JPS5953613A - Method and device for treating steel making slag - Google Patents

Abstract

PURPOSE:To fractionate the steel making slag in a molten state to a ground metal to be used as raw material for steel making and others by admixing a flux to said steel making slag to induce melting reaction and to decrease viscosity then dropping the slag onto a receiving tray made of steel and cooling quickly the slag and further subjecting the cooled slag to grinding, magnetic separation and sieving. CONSTITUTION:A receiving tray 1 consisting of a steel plate 3 projected with a frame body 2 for preventing overflow at the peripheral edge, is laid with refractory bricks 4 embedded in the places to receive the dropping molten mixture and is flowed with cooling water between the flat plates 2 and 3 is prepared. On the other hand, >=1 kind of silicate rock, ores, blast furnace slag, etc. are admixed at 5-30wt% to the steel making slag in a molten state contained in a vessel 10 for contg. the mixture to decrease the viscosity of the steel making slag by the melting reaction. The steel making slag having the decreased viscosity is dropped into the bricks 4 of said tray 1 and is quickly cooled to progress vitrification. The vitrified steel making slag is subjected to grinding, magnetic separation and sieving. Whereby the slag is fractionated to the ground metal to be used as raw material for steel making and the rest to be utilized for sand such as for sand blasting.

Description

[Detailed Description of the Invention] Present invention 1.1? 'l The leached water from the fN slag is kept close to neutral and does not contain harmful substances, and is separated into effective metals such as V and slag and other materials, and the tllll gold is used as a raw material for steelmaking, and the other materials are This article relates to a method and apparatus for processing slag, which is intended to be effectively used as sand for sandblasting, sand, etc.

The converter slag is r and β-2CaOsSiO, FeCsO (
3tfrNT lime) and Gehlenite (2CRO/A
,,/,03・S〼Ot) Akermanite (2CaO-
MgO-2SiO2), magnetite (Fe, 04)
Hematite (Fe, 03), Ustai 1 (Fe+
O) etc. Special converter slag is produced by Pericles.
(MgO) may also be present, and the oven treatment (ASTM method, 2 FI 0°C, 20 to 2/era
, 3 o'clock u (I ffd holding te 25-I 0-rq (7)
If 1 degree PT and 10M1: J are used as decaying material, the result will be approximately 30 JTjμ.

% disintegration, pII is about 110-1 when dissolution test is performed.
15 is shown.

11rl air furnace slag is roughly divided into oxidized slag and reduced slag, and the former is ha/? andhi (! 2C*O・S+O, ni, 10 'l
i' 1. t r −2CaO-8i02-rich case and 3Cno・2 S t O! The disintegration rate of the former is approximately 10% by weight or less, while the latter undergoes expansion disintegration (dusting) during the cooling process and disintegrates 100% by weight. ■ indicates approximately 11.0 to 114.

Ferrochrome slag is mainly composed of spinel (MgO・Sin) forsterite (2Mg0@S No. 02), furcynite (FeO@A403), and enstatite (M
ho@Sin, ) etc.1 and has no disintegrability, but Cr
, O, containing about 611% to 7-membered chromium ions, and when eluted according to the method notified by the Environment Agency, the total amount of chromium ions is about 0.0%. lppm~2
Elutes ppm.

In addition, special za (1 slag Ltr and β-2C: no-8: O
,,P'-CnO-2CaO-Mg0-2CaO-,2
CnOaAI, 0s-8in, + Te (off-site (CnO-R4gOψ2S sat ), etc.), C
r, 03wo approx. 6 heavy ships X~773. Contains KL%, and when eluted using the same method as above, the chromium ion powder contains about 100 ppm-
- It elutes at 75 ppm and disintegrates at about 781 Hit%. When an elution test is performed, the pTI is about 11.0 to 115.

Ko11u (7) collapse?ノJi5t Inha, F-CnO,
MgO,'1CnO-8iO,,3CRO@2SiO2
This is due to

The present invention solves the above-mentioned problems and improves melting ay 6n re
Effectively utilize the sensible heat of - or IJQ! ! i
If you have to abandon the ship with only s, supplement the evening heat as necessary.
r! I, Method and equipment for treating 9 can slag
ll1ku1 (A, and the beak, the gist of which is molten H1
Add 5 to 30 types of silicate rocks and minerals, red mud, J. slag, horn waste sand, blast furnace slag, coal ash, and dust to the soil in condition 1. Add M% and mix to initiate a melting reaction! 1 After creating the viscosity (IC),
A fire-resistant girder was laid at the place where the above 611 compound would fall, and cooling water was poured inside. It is characterized by discharging the metal into a saucer for each production to rapidly cool it and proceed with vitrification, followed by crushing, AT sorting, and sieving to separate the bullion and other materials.
Steelmaking juice in the 11 process or melting state, silicate rocks and minerals, red mud, karami, casting Takasago, blast furnace slag,
A container for containing a mixture of stone ash and dust, a transporting and charging device for carrying the container to a raiding place and dumping the contained mixture into the above-mentioned saucer; Refractory bricks are laid in the first place where the input falls, and inside the first place there is an iron or iron lug with a cooling water passage formed.
This is a 1 tsubo rice cake processing device that is comprised of a rice cake receiving tray and a conveying device that collects the cooled and solidified mixture in the same receiving tray and transports it to the next process for crushing, magnetic separation, and sieving.

