JPS6148478A - 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 or discarded. The current situation is related to the 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-Mg(17,2CaO・Feyu03,4CaO・J
'zO)-Fe203S Fe)04, F+40
1. Since it contains FeO, etc., it has no latent hydraulic properties, and when blast furnace slag is slowly cooled, it becomes melilite (2CaO
・Am03-5iOyu~2CaO-Mg04SiO;i
(intermediate component) and CaS, and when quenched, it becomes mainly glass, has latent hydraulic properties, and is used in blast furnace cement admixtures, 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 it has expansion and collapse properties because it contains F, CaO, and F-MgO. 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 same.
It is crushed by an air flow so that it is mainly α1~β-2CaO-SiQb or glass, or a part of α'~β-2CaO-SiO is mainly glass, and then it falls into water and becomes water slag.

(hereinafter referred to as feng shui slag), dried and crushed to produce the alkaline stimulants (e.g. CaO-, Ca(OH)2,
NaOH.

) JayuCg3. Hydraulic properties were found by adding a small amount of CaCJ-, 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 are some types of slag that contain very little iron, and electric furnace slag also has a method of producing both the oxidation and reduction phases (one slag method), in which iron content is formed. When slowly cooled, 2CaO
・Fe O, 4Ca0412.03 After modification of the components produced by Fea03, 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 may reduce wind and water slag formation rates.

Furthermore, by adding silicate rocks and minerals, α′ to β−
From 2CaO-SiOu to 2CaO5iO-~2Ca
When the 041g02SiO material is mainly modified, the melting point, viscous drop, wind, and water slag formation rate are improved, and it becomes glass-based. After drying, it is crushed and alkali stimulants (e.g., CaO, Ca(O)
F().

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, SiO (SiO) alone may be used, but
SiO, AJ'AO? By adding a substance containing appropriate amounts of , Fe, 07, etc., the melting temperature is reduced 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 and blow in bubbling gas (OJ-, ?JL, or IR) to diffuse it.

8. Charge molten slag and additives, including postalized slag, into a slag heating furnace (electric furnace method, zero-swamp fuel furnace method).

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,
Materials with pozzolanic reactivity consisting of at least one kind selected from the group of calcined clays and which can be added to cements to achieve hardening properties, as well as calcium chloride, which is crushed by an air flow after being added and mixed, and then immersed in water. This is a method of utilizing steelmaking slag, which is characterized by subjecting it to a falling treatment.

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.

Flood Table 1 *Due to dusting and collapse during the cooling process, 1
It was set as 00%. Others were measured by autoclave treatment using the ASTλ method.

*1 The disintegration rate (X) was 100X for steelmaking slag (A) and 35 for steelmaking slag (B).

The above sample was dried in a constant temperature dryer (maintained at 105-110℃) for over 24 hours.
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, crush it to less than 200 mesh, and use calcium chloride (commercially available) as a stimulant.
, waxite etc. as an admixture (105 to 11 in a constant temperature dryer)
After drying at 0°C, mix the sample with sludge (kaolinite,
Mix montmorillonite and α-quartz (mainly stimulants dissolved in water) in a mortar mixing pot, and fill in three layers with a rammer into a soil test mold (according to JIS method) and cure in moist air for one month. After that, the compressive strength was investigated and the results are shown in Table 4. 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 in the same way as blast furnace cement.

Procedural amendment (self-restraint, September N, 1982, 1985, P.A. No. 169636, 2, Name of the invention: Method of utilizing steelmaking slag 3, Relationship with the person making the amendment, Patent applicant address: Umakure, Kokura Kita-ku, Kitakyushu City) No. 3-6-42 Name Nippon Magnetic Mineral Sensing Co., Ltd. Representative Hara 1) Meijo 4, Agent Address 1-10-27 Hakata Eki Higashi, Hakata-ku, Fukuoka City (1) "Claims column" of the specification (2) ) Contents of amendment in "Detailed Description of the Invention Column" 6 of the Specification As attached, (1) The "Claims Column" of the specification is amended as follows.

1. After processing the molten steelmaking slag by crushing it with an air stream and letting it fall into water, we produce fly ash, waxite, weathered basalt soil, and #1 fire clay.

A substance having pozzolanic reactivity consisting of at least one selected from the group consisting of volcanic ash, weathered clay, and calcined clay, which can be added to cement to achieve hardening properties, and calcium chloride added and mixed. How to use steelmaking slag.

2. Molten steelmaking slag is mixed with ±1 fly ash, waxite, and weathered basalt soil.

Pozzolanic reactivity consisting of at least one selected from the group consisting of fireclay, volcanic ash, weathered clay, and calcined clay is added to cements to achieve hardening properties, and mixed with calcium chloride. A method of utilizing steelmaking slag characterized by the following. (2) Page 6, line 1 to page 6, line 10 of the "Detailed Description of the Invention" section of the specification are amended as follows.

[The present invention aims to provide a method for effectively utilizing the above-mentioned steelmaking slag, the gist of which is to crush the molten MfV4 slag with an air stream while allowing it to fall into water. After that, it is added to cements with pozzolanic reactivity consisting of at least one of the following groups: fly ash, waxite, weathered basalt soil, '#4 fire clay, volcanic ash, weathered clay, and calcined clay. This is a method of utilizing steelmaking slag, which is characterized by adding and mixing a material that achieves hardenability with calcium chloride.

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 to molten steelmaking slag. and the use of steelmaking slag, which is characterized by adding and mixing calcium chloride to cement and then subjecting it to a process of crushing it with an air stream and allowing it to fall into water. Method. 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 to produce cement. Additives to achieve hardening properties, as well as calcium chloride and granite, sandstone, slate,
At least one member selected from the group consisting of foundry waste sand, brick waste, coal ash, whitebait, weathered diorite, sand, karami, glass waste, desiliconization slag, scale, iron ore, iron sand, shale, blast furnace slag, and red mud. 1. A method for utilizing steelmaking slag, which comprises adding and mixing a modifying material consisting of the following: coarsely pulverized with an air stream and then falling into water.