JPH05264178A - Disposal method of steelmaking dust generated from arc furnace - Google Patents

Abstract

PURPOSE:To obtain pellets having stabilized quality by a method wherein the spraying amount of water is controlled by detecting the flow amount of steelmaking dust when the steelmaking dust, generated from an arc furnace, is supplied from a hopper into a pelletizer to pelletize it while spraying water. CONSTITUTION:Steelmaking dust, generated from an arc furnace, is transferred by a conveyer 11 to reserve it temporarily in a hopper 12, then, the dust is delivered from the hopper 12 sequentially by a screw feeder 13 to supply it into a pelletizer through a rotary valve 14 and a flow meter 15. The dust is pelletized in the pelletizer 16 while spraying water from a spray nozzle 18 and formed pellets B are received by a receiver 17. In this case, the measured value of the flow meter 15 is inputted into an operating device 25 to control the opening degree of an automatic valve 22 by a control signal formed in the operating device through operating process while the measured value of a water flow meter 23 is sent into the operating device 25 through feedback to effect the delicate control of the opening degree of the automatic valve 22 whereby the quality of the pellet is stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating steelmaking dust generated from an arc furnace. Steelmaking dust is generated when raw material scrap is charged into an arc furnace and melted. The steelmaking dust is finally collected by a dust collector. It is necessary to prevent the scattered steelmaking dust from scattering when recovering metals such as zinc contained in the steelmaking dust or when landfilling the steelmaking dust to improve the handling property. .. Therefore, the steelmaking dust is pelletized.
The present invention relates to improvements in such pelletizing process.

[0002]

2. Description of the Related Art Conventionally, as the above-mentioned pelletizing treatment, steelmaking dust generated from an arc furnace is temporarily stored in a hopper and is supplied from the hopper to a pelletizer through a feeder to spray water. While making pellets. And in reality, the amount of steelmaking dust supplied from the feeder to the pelletizer is constantly and greatly changed due to its storage amount in the hopper, bridge phenomenon, sticking, etc. A person visually observes and adjusts the spray amount of water.

However, such a conventional method has a drawback that it requires a field worker to carry out a severe work, and only obtains pellets having unstable properties.
On-site workers are placed in a poor working environment in which dust blows up, and if too much water is sprayed, the resulting pellets become muddy, while if too little water is sprayed, the resulting pellets are dry and dry. It becomes.

[0004]

The problem to be solved by the present invention is that the conventional method can obtain only pellets which are extremely harsh to the field worker and which are unstable.

[0005]

DISCLOSURE OF THE INVENTION In the present invention, however, steelmaking dust generated from an arc furnace is temporarily stored in a hopper and is supplied from the hopper to a pelletizer via a feeder to spray water. In the processing of steelmaking dust to be pelletized, a flowmeter is interposed between a feeder and a pelletizer, the flowmeter is connected to an arithmetic unit, and the arithmetic unit is operated according to the flow rate of the steelmaking dust measured by the flowmeter. The present invention relates to a method for treating steelmaking dust generated from an arc furnace, which is characterized in that the amount of water sprayed is controlled through the.

In the present invention, conventional hoppers, feeders and pelletizers can be used. A flow meter is provided between the feeder and the pelletizer, but in order to measure the flow rate of the steelmaking dust as accurately as possible with the flow meter, it is preferable to further provide a rectifier between the feeder and the flow meter. Measure the flow rate of steel-making dust supplied from the feeder to the pelletizer by the flow meter, input the measured value to the arithmetic unit, perform arithmetic processing on the arithmetic unit, and then spray the amount of water by the signal emitted from the arithmetic unit. To control. The amount of water spray is controlled by adjusting the opening degree of an automatic valve or the rotation speed of a pump that is installed in the middle of the pipe between the water tank and the pelletizer. It is preferable that a flow meter is further provided between the valve or the pump and the pelletizer, and the actual water supply amount to the pelletizer measured by the flow meter is fed back to the arithmetic unit.

Thus, the steelmaking dust can be automatically pelletized without any problems in practical use. 1 chosen
It is preferable to input one or two or more kinds to the arithmetic unit as a correction factor. The pelletizing of the steelmaking dust has the greatest effect on the amount of water sprayed in the pelletizer with respect to the amount of steelmaking dust. is there.