The following methods are available for adding additives such as the above-mentioned silicate rocks and minerals, red mud, karami, foundry sand, blast furnace slag, coal ash, and dust to steelmaking slag.

(i) Production 1 Inject steel into the furnace from the beginning or during the process.

■ Take it out to the Pi-furnace and then put it in.

■Put it in contact with the molten metal discharged from the steelmaking furnace.

■ Falling of the molten slag from the medium furnace ((f) is thrown in contact with the oka.

(5) Use it as a substitute for the slag removal trowel.

(a) Add the molten slag to the iJj slag in a sandwich-like manner.

■ (Pregnant) Charge according to the method of ■■■, insert a lance-shaped object, blow bubbling gas and perform bubbling with A.

(i) After pouring 49゜ into the ladle before the end of continuous casting, drain the slag into a ladle.

In addition, for neutral or slightly alkaline slag and slag.
- Since there are many negative 1 additions of additives mentioned above, the method (2) (, S) < V is effective in order to effectively utilize the phase heat.

Here, while the slag is in the molten state,
, A/40° and the above-mentioned unused armament sources and industrial waste containing Fe2O3 etc. are added to the melting system 17 fi.
This is to effectively utilize the heat insulation of the slag, and with the additive and 17 S r 02 or A/, 0. Although it is sufficient to use only 8i0. , A, /! , (1) Since the melting temperature is high when used alone, reactions occur and there is a drawback.

Next, experimental results regarding the 11 methods for treating y and Im slag of the present invention will be described below.

First, Table 1 shows the chemical analysis values (weight/%) of the raw materials used in this experiment.

After drying these samples in a constant temperature dryer at 105-110℃ for more than 24 hours, the additives such as slag and red mud were crushed with a non-pull grinder for 3 or more times (however, fine dust was removed). Therefore, with the grain size of the grain), magnetic selection was carried out only for chain-forming properties, and the siegel cone was made by framing to 03 parts or less, and the weld wetness was determined to be 1f111. The results are shown in Table 2.

Further, using the same sample, the absolute viscosity was determined at t111 at each temperature using a crucible rotation type viscosity measuring device. The results are shown in Table 6.

Put the magnetic tailings, etc. of 3- or less into an electric, fused magnetite crucible and hold it at 1550℃ for 15 minutes. Add additives such as silicate rocks, etc. 7. After about 3 minutes, take out the crucible at +1V, and as shown in Figures 1 and 2,
) on top so that its thickness is about 20 millimeters wide 'fL! /i
Q sweat, rapid cooling → 1, the rapid cooling solid material has a particle size of 5
- The specific gravity, elution test, Vickers hardness, etc. were measured by crushing the pieces as much as possible.The results are shown in Tables 4 and 5.
Shown in the table. For comparison, the properties of 1-table material slag are shown in Table 6, and the elution test sample 114 of raw material R is shown in Table 7.
I don't know what to do.

1 (J-i, the content of F.Coo was o, on 1+r for all of the test samples shown in Table 4 above, and the simplification rate was 000mj, lxJ).

The abbreviations of the minerals listed in Tables 4 and 6 are as follows.

sp......MgO fist A/, 20°FO...
......2Mg0-8iO.

En......MgO・Si02Mf...
...MgO・F/! ,0゜β-C,S...β-
2CaO・S i02γ-C,S・-r-2C,0a
sis.

AK......0-MgO-28iO in 2C.

Ge---2CaO-A40. -8iO.

C^S...Cll5 FIICRO=-Free++Ca0 Jlu...Fe, 0. .

Mg・・・・・・F' e 30゜Wu...
......FfIO C,A-=-"・'3C1OIIA4 (13Also, for the products shown in Table 5 above, Cu+T@Cr+
Cd, Ph, Zn, FH,! 4n, A
The eluted ion concentrations of s and Tang were also measured, but none of them were detected. Also, the above 7th
Regarding the raw materials shown in the table, in addition to T-Cr and Fu ions, Cu, Crl, Pb, Zn, R4
n, AII, T*I], and g, but these ions were not detected in all of them.

