JPS5842713A - Treatment of desulfurized slag - Google Patents

Abstract

PURPOSE:To recover useful base metals and to recover desulfurized slag and blast furnace slag by adding the blast furnace slag to a slag pan wherein modifying materials such as red mud, caking coal and the like are added to the desulfurized slag by regulating the rate of addition of the other with respect to the laid quantity either one thereof and blowing O2. CONSTITUTION:After 10-20wt% desulfurized slag 1 based on the weight of molten steel making slag 3 to be described later is laid in a slag pan 2, the slag 3 is charged therein and the pan is put into a slag treating chamber 4. The hardened surface slag in this state is cracked with an iron weight 6, and while the molten slag is bubbled by loading a lance pipe 7 fed with O2 into the molten slag, the motor-driven vibrator of a hopper 8 is operated to charge a mixture (modifying material) of red mud, caking coal, etc. as m.p. decreasing materials and the like through a conveyor 9 and a chute 10. Further the molten slag is post-blown by O2 alone. Here, the rate of addition of said modifying agent to the slag 3 is set at 4-5wt%. In the case of layer 4-5wt% the modifying material, the desulfurized slag is added at 10-20wt%, whereby the recovery of useful base metals is made easy.

Description

[Detailed description of the invention] The present invention recovers useful ingots (hereinafter referred to as metals) by melting and reacting desulfurized slag that has disintegrability or elutes seedlings, molten aluminum slag, and an appropriate amount of modifier. The present invention also relates to a method for modifying both slags.

Generally, steelmaking slag is r and β-2CaO-3iO2,
Mainly FIICAO (played lime), Gehlenite (2C
aQ-AI, O, ll5IO,), Akel V Night (
2CaO-1110・25102), magnetite (h
, oii), ^matite (Fa, O,), usurite Ire), etc.

There is also a case that contains a special sI sea bream slag periclase (0-), autoclave treatment, 200°
C%201E/a', held for 3 hours, 'Q2i~1d
! With a particle size of 111, if less than 1 in 10 is considered to be a disintegration rate, it will disintegrate by approximately 3011%. .

Blood removal slag is broadly classified into carbide a-sulfur slag and soda desulfurization slag. Carbide desulfurization slag is made by blowing lime and carbide into it along with inert gas in a 1 meter length, and removing it before putting it into the steelmaking furnace.

This slag is composed of unstable copper and solid oxides (for example, Cn5) combined with calcium, and is cold.
@ Elephant water WDI + 1 When exposed to water, the yellow content is 19
P-Qd) Yaf -2mu←
510 It has the property of expanding and collapsing to combine x,
If fine metals or Kische graphite alloys 1 and unreacted carbides are present in the FA, acetylene may be generated.

Soda desulfurization slag was in the state of WIa, m
i-Remove before placing in oven. This slag has a very high concentration (r/J8~28 ffi%), Nil, S
6 to combine unstable N1tII oxide,
1btlJtnF? 3 When water is in demand, the sulfur content is eluted and 1r-ions are released, resulting in a high N12 value.
Because it lives in rb and o, it absorbs heat easily and is blind to collapse, and Q
Contains small metals and Quiche graphite.

In other words, the slag of the 4L type collapses and releases backwater, so there are few uses for it, and some are used as cement Ix materials, but most of it is discarded. , pollution control sites are becoming more and more difficult to dispose of.Therefore, Motohara has investigated the causes of expansion and collapse of these slags, FIIIcao, and 12caO-1aoz, with a stable mineral composition, that is, 3ω and 212caO-1aoz.岨03*! 1G
,,2ωMIgO-2sio2% 2CaO@Fe2
G3.4cao @ u, o, a &, 03 etc. Kil7 SV, which is a slag that does not expand or collapse even without quenching.

