JPH06256812A - Treating for cooling and crushing slag and pretreating device therefor - Google Patents

Abstract

PURPOSE:To separate metal in molten slag containing molten metal and solid metal as cooling and crushing treatment for steelmaking slag and the pretreating device therefor. CONSTITUTION:In the case of discharging from a slag off ladle 2 accomodating the molten slag containing the molten metal, the molten slag and metal are discharged through a skimmer 6 arranged in the slag off ladle 2 and the solidified metal dammed up with this skimmer 6 is made to be separatable. Successively, the liquid slag discharged into a slag receiving ladle is separated with a sp. gr. separation. After solidifying the molten slag and the molten metal in the slag receiving ladle, the slag and metal are discharged into a tilting type slag pan or on a field and the pressurized cooling treatment for cooling and crushing the slag is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for separating ingots and solid ingots in molten slag containing molten ingots as a cooling crushing treatment for steelmaking slag and its pretreatment.

[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
With 0 minute processing, the same level is reached after 6 to 9 months of aging. However, a pretreatment method of slag was necessary to further efficiently separate the metal in this process. That is, in this process, the less the amount of metal contained in the supplied slag, the more efficiently the hydration reaction can be accelerated and the slag crushed, and the subsequent steps can be omitted. Therefore, as a slag cooling and crushing treatment method including this process and a pretreatment method for the slag cooling and crushing treatment method, it has been desired to develop a technique for separating metal ingot from slag.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a method for separating molten slag containing molten metal into a solid / liquid slag and a metal in a stage of receiving slag. By distributing molten slag, solidified slag, and metal into the discharge port of a slag pan, the purpose is to separate the metal efficiently by specific gravity separation. That is, in the conventional method, the metal that has been separated in the process of crushing after being cooled and solidified is recovered in the high temperature molten state as much as possible. Further, the molten slag and the molten metal can be separated by specific gravity, but the falling impact of the solidified slag and the solidified metal that are discharged at the same time causes the molten slag and the molten metal once separated by specific gravity to be mixed again, and finally It was impossible to completely separate the slag and the metal. Further, although a great amount of labor was required for separating and fusing the metal in the slag container, a method for cooling and crushing slag and a pretreatment device capable of omitting the labor are provided.

[0006]

The present invention solves the above-mentioned problems by preventing remixing of molten slag and ingot due to falling of solidified matter, and its gist is to provide molten slag containing molten ingot. At the time of discharging from the slag pan to be stored into the slag container, the molten metal and the molten slag are diverted by the weir provided at the discharge port of the slag pan, so that the molten metal is first received from the slag pan. The molten slag into the slag container, and finally the solidified slag and solidified metal are left in the slag pan, and the first discharged slag and molten metal in the slag container are received. Cooling and crushing treatment method of slag, characterized in that it is solidified in a slag container and then discharged to a tilt-type slag pan or a soil field, and after the slag and the metal are separated, the slag is cooled and crushed, followed by pressure cooling treatment. , And molten steel containing molten metal The vicinity of a discharge port Haikasunabe housing the grayed, the Sukinma as weir bottom is dipping in a molten slag layer on a pre-processing apparatus of slag, characterized in that allowed to divert solid liquid slag and bullion.

That is, according to the present invention, when the slag generated in the steelmaking process is received by the slag pan and is discharged into the slag container in the molten state, both phases of the solid liquid slag are diverted to separate each phase of the solid liquid. It is a method in which only the molten slag and the molten metal are poured into a slag container after being separated into. That is, by having a depth near the discharge port of the slag pan, soaking the solidified slag in the molten slag layer and blocking the solidified slag by this weir so as not to inject it into the slag container, Isolate and separate while remaining in the pan.

