JPS6148475A - 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 ability to expand and disintegrate after being cooled, so after aging treatment, it is partially used for roadbed materials, etc., but most of it is disposed of in landfills. The current situation is related to the effective use of steelmaking slag.

s! ! There are various types of steel slag, but the present invention targets converter slag and electric furnace slag (reducing stage).

Generally, steelmaking slag is 2CaO-SiO, F・CaO,
F・MgO, 2Ca04e:LO? , 4C 龜0-kl
sol-Fe:5-Gy, FezQ4, Fez
Since it contains Qz, FeO, etc., it has no latent hydraulic properties, and when blast furnace slag is slowly cooled, it becomes melilite (2Ca).
O-jJ'J3-5iOz~2CaO-IJgO-2S
Blast furnace cement!
It is used for trading etc.

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 the temperature reaches about 200 to 300℃, it expands and collapses when 2CaO/SiO transitions from β to γ, and because it contains F-CaO and F-MgO, it expands and collapses. Therefore, as mentioned above, most of it is disposed of in landfills.

The present invention relates to a method for solving the above-mentioned drawbacks and effectively utilizing the above-mentioned drawbacks.
It is crushed by an air flow so that it is mainly α~β-2CaO・SiO or glass, or a part α′~β-2CaO-SiO is mainly glass, and then it falls into water and turns into water slag (
(hereinafter referred to as feng shui slag), dried and ground to produce alkaline stimulants (e.g. CaO, Ca(0■)), NaOH.

Hydraulic properties were found by adding a small amount of Na5CpJ, CaCf, etc.) and kneading with water.

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.
・After modification of the components produced by Fea03.4CaO9, the feng shui slag is stronger.

It has a fairly wide range of chemical components, and has a high melting point due to its high basicity, which has the advantage of reducing wind and water slag formation.

Furthermore, by adding silicate rocks and minerals, α′ to β−
When modified mainly to 2CaO・5ib・2SiO, the melting point and viscosity decrease, and the wind,
The water slag formation rate also improves, and the glass becomes the main component, and after drying, it is crushed to form an alkali stimulant (for example, CaO, Ca(OH):L).

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, SiOx alone may be used, but since the melting temperature is high and it is difficult to cause a reaction, it is recommended to use one containing appropriate amounts of SiO, Jb 03, Fe, 03, etc. By adding it, the melting temperature is lowered and 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, pour into the smelting furnace.

-3, Pour into contact with the slag flow discharged from the smelting furnace. (
(simultaneous injection) 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 (O, X, or Air).
) and diffuse it.

8. Into a slag heating furnace (electric furnace method, 03-gas fuel furnace method), molten slag including postalized slag and additives are charged.

There is a way.

The present invention aims to provide a second method for effectively utilizing the above-mentioned steelmaking slag, and its gist is to apply fly assining to the molten steelmaking slag.

waxite, weathered basalt soil, fireclay, volcanic ash, weathered clay,
After addition and mixing of at least one material selected from the group of calcined clays, which has porazone reactivity and is added to cements to achieve hardening properties, and an stimulant consisting of lime and gypsum, the mixture is coarsely crushed with an air stream. However, this is a method of utilizing steelmaking slag, which is characterized by subjecting it to a treatment in which it is 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 to 00x. Others were measured by autoclave treatment using the human STI+ method.

*The disintegration rate (x>) was 100X for steelmaking slag (A) and 3SX 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 a feng shui slag, dry it, and then crush it to about 200 mesh or less. As a stimulant, use gypsum, lime (commercially available products are used), as an admixture, waxite, etc. (in a constant temperature dryer at 105-110℃)
This sample was mixed with sludge (mainly composed of kaolinite, montmorillonite, and α-quartz) with a moisture content of 30.5x in a mortar bowl, and poured into a soil test mold with a rammer. Fill it in layers (
Table 4 shows the results of examining the compressive strength after curing in humid air for one month (according to JIS 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. After being crushed by wind in a wind crushing device, the minerals formed become mainly glass, resulting in sludge, etc.! Hardening is also stronger than that of non-added water slag, and it is also possible to harden sludge, etc. in the same way as when blast furnace water slag powder is used, and the strength is rather strong.

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

Procedural amendment (1 reference) September J, 1982

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. The method is characterized in that a substance that is added to cement to achieve hardening properties and an stimulant consisting of lime and gypsum are added and mixed, and then a treatment is performed in which the cement is crushed by an air flow and then allowed to fall into water. How to use steelmaking slag. 2. Add fly ash, waxite to molten steel slag,
Materials with porazone reactivity consisting of at least one selected from the group consisting of weathered basalt soil, fire-resistant clay, volcanic ash, weathered clay, and calcined clay, and which can be added to cements to achieve hardening properties, lime and/or gypsum. Irritating materials consisting of granite, sandstone, slate, foundry waste sand, brick waste, coal ash, whitebait,
Weathered syenite, sand, karami, glass scum, desiliconization slag,
After adding and mixing a modifying material consisting of at least one kind selected from the group of scaled iron ore, iron sand, shale, blast furnace slag, and red mud, the material is crushed by an air flow and then allowed to fall into water. A method of using steelmaking slag characterized by: