JPS582172B2 - Cooling processing method for blast furnace slag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling processing method for blast furnace slag.

BACKGROUND ART Conventionally, a method for cooling blast furnace slag is known in which slag wool is produced by spraying pressurized steam or pressurized air onto blast furnace slag, and water slag is produced by spraying pressurized water onto the blast furnace slag.

However, the product, slag wool, has relatively short fibers,
In addition, the water slag had a small particle size and a slight drawback.

Even if it is blast furnace slag, if it is slag outside the furnace rather than in front of the furnace, in other words, if it is slag that has been taken into a ladle etc., if pressurized water is sprayed on it, it will turn into sand, and if pressurized steam or pressurized When air is blown, it does not turn into short fiber slag wool,
The only way to use the slag from outside the reactor was to turn it into sand by spraying it with pressurized water and scattering it on roads.

This invention produces a processed product, that is, slag wool with long fibers, from the blast furnace front slag, which has a higher utility value than the above-mentioned blast furnace outside slag, and also produces a processed product with a higher utility value than the conventional one, that is, a slag wool with long fibers. The purpose is to obtain water slag.

To explain the configuration of an example of the apparatus used to carry out the method of the present invention based on the drawings, as shown in FIG. The cooling tank 2 has a pressurized fluid jet port 3 opened toward the fall path 4 for blast furnace slag falling from the blast furnace slag drop gutter 1, and this opening 5 has a pressurized fluid jet port 3. A powder/grain material receiving shelf 6 is provided below the mouth of the outlet 3, and the receiving shelf 6
A powder/grain material falling gutter 8 from a powder/grain material hopper 7 is opened toward the.

In the figure, 9 indicates a rotary feeder, and 10 indicates a water cooling chamber.

When producing slag wool, the present invention is directed to directing pressurized steam or pressurized air as a pressurized fluid through a jet port 3 toward the front slag that has just come out of the blast furnace and which falls from a blast furnace slag drop gutter 1. During spraying, when the powder and granules are fed from the powder hopper 7 onto the receiving shelf 6 while rotating the rotary feeder 9, pressurized steam or pressurized air is blown into the furnace slag together with the powder and granules. The furnace slag surrounds the powder and granules at the moment of cooling, and the powder and granules serve as cores to form long fibers of slag wool.

Furthermore, as in this invention, if the slag in front of the blast furnace is immediately discharged into the air and then is blown with pressurized air or steam mixed with granules, the furnace of the blast furnace is The humidity of the molten slag is usually around 1450°C and the glass content is over 95%, so it is possible to obtain high-quality slag wool with sufficiently long fibers using the powder particles as the nucleus. However, if the molten slag is If you divide it into something like a ladle,
In other words, the temperature of the molten slag coming out of the blast furnace drops to about 1350℃ and the glass content decreases to 45℃.
Since it drops to about 85%, it does not become slag wool.

Further, when creating water slag, the pressurized fluid spouted from the spout 3 is used as pressurized water.

When obtaining water slag, as mentioned above, if the furnace slag freshly discharged from the blast furnace is rapidly cooled in pressurized water mixed with powder and granules in a short time of 1/100 seconds or less as in the present invention, the powder and granules can be obtained. becomes the core, resulting in extremely heavy and hard water slag.

The key is to rapidly cool the blast furnace front slag, which has a high glass content, from a slag state using pressurized fluid and powder particles that form the core during cooling.

The powders used are slag, fine grains of pumice, silica sand, lime powder, iron powder, or raw materials for paint, and if powders are used as raw materials for paint, it is also possible to color the product. It is.

We have listed various powders and granules, but to clarify the processed products produced by each powder and granules, a1: When water slag made from blast furnace slag is mixed with pressurized water, it has a high glass content and becomes an excellent raw material for blast furnace cement. A soft water slag is obtained.

2. When water slag made from blast furnace slag is mixed with Kao steam or pressurized air, slag wool with sufficiently long fibers can be produced, and can be used as an alternative to expensive glass cooling.

b When pumice is mixed into pressurized water, pumice has a high SiO2 content and a low CaO content, so SiO2
It is suitable as a raw material for slag glass products because it yields slag with a high content of CaO and a small amount of CaO.

C When silica sand is mixed into pressurized water You can get water slag that can be used to make clinker.

Silica sand increases the viscosity of slag and increases the silicic acid content, so it can be used as a raw material for glass, ceramics, and clinker.

d When lime powder is mixed into pressurized water, slag is removed from the sulfur content, resulting in slag for clinker with well-adjusted lime, slag for stabilizing soft ground, etc., and can also be used as a compound fertilizer as a soil improvement material. .

e When iron powder is mixed into pressurized water, it is used as an agent to adjust the iron content in cement clinker slag.

By the method described above, the furnace slag freshly discharged from the blast furnace is first released into the air, and when the pressurized fluid mixed with powder and granules is sprayed into the falling path 4, the slag shown in Fig. 2A is produced. As shown,
At the moment when the slag in front of the furnace is cooled, the granular material a becomes the core, and the slag b is attached around it, and the outer periphery of the slag b is surrounded by the ejected fluid c.

At this time, both the granular material a and the ejected fluid C are slag b.
Since the humidity is lower, the slag b is rapidly heated internally and externally, and the slag b' is surrounded by the ejected fluid c', which is produced by the conventional method without mixing the granular material a, as shown in the opening of Figure 2. Compared to other materials, slags that need to be cooled one after another tend to stick to the outer periphery, and slag tends to be large in diameter, heavy, and hard, while slag wool tends to have long fibers. easy to become

Note that the device used to carry out this method is not limited to the one shown in Fig. 1, but as shown in Fig. 3A, the receiving shelf is a cylinder 11, and the device is capable of receiving pressurized fluid from the after-manure. As shown in the opening in Figure 3, the receiving shelf is a belt conveyor 12 and the powder and granules are sprayed as it is being sent.As shown in Figure 3 C, the receiving shelf is A conceivable example is one formed in the suction nozzle 13.

According to the method of this invention, it is possible to obtain a material that is larger in particle size, heavier, and harder than conventional water slag, and is also longer than conventional slag wool, which is comparable to glass wool in terms of heat and sound insulation. By selecting the particle size of the water slag, the length of the slag wool, the type and particle size of the granular material, the pressurized fluid, and the use of a low-sludge granular material, it is possible to obtain longer fiber slag wool or a single layer of slag wool. Excellent water slag can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of an example of a device used to implement the blast furnace slag cooling processing method according to the present invention, Fig. 2 is an explanatory diagram of the operation, and Fig. 3 is a skeletal diagram of another device used. Show each.

Claims (1)

[Claims] 1. Immediately discharge the blast furnace front slag into the air and spray a cooling pressurized fluid toward its falling path, and when cooling the furnace front slag, powder and granules are mixed in the pressurized fluid. A cooling processing method for blast furnace slag.