JPH06240313A - Method for cooling and crushing treatment of slag - Google Patents

Abstract

PURPOSE:To provide a method for separating metal in molten slag containing molten metal and solid metal as a cooling and crushing treatment for steelmaking slag and this pre-treatment. CONSTITUTION:In the case of discharging the molten slag 3 into two sets of slag receiving vessels 4a, 4b from a discharging slag ladle 2 incorporating the molten slag 3 containing the molten metal, the molten slag and the molten metal are discharged into one set of slag receiving vessel. In this case, by sp.gr. separation, the slag and the metal can be separated. Successively, after discharging the solidified slag and metal into the other slag receiving vessel, the molten slag and the molten metal are solidified in the discharging slag ladle and thereafter, discharged to separate the slag and the metal, and the pressurized cooling treatment method for further cooling, solidifying and crushing the slag is applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling crushing treatment for steelmaking slag and a pretreatment thereof for separating metal and solid metal in molten slag containing molten metal.

[0002]

2. Description of the Related Art Conventionally, as a cooling process of steelmaking slag, molten slag containing molten metal discharged from the steelmaking process is first discharged from a slag pan containing the molten slag into a dump or a pan for cooling and solidification. After that, it is transported to the slag processing plant and crushed. In the process, the slag and the ingot were separated by pyrene work, etc., and the separated ingot was melted to an appropriate size and recycled to the steelmaking process, and the slag was classified and used for roadbed materials and landfill. .

In the above-mentioned slag treatment method, the working environment is becoming more severe due to the deterioration of the environment caused by the dust and the high temperature and high heat work in the cooling process. In addition, the treatment process is complicated and the burden of treatment cost tends to increase, and recently, treatment of the treatment plant has become difficult. Therefore, improvement of the slag processing method is attempted, and development of a short-time processing technique capable of coping with the generation of a large amount of slag is underway.

[0004] As an example thereof, there is a technique for promoting the stabilization of slag, which is a novel process (SQ process) in which high temperature slag developed by the present inventors is supplied to a tank and cooled by using a high pressure steam atmosphere. Is a typical method. According to this process, conventional aging for 1 to 3 years is 3
The same level is reached by processing in units of 0 minutes. However, in order to further promote the slag crushing in this process and efficiently separate the metal, a pretreatment method for the slag was necessary. That is, in this process, the less the amount of metal contained in the supplied slag, the more the processing in the subsequent steps can be simplified. Therefore, as a slag cooling crushing treatment method including this process and its pretreatment method,
It was desired to develop a technique for separating metal from slag.

[0005]

In order to solve the above-mentioned problems, the present invention discharges a liquid of solid and liquid into one container at the stage of receiving molten slag containing molten metal,
The purpose is to efficiently separate the metal by pouring the solid into the other slag container. That is, in the conventional method, after the metal is separated from the metal in the crushing process after being cooled and solidified, the metal is recovered as much as possible in the high temperature state.
Furthermore, although a great amount of labor was required for separating and fusing the metal in the slag container, a cooling crushing method for slag and a pretreatment which can easily omit it are provided.

[0006]

Means for Solving the Problems The present invention is to solve the above-mentioned problems, and the gist thereof is to discharge molten slag from a slag pan containing molten slag containing molten metal into two slag containers. In that case, the molten slag and molten metal are discharged into one of the slag containers, the solidified slag and the metal are discharged into the other slag container, and the molten slag and molten metal are then placed in the slag pan. After solidifying, discharging and separating the slag and metal, the slag is
Further, the method is a cooling and crushing treatment method of slag, which is characterized in that a pressure cooling treatment method of cooling, solidifying and crushing is performed.

That is, according to the present invention, the slag generated in the steelmaking process is received by the slag pan and is discharged into the slag container in the molten state. In this method, the metal ingot is left in the slag pan, only the liquid is poured into one slag container, and then the solid metal remaining in the slag pan is discharged into the other slag container. The present invention focuses on the difference in specific gravity between molten slag and ingot, and relates to a method for efficiently separating specific gravity between slag and ingot. In general, when discharging slag, molten slag / metal is discharged first, and then solidified slag / metal is discharged.
In the past, since it was carried out continuously in one pot, the solidified material dropped on the slag / metal that was separated by specific gravity in
The impact again solidifies while the slag and the metal are still mixed. Therefore, it was impossible to separate the slag and the ingot only after crushing. In order to prevent the mixing of slag and ingot by the present invention, the above problem is solved by completely separating and, and it is possible to efficiently separate slag and ingot.
Among the ingots separated by the method of the present invention, in order to more efficiently separate the ingots in the slag container, the bottom of the slag container is provided with a weir for dividing the ingot. With this weir, the metal that sinks to the bottom of the slag container and begins to solidify is divided by this weir and fragmented and solidified into smaller groups.