In addition, by reacting with unstable sulfur compounds (for example, Kasa S, etc.) and infecting S, NS, Homachi, etc., which have a low tolerance to water, it is possible to prevent backwater WaaS. In addition, to reduce the viscosity and solidification temperature of the slag (by applying heat to the W), it is possible to make a window with Kische graphite that has been combined with the desulfurization slag, or to make a pan on which the metal contained in the slag is placed. It coagulates and settles at the bottom to form large metal particles. Furthermore, a lance-shaped material was charged into the 9 slags of the filter hook to prevent the mobile ions contained in the desulfurization slag from releasing C, and while bubbling gas was being fed, slate, shale, and masa soil were removed. , Karami, W.J.'
By introducing a modification material consisting of waste sand, etc. for more than one day, and desulfurization slag, and allowing the static melting reaction to occur sufficiently, the metal recovery will be 68%, and the slag will be modified and can be used as roadbed material or bone. It can be used as a material.

Note that the following methods of adding the above-mentioned modifier added for the purpose of lowering viscosity, lowering solidification temperature, etc. can be considered.

Insert the IOH into the 0-making furnace from the beginning or halfway.

■Input into the reactor of country n.

■Put it in contact with the slag flow discharged from the c21 furnace.

The molten slag flow discharged from the ΦrAJ furnace is placed back to the falling position.

Use as a substitute for slag in a pot.

・Pour it into a slow can so that it forms a sandwich with the slag.

■ A lance-shaped OE is charged to the molten slag in the Noru feedstock, and bubbling gas is blown into the slag while bubbling is performed.

-000- method, insert a lance-shaped object, blow bubbling gas, and perform bubbling.

Here, while the slag melts into an l-shaped m1lk: Hatake 0.
, ju203 % RE, 03 and -20, etc. are added to the unused resources and Maro Yasui to make effective use of the sensible heat of the sea bream slag. Although AI and O alone are sufficient, there is a disadvantage that reactions occur due to the high degree of solubility.

Next, an experiment conducted to confirm the effects of the present application and its results will be described.

The experimental samples shown in Table 1 below were used.

10 of these samples were heated to 110″C triIa＠off
Dry for more than 24 hours! 61% i feed - desulfurization slag and slate q addition & 9 quality is only a! send,
Furthermore, the material was crushed to a size of Q*5m or less, and the DIB temperature was measured. Further, using the same sample, the combined viscosity was measured at each temperature using a crucible rotation type viscosity measuring machine (measuring machine capable of measuring up to 100 voices).

In addition, N tailings with a concentration of %8wn or less were placed in a sIl magnesia crucible and held in a siliknit electric furnace held at 11580'C for 2s minutes to melt.
Bubble by blowing Alt or 02 gas,
Add a viscosity reducing and solidifying temperature reducing agent, 1. Add desulfurization slag, perform bubbling, turn off the cooling switch, 1.
The temperature was lowered to 200° C. in about 25 minutes, and the mixture was taken out of the furnace and cooled in the air.

Bottom, lance-shaped Ce after adding assimilation temperature reducing material and deborizing slag
While charging and bubbling with Air or 02 gas, fiM (1 to 2
1 metal) was added to investigate the R degree, recovery rate, etc. of the recovered metal.

Table G52 shows the measurement results of NG4 temperature, and Table 3 shows the measurement results of viscosity.

As mentioned above in Table 2, only 3~
When 10% by weight is added, the melt temperature and viscosity decrease rapidly. In other words, the solidification temperature of copper slag and desulfurization slag is as high as approximately 1,500℃ (already higher than that of high-temperature crystalline minerals).
110・8i0. Hiro is generated.

However, slate 1 shale, masa soil, cast Takasago, Kara 1%
Adding more than one slag of desulfurization slag, blast furnace slag, etc.
It hardly solidifies even at 350°C, and both the solidification temperature and viscosity have been improved so that it is almost the same as blast furnace slag.

Table 4 in Section 4 shows the minerals produced in the trial slag.

As shown above, steelmaking slag and desulfurization slag (6) contain 2C・0・Si2. even if they are simply remelted, and when rapidly cooled, β
-2CaOeSIO, which is mainly glass, but when slowly cooled, it contains 1-2CaO•Isio and has disintegrability.

However, 15% by weight of desulfurization slag and 4 to 5% by weight of -II1 or higher of slate, shale, masa, etc. are added to the remelted steelmaking slag.
When added and subjected to bubbling treatment, 2CIO・F-01
4CaO*MuIJDs・F%On, 2CaO*At@O
s*SiO! The slag consists mainly of

The abbreviations of the minerals produced in Table 4 are shown below.

