JPS6148463A - 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 expansion and disintegration properties after cooling, so it is used for some MB board materials etc. after aging treatment.
The project concerns the effective use of steelmaking slag, which is currently disposed of mostly in landfills.

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-3iO=, F-CaO
,F'MgO,2Ca04e,0.3,4CaO・person 1
sO, a・Fea, 0*, Fe9oq, Fe
, 0,3, FeO, etc., so it has no latent hydraulic properties, and when blast furnace slag is slowly cooled, it becomes melilite (
2CaO・Alx-5iOz〜2CaO・MgO・2
It contains SiO, an 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
Although it is discharged after some time, when the temperature reaches about 200 to 300°C, it expands and collapses when 2CaO-SiO transitions from β to γ, and because it contains F-CaOXF and 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.
α~β-2CaO-S+0. main body or glass main body, or a part of '~β-2CaO-SiO, and glass main body (
After drying, grind it into a slag to give an alkali stimulant (e.g. CaO, Ca(OH), NaOH, Ha:
Hydraulic properties were found by adding a small amount of 1Co (CaC, etc.) and kneading with water.

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. 2CaO・Fe)
After modification of the components generated by L, 4Ca (L person 1 unit Oa ・FO20%J), the product that has been turned into wind sludge is stronger.

It has a fairly wide chemical composition range and has a high melting point due to its high basicity, which may reduce the rate of slag formation.

Furthermore, by adding silicate rocks and minerals, α′ to β−
2CaO・Sin, 2CaO-SiO1~2C from main body
When modified to mainly aO・Mg0・2S i O:L, the melting point and viscosity decrease, wind and water slag formation rates are improved, and the glass becomes mainly glass.
, 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, ANO21L, Sin, or simple additives may be used, but they have the drawback of having a high melting temperature and making it difficult to cause a reaction, so SiO, ANO, O, ? , FaJ%, etc. are added in appropriate amounts to promote lowering of the melting temperature,
This is to ensure that the reaction occurs sufficiently.

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

2. After tapping into the smelting furnace, pour it into the 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.

? , 3.4.5, 6. Insert the lance pipe, and add bubbling gas (0 U, N%, or human IR).
) and diffuse it.

8. Slag heating furnace (electric furnace method, O2 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 fly ash to molten steelmaking slag.

waxite, weathered basalt soil, fireclay, volcanic ash, weathered clay,
Air-cooling treatment after adding and mixing a substance with pozzolanic reactivity consisting of at least one kind selected from the group of calcined clays, which can be added to cement to achieve hardening properties, and an stimulant consisting of lime and/or gypsum. A method of utilizing steelmaking slag characterized by subjecting it to.

Incidentally, it is more effective to knead granite, sandstone, slate, etc. at the same time 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
I set it to 00. Others were measured by autoclave treatment using the ASTM method.

*1 The disintegration rate was 100 for steelmaking slag (A) and 358 for steelmaking slag (B).

The above sample was dried in a constant temperature MI machine (maintained at 105-110℃)
After drying for more than 24 hours in an electric melting magnesia crucible,
Put 0g into the siliconite electric furnace (maintained at 1550°C), re-melt it, take it out of the furnace, tilt the crucible, blow out compressed air from the nozzle, and cool it in the air.
Make wind slag and crush it to less than about 200 mesh, use gypsum, lime (commercially available products) as a stimulant, waxite, etc. as an admixture (after drying at 105 to 110 degrees Celsius in a thermostatic drying machine, about 2
00 mesh) and mix this sample with a moisture content of 3
0.5X sludge (kaolinite, montmorillonite,
(mainly α-quartz) in a mortar kneading pot, and packed into a soil test mold in three layers with a rammer (according to JIS method)1
Table 4 shows the results of examining the compressive strength after curing in moist air for several months. The chemical composition and properties of the prototype wind slag are shown in Table 2, and the chemical composition of the additive admixture is shown in Table 3.

Table 2 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, and air fragmentation (air quenching) occurs. )
When processed, the minerals produced change to mainly glass, and the hardening of sludge, etc. is stronger than that of unadded water slag. However, the strength was rather strong.In addition, it can also be used as a binder for briquettes and pellets in the same way as blast furnace cement.

Procedural procedure manual (spontaneous) Date of September 1982 Patent Application No. 169621 2, Name of the invention g Method of using steel slag 3, Relationship with the person making the amendment Patent applicant address Kitakyushu City 3-6-42, Umakure, Kokura Kita-ku Name Kuchimoto Magnetic Mining Co., Ltd. Representative Original 1) Notch 4, Agent (1) ``Claims column'' in the specification (2) ``Claims of the invention'' in the specification Detailed Explanation Column 6, Contents of Amendment As shown in the attached sheet, (1) the Claims Column of the specification is amended as follows.

[1. After molten steelmaking slag is air-cooled, fly ash, waxite, and weathered basalt soil are formed.

A substance with pozzolanic reactivity consisting of at least one selected from the group consisting of fireclay, volcanic ash, weathered clay, and calcined clay, which can be added to cement to achieve hardening properties, and an stimulant consisting of lime and/or gypsum. A method of utilizing steelmaking slag characterized by adding mixed soil.

2. Molten steelmaking slag, granite, and sandstone.

Cold treatment followed by fly ash and waxite.

Weathered basalt, fireclay, volcanic ash, weathered clay.

A stimulating forest consisting of at least one kind selected from the group of calcined clays, which has pozzolanic reactivity and can be added to cements to achieve hardening properties, and lime and/or gypsum.
A method of utilizing steelmaking slag characterized by LεiLt. (2) Page 5, No. 1 of the “Detailed Description of the Invention” section of the specification
Correct lines 8 to 7 on page 6 as follows.

``The present invention aims to provide a method for effectively utilizing the above-mentioned steelmaking slag, and its gist is to provide ILC, fly ash,
Weathered waxite, basalt soil.

A substance with pozzolanic reactivity consisting of at least one selected from the group consisting of fireclay, volcanic ash, weathered clay, and calcined clay, which can be added to cement to achieve hardening properties, and an stimulant consisting of lime and/or gypsum. A method of utilizing steelmaking slag characterized by addition and mixing. ”

Claims (1)

[Claims] 1. Pozzolanic reactivity consisting of at least one member selected from the group consisting of fly ash, waxite, weathered basalt soil, fireclay, volcanic ash, weathered clay, and calcined clay is added to molten steelmaking slag. 1. A method for utilizing steelmaking slag, which comprises adding and mixing a substance that is added to cement to achieve hardening properties, and an stimulant consisting of lime and/or gypsum, and then subjecting the steelmaking slag to air cooling treatment. 2. Molten steelmaking slag is provided with pozzolanic reactivity consisting of at least one member selected from the group consisting of fly ash, waxite, weathered basalt soil, fireclay, volcanic ash, weathered clay, and calcined clay, and added to cement. and a stimulant consisting of lime and/or gypsum; granite, sandstone, slate, foundry waste sand, brick waste, coal ash, shirasu, weathered diorite, sand, karami, glass waste, and desiliconization. A method for utilizing steelmaking slag, which comprises adding and mixing a modifier consisting of at least one member selected from the group of slag, scale, iron ore, iron sand, shale, blast furnace slag, and red mud, followed by air cooling treatment. .