JPS6148456A - 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, manufactured SI slag is 2CaO・5iOz, FCaO
, FMgO, 2CaOFezOB, 4CaO-personNz
O?・FeJ3, Fe3O4, Fe.

Since it contains 03, FeO, etc., it has no latent hydraulic properties, and when blast furnace slag is slowly cooled, it becomes melilite (2Ca
O-person j) J35i01~2CaO・MgO2S iO
(intermediate component b) 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, it expands and collapses when Naruto2CaO-SiO transitions from β to γ at about 200 to 300℃, and because it contains FCaOlF・Mho, it has expansion and collapse properties, so the above-mentioned Most of the street is landfilled.

The present invention relates to a method for solving the above-mentioned drawbacks and effectively utilizing the problems.
It is made into a slag so that α'~β-2CaO・SiO is mainly composed of mainly glass or α'~β-2CaO-5iOz is mainly composed of glass, and after drying, it is crushed and used as an alkaline stimulant (e.g. (OH)1, NaOH,Na
It has been found that when a small amount of LCO3, CaC9, etc.) is added and kneaded with water, it has hydraulic properties.

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

Furthermore, even though converter slag is used, there is also slag that has a very low iron content due to its chemical composition, and electric furnace slag also has a method in which both the oxidation and reduction phases are produced (one slag method).
Contains iron to a certain extent, and when slowly cooled, 2CaO-Fe
L03. ．． 4Ca04JJ3 After modification of the components produced by Fe-03, the product that has been turned into wind slag is stronger! Also comes out.

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

Furthermore, by adding silicate rocks and minerals, α1 to β-
From mainly 2CaO-SiOz to 2CaO-SiOz ~2
When modified to mainly CaO-MgO/ZSiO, the melting point and viscosity decrease, the slag rate improves, and it becomes glass-based.
[)>, cement, etc.) and added water and kneaded it to have hydraulic properties.In order to even out the development of sludge solidification strength, we added silicate rocks, minerals, etc. It is something to do.

As an additive, it is human J! hJ, 5i (h alone may be used, but the disadvantage is that the melting temperature is high (reaction is difficult to occur)
Therefore, by adding a substance containing an appropriate amount of SiO, artificial, Fe, etc., 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 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.

7. 3, 4, 5.6. Insert a lance pipe-like object and blow bubbling gas (0, NLl, or human) to diffuse it.

8. Slag heating furnace (electric furnace method, zero 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 steelmaking slag described above. This is a method of utilizing rope-making slag, which comprises adding and mixing an admixture consisting of:

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

In order to confirm the effects of the method of the present invention, +r.

The experiments conducted and their effects are shown.

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 0oz. Others were measured by autoclave treatment using the ASTM method.

*1 The disintegration rate (%) was 100X 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, cooled in the air, and made a wind slag. Cement, cement clinker and gypsum (commercially available products are used) as stimulants, silicate clay and silica stone as admixtures (after drying in a constant temperature dryer at 105 - no. z, reduce to about 200 mesh or less) This sample was mixed with sludge (mainly kaolinite, montmorillonite, a-quartz) with a moisture content of 30.5X in a mortar mixing pot, and packed into a soil test mold in three layers with a rammer (according to the JIS method). ) Table 4 shows the results of examining the compressive strength after curing in humid air for one month. The chemical composition and properties of the prototype wind slag are shown in Table 2, and the chemical analysis values of the added admixture are 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 melting and diffusion reactions, the melting point viscosity decreases and wind Air crushing using a crushing device (
When treated with air quenching, the minerals produced change to mainly glass, and the hardening of sludge etc. becomes stronger than that of unadded water slag,
It was also possible to harden sludge, etc. in the same way as when blast furnace water slag powder was used, and the strength was rather strong.

In addition, it can also be used as a binder for briquettes and pellets in the same way as ordinary blast furnace cement.

Procedural amendment (1st date, September 1982, 2nd title, Method of utilizing steelmaking slag 3, Relationship with the person making the amendment) Patent applicant address: Uma (FF 3-6, Kokura Kita-ku, Kitakyushu City) No. 42 Name: Japan Magnetic Mineral Sensing Co., Ltd. Representative: Hara 1) Meisho 4, Agent Address: 1-1O-27 Futa-eki Higashi, Hakata-ku, Fukuoka City (1) “Claims column” of the specification (2) Specification Contents of the amendment in "Detailed Description of the Invention Column" 6. As attached, (1) "Claims Column" of the specification will be amended as shown below.

[1. Addition of an admixture consisting of an alkali-soluble silica- and alumina-rich material such as silica stone and/or silicate clay, and a stimulant consisting of cement and/or cement clinker to the cooled molten steel slag A. A method of utilizing steelmaking slag characterized by the following.

treated and then an admixture consisting of an alkali-soluble silica- and alumina-rich material such as silica stone and/or silicate clay;
1. A method of utilizing steelmaking slag, which comprises mixing it with a 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 4 to 1 of page 6 as follows.

Claims (1)

[Claims] 1. An admixture consisting of an alkali-soluble silica- and alumina-rich material such as silica stone and/or silicate clay, and a stimulant consisting of cement and/or cement clinker are added and mixed to molten steelmaking slag. A method of utilizing steelmaking slag, which is characterized by subjecting it to subsequent air cooling treatment. 2. Adding to molten steelmaking slag an admixture consisting of an alkali-soluble silica- and alumina-rich material such as silica stone and/or silicate clay, an stimulant consisting of cement and/or cement clinker, and granite, sandstone, slate, foundry waste. Modification consisting of at least one selected from the group of sand, brick waste, coal ash, weathered whitebait diorite, sand, karami, glass waste, desiliconization slag, scale, iron ore, iron sand, shale, blast furnace slag, and red mud. A method of utilizing steelmaking slag characterized by performing air cooling treatment after adding and mixing materials.