JPS5817136B2 - Molten slag processing equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a molten slag processing apparatus.

Conventionally, methods for treating molten slag, such as blast furnace slag and converter slag, include letting the slag flow down, jetting water against it to granulate it, and letting the granulated slag fall into water to cool it. A known method is to let the slag flow down a drum, granulate it, and cool it by dropping it into water.

According to the above method, in the blast furnace slag, a bad odor is generated due to the generation of H2S, and CaS is segregated in the granule slag, which generates yellow water.

Moreover, the strength of the grain slag does not increase.

Regarding converter slag, measures such as applying MgO to the inner wall of the converter have recently been taken in order to extend the life of the converter, and therefore the sea also contains a large amount of MgO. However, when processed into slag, it spontaneously breaks down at an early stage due to weathering and expansion, resulting in the disadvantages that it cannot be used as aggregate for civil engineering and construction, for example.

The present invention has been made to advantageously solve these drawbacks, and its features are as follows: 1. An apparatus for granulating molten slag using a rotating drum and cooling and processing the granulated slag by air cooling. , a molten slag processing device that includes a rotary cooler in front of the rotating drum.

2. A device for processing molten slag by granulating it with a rotating drum and cooling the granulated slag by air cooling, in which a rotary cooler is provided in front of the rotating drum, and a heat recovery device is connected to the rotary cooler to process the molten slag. Device.

It is related to.

That is, when both blast furnace slag and converter slag are granulated, 130
The slag at a temperature of 0 to 1,500°C is made to flow down onto a rotating drum and granulated. During air cooling, a blower is actively used to blow cold air.
However, in the present invention, by scattering into the rotary cooler, a cooling gradient of about 2000°C/min or more can be reliably achieved, and at least Sufficient cooling time to cool down to 1000°C, that is, sufficient flight time, can be provided.

For example, if the slag temperature is as described above, if it is granulated into particles of 0.1 to 5.0 mm by a rotating drum and flown in a cooler for about 2.0 seconds or more, a cooling gradient of 2000°C/min or more will be obtained.
It can be cooled to at least 1000°C.

This cooling may be carried out to about 1000°C or less, but
Excellent effects such as being able to sufficiently harden the grain slag up to 1000°C can be obtained, so in the present invention, at least 1000°C
℃ as described above.

However, as mentioned above, the temperature of the cooled slag is several hundred degrees, and this heat can be recovered.
A shaft furnace is connected to a rotary cooler, and the heat of the granule slag cooled to at least 1000°C is recovered as, for example, hot air, and used as combustion air in a hot blast furnace in a steel mill, or a heat exchanger is further attached. It can also be recovered as steam.

This is the case when performing heat recovery from granule slag.

It is preferable to limit the cooling to around 1000°C.

By doing so, it can be processed into hard slag, which can be used extremely effectively as aggregate for civil engineering and construction.

In addition, excellent effects such as preventing the generation of H2S, SO2, and yellow water in blast furnace slag, and preventing weathering expansion in converter slag and significantly improving the quality of granule slag can be obtained.

Next, an example device of the present invention will be described.

In the drawing, the slag pan 1 is tilted to cause the molten slag in the pan 1 to flow down to the rotating drum 3 via the chute plate 2.
The particles are granulated into slag, which is scattered (flighted) and stored in a rotary cooler 4 installed in front of the drum, and moved to a discharge port 5 and discharged by rotation and tilting of the rotary cooler.

In addition, in the case of heat recovery, for example, a shaft furnace is connected as the heat recovery device 6, air is sent into the furnace by a blower 7, hot air is circulated to a heat exchanger 8, water is sent to the heat exchanger 8,
Collect as steam.

The slag 9 is discharged to a pan conveyor 10 provided at the bottom of the heat recovery device 6 and conveyed to a predetermined position.

In the figure, 11 is a nozzle that forms an air curtain on the inlet side of the rotary cooler 4, and 12 is a water pipe 14 that cools the wall 13 of the rotary cooler 4 by passing water through it to prevent deformation due to thermal distortion. It is.

Next, an example of operation of the present invention will be given.

81- As described above, according to the present invention, it is possible to process granules of excellent quality, making it extremely effective in waste treatment.

[Brief explanation of drawings]

The drawing is an explanatory diagram showing an apparatus according to an embodiment of the present invention. 1...Slag pot, 2...Chute board, 3.
... Rotating drum, 4 ... Rotary cooler, 5 ... Rotary cooler discharge port, 6
...Heat recovery device, 7...Blower, 8.
...Heat exchanger, 9...Particle slag, 10...
... Bread conveyor, 11 ... Nozzle, 12
... Water supply pipe, 13 ... Rotary cooler wall, 14 ... Drain pipe.

Claims (1)

[Scope of Claims] 1. A molten slag processing device that granulates molten slag using a rotating drum and cools and processes the granulated slag by air cooling, the molten slag processing device having a rotary cooler provided in front of the rotating drum. 2 In an apparatus for processing molten slag by granulating it with a rotating drum and rapidly cooling the granulated slag by air cooling, a rotary cooler is provided in front of the rotating drum, and a heat recovery device is connected to the rotary cooler to process the molten slag. Device.