JPS6148474A - Use of steel slag - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention has the property of expanding and collapsing after cooling, so after aging treatment, it is partially used for roadbed materials, etc., but most of it is disposed of in landfills. This is related to the current effective use of steelmaking slag.

Although there are various types of steelmaking slag, the present invention targets converter slag and electric furnace slag (reducing stage).

Generally, steelmaking slag contains 2CaO3iOx, FCaO, F
, MgO, 2CaO-FeU03, 4CaO・Am0)
- Blast furnace slag has latent hydraulic properties because it contains FeyuOj, Fe)04, FCaO3, FaO, etc. When slowly cooled, blast furnace slag becomes melilite (2Ca04Ωso) 4'
i0z~2CaO・Mg04SiO1 intermediate component) and C
It has aS, becomes mainly glass when rapidly cooled, has latent hydraulic properties, and is used as a blast furnace cement admixture.

Currently, these steelmaking slags are collected in a slag ladle, and are heated to about 20 to 12
Although it is discharged after some time, when the temperature reaches about 200-300℃, it expands and collapses when 2CaO/SiO transitions from β to γ, and because it contains F-CILO and F-MgO, it has expansion and collapse properties. Therefore, as mentioned above, most of the fruit is landfilled.

The present invention relates to a method for solving the above-mentioned drawbacks and effectively utilizing the problems.
It is pulverized with an air flow so that it is mainly α゛~β-2CaO・SiO or glass, or partly α1~β-2CaO・SiOz, and then falls into water and becomes water slag (hereinafter referred to as feng shui). (referred to as pulverized material), it was found that it has hydraulic properties when it is crushed and kneaded after drying.

It has also been found that the greater the powderiness, the more rapidly it hardens.

Furthermore, even though it is called converter slag, due to its chemical composition, there is also slag that has a very low iron content, and electric furnace slag also has a method of producing both the oxidation and reduction phases (one slag method), which only contains iron. When it is slowly cooled, 2CaO-Feh
After modification of the components produced by 03.4CILO・AJ2JOS-Fea03, the feng shui slag is stronger.

(Because the chemical composition range is quite wide and the basicity is high)
Due to its high melting point, wind and water slag formation rates may be reduced.

Furthermore, by adding silicate rocks and minerals, α′ to β−
From 2CaO-SiOu to 2CaO-SiOz ~2
When modified to mainly CaO-Mg0.2SiO, the melting point and viscosity decrease, wind and water slag formation rates are improved, and it becomes glass-based.
(OR) Yu.

It was discovered that by adding a small amount of cement, etc.) and kneading it with water, it has hydraulic properties, and in order to equalize the development of sludge solidification strength, silicate rocks, minerals, etc. are added. .

As an additive, it is okay to use only human iao yu or sio yu, but
Since it has the disadvantage that the melting temperature is high and it is difficult for the reaction to occur, by adding a substance containing an appropriate amount of SiO2, kJa-Ot%F, etc., the melting temperature is promoted to lower and the reaction occurs sufficiently. This is what I did.

How to add additives 1. Pour into the smelting furnace from the beginning or during the smelting process.

2. After tapping, pour into the smelting furnace.

3. Pour into contact with the slag flow discharged from the smelting furnace. (Simultaneous input) 4. Inject at a distance from the falling position of the slag flow from the smelting furnace to the slag ladle.

5. Use as a substitute for slag in a slag pot.

6. Pour the slag into the slag pan so that it forms a sandwich with the slag.

7.3.4,5,6. Insert the lance pipe-like object and add bubbling gas (0 U, improved, or Air
) and diffuse it.

8. Slag heating furnace (electric furnace method, 0U gas fuel furnace method)
- Charge molten slag and additives, including postalized slag.

There is a way.

The present invention aims to provide a method for effectively utilizing the above-mentioned steelmaking slag, and its gist is to add and mix blast furnace water slag and calcium chloride to molten steelmaking slag, and then to mix the steelmaking slag with an air stream. This is a method of utilizing steelmaking slag, which is characterized by subjecting it to a treatment in which it is crushed into pieces and then allowed to fall into water.

Incidentally, it is even more effective to simultaneously knead granite, sandstone, slate, etc. as the modifying material.

