JPS6148472A - 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 is 2CaO・SiOx, F-CaO
, F9MgO, 2CaQ-Feyu03, 4Ca04Rz
Since it contains J4e Yu03, Fe3O4, Fe2O3, FeO, etc., it has no latent hydraulic properties, and when blast furnace slag is slowly cooled, it becomes melilite (2CaO-Am03 ・5
iOJ-~2CaO-MgO・2Si0! +7) Intermediate component) and CaS, and when rapidly cooled, it becomes mainly glass, 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
It is discharged after some time, but when it reaches about 200 to 300'e, it expands and collapses when 2CaO and SiO transition from β to γ.Because it contains F-CaO and F'MgO, it has expansion and collapse properties. As mentioned above, most of the waste is disposed of in landfills.

The present invention relates to a method for solving the above-mentioned drawbacks and effectively utilizing the problems.
It is crushed by an air flow so that it is mainly α′~β-2CaO・SiOx or mainly glass, or partly α′~β-2CaO・SiOx and glass, and then it falls into water and becomes water slag (hereinafter referred to as Feng Shui). (referred to as slag), it was found to have hydraulic properties when dried, crushed and mixed.

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-Fex
After modification of the components produced by 03.4Ca044x03Fe-OJ, the feng shui slag is stronger.

It has a fairly wide chemical composition range and has a high melting point due to its high basicity, which may reduce wind and water slag formation rates.

Furthermore, by adding silicate rocks and minerals, α′ to β−
From 2CaO/SiO Yu to 2CaO3iOz ~2C
When aO- is modified to mainly 0.2SiO-L, the melting point and viscosity decrease, the wind and water slag formation rates improve, and it becomes glass-based.
After drying, it is crushed to give an alkaline stimulant (e.g. CaO, Ca(
OH).

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, Amu03 or SiOyu alone may be used, but
Since the disadvantage is that the melting temperature is high and it is difficult for the reaction to occur, by adding a substance containing appropriate amounts of SiOx, Os, Fe, 03, etc., the melting temperature is lowered and the reaction occurs sufficiently. This is what I did.

How to add additives 1. Pour into the smelting furnace from the beginning or middle of smelting.

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, and add bubbling gas (01, Nx, or human IR).
) and diffuse it.

8. Slag heating furnace (electric furnace method, 0-cis 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. This is a method of utilizing steelmaking slag, which is characterized by adding and mixing the steelmaking slag and then crushing it with an air stream while allowing it to fall into water.

Incidentally, it is more effective to knead granite, sandstone, slate, etc. at the same time as the modifying material. What are the effects of the method of the present invention below? i'l! The following describes the experiments conducted to confirm the results and their effects.

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 002. Others were erroneously determined by autoclave treatment using the ASTM method.

*IFf1 fracture rate (Ni)ba M slug (A) HaroO*
, m slag (H) was 35z.

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, re-melted in a siliconite electric furnace (maintained at 1550℃), taken out of the furnace, tilted the crucible, blew compressed air out of the nozzle, and dropped it into a water tank to create a feng shui slag, and after drying. , crushed to less than about 200 meters, and used as a stimulant for cement and cement clinker.
and plaster (commercially available) as M2 Japanese wood, blast furnace water i/7
(Honmu' + '7 (+ dried (after drying at 105 to 110 degrees Celsius, then pulverized to about 200 mesh) Mix ゛) in a mortar mixing bowl,
Fill the soil test mold with a rammer in three layers (JI
Table 4 shows the results of examining the compressive strength after curing in humid air for one month (using S method).

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. However, when it is turned into water slag in water after being crushed by wind in a wind crusher, the minerals produced change to mainly glass, and the hardening of the sludge becomes stronger than that of unadded water slag. It was also possible to harden sludge, etc. in the same way as when using it, and the strength was rather strong.

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

Procedure-? Yushosho (spontaneous) September 1980, 1981, Jujubi No. 169630 2; Name of the invention: Method of utilizing steelmaking slag 3; Relationship with the person making the amendment; Patent applicant address: Kokura Kita, Kitakyushu City No. 6-42, 3-chome, Kuumaburi Name: Japan Magnetic Mineral Sensing Co., Ltd. Representative: Hara 1) Meisho 4, Agent address: 1-1O-27, Hakata-eki Higashi, Hakata-ku, Fukuoka City (2) "Detailed explanation of the invention" section of the specification 6. Contents of the amendment As shown in the attached sheet, (1) The "Claims column" of the specification is amended as follows.

1. A steelmaking process characterized by adding and mixing stimulants consisting of blast furnace water slag, cement and/or cement clinker after molten steelmaking slag is dropped in the air. How to use slag.

2. A method for utilizing steelmaking slag, which comprises mixing molten steelmaking slag with an stimulant consisting of granite, sandstone, sticky blast furnace water slag, and cement and/or cement clinker. (2) “Detailed description of the invention” in the specification
5th page, line 15 to 6th page, line 1 are corrected as follows.

Claims (1)

[Claims] 1. A treatment in which molten steelmaking slag is mixed with an stimulant consisting of blast furnace water slag and cement and/or cement clinker, and then crushed by an air stream and allowed to fall into water. A method of utilizing steelmaking slag characterized by applying 2. Molten steelmaking slag, blast furnace water slag, and an irritant consisting of cement and/or cement clinker; granite, sandstone, slate, foundry waste sand, brick waste, coal ash;
Shirasu, weathered diorite, sand, karami, glass waste, desiliconization slag, scale, iron ore, iron sand, shale, blast furnace slag,
A method for utilizing steelmaking slag, which comprises adding and mixing a modifying material consisting of at least one kind selected from the group of red mud, and then crushing the slag with an air flow and allowing it to fall into water.