JPH03191030A - Production of sintered ore - Google Patents

Abstract

PURPOSE:To produce sintered ore having excellent quality with good productivity with an endless moving grate type sintering machine by measuring the air permeability in the raw material layer in a pallet and controlling the rotating speed and height of a roll feeder and the angle of inclination of a sloping chute. CONSTITUTION:The raw materials in a hopper 3 are supplied via the roll feeder 4 and the sloping chute 5 into the pallet 1 at the upstream end of the continuously moving pallet 1 of the sintering machine to form the raw material layer 10. This raw material layer 10 is ignited in an ignition furnace 6 and the waste combustion gas thereof is sucked downward by a wind box below the pallet 1 to fire the raw materials. The air permeability of the raw material layer 10 in the pallet 1 is measured by an air permeability meter 8 and is fed to a controller 9. The controller 9 controls any one of the rotating speed of the roll feeder 4, the height (H) of the roll feeder 4 including the hopper 3 and the angle (alpha) of inclination of the slopping chute 5. The productivity is enhanced in this way and the sintered ore having the excellent quality is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing sintered ore of excellent quality with high productivity.

[Conventional technology]

Sintered ore is generally manufactured using an endless moving grate type sintering machine as shown in FIG. That is, the sintering machine includes an endless pallet 1 that moves continuously in a certain direction,
A plurality of wind boxes 2 are provided below the pallet 1 along the moving direction thereof, and a hopper 3 for supplying raw materials is provided above the upstream end of the pallet 1 and has a roll feeder 4 at its lower end. A sloping chute 5 inclined at a predetermined angle, the upper end of which is located directly below the roll feeder 4 and the lower end of which is located above the pallet 1; The pallet 1 consists of an ignition furnace 6 for igniting raw materials, and a crusher 7 provided near the downstream end of the pallet 1.

The raw material in the hopper 3 is cut out by a roll feeder 4, passes through a sloping chute 5, and is charged into a continuously moving pallet 1. The raw material charged into the pallet 1 is placed in the ignition furnace 6, where the coke powder on the surface of the pallet is ignited by combustion gas injected through multiple rows of bars provided in the width direction of the pallet. The high-temperature combustion exhaust gas generated by the combustion of coke breeze is sucked downward by the wind box 2 installed below the pallet 1.
The raw materials inside are heated and fired. In this way, the raw material in the pallet 1 is fired, discharged from the downstream end of the pallet 1, and then crushed to a predetermined particle size by the crusher 7 to become a product sintered ore.

[Problem to be solved by the invention]

When producing the above-mentioned sintered ore, the productivity is greatly affected by the permeability of the raw material layer within the pallet, and deterioration of the permeability leads to a decrease in productivity.

Conventionally, means for increasing the permeability of the raw material layer include adjusting the particle size of granular raw materials consisting of powdered iron ore, powdered coke, powdered limestone, and quicklime, which are used as raw materials, or
This was done by adjusting the granulation properties by adjusting the amounts of water and quicklime added.

However, the above-mentioned method is insufficient to increase air permeability and improve productivity, and cannot quickly respond to changes in air permeability in a short time.

Therefore, an object of the present invention is to provide a method for immediately responding to and immediately improving the permeability of the raw material layer within a pallet, and for manufacturing sintered ore with high productivity and excellent quality. be.

[Means to solve the problem]

In the present invention, at the upstream end of a continuously moving pallet of an endless moving grate type sintering machine, raw materials housed in a hopper are transferred to a roll feeder provided at a lower part of the hopper and to a roll feeder tilted at a predetermined angle. The raw material is fed into the pallet through a sloping chute, then ignited in an ignition furnace, and the combustion exhaust gas is sucked downward by a wind box provided below the pallet, thus In a method for producing sintered ore, which comprises firing the raw material in a pallet.

Measuring the air permeability of the raw material layer in the pallet, and based on the measurement result, at least one of the rotation speed of the roll feeder, the height of the roll feeder including the hopper, and the inclination angle of the sloping chute. It is characterized by its control.

Next, the present invention will be explained with reference to the drawings.