Next, the apparatus of the present invention will be explained with reference to the drawings.The receiving tray (1) for rapidly cooling the molten mixture of additives such as molten steel slag and red mud is as shown in FIGS. A flat plate (3) made of iron or steel with a sharp protruding frame body (2) for preventing overflow on the periphery, and a surface 1 is provided at the part where the molten mixture is poured. J the brick (4)! +!
It is laid in the shape of a building. And t! Alternatively, two flat plates made of steel are arranged in parallel with each other at a certain interval, and between the first and each flat plate, a plurality of ribs (5) for maintaining the distance are arranged at various places. The space between the two flat plates (11ii) is formed in this way.
6) allows cooling water to flow through it. In the illustrated example, a water supply pipe f71 is passed through the terminal end side of the saucer so that both ends of the water supply pipe F71 are exposed on both sides of the saucer (1), and water is supplied from both holes 14 of the water supply pipe (7).
tl″f1 The space (
6) Water is supplied to the lower side of the saucer (1) where the mixture is poured, and a portion of the mixture is poured onto both sides of the saucer (1). The structure is such that the water flows into the pipe (8), sinks in, and drains from both ends of the drain pipe (8). As shown in Fig. 2, the base end of the one located at the right end (right end) should be able to rotate around the rotating shaft (9), and after the mixture has cooled and solidified, the Souffleper etc.ii1'i'M,
If the cooling mixture is discharged to IIV in stage F, 14: + tr +/ζ is set for 17 hours.

Next, the entire framework of the present invention ν/threshold is not shown in FIG. -1 is transported by transport 11 (loading device 01) consisting of a transport cart or beam 1-noon, etc.
, above mentioned receiver 1111 (This is for pouring the molten mixture onto surface 11. Also, from the end of receiver m1 (1), a heat-resistant conveyor or other conveyance device is installed from the end to the end. (Bayr is placed and Uke 1711 fl
>, J: The mixture cooled and solidified is placed on the iIR feeding collar using a necessary means such as a diopel or sufu tube and transferred to the next step. Here, the next steps are crushing, magnetic separation, and sieving, and these steps are performed by repeating known methods several times.

Next, specific examples will be shown.

This example is a complete set of 11v air furnace, converter slag, special
Melt slag etc. in 500 and melt it, slate fe 5Qk7 below in contact with the molten slag in the mountains, or slate in the furnace before tapping;
] After adding the mixture, the ladle Iζ was lifted by a crane Il, and the mixture was discharged into the quenching apparatus shown in FIG.

After about 20 to 30 minutes, discharge, slag I, 1 hand, 'Sao)
The thickness of the discharge layer was approximately 35 rtn at the I-1 town, and 20 to 0.5 cm in other areas.

After crushing this slag with a jaw crusher (approximately 15F or more), the tailings are further crushed with a roll crusher (at intervals of 5
-) and sieved, sandblasting sand test, 2111 aggregate test for ascon, crushed material test for roadbed material, and crushing test using an all-hole hoop (ASTM method: 2111 aggregate test)
~25 seeds were treated (less than 7.10 seeds were treated as powder)
In addition, elution tests were conducted according to the method notified by the Environment Agency, and the results are shown in Table 8.

As described above, according to the present invention, an appropriate amount of the additives mentioned above, including silicic acid J14 rock, is added to the silicate furnace slag, so that the melting point of the silicate furnace slag reaches Pli silicon. The viscosity is lowered and the reaction can be carried out sufficiently, and most of the mixture is vitrified by the subsequent cooling using an apparatus rt using a water-cooled saucer. t
There is no elution of harmful ions, and P11 is also close to neutral.

Therefore, other materials other than bare metal are also useful in all fields, such as J-sindo blast sand (moderately sharp angle and great abrasive power), Tsuchigazuki 1 sand, roadbed material, caisson filling material, etc.)
lt, 19.

Furthermore, the cooling water flowing in the saucer is
r Orgy is appropriate heat exchange 1! J! 4. Use: 1. It is useful for effective use.

[Brief explanation of the drawing]

FIG. 1 is a partly cutaway plan view of the saucer of the unexploded intercalator PI, FIG. 2 is a 1411-view view taken along the line A-A in FIG. 1, and FIG. 3 is a general schematic view of the device N of the present invention. In the figure, (1): Receiving tray 01: Mixture storage container (Ill: Transporting and charging device West O mite transporting device y7 Patent applicant: Japan Magnetic Mineral Sensing Co., Ltd.

Claims (1)

[Scope of Claims] 1. 5 to 30 heavy carpets of one or more of the following are added to the molten steel slag: porphyry rocks and minerals, red mud, karami, cast iron sand, furnace slag, coal ash, and dust. % added and mixed to cause a melting reaction and a decrease in viscosity, and then firebricks were laid in the area where the above mixture would fall, allowing cooling water to flow inside the iron or #+! The special feature is to discharge the water onto a stainless steel tray and rapidly cool it to proceed with vitrification, followed by crushing, magnetic separation, and sieving I3 to separate the metal from other materials! ll! l How to dispose of sludge. 2 It is in a molten state! P! ! A container containing a mixture of slag and one or more of the following: acid rocks and minerals, red mud, karami, cast iron sand, blast furnace slag, coal ash, and dust, and the ablution container are transported to the required location and stored. Transport 31 (loading and loading) of throwing the mixture onto the tray described below (2. Alternatively, a lead saucer and the same saucer] collect the cooled and solidified mixture for the next crushing, magnetic separation,
IJI consists of a transport device that transports the sieve to the process.
I Descendant 11 Slag Processing Bag-0