Experiments conducted to confirm the effects of the method of the present invention and their effects will be shown below.

Table 1 shows the chemical analysis values and properties of the samples used in the experiment.

Table 1 *Due to dusting and disintegration during the cooling process, 1
It was set as 00%. Others were measured by autoclave treatment using the ASTM method.

*l Collapse rate (X) was 100* for steelmaking slag (A) and 35X for steelmaking slag (B).

After drying the above sample in a constant temperature dryer (maintained at 105-110°C) for more than 24 hours, it was placed in an electro-fused magnesia crucible with 500
g, remelted in a siliconite electric furnace (maintained at 1550°C), taken out of the furnace, tilted the crucible, blew compressed air out of the nozzle, and dropped it into a water tank.
Make feng shui slag, dry it, crush it to less than 200 mesh, and use calcium chloride (commercially available) as a stimulant.
As an admixture, blast furnace water slag (105 to 11
After drying at 0°C, mix the sample with 30.5 g of sludge (kaolinite,
(mainly montmorillonite, α-quartz) (however, the stimulant is dissolved in water) is mixed in a mortar kneading pot, and packed into a soil test mold in three layers with a rammer (according to JIS method)1
After months of moist air curing, pressure Wi? Table 4 shows the results of examining i1. The chemical composition and properties of the prototype feng shui sludge are shown in Table 2, and the chemical composition of the additive admixture is shown in Table 3.

Table 2 Table 3 Table 4 As mentioned above, according to the method of the present invention, when silicate rocks, minerals, etc. are added in a molten state to cause a melt diffusion reaction, the melting point viscosity decreases. When slag is turned into water slag in water after being crushed by wind in a wind crushing device, the minerals produced change to mainly glass, and the hardening of sludge becomes stronger than that of slag with no additives. As with the case, it is also possible to harden sludge, etc., and the strength of the mold was strong.

In addition, it can also be used as a binder for briquettes and pellets, similar to blast furnace cement.

Procedure-? Yamamasho (self-motivated) September 14, 1980 Patent Application No. 169632 2, Name of the invention Method of utilizing steel slag 3, Relationship with the case of the person making the amendment Patent applicant address Kokura Kita-ku, Kitakyushu City No. 6-42, 3-chome, Umakure Name: Japan Magnetic Mineral Sensing Co., Ltd. Representative: Hara 1) Kiriri 4, Agent Address: 1-1O-27, Hakataeki Higashi, Hakata-ku, Fukuoka City (1) "Claims column" in the specification! (2) The "Detailed Description of the Invention" section of the specification. (1) The "Claims section" of the specification should be amended as follows.

[1. Utilization of steelmaking slag characterized by adding and mixing blast furnace water slag and calcium chloride after processing the molten steelmaking slag by crushing it with an air stream and letting it fall into water. Method.

2. A method for utilizing steelmaking slag, which is characterized by mixing granite, sandstone, clay blast furnace water slag, and calcium chloride with molten steelmaking slag. (2) Page 5, line 13 to page 5, line 18 of the "Detailed Description of the Invention" section of the specification are amended as follows.

[The present invention aims to provide a method for effectively utilizing the above-mentioned steelmaking slag, and the gist thereof is to crush the steelmaking slag in a molten state by an air flow and drop it into water. This method of utilizing steelmaking slag is characterized by adding and mixing blast furnace water slag and calcium chloride.

Claims (1)

[Scope of Claims] 1. A steelmaking process characterized by adding and mixing blast furnace water slag and calcium chloride to molten steelmaking slag, and then subjecting it to a process of crushing it with an air stream and allowing it to fall into water. How to use slag. 2. Molten steelmaking slag, blast furnace water slag, calcium chloride, granite, sandstone, slate, foundry waste sand, brick waste, coal ash, shirasu, weathered diorite, sand, karami, glass waste, desiliconization slag, and scale. , iron ore, iron sand, shale,
Utilization of steelmaking slag characterized by adding and mixing a modifying material consisting of at least one kind selected from the group of blast furnace slag and red mud, and then subjecting it to a treatment of coarsely crushing it with an air flow and allowing it to fall into water. Method.