As shown in FIG. 1, an air permeability meter 8 is provided below the downstream side of the pallet 1 adjacent to the hopper 3.
The air permeability of the raw material layer 10 within the pallet 1 is measured by the following.

The height (H) of the roll feeder 4 including the hopper 3 is controllable, and the rotational speed of the roll feeder 4 and the inclination angle (α) of the sloping chute 5 are also controllable.

The air permeability of the raw material layer 1o measured by the air permeability meter 8 is:
The information is sent to the controller 9, and the controller 9 controls the rotation speed of the roll feeder 4, the height (H) of the roll feeder 4 including the hopper 3,
And, one of the inclination angles (α) of the sloping chute 5 is controlled.

The permeability of the raw material layer 10 is set in advance so that sintered ore with good productivity and a predetermined strength can be obtained, and this is stored in the controller 9.

During operation, the air permeability of the raw material layer 10 in the pallet 1 is continuously measured by the air permeability meter 8, and when the measurement result is lower than the set value, the rotation speed of the roll feeder 4, including the hopper 3 At least one of the height (H) of the roll feeder 4 and the inclination angle (α) of the sloping chute 5
Lower one.

As a result, the falling energy of the raw material cut out from the roll feeder 4 and falling into the pallet 1 via the sloping chute 5 is weakened, and the charging density of the raw material within the pallet 1 is reduced. Therefore, productivity can be improved.

If the permeability measurement result by the permeability meter 8 is higher than the set value, the strength of the sintered ore decreases and its quality deteriorates, even if the productivity improves. Therefore, the rotational speed of the roll feeder 4 mentioned above, the height (H) of the roll feeder 4 including the hopper 3, and the inclination angle of the sloping chute 5 (
Raise at least one of α). As a result, palette 1
The charging density of raw materials in the sintered ore is increased, and the strength of the sintered ore is increased.

Next, the present invention will be explained by examples.

[Example 1] Raw materials having the blending ratios shown in Table 1 were sintered using an endless moving grate type sintering machine under the following conditions.

Table 1 a, Pallet width and length: width 5m x length 9m b, layer thickness in pallet: 550mm C, height from roll feeder to surface of raw material layer in pallet: 1,950mm d, sloping chute Inclination angle: 50 degrees Under the above conditions, by lowering the rotation speed of the roll feeder from 4 rpm to 3 rpm, the permeability of the raw material layer in the pallet improved from 21 to 24, and the productivity increased by 1.
．． 9T/m・day 2. We were able to increase this to OT/m・day.

[Example 2] In the above Example 1, the rotation speed of the roll feeder was set to 4.
By keeping the rpm constant and lowering the inclination angle of the sloping chute in d from 50 degrees to 46 degrees,
The air permeability of the raw material layer within the pallet improved from 21 to 24, and the productivity increased from 1.9 T/m・day to 2. O.T.
/rn'・day.

[Example 3] In Example 1 above, the rotation speed of the roll feeder was set to 4.
The rpm is kept constant, and the height from the roll feeder in a above to the surface of the raw material layer in the pallet is 1950 m+
By lowering the air permeability of the raw material layer within the pallet from 21 to 24, the productivity was reduced from 1.9 T/m 2. OT/rn'-
I was able to improve it on the same day.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to immediately respond to and improve the permeability of the raw material layer in the pallet, and to manufacture sintered ore with high productivity and excellent quality. Moreover, useful effects are brought about.

6. Ignition furnace, 8... Air permeability meter, 10... Raw material layer.

7... Crusher, 9...controller,

Claims (1)

[Claims] 1. At the upstream end of the continuously moving pallet of the endless moving grate type sintering machine, the raw material contained in the hopper is transferred to a roll feeder provided at the bottom of the hopper, and The raw material is supplied into the pallet through a sloping chute that is inclined at a predetermined angle, and then the raw material is ignited in an ignition furnace, and the combustion exhaust gas is sucked downward by a wind box provided below the pallet. Thus, in the method for producing sintered ore, which comprises firing the raw material in the pallet, the permeability of the raw material layer in the pallet is measured, and based on the measurement result, the rotation speed of the roll feeder, the A method for producing sintered ore, comprising controlling at least one of a height of the roll feeder including a hopper and an inclination angle of the sloping chute.