JPS6148452A - 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-SiOa, , F-Ca
O, F-MgO, 2CaO-FeJ3, 4CaO-man! zQj -Fe2Oノ, Fe, 104, Fe,
07, FeO, etc., so it has no latent hydraulic properties, and when blast furnace slag is slowly cooled, it becomes melilite (2C).
ILO person ILOt -5iOz~2CaO-MgO・2
It contains CaS (intermediate component of SiOz) and becomes glass-based 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 to 300°C, it expands and collapses when 2CaO-SiO transitions from β to γ, and because it contains F-CaO and F-MgO, it has expansion and collapse properties. Therefore, 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.
Make a water slag so that it is mainly α~β-2CaO-5iOz or mainly glass, or mainly glass such as 1 part α~β-2CaO・SiO. ), , Mast(,Na,
(:03. CaCLL, etc.) was added in a small amount, and water was added and kneaded to obtain hydraulic properties.

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

In addition, even though it is called converter slag, it contains iron in its chemical composition!
There are also cases where electric furnace slag is generated with very little oxidation and reduction phases (one-slug method), which contains iron to the extent that it becomes 2CaO when slowly cooled.
-Fe, Os, 4CaO (JAJ-F e ; pO) is modified into a water slag resulting in stronger strength.

It has a fairly wide range of chemical components and has a high melting point due to its high basicity, which may reduce the scale ratio.

Furthermore, by adding silicate rocks and minerals, α′ to β−
From 2CaO-SiOL main body to 2CaO-SiOL~2C
When aO・Mg0・2SiOL is mainly modified, the melting point and viscosity are lowered, the water slag rate is improved, and the glass becomes mainly glass.
), , cement, etc.) and added water and kneaded it to have hydraulic properties.In order to even out the development of hedoco solidification strength, we added silicate rocks and minerals. It is something.

As an additive, AizOJ or 5iOL alone may be used, but since the melting temperature is high and it is difficult to cause a reaction, it is recommended to add something containing an appropriate amount of 5iO-1Aj2zOt, Fψ5, etc. to lower the melting temperature. It is designed to encourage and ensure that a sufficient reaction occurs.

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 (gas, N4, or human IR).
) and diffuse it.

8. Slag heating furnace (electric furnace method, 04 gas fuel furnace method)
The molten slag and additives, including the partially hardened slag, are introduced into the molten slag and additives.

There are methods etc.

The present invention aims to provide a method for effectively utilizing the above-mentioned steelmaking slag, and its gist is to add fly ash, waxite, weathered basalt soil, fireclay, volcanic ash, weathered clay, temporary Water-cooling treatment after adding and mixing a substance having porazone reactivity consisting of at least one kind selected from the group consisting of baked clay, which can be added to cement to achieve hardening properties, and a stimulant consisting of cement and/or cement clinker. This is a method of using steelmaking slag, which is characterized by subjecting it to.

Incidentally, it is even 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
It was set to 00χ. Others were measured by autoclave treatment using the ASTM method.

*The disintegration rate (DA) was 100% for steelmaking slag (containing) and 35X for steelmaking slag (B).

After drying the above sample in a constant temperature dryer (maintained at 105-110℃) for more than 24 hours, 50Qg
It was then melted again in a siliconite electric furnace (maintained at 1550°C), taken out of the furnace, cooled in water, and made a water slag.
After drying, crush it to about 200 mesh or less, add cement, cement clinker and stone-W (commercially available products) as a stimulant, and wax stone as an admixture (constant temperature dryer + Cr 105
After drying at ~110°C, pulverize to approximately 200/m3 or less), mix this sample with sludge (mainly kaolinite, montmorillonite, α-quartz) with a moisture content of 30.52 in a mortar bowl, and conduct a soil quality test. Table 4 shows the results of compressive strength examination after filling the mold in three layers with a rammer (according to the JIS method) and curing it in a humid air for one month.

The chemical components and properties of the prototype water slag are shown in Table 2, and the chemical analysis values of the admixture added are shown in Table 3.

Table 2 Table 3 Table 4 As mentioned above, according to the method of the present invention, silicate rocks, minerals, etc. are added to steelmaking slag while it is in a molten state to cause a melt-diffusion reaction; By lowering the melting point viscosity and then carrying out a water slag treatment, the resulting mineral becomes mainly glass, and the hardening of sludge etc. is stronger than that of unadded water slag, and is similar to that when blast furnace water slag powder is used. It can also harden sludge, etc., and its strength is high.

It should be noted that it can also be used as a binder for briquettes and pellets in the same way as ordinary cement and blast furnace cement.

Procedure-? Sannosho (spontaneous) September i4, 1980 1, Indication of the case 1989 Patent Application No. 169610 2, Name of the invention Method of utilizing steelmaking slag 3, Relationship with the person making the amendment Patent applicant address Kitakyushu 3-6-42, Magaku, Kokura Kita-ku, City Name: Japan Magnetic Mineral Sensing Co., Ltd. Representative: Hara 1) Meijo 4, Agent Address: 1-1O-27, Hakata Eki Higashi, Hakata-ku, Fukuoka City (1) "Scope of Claims" in the specification (2) The ``Detailed Description of the Invention'' column of the specification (]) The ``Claims Column'' of the specification shall be amended as follows.

1. After water-cooling molten steelmaking slag, it is made into fly ash, waxite, and weathered basalt soil.

Comprised of at least one selected from the group consisting of fireclay, volcanic ash, weathered clay, and calcined clay, which has pozzolanic reactivity and is added to cements to achieve hardening properties, and cement and/or cement clinker. A method of utilizing steelmaking slag characterized by adding and mixing a stimulant.

2. Molten steelmaking slag is provided with pozzolanic reactivity consisting of at least one member selected from the group consisting of granite, sandstone, weathered slate, refractory clay, volcanic ash, weathered clay, and calcined clay, and added to cement. 1. A method of utilizing steelmaking slag, characterized in that it is mixed with a material that exhibits hardenability, and an stimulant consisting of cement and/or cement clinker.

] (2) Page 5, No. 1 of the “Detailed Description of the Invention” section of the specification
Correct lines 9 to 8 on page 6 as follows.

Claims (1)

[Scope of Claims] 1. Porazone 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 in molten steelmaking slag. A method for utilizing steelmaking slag, which comprises adding and mixing a substance that is added to cement to achieve hardening properties, and a stimulant consisting of cement and/or cement clinker, followed by water cooling treatment. 2. Add fly ash, waxite to molten steel slag,
Materials with porazone reactivity consisting of at least one member selected from the group consisting of weathered basalt soil, fireclay, volcanic ash, weathered clay, and calcined clay and that can be added to cements to achieve hardening properties, as well as cement and/or cement. A stimulating material consisting of clinker, granite, sandstone, slate, foundry waste sand, brick waste, coal ash, whitebait, weathered syenite, sand, karami,
A steelmaking slag characterized by water-cooling treatment after adding and mixing a modifying material consisting of at least one kind selected from the group of glass waste, desiliconization slag, scale, iron ore, iron sand, shale, blast furnace slag, and red mud. How to use.