The slag in the slag container is solidified only in the molten state in the slag pan and discharged. Then, the slag and the metal are completely removed by the impact of a simple separating device (for example, a pressing jig or a heavy machine). Can be separated. The collected slag is S
After being charged into the tank of the Q process and cooled and crushed by high-pressure steam, it is then supplied to the magnetic separation and, if necessary, the polishing process, and the metal is further improved in quality and recovered and recycled. The separation of the metal according to the present invention promotes the slag crushing / aging effect by the SQ process, the recovery of the metal after the SQ process is made more efficient, and the time required for the process is shortened.・ It can be expected that the processes such as crushing and separating the metal (pyrene) will be omitted. The present invention will be described in more detail below with reference to the drawings of the examples.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1, 2 and 3 are views showing an embodiment of the present invention. In FIG. 1, of the slag containers 4a and 4b, liquid slag and metal are discharged to the slag container 4a in this embodiment, and solid slag and metal are discharged to the slag container 4b. In FIG. 1, the slag in the steelmaking process is received by the slag pan 2, and is hung by the crane 1 and discharged into the slag containers 4a and 4b. The slag in the steel making process of the present invention is mainly a converter slag, a dephosphorization desulfurization slag, and an ingot slag (ladle slag). It is difficult to apply the present invention to other steelmaking slags due to the metal content and the temperature.

In the slag pan 2, the slag pan 2 is kept suspended from the crane 1 until the solid / liquid slag 3 is completely injected. The surface of the steelmaking slag 3 in the slag pan 2 may be covered with a heat insulating material or the like in order to prevent the slag from solidifying. Next, when the molten slag 3 is almost discharged, the crane 1 moves to start discharging the solidified slag / metal mixture 8a, 8b into the slag container 4b, as shown in FIG. Many of the solidified substances at this stage are indefinite lumps, and if the interface is welded to the refractory, increase the load such as the vibration of the slag pan or the angle of the slag pan when discharging. It is necessary to take measures such as. In this solidified state, solid slag and solid metal are mixed, which is enriched with metal, which improves the efficiency of metal separation.

The slag injected into the slag container 4a shown in FIG. 2 is separated into a completely molten slag 6 and a metal 7 by specific gravity. If a single or plural weirs 5 for dividing the metal are provided at the bottom of the slag container 7, the metal melting step required for recycling can be simplified and the efficiency is further improved.
By this weir 5 for dividing the metal, the metal deposited on the bottom of the slag container 4a is divided and solidified by the weir. That is, inside the slag container 4a, the molten slag 6 and the bottom metal 7 are separated by specific gravity. Figure 3
[Fig. 3] is a plan view (a) and an AA cross-sectional view (b) of the weir 5 for separating metal, which is attached to the bottom portion 10 of the slag container 4a.
In the present embodiment, the number of weirs is three, but the number of weirs and the height of the weirs may be set so that the volume of each weir corresponds to the required size of the metal. The heights of the weirs are preferably the same, and the volume of the space formed by the weirs is preferably the same between the weirs. In addition, an inclined surface is formed from the top surface portion 11 of the weir to the bottom portion 10 of the slag container so that the deposited metal can be easily discharged.

[0012] If necessary, when the metal is deposited in the space formed by the weir, the metal that has been integrated and cut off can be easily recycled after being discharged without performing any fusing treatment. As is clear from the above examples, according to the present invention, the slag generated in the steelmaking process is solid.
In the liquid state, first, the liquid slag / metal is discharged into one of the two slag containers, and the slag and the deposited metal are separated by specific gravity in this container. After that, the solid slag / metal is continuously discharged into the other slag container to efficiently separate the solid metal. Therefore, by the pretreatment of the present invention, the molten slag having a low metal content is supplied to the SQ process of the next step, and the cooling and crushing treatment is efficiently performed.

[0013]

As described above, the slag according to the present invention can be adjusted to have a low metal content, which improves the working environment in the cooling and crushing process and simplifies the slag process. It is possible to improve the efficiency of gold recycling.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing discharge of a molten material into one of the slag containers according to an embodiment of the present invention.

FIG. 2 is a schematic view showing discharge of solid matter to the other slag container according to the embodiment of the present invention.

FIG. 3 is a (a) plan view (b) AA cross-sectional view of the weir for dividing the deposited metal provided in the container receiving container of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Crane 2 ... Dust pan 3 ... Solid / liquid slag 4a, 4b ... Retainer container 5 ... Dividing weir 6 ... Liquid slag 7 ... Metal 8a, 8b ... Slag / metal mixture 9 ... Retainer container inner part 10 ... Bottom of slag container

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinji Matsuo 1 Nishinosu, Oita-shi, Oita Pref., Nippon Steel Co., Ltd. Oita Works (72) Inventor, Kashiwabara 1 Nishinosu, Oita, Oita Pref. Oita Steel Works, Ltd. (72) Inventor Toshiaki Kudo No. 1 Nishinosu, Oita, Oita-shi, Oita Pref. Nippon Steel Co., Ltd. Oita Works, Oita, Japan (72) Tetsuo Imi, No. 1, Nishinosu, Oita-shi, Oita Pref. (72) Inventor Junhiro Hori 1st Nishinosu, Oita-shi, Oita New Nippon Steel Co., Ltd. Oita Steel Co., Ltd.

Claims (1)

[Claims] 1. When discharging molten slag from a slag pan containing molten slag containing molten metal into two slag containers, the molten slag and molten metal are discharged into one of the slag containers,
Next, after discharging the solidified slag and metal in the other slag container, after solidifying the molten slag and molten metal in the slag pan,
A cooling and crushing treatment method of slag, characterized in that the slag is discharged to separate the slag and the metal, and the slag is subjected to a pressure cooling treatment method of further cooling, solidifying and crushing.