JPS62241850A - Use of de-p-s 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] <Industrial Application Field> The present invention compares the basicity generated in the de-S and de-P treatment steps, which are one of the preliminary treatments for hot metal that have become popular in recent years. P. This relates to a method of using slag containing a large amount of S.

<Conventional technology> Until recently, hot metal was treated to remove Si and S, and the S was removed in a converter.

This was a steelmaking method that involved removing P and carbon. However, with the development of steelmaking technology, S was removed from the hot metal pretreatment process.

Now dephosphorization is carried out at the same time, and Cab is used as an additive.

It has become possible to do this efficiently by using Fed, CaFz + PezOz, MnO, etc., but this slag has a high P and S content and if used as a sintering raw material, it will be reduced in the blast furnace and returned to the hot metal, so a large amount of slag is required. It is necessary to use a P-8 removal agent.

Also, this slag has a small amount of 5iOz+^l 20 (
Because it contains a lot of CaO, it has a relatively high basicity and F-CaO
Because it expands and collapses a lot, it cannot be used as roadbed material.
When used as a raw material for cement, it cannot be used in large amounts because it contains a lot of P and delays the setting of cement.

Therefore, at present, this type of P-S-free slag has little utility value and is mostly disposed of in landfills.

<Problems to be solved by the invention> The reason why the above-mentioned P-S slag is not utilized is that F.Ca.
If it absorbs a lot of moisture or water, it will expand and collapse, so it cannot be used for roadbed materials, etc.

Also, P. Since the content of S is high, when it is recycled as a sintering raw material or a raw material for blast furnaces, etc., a large amount of P and S will be contained in the hot metal, and the
-The use of s-agents has increased and the amount of slag generated has also increased.

When used as a raw material for cement, the P content is high, which increases the concentration of P in the clinker and slows down the setting time, both of which are inconvenient, so most of it is disposed of in landfills.

The present invention eliminates the non-hydraulic property by changing the cooling conditions (water dregs, wind crushing, slow cooling) and basicity (Cab/Sing) of the P-S slag, and P, S, CI, etc. The purpose is to provide a method for effectively using sludge as a sludge hardening material, soil improvement material, etc., which does not cause any problems.

The present invention aims to impart latent hydraulic properties to de-PS slag and utilize it in a wide range of applications. DeP- in the molten state
The basicity (Cab/Sta) of the S slag is
g) Add lime 2 limestone or carbide gas in an amount that should give a value of 5 to 9, place a lid on the lance vibe, and perform bubbling by blowing oxygen, air or nitrogen, or Using an electric furnace method, the slag is covered with a lid, an electrode is inserted, electricity is applied to cause a melting reaction, and then the slag is cooled and crushed, and the slag that has been deironated by magnetic separation is crushed 2
Crushed slag, fly ash, crushed blast furnace water slag, Boltland cement mouth, pulverized siliceous mixture (containing 60% or more of total silica) from which iron has been removed through magnetic separation
This is a method of utilizing P-S-free slag, which is characterized by mixing one or more of these and using it as a sludge hardening agent and soil conditioner.

In addition, deP of the molten state after modification. The S slag may be cooled by slow cooling, water cooling, or air cooling, but the slow cooling method is advantageous in terms of cost since it does not require water slag equipment, wind crushing equipment, drying equipment costs, or fuel costs.

Usually, it is finely pulverized so that the Blaine value is about 3100±50 c11/g.

<Examples and Effects> The following will show experiments conducted to confirm the effects of the present invention and their results.

Chemical composition of the P-S slag used in this experiment.

The main minerals contained, the chemical composition of converter slag for comparison, and the main minerals contained are shown in Table 1 below.

The P-S-free slag mentioned above is slowly cooled slag obtained by injecting the P-3 agent into the hot metal in the torpedo car, discharging the molten slag into a ladle, tilting it, and discharging it into the field. be.

In addition, the molten slag before being tilted and discharged into the field as described above is scooped up with an iron ladle, cooled in water, and the water slag is then spread on the ground with thin iron plates and blown into the air using compressed air. (sometimes to the extent that it turns black) to produce wind-crushed slag.Table 2 shows the main minerals contained in these water slags and wind-crushed slag.

Among slowly cooled slags, N has low basicity (CaO/SiO2)
Non-In kimono (5 mm or less) subjected to crushing and magnetic separation of o.6
Lime is added to the liquid, placed in an fused magnesia crucible, remelted at 1400°C in a siliconite electric furnace, cooled in water to form a water slag, and blown off with comb air, cooled in the air, and cooled in the air. Table 3 shows the chemical analysis values and main mineral content of the crushed slag.

Next, these slags were dried in a constant temperature dryer kept at 105 to 110°C for 24 hours or more, and then ground into single pieces, fly ash, ground blast furnace water slag, Portland cement,
A crushed product of siliceous mixture material (containing 60% or more of total silica) was blended with a JIS mortar composition, and water was added to each mixture and kneaded, and then the hardening status was examined. The results are shown in Table 4, and the results of the sludge solidification test are shown in Table 5.

