JPS586496Y2 - Melted slag wind crushing granulation equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a molten slag blow granulation device that obtains granular slag by blowing high-speed airflow onto molten slag discharged from a blast furnace, converter, electric furnace, etc.

Conventionally, a molten slag wind granulation device that blows a high-speed air stream onto molten slag to obtain granular slag and recovers its heat has been known. It is expected that there will be a growing trend in the future to improve the properties and increase the added value in order to make effective use of the materials.

From this point of view, the inventors of the present invention have proposed an air crushing method for molten slag that can modify granular slag, that is, change properties such as particle size, hardness, and oxidation rate, according to the temperature and components of molten slag. As a result of various tests and research aimed at realizing a granulation device, the present invention was completed.
．． It is placed at a suitable location below near the molten slag outlet of the same gutter,
A high-speed gas injection nozzle 3 connected to the outlet of the blower 4 via a pipe 4a. In the molten slag blow granulation apparatus, one end of the pipe 4b is connected to the suction port of the blower 4, and the other end of the pipe 4b is connected to the air intake port 5, and the other end of the pipe 4b is connected to the air intake port 5. A CO2 gas storage tank 8 and a CO2 gas storage tank 9 are connected to each other at appropriate locations via pipes 8a and 9a each having a check valve 6 and a stop valve 7 interposed therein. The present invention relates to a molten slag wind crushing and granulating device, which is characterized by being adjustable.

The present invention will be described in detail below with reference to the accompanying drawings.

In the attached figure, 1 is a molten slag 2 (melting point 1400 to 1600°C) discharged from a converter or the like (not shown) that falls near the tip of the gas jet nozzle of a high-speed gas jet nozzle 3, which will be described later, as shown. The molten slag gutter is arranged so that the molten slag 2 that flows down from the lower end of the gutter 1 is
is blown away by the air flow of the high-speed gas jetted from the high-speed gas jet nozzle 3 to become granular slag 8 with a diameter of 1 to 2 mm.

In this case, the flow velocity of the high-speed gas from the high-speed gas injection nozzle 3 is set to 80 m/s or more.

4 is a blower whose discharge port is connected to the high-speed gas injection nozzle 3 via a pipe 4a, and whose suction port is connected to a filtered air intake port 5 via a pipe 4b provided with a stop valve 5a. When the blower 4 is operated, air from the air intake port 5 is injected from the high-speed gas injection nozzle 3, scattering the molten slag 2 flowing down from the molten slag gutter 1,
The granular slag S is obtained, and the injected air is heated with the heat possessed by the molten slag 2 to recover the heat, which is similar to the conventional apparatus, but the above-mentioned blower 4
This differs from conventional devices in that the wind pressure and volume can be adjusted.

8 is a CO2 gas storage tank filled with CO2 gas.
As shown in the figure, the gas storage tank is connected to an appropriate position of the pipe 4b via a pipe 8a provided with a check valve 6 and a stop valve 7, and by operating the stop valve 7, the CO2 gas storage tank 8 is connected to the pipe 4b. It is possible to supply or stop the supply of CO2 gas inside the pipe 4b.

9 is the 02 gas storage tank, and the 02 gas storage tank is connected to the pipe 8 above.
Similarly to a, it is connected to the pipe 4b through a pipe 9a equipped with a check valve 6 and a stop valve 7 as shown in the figure, and when the stop valve 7 is operated, the 0 in the 02 gas storage tank
The two gases can be supplied into the pipe 4b or the supply can be stopped.

Note that the CO2 gas storage tank 8 and the 02 gas storage tank 9 may be arranged in the pipe 4a.

As described above, the present invention has CO2 gas storage tanks 8 and 0□.
The gas storage tank 9 is separately connected to the appropriate position of the pipe 4b connecting the air intake port 5 and the suction port of the blower 4 via the pipes 8a and 9a, which are equipped with a check valve 6 and a stop valve 7. This is a characteristic feature.

One embodiment of the present invention is constructed as described above, and the high-speed gas jet nozzle 3 is adapted to the temperature, composition, etc. of the molten slag 2 flowing down from the molten slag gutter 1.
The gas ejected from the molten slag 2 can be divided into the following four ways and blown onto the molten slag 2.

(1) Only air can be blown onto the molten slag 2 by fully closing the stop valves 7 of the pipes B a and g a and opening the stop valve 5 a.

(2) By operating the same stopper valve, CO2 gas and 02
The gas can be blown onto the molten slag 2 separately.

(2) Also, by operating the appropriate stopper valve, air
A mixed gas of two or three of CO2 gas and O2 gas can be sprayed onto the molten slag 2.

(4) The blower 4 can change the wind pressure and air volume of the supplied gas within a certain range.

Therefore, by appropriately operating the device of the present invention, appropriately selecting a gas suitable for the temperature, composition, etc. of the molten slag 2, and spraying it onto the molten slag 2 from the high-pressure gas injection nozzle 3,
Granular slag with better quality than before can be obtained,
Can be used for various aggregates, etc.

For example, if you want to obtain normal granular slag, use (1) above.
If you want to obtain granular slag for weathering collapse, use the operation (2) above to blow 02 gas instead of air, which will accelerate the oxidation of FeO in the molten slag and prevent weathering collapse. Strong, high-quality granular slag can be obtained.

Also, by the operation (2) above, CO2 is added to the molten slag 2.
By blowing gas, the molten slag component CaO becomes CaCO
3, and a high-quality granular slag with a hard surface is obtained.

Furthermore, if necessary, air, C
By spraying a mixture of two or three gases, O gas and O2 gas, onto the molten slag 2, it is possible to obtain a high-quality granular slag suitable for the purpose of use.

Further, by performing the above operation (4) of appropriately changing the wind speed and air volume of the blower 4, the average particle size of the granular slag can be changed.

Note that when the 02 gas is sprayed onto the molten slag 2 from the high-speed gas injection nozzle 3, there is an advantage that the molten slag 2 can be granulated more easily by increasing the temperature of the molten slag and reducing its viscosity.

Since the device of the present invention has the above-described configuration and function, the device of the present invention achieves the above objectives and produces molten slag that can efficiently obtain high-quality granular slag suitable for the purpose of use. This has the practical effect of realizing an air crushing granulation device.

[Brief explanation of the drawing]

The drawing is a schematic illustration of an embodiment of the present invention. 1: Molten slag gutter, 2: Molten slag, 3: High-speed gas injection nozzle, 4: Blower, 5: Air intake, 5a stop valve, 6: Check valve, 7: Stop valve, 8: CO
2 gas storage tank, 9:02 gas storage tank.

Claims (1)

[Scope of utility model registration request] Molten slag gutter 1 through which the molten slag 2 flows down. 3. A high-speed gas injection nozzle arranged at a suitable position below near the molten slag outlet of the gutter and connected to the outlet of the blower 4 via a pipe 4a. In a molten slag blow granulation device, one end of which is connected to the suction port of the blower 4, and the other end of a pipe 4b, which is interposed with a stop valve 5a, is connected to the air intake port 5,
CO2 gas storage tanks 8 and 02 are installed at appropriate locations on the pipe 4b.
The gas storage tank 9 is separately connected to each other via pipes 8a and 9a, which are provided with a check valve 6 and a stop valve 7, so that the wind pressure and air volume of the blower 4 can be adjusted. Wind crushing granulation equipment for molten slag.