β-2CsO・・β-2CsO-S! 0tC1F-
zcaoeF*, O.

・C4AF-4CaOeA40. @Fe1o1G@
= 2CaOsA40. -8i0゜H・・−,Fs0
s AK = 2CaO-MgO-28i% Next, Table 5 shows the elution test results.

Looking at the above results, it can be seen that if only the desulfurization slag is remelted, B" and 80j- ions will also be eluted, and the elution of yellow water cannot be prevented. The amount of electricity added is 4 to 5 weight S and the desulfurization slag is about 15 weight
Once added to cause a melting reaction, almost no SO and t-ions will be eluted, making it possible to prevent the elution of backwater.

Table 6 shows the particle size and proportion of the recovered meta-kei.

The granular pig iron (1 to 2 m) used in the basic experiment of percent iron was recovered from desulfurization slag after crushing and magnetic separation, and had a melting yield of 72 times IN.
iron grains were used.

As a result of the above, by adding granular pig iron to the slag of steelmaking slag,
However, the molten metal does not coagulate and does not form large metal grains, and even if desulfurization slag (2) and granular pig iron are added, the molten metal does not coagulate much due to the slag being highly viscous.

However, when desulfurization slag ■ and desulfurization slag (mu, B), slate 1 shale, masa soil, karami, etc., and granular pig iron are added, *S aggregates and becomes large metal grains.

Table 7 shows the aggregate test results for the trial slag.

remarks Next, an embodiment of the present application processing method will be described.

〔Example〕

As shown in the drawing, the desulfurization slag (1) is received in the ladle (2) (approximately 1200 kp), and after approximately 30 minutes (still quite hot), the copper slag (3) is received (after receiving the slag, approximately 1200 kp) is received. 20 minutes, about 750
%), slag processing chamber (4) (Three sides are welded with iron plates to prevent dust from scattering, and the other side is closed with a door that has a small space at the bottom to introduce cooling air when a pot is placed on it. ) and suspended by an overhead crane (5) and an iron weight (6) (with a sharp tip and weighing 2OOOKF).
Break the surface hardening ring in 4 places and charge it to the slag while sending oxygen to the lance vibe () (oxygen pressure, [17-1okid,
Accumulated acid amount: 2 m'/win) l, , t < While performing the buffing, the electric pie break of the hopper (8) is moved, and the melting point reducing materials such as slate, foundry sand, etc. are transferred from the sheet to the baby conveyor (9). A mixture of slag, blast furnace slag, etc. was introduced at a pressure of about 370 kf for about 4 minutes, and after-blowing was performed for about 3 minutes using only oxygen.

The dust generated during bubbling was collected by the dust collector shaft.

This slag was transported to a discharge field, crushed, treated with AIA, and subjected to an elution test and a roadbed material test, which are shown in Table 8.

The dust generated during bubbling is collected by the dust collector 0, and if it becomes large, it is granulated or recycled and returned to the hopper (8), used alone as a substitute for slag 1), or mixed. It is safe to use.

The results of the elution test for this example are shown in Table 8, the results of the roadbed material test are shown in Table 9, and the percentage of residual metal in the tailings after crushing and magnetic separation is shown in Table 10.

[Brief explanation of drawings]

The drawings are explanatory diagrams showing an example of the method of the present application. Patent applicant: Japan Magnetic Separation Co., Ltd.

Claims (1)

[Claims] 1 to 20% by weight of desulfurization slag or 4 to 5% by weight of red mud, slate, shale, waste sand, 1 mass ± 1 part or more of blast furnace slag is poured into the casting, and the slag is melted. a! ! After the sea bream slag is slaged, air, Wi-slip or oxygen is blown in with a lance-like object, and the subcommittee that laid down the desulfurization slag is red mud, slate, shale, #waste sand, masa soil, and part or more of blast furnace slag. 4 to 5% by weight, or vice versa, 10% aW slag
A method for improving slag while making it easier to recover useful metal by adding ~20'IR amount%.