Next, the agglomeration and granulation tests will be described.

Fine ore (particle size distribution is shown in Table 6) was prepared and examined as a binder for use as a raw material.

First, as a preliminary test, we conducted a concrete compression tester (Lo
ot) and molded using the tablet method (32φ
×3511II11, molding pressure 1 t/ci, added moisture 4
．． 5%) and the results of measuring the crushing strength over time are shown in Table 7.

For those with good composition, briquette Ja (50X 50
X 321III+, added moisture 5%, linear pressure 3.3t/
Table 8 shows the results of measuring the dough yield, crushing strength, etc.

When molding by the tablet method as shown in Table 6 and above, the tablet is removed and moved by hand when taken out of the mold, so it does not break at all, and if it is left to cure as it is, even if it is made of ordinary cement, it will have long-term strength and there will be no problem.

However, when making briquettes using a briquetting machine, about 35 to 40
Since the pellets fall by 1.5 cm and are destroyed when transferred to a belt conveyor, the yield of the dough will be better if it can be strengthened in a few minutes after kneading and before being compressed. In other words, if only cement is used, it will be destroyed in this initial process, and even if bentonite is used as a thickener, the effect will be small, but if cement is used, the effect will be greater if pulverized S slag, which hardens in a few minutes, is used. I understand.

Next, for the fine ore having the particle size distribution shown in Table 9,
Same as shown in the table; mix the prototype (shown in Table 4) etc. so that it is not mixed, and sprinkle with water about 10 to 15 m1.
Table 10 shows the granulation properties and drop strength when granulated to No. 1.

Table 9 Table 10 *1 *2 *After 13 days, the number of times it is dropped from a height of 1 m onto a 10 mm thick iron plate until it reaches approximately 172 *Compressive strength after 23 days From Table 10 above Powdered ore with poor plasticity cannot be granulated even if cement, cement and bentonite are mixed together, or blast furnace slag, lime and bentonite are mixed together. Of course, if a larger amount is mixed while ignoring the deterioration in quality, granulation can be achieved, but it cannot be used in practice.

However, according to the method of the present invention, lime is added as a stimulant to the P-S-free slag, or cement 3 fly ash,
When a mixture of silicate rock, blast furnace water slag powder, etc. is used, granulation can be performed well.

<Effects of the Invention> As described above, according to the method of the present invention, the metal does not harden in its original state, contains a large amount of P-3, and may contain a considerable amount of NatO and C1, which has little utility value. After collection, it is disposed of in a landfill, but even if it is finely pulverized and mixed with sludge, etc., those with high basicity will harden, but those with low basicity will not harden, or even if they harden. Only weak strength is produced.

Therefore, when the basicity is increased to about 5 or more, the strength decreases in the order of water slag, air crushed material, and slowly cooled material, but even slowly cooled materials can be pulverized alone, or this finely pulverized material can be combined with fly ash, blast furnace water, etc. Crushed slag, Portland cement.

When mixed with a crushed siliceous material (containing 60% or more of total silica), etc., it can exhibit the property of curing in a shorter time than cement, and can be used as a sludge hardening agent. It can be effectively used as a binder for pellets and briquettes, which are raw materials that do not cause problems even if they contain P-8.

Patent Applicant Nippon Magnetic Mineral Sensing Co., Ltd. Procedural Amendment (7 Vision June 30, 1985 1, Case Description 1985 Patent Application No. 83369 2, Name of Invention Method of Utilizing P-S Slag Removed 3, Amendment Relationship with the case of the person who did the patent application Address of the patent applicant: 3-116-42 Magaku, Kokura Kita-ku, Kitakyushu City, Showa 6
5, June 24, 2015, Contents of the amendment 6. Contents of the amendment As shown in the attached document, "3. , add the phrase "detailed description of the invention".

Claims (1)

[Claims] 1. DeP in a molten state containing partially solidified slag
．． The basicity (CaO/Si
After adding lime, limestone or carbide gas in an amount such that O_2) is 5 to 9, placing a lid on the lance pipe, and bubbling by blowing oxygen, air or nitrogen, or In an electric furnace method, a lid is placed on a ladle, an electrode is inserted, electricity is applied to cause a melting reaction, and then the slag is cooled and crushed, and the pulverized slag that has been deironated through magnetic separation, fly ash, and blast furnace. Ground water slag, Portland cement, ground siliceous mixture (total silica content 60%)
A method for removing P, characterized in that it is a mixture of one or two or more of the above (including the above) and used as a sludge hardening agent, a soil conditioner, and a binder for pellets and briquettes. How to use S slug. 2. The de-P. How to use S slug. 3. The de-P. How to use S slug. 4. The method for removing P as set forth in claim 1, wherein the cooling treatment is an air crushing treatment (semi-quenching). How to use S slug.