[0008]

According to the present invention, since steelmaking dust is automatically pelletized by controlling the amount of water sprayed according to the flow rate, no on-site worker for pelletizing is required, and moreover, the property is always maintained. A stable pellet can be obtained.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram schematically showing one embodiment of the present invention. A hopper 12 is arranged below the conveyor 11 on the downstream side, and the screw feeder 1 is arranged below the hopper 12.
3 are connected. A rotary valve 14 is connected to the lower side of the screw feeder 13 on the downstream side, and a flow meter 15 is connected to the lower side of the rotary valve 14. A pelletizer 16 is arranged below the flow meter 15,
A receiver 17 is arranged below the pelletizer 16 on the downstream side.

A spray nozzle 18 is disposed diagonally above the pelletizer 16, and the spray nozzle 18 and a water tank 19 are connected by a pipe 20. A pump 21, an automatic valve 22, and a flow meter 23 are installed in the pipe 20 in this order from the water tank 19 side,
A bypass 24 is branched from the middle of the pipe between the pump 21 and the automatic valve 22 to the water tank 19. The flow meter 15 is connected to the arithmetic unit 25, the arithmetic unit 25 is connected to the automatic valve 22, and the flow meter 23 is further connected to the arithmetic unit 25.

The steelmaking dust A is conveyed by the conveyor 11,
After being temporarily stored in the hopper 12, it is extruded by the screw feeder 13. The steelmaking dust A extruded by the screw feeder 13 is rectified by the rotary valve 14, the flow rate is measured by the flow meter 15, and then supplied to the pelletizer 16. The steelmaking dust A supplied to the pelletizer 16 is pelletized while spraying water from the spray nozzle 18, and the pellet B is received by the receiver 17. At this time, the measurement value of the flow meter 15 is input to the arithmetic unit 25,
The arithmetic processing is performed by the arithmetic unit 25, and the opening degree of the automatic valve 22 is adjusted by a signal emitted from the arithmetic unit 25. At the same time, the measurement value of the flow meter 23 is fed back to the arithmetic unit 25 to adjust the opening degree of the automatic valve 22. By finely adjusting, the spray amount of water from the spray nozzle 18 is controlled according to the flow rate of the steelmaking dust A supplied to the pelletizer 16. Thus, the steelmaking dust can be automatically and stably pelletized without the need for a field operator for pelletization.

Next, a specific example of the control according to the above-described implementation state will be shown below. Raw material scrap (new cutting press 30
% + Koyama 30% + Shredder 20% + Dalai 10% + Others 10%) are put into an arc furnace to melt steel-making dust, which is collected by a dust collector and conveyed by a conveyor. It was temporarily stored in the hopper. The water content of steelmaking dust was 2%, and the temperature was 100 ° C. This steelmaking dust was supplied to a pelletizer via a screw feeder, a rotary valve and a flow meter, and was pelletized while spraying water from a spray nozzle. When the flow rate of steelmaking dust supplied to the pelletizer was 5 t / hour, the flow rate of water supplied to the spray nozzle was 400 kg / hour, the obtained pellets were as desired, and the water content was 10%.

[0013]

As is apparent from the above, the present invention described above is advantageous in that steelmaking dust can be automatically and stably pelletized without requiring a field operator for pelletization. There is.

[Brief description of drawings]

FIG. 1 is a system diagram schematically showing an embodiment of the present invention.

[Explanation of symbols]

11 ... Conveyor, 12 ... Hopper, 13 ... Screw feeder, 14 ... Rotary valve, 15,
23 ... Flowmeter, 16 ... Pelletizer, 17 ...
Receiver, 18 ... Spray nozzle, 19 ... Water tank, 21 ... Pump, 22 ... Automatic valve, 25 ...
..Computing devices

Claims (2)

[Claims] 1. A feeder for treating steel-making dust, wherein steel-making dust generated from an arc furnace is temporarily stored in a hopper and is supplied from the hopper to a pelletizer through a feeder to pelletize while spraying water. A flow meter is provided between the flowmeter and the pelletizer, the flow meter is connected to an arithmetic unit, and the spray amount of water is controlled through the arithmetic unit according to the flow rate of steel-making dust measured by the flow meter. A method for treating steel-making dust generated from an electric arc furnace. 2. The amount of water sprayed is controlled by inputting one or two or more selected from the types of raw material scraps to be introduced into an arc furnace, the moisture of steelmaking dust and its temperature into a computer as a correction factor. 1. A method for treating steelmaking dust generated from the arc furnace according to 1.