diagram showing the concept of the pressure firing method of the present invention, Figure 2
The figure is a schematic cross-sectional view of the A-A section in Figure 1, Figure 3 is a schematic plan view of the pressure firing section, Figure 4 is a side schematic diagram of the pressure firing section, and Figure 5 is the A section of Figure 4, that is, the pressure It is an enlarged frame second view of the roller section.

In FIGS. 1 to 5, 10 is a static load, 11 is a pressure roller, 12 is a pressure roller bearing, and 16 pressure-adjusting hydraulic straddle punching cylinders.

A plurality of rollers 11 are provided in the rock length direction of the firing section of the sintering bed, and rotate due to frictional force with the surface of the raw material ore layer. Further, a bearing 12 for supporting the pressure roller 11 is installed on the oilfield cylinder 16, and the pressure can be adjusted as appropriate during operation.

This embodiment example shows an example of a pressure roller that produces a downwardly directed side from the top surface of the sintering bed, but it does not only have downwardly directed downwards.
The same effect as the present invention can be obtained even if both the loads are applied from the side direction or the pressure is applied only from the lead.

The position to pressurize is the top of the bed after ignition, and as mentioned above, yA
The effect of unexploded 8IJ is greatly increased by adding it to the firing zone, which is in a semi-molten state.

Next, using the test f@, a load of K 50 k17 (0.08 km 9) was applied on the surface of the baked cake based on the conventional method, and the results are shown in Table 1.

Table 1 In Table 1, as a result of pressurizing cylinder g, the yield and strength increased significantly, and RDI, RI, etc. did not deteriorate, indicating that the present invention is effective in improving yield. [Effects of the Invention] The present invention is a method for producing sintered ore which is extremely effective for improving yield and strength during sintering, and can fully achieve the purpose of the present invention.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the concept of the 7Jn EE Akatsuki forming method of the present invention, Fig. 2 is a schematic diagram of the AA cut inward in Fig. 1, Fig. 3 is a schematic plan view of the pressure firing section, and Fig. 4 911 of the pressure firing department
Fig. 5 is an enlarged schematic diagram of the pressure roller section A; Fig. 6 is a schematic diagram of the surface;
The figure is a schematic diagram for explaining the sintering process. In each figure, the same reference numerals indicate the same or corresponding parts. In the drawings, 2...Ignition furnace, 6...Sintering bed, 5
... King duct, 7... Main exhaust fan, 10... Quiet weight, 11... Pressure roller, 12... 11 + receiver, 13
...Hydraulic cylinder. Agent Patent Attorney Sanro Kimura 1, Small f'l Indication Patent Application 1988-88247 2, Title of Invention Process for Manufacturing Sintered Ore 3-1) Li 11 (i4 Closing with Ruura 111'l) Patent waste 1 person f'1 (jll, (,,,,,,, (412) Nippon Senkan Co., Ltd. 4,
Agent Name 4F PI! Knee 1 - Book - 1 (6
07:l) 6.1ili+l-, 1+li+1. +2'> 1 large 1'1n, -(1
) "Yield" on page 2, line 8 of the specification is changed to "finished product yield (
The amount of finished product/sinter cake amount) is corrected as follows. (2) In the 6th line of page 5, "provided with raw materials" was corrected to ``provided with rollers 11 as raw materials.'' (3) "Additional static curing method" on page 6, line 6 of the same page is amended to read "pressure firing method."

Claims (2)

[Claims] (1) In the zone from the ignition furnace of the sintering machine to the ore discharge section,
A method for producing sintered ore, characterized in that sintering is performed by applying downward pressure from the top of the bed of the sintering machine. (2) The method for producing sintered ore according to claim 11, characterized in that when applying downward pressure from the upper surface of the bed, a pressure roller is used to adjust the pressure using a cylinder.