JPS5857484B2 - Mine slag processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing device for filter slag (commonly referred to as "noro") discharged from a blast furnace, and in particular, it recovers a large amount of thermal energy possessed by the slag and converts it into a molten state. The present invention relates to a processing device for granulating slag for easy handling.

Conventionally, high-temperature slag discharged from blast furnaces is either left on a vast site to cool naturally, or is forced to cool down by spraying water over it.

In either of these methods, the large amount of thermal energy possessed by the mine slag not only dissipates into the atmosphere, but also causes pollution, and when it is rapidly cooled with water, water vapor scatters, which is inconvenient. There is.

It is an object of the present invention to solve the above-mentioned disadvantages of the conventional example and to provide a processing device for slag. The slag, which has been cooled and granulated in advance, is introduced into a rotary kiln, and cooling air is supplied to the rotary kiln to cool the high-temperature liquid slag and granulate it. The feature is that the heat is recovered from the air by taking it out.

When slag cools and solidifies, it sticks to the wall of the cooler and it is difficult to peel it off. However, according to the present invention, slag becomes granular as it cools, so it can be removed from the rotary kiln. The cooled slag becomes easier to handle, and a large amount of thermal energy held in the high-temperature liquid slag is carried away by the cooling air, which is recovered by the exhaust gas boiler, thereby indirectly converting it into slag. According to the present invention, it is possible to recover the thermal energy of the slag processing equipment for the purpose of energy saving.

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

In the figure, reference numeral 1 denotes a rotary kiln having a normal shape and structure, and is supported on a foundation 2 so as to be rotatable by a motor 3.

A mixing kiln 4 is connected to the right end of the rotary kiln 1, and a take-out device 5 is connected to the left end of the rotary kiln 1. The take-out device 5 is connected to a discharge port of a fan 6 for cooling air.

The mixing kiln 4 is mounted on a base 2 so as to be rotatable by a motor 7, and the discharge ports of two gutter 8, 9 arranged vertically are opened at the right end thereof.

10 is a blast furnace, and the slag discharged from the blast furnace is passed through a conduit 11.
The water is sent to the upper gutter 9.

On the other hand, a portion of the T slag that has been cooled in the rotary kiln 1 and turned into granules is supplied to the lower gutter 8 by a conveyor 12.

13 is a tube that takes out hot air from inside the rotary kiln 1 and the mixing kiln 4, and the protection tube 13 passes through the cyclone 14.
Connected to exhaust gas boiler 15.

Reference numeral 16 denotes an exhaust heat recovery device, which includes an exhaust gas boiler 15, steam generation pipes 17, 18, a turbine 19, a condenser 20, a condensate pump 21. Consisting of a deaerator 22, etc.
The air flows through the exhaust gas boiler 15, passes through the dust collector 23, and is emitted into the atmosphere from the chimney 24.

In the figure, 25 is a conveyor for taking out granular slag, 26 is a cooling water pump for cooling the condenser, and 27 is a generator.

Next, the operation of this device will be explained.

When the upper gutter 9 of the pair of gutter supplies high-temperature slag, and at the same time the lower gutter 8 feeds granular slag, the high-temperature slag is placed on top of the granular slag, and is transferred to the mixing kiln 4. guided into.

The mixing kiln 4 is rotating, but since both are introduced in the above-mentioned state, only the granular slag comes into contact with the inner peripheral surface of the mixing kiln 4, and the high-temperature slag comes in contact with this. Instead, the two are mixed here, that is, the granular slag is mixed into the liquid high-temperature slag, and the mixture is sent into the rotary kiln 1.

Then, it is cooled and solidified by the cooling air sent from the cooling air fan 6 with this N, but at this time, since granular slag is mixed in the liquid slag, the liquid slag is cooled and solidified. As a result, the liquid slag solidifies into particles.

The air heated by cooling the liquid slag reaches a high temperature, and the pipe 13 is also taken out, and the exhaust gas boiler 15 gives the heat to the steam generation pipes 17 and 18 to cool it, and then the dust collector 23
After the dust is collected, it is released into the atmosphere from the chimney.

On the other hand, the heat recovered in the form of steam by the waste heat boiler 15 is
It is extracted as rotational (power) energy by the turbine 19,
The generator 27 is rotated.

The slag that has been cooled and granulated in the rotary kiln 1 is taken out from the take-out device 5 and carried out by the conveyor 25, but a part of it is carried by the conveyor 12 to the gutter 8, and as mentioned above, along with the high-temperature slag. It is introduced into the mixing kiln 4.

In this way, in the present invention, the liquid slag is placed on top of the granulated slag and introduced into the mixing kiln, where the two are mixed while being pre-cooled, so that the liquid slag does not come into direct contact with the peripheral wall surface of the kiln. There is no risk of the liquid slag sticking to the kiln circumferential surface during cooling.

Further, when granular slag is mixed in the liquid slag, when it is cooled and solidified in the rotary kiln, it becomes granular, so that handling of the slag after cooling becomes extremely easy.

In addition, the air used to cool the slag in the kiln is taken out to the exhaust gas boiler and the heat is recovered, and the heat is used, for example, to drive a generator, so there is no wastage of energy. It can be effective.

[Brief explanation of drawings]

The figure shows an embodiment of the present invention, and is a partially sectional system diagram.

Claims (1)

[Claims] 1 A rotary kiln is used to cool the slag, and a mixing kiln with an introduction device consisting of a pair of upper and lower gutters is connected to the rotary kiln, and the slag is taken out from the blast furnace by the pair of upper and lower gutters onto the pre-cooled and granulated slag. The high-temperature liquid slag that has just been washed is introduced into a rotary kiln via a mixing kiln, and the cooling air flowing through the rotary kiln is taken out to create an exhaust heat boiler that constitutes an exhaust heat recovery device. A processing device for slag that is supplied to