According to the present invention, the metal can be removed efficiently in advance, and the treatment in the slag cooling and crushing step which is the next step becomes more advantageous. 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 molten slag in the slag container is solidified in the slag container and then discharged on the slag pan or in the soil in the next step to be primary crushed and the slag and the metal are separated at the same time. Be implemented. The separated high-temperature slag is charged into the tank of the SQ process, cooled and crushed by high-pressure steam, and then supplied to the magnetic separation and, if necessary, to the grinding process, and the metal is further recovered and recycled. Will be. The separation of the metal according to the present invention improves the crushing and cooling efficiency of the slag in the SQ process, more efficiently recovers the metal after the SQ process, and shortens the time required for the process.
In order to further improve the level of separation, it is possible to efficiently recover the metal by the multistage treatment of the intermediate container of the present invention, and it can be expected that the process can be omitted. The present invention will be described in more detail below with reference to the drawings of the examples.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1, 2 and 3 are views showing an embodiment of the present invention. FIG. 1 shows a slag pan 2 of the present invention provided with a skinmer 6 as a weir. This skinmer 6 is a refractory weir, and is preferably provided so that solids are dammed near the discharge port, that is, surrounding the discharge port, and only the molten slag can flow out at the bottom. The discharge port and skinma should be of a size suitable for the molten slag discharge rate. As shown in FIGS. 2 and 3, a dividing weir 5 is provided at the bottom of the slag container 4 for separating the inflowing metal into a specific gravity. In FIG. 2, the slag in the steelmaking process is received by the slag pan 2, and is hung by the crane 1 and poured into the slag container 4. The slag in the steel making process of the present invention is mainly a converter slag, a dephosphorization desulfurization slag, a ladle slag (agglomerate slag), and other steel making slags are completely reheated in order to carry out the present invention. It is conceivable to apply the method of the present invention after making it into a different molten state.

In the slag pan 2, the solidified matter is blocked by the skinma 6, and only the liquid slag 3 is discharged to the slag container 4. The slag pan 2 continues to discharge the entire amount while being suspended from the crane 1. 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. As shown in FIG. 2, the skinma 6 does not approach the horizontal state due to the inclination of the slag pan 3, so it is preferable to determine the installation angle of the skinma in advance so as not to be horizontal.

At the bottom of the slag container 4, a weir 5 for separating metal is provided.
Is provided singularly or plurally. The molten slag / molten metal released by the weir 5 for dividing the metal is separated by specific gravity, and the metal deposited on the bottom of the slag container 4 is divided and solidified by the weir. That is, inside the slag container 4, the specific gravity is separated into the molten slag 7 and the bottom metal 8. FIG. 3 is a plan view (a) and A- of the weir 5 for dividing the metal attached to the bottom portion 10 of the slag container 4.
It is an A sectional view (b). 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 height of the weir is preferably the same, and the volume of the space formed by the weir is also 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.

If necessary, when the metal is deposited in the space formed by the weir, when the solidified slag / metal in the slag container is separated in the next step, the metal that has been subjected to the sedimentation integration is cut off. After being discharged, the gold will be directly recycled to the converter process without being subjected to any cutting treatment. As is clear from the above examples, according to the present invention, when the slag generated in the steelmaking process is in a solid / liquid state, first, the skinma 6 is provided in the slag pan to block the solidified product so that only the liquid slag is retained. The metal in the slag is completely removed by discharging and using the specific gravity separation in the slag container. Therefore, the pretreatment device of the present invention supplies the molten slag with a low metal content to the SQ process of the next step, and the cooling and crushing treatment is efficiently performed.

[0014]

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 view showing a skinma provided in a slag pan according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a discharge situation by the slag pan of the present invention.

FIG. 3 is (a) a plan view (b) a sectional view taken along line AA of the weir for dividing the deposited metal provided in the slag container of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Crane 2 ... Dust pan 3 ... Liquid slag 4 ... Retainer container 5 ... Dividing weir 6 ... Weir (skinma) 7 ... Liquid slug 8 ... Metal 9 ... Retainer container inner surface 10 ... Retainer container bottom 11 … Weir top surface

Claims (2)

[Claims] 1. When the molten slag containing molten slag is discharged from the slag pan containing the molten slag into the slag container, the weir provided at the outlet of the slag pan splits the molten metal and the molten slag. First, the molten metal is discharged from the slag pan to the slag container, then the molten slag is discharged to the slag container, and finally the solidified slag and the solidified metal are left in the slag pan, and further discharged first. Pressurized cooling process in which the molten slag and molten metal in the slag container are solidified in the slag container and then discharged to a tilting slag pan or the soil, and the slag is cooled and crushed after separating the slag and the metal. A method for cooling and crushing slag, which comprises: 2. A skinma is provided in the vicinity of the discharge port of the slag pan containing the molten slag containing the molten metal as a weir whose lower part is immersed in the molten slag layer to separate the solid liquid slag and the metal. Characteristic slag pretreatment device.