JPS6148468A - 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・SiO2, F・CaO,
F・MgO, 2CaO・Fe, LO3, 4CaO・Im03 ・Fe2O3, Fe3O4, Fe2O3, FeO
When blast furnace slag is slowly cooled, it becomes melilite (2CaO = 8ρ10
It has CaS and an intermediate component of 3-Si02 to 2CaO/Mg02SiOz, and when rapidly cooled, it becomes mainly glass, has latent hydraulic properties, and is used for blast furnace cement) and other materials.

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℃, it expands and collapses when 2CaO SiO transitions from β to γ, and because it contains FCaOlFMgo, it expands and collapses, so as mentioned above, it has a large Parts are being disposed of in landfills.

□ The present invention relates to a method of solving the above-mentioned drawbacks and effectively utilizing the method, and the present invention relates to a method of solving the above-mentioned drawbacks and making effective use of it. While being crushed by an air stream, it is dropped into water to form a water slag (hereinafter referred to as feng shui slag), dried and crushed to form a thealkaline stimulant (e.g. CaO, Ca(OH)): 1.
Hydraulic properties were found by adding a small amount of Na0E [, Nasuλ, CaCjλ, 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. When removed and cooled, 2CaO
F [! After the component produced by U03.4CaO-Aj2a034ez03 is modified, 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・SiOx main body to 2CaO-SiOx ~2
When modified to mainly CaOMgO・2SiOz, the melting point and viscosity decrease, the wind and water slag formation rates improve, and the material becomes glass-based.
After drying, crush and apply an alkaline stimulant (e.g. 1.f (aO,
Ca(DH)λ.

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 additives, A1 03 and SiO Yu alone may be used, but
Since it has the disadvantage that the melting temperature is high and it is difficult for the reaction to occur, it is recommended that the melting temperature be lowered by adding a substance containing an appropriate amount of 5iOz, Henanz03, Fe, etc., so that the reaction will occur sufficiently. This is what I did.

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 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 (0U, Nλ, or Air).
) and diffuse it.

8. Slag heating furnace (electric furnace method, 0U 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 provide a method for effectively utilizing the above-mentioned steelmaking slag. A method of utilizing steelmaking slag, which is characterized by adding and mixing an admixture consisting of cement and a stimulant consisting of cement and/or cement clinker, and then subjecting it to a process of crushing it with an air stream and allowing it to fall into water. be.

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 ASTM method.

*1 The disintegration rate (X) was 100X for SR slag (A) and 35X for steel 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 feng shui slag, dry it, grind it to less than about 200 mesh, and add cement as a stimulant, cement), clinker and gypsum (commercially available products), silicate clay and silica stone as admixtures (in a constant temperature dryer) Dryer at 105-110℃, approx. 200℃
(Crushed to a mesh size or less) and the sample from B was mixed with a moisture content of 30%.
Sludge in 5 (kaolinite, montmorillonite, α
Table 4 shows the results of examining the compressive strength after curing in moist air for one month (JrS 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. When slag is turned into water slag in water after being crushed by wind in a wind crushing device, the minerals produced change to mainly glass, and the hardening of sludge becomes stronger than that of slag with no additives. It is also possible to harden sludge, etc. in the same way as in the case, 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.

Authorization for closing procedure (spontaneous) September 14, 1980 Application for Permission to Hold 18.9628 No. 18.9628 2, Title of invention Method of utilizing steelmaking slag 3, Person making the amendment ・Relationship to the case Patent applicant Address: 3-6-42, Magaku, Kogonkita-ku, Kitakyushu Name: Japan Magnetic Mineral Sensing Co., Ltd. Representative Hara 1) Meijo 4, Agent Address: 1-1O-27 Hakata-eki Higashi, Hakata-ku, Fukuoka-shi "Patent Claim" in the specification (2) Contents of the amendment to the "Detailed Description of the Invention" column 6 of the specification As attached, (1) The "Claims Column" of the specification will be amended as follows.

[1. After processing the molten steelmaking slag by crushing it with an air stream and letting it fall into water, an admixture consisting of an alkali-soluble silica- and alumina-rich material such as silica stone and/or silicate clay, and A method of utilizing steelmaking slag, which comprises adding and mixing an stimulant consisting of cement and/or cement clinker.

2. Granite, sandstone, viscosity 1, NF in molten steel slag
A method for utilizing steelmaking slag, which comprises mixing an admixture consisting of an alkali-soluble silica- and alumina-rich substance such as silica stone and/or silicate clay, 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 old specification
Correct line 7 to page 6, line 5 as follows.

[The present invention aims to provide a method for effectively utilizing the above-mentioned steelmaking slag, and the gist thereof is: steelmaking slag in a molten state -e'X%? ifE is made of silica which has been previously crushed and then allowed to fall into water, an admixture consisting of an alkali-soluble silica- or alumina-rich substance such as silica stone and/or silicate clay, and cement and/or cement clinker. This is a method of utilizing steelmaking slag characterized by adding and mixing a stimulant. ”

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 for utilizing steelmaking slag, which is characterized by subjecting it to a treatment in which it is crushed by an air flow and then allowed to fall into water. 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. Sand, brick waste, coal waste, whitebait, weathered diorite, sand, karami,
After adding and mixing a modifying material consisting of at least one selected from the group of glass scrap, desiliconization slag, scale, iron ore, iron sand, shale, blast furnace slag, and red mud, the mixture is crushed by an air flow and falls into water. A method of using steelmaking slag, which is characterized by subjecting it to a slag treatment.