JP6644625B2 - Apparatus and method for crushing magnetic separation of slag solidified in steelmaking furnace - Google Patents

Description

The present invention, Fe is contained as iron oxide steelmaking slag (i.e. _{FeO, Fe 2 O 3, Fe} 3 O 4)
Prior to conducting the instrumental analysis of the amount, in order to obtain a sample for instrumental analysis, after solidifying the steelmaking furnace slag, the iron content in the slag is separated by magnetic force while crushing the solidified material (hereinafter, magnetic separation). ) And a crushing magnetic separation method. Here, the steelmaking furnace means a furnace for producing molten steel irrespective of a raw material or a method, and is specifically a general term of a converter, an electric furnace, and the like.

  In the operation of steelmaking furnaces (eg, converters, electric furnaces, etc.), slag generated in the furnace (hereinafter referred to as steelmaking furnace slag) contains Fe as iron oxide, and in order to maintain stable operation, the slag is used. It is known that the total amount of Fe (so-called total Fe) is an effective index. In other words, by maintaining and managing the total Fe in the slag in an appropriate range, a rational operation with less iron loss can be performed.

  The appropriate range of the total Fe differs depending on the specifications of the steelmaking furnace and the type of steel to be manufactured, but in order to operate with the total Fe maintained within the predetermined range, the steelmaking furnace slag must be removed from the steelmaking furnace during operation. It is necessary to collect the components, analyze the components in a short time, and reflect the measurement results in the operation. If an analysis technique using various devices (so-called device analysis) is adopted, it is possible to reduce the time required for measuring the total Fe.

  However, in order to obtain a sample to be subjected to instrumental analysis, it is necessary to cool and solidify the collected steelmaking furnace slag and further to crush the coagulated product into granules. In addition, iron (Fe) that is not iron oxide from molten steel is mixed into the steelmaking furnace slag, and is cooled in the process of obtaining the sample to be dispersed in the coagulated material as particulate iron (hereinafter referred to as granular iron). are doing. In order to improve the measurement accuracy of the total Fe, it is necessary to provide a sample from which granular iron has been removed for instrumental analysis.

In other words, in order to increase the measurement accuracy of total Fe by instrumental analysis, after cooling and solidifying the steelmaking furnace slag, it is necessary to crush the coagulated material into granules and then subject the sample from which the granular iron has been removed to instrumental analysis. There is. Therefore, it takes time to collect and solidify the steelmaking furnace slag, crush the coagulated material and remove the granular iron, and obtain a sample for instrumental analysis. There is a problem of difficulty. Moreover, since the removal of the granular iron is performed manually by an operator, not only the efficiency of the removal operation is poor, but also the amount of the granular iron remaining in the sample for the instrumental analysis may fluctuate due to individual differences.
Therefore, a technique for efficiently removing granular iron and stably obtaining a sample for instrumental analysis in a short time has been studied.

  For example, Patent Document 1 discloses that a coagulated product of a blast furnace slag and a converter slag is crushed by a crusher, dropped on a drum, and the iron particles are adsorbed on the drum surface by a magnet built in the drum. A technique for sorting iron is disclosed. According to this technique, it is possible to sort iron particles by a magnet (hereinafter, referred to as magnetic separation) while crushing the coagulated material, so that the time required to obtain a sample for instrumental analysis can be reduced. In addition, problems caused by individual differences among workers can be solved.

  However, since the technology described in Patent Document 1 uses a crusher, it is inevitable that a device that performs magnetic separation while crushing solidified slag (hereinafter referred to as a crushed magnetic separation device) becomes large-scale. However, it is difficult to install it in a factory such as a converter or an electric furnace or in an operation room. For this reason, the collected slag has to be transported from the factory to a crushing magnetic separation apparatus outside the site, which causes a problem that the time required to obtain a sample for instrumental analysis becomes long.

  Further, among various types of instrumental analysis, in the X-ray fluorescence analysis suitable for the measurement of total Fe, the measurement accuracy is improved as the sample is finer. However, the technology described in Patent Literature 1 uses a crusher, so that it is possible to roughly crush the solidified slag, but it is difficult to finely crush it. Therefore, when the total Fe is measured by X-ray fluorescence analysis using the technique described in Patent Document 1, there is a problem that good measurement accuracy cannot be obtained. Therefore, it is difficult to collect a small amount of slag from a steelmaking furnace and quickly perform high-precision analysis on the spot.

JP 2003-10724 A

  The present invention solves the problems of the conventional technology, and can simultaneously perform crushing of steelmaking furnace slag and magnetic separation of granular iron (that is, sorting of granular iron) by simple means in a short time. It is an object of the present invention to provide a crushing magnetic separation apparatus and a crushing magnetic separation method capable of reducing the size of a solidified material of a steelmaking furnace slag by magnetic separation and reliably separating granular iron by magnetic separation.

  The present inventors have focused on X-ray fluorescence analysis as an instrumental analysis suitable for measuring total Fe. Since the fluorescent X-ray analysis can be performed in the steelmaking furnace factory, the sample to be used for the measurement in the steelmaking furnace factory should be used in order to promptly reflect the total Fe measurement result in the operation of the steelmaking furnace. The technology to obtain is discussed. Then, if a small amount of slag (about 50 g) is collected from the steelmaking furnace, it is possible to finely crush the coagulated material of the steelmaking furnace slag by rotating the rotating blade at a high speed, and as a result, subject it to fluorescent X-ray analysis. It has been found that the refinement of the sample can be achieved, which contributes to the improvement of the measurement accuracy of total Fe. In addition, by finely crushing the solidified material of the steelmaking furnace slag, it becomes easy to separate the granular iron from the solidified material.

Further, in order to prevent the crushed solidified material from scattering around, if a rotating blade is rotated inside a container for storing the solidified material (hereinafter, referred to as a storage container), the inside of a steelmaking furnace factory (for example, operation) It was found that it was possible to crush the solidified material of the steelmaking furnace slag in the room. Then, the fine-grained solidified material and kinetic iron to which kinetic energy has been added by the rotating blades scatter in the storage container. Therefore, by arranging the magnet, only the granular iron can be magnetized.
In this manner, crushing and magnetic separation are simultaneously performed in the steelmaking furnace factory, and the fine solidified material obtained by separating the granular iron can be suitably used as a sample for X-ray fluorescence analysis.

The present invention has been made based on such findings.
That is, the present invention provides a storage container capable of detachably attaching a lid and storing a solidified product of a steelmaking furnace slag, a container disposed inside a bottom portion of the storage container to crush the solidified product, and to store the solidified product in a wall of the storage container A crushing magnetic separation apparatus for a steelmaking furnace slag coagulate having a rotating blade for scattering to a part and a magnet disposed outside the wall to magnetize the iron particles in the coagulate inside the wall.

  In the crushing magnetic separation apparatus of the present invention, it is preferable that the wall is inclined so that the diameter of the storage container increases upward. Further, it is preferable to have a rocking means for rocking the storage container while crushing the coagulated material by the rotating blade.

  In addition, the present invention stores the coagulated material of the steelmaking furnace slag in a storage container, attaches a detachable lid to the storage container, and then crushes the coagulated material by rotating a rotating blade disposed inside the bottom of the storage container. In addition, the method is a method of crushing and magnetizing a steelmaking furnace slag coagulated material in which iron is scattered to a wall portion of a storage container and magnetic iron in the coagulated material is magnetized inside the wall portion by a magnet disposed outside the wall portion.

  In the crushing magnetic separation method of the present invention, the wall is inclined so that the diameter of the storage container expands upward, and the grain iron is once raised along the wall by the kinetic energy applied from the rotating blade, and then the grain iron is separated. Is preferably lowered along the wall by the gravity applied to the wall. Further, it is preferable to swing the storage container while crushing the coagulated material by the rotating blade.

  According to the present invention, the crushing of the steelmaking furnace slag and the magnetic separation of the granular iron can be simultaneously performed in a short time by simple means, and the granulation of the solidified product of the steelmaking furnace slag by the crushing, and the magnetic separation can be performed. Reliable sorting of granular iron becomes possible. And, since the measurement accuracy of the total Fe by the fluorescent X-ray analysis is improved, an industrially remarkable effect is achieved.

It is a top view showing typically the example of the crushing magnetic separation device concerning the present invention. It is a side view which shows the side surface of the crushing magnetic separation apparatus shown in FIG. It is a side view which shows another example of the side surface of the crushing magnetic separation apparatus shown in FIG.

  FIG. 1 is a plan view schematically showing an example of a crushing magnetic separation apparatus according to the present invention. When crushing the solidified material of the steelmaking furnace slag, the solidified material is stored in the storage container 1 and a lid is attached. In FIG. 1, the lid is not shown to show the inside of the storage container 1. FIG. 2 shows a side view of FIG.

  A rotating blade 2 is provided inside the bottom of the storage container 1, and the rotation blade 2 is rotated at a high speed with the lid attached to the storage container 1. As the rotating blade 2 rotates, the solidified material of the steelmaking furnace slag and the rotating blade 2 repeatedly and violently collide with each other, so that the solidified material is finely crushed. Then, the granular iron dispersed in the coagulated material of the steelmaking furnace slag is separated from the coagulated material, and the coagulated material of fine grains (hereinafter referred to as pulverized slag) and a single piece of granular iron are mixed. In this process, the crushed slag and the granular iron are scattered to the wall of the storage container 1 by the kinetic energy applied from the rotating blade 2, but since the opening is closed by attaching the lid, the storage container 1 Spattering to the outside can be prevented.

The magnet 3 is disposed outside the wall of the storage container 1, and among the crushed slag and the granular iron scattered by the rotating blade 2, only the granular iron is magnetically attached to the inside of the wall by the magnetic force of the magnet 3. I do. Therefore, the material of the storage container 1 is preferably a material such as a metal that easily transmits magnetic force. Specifically, the storage container 1 made of stainless steel is preferable from the viewpoint of achieving both durability and price. Further, in order to uniformly apply the magnetic force of the magnet 3 to the granular iron scattered in the storage container 1, the horizontal cross-sectional shape of the storage container 1 is preferably circular (see FIG. 1).
On the other hand, even if the crushed slag collides with the wall of the storage container 1, it does not magnetically adhere, slides down along the wall, and is stored at the bottom.

In this way, it is possible to simultaneously carry out the crushing of the steelmaking furnace slag and the magnetic separation of the granular iron in a short time by simple means. Moreover, it is possible to make the crushed slag finer by crushing and to reliably sort the iron particles by magnetic separation.
If the rotation of the rotating blade 2 is stopped, the lid is further removed, and the pulverized slag is collected from the bottom of the storage container 1, it can be suitably used as a sample for X-ray fluorescence analysis.
The means for collecting the crushed slag from the storage container 1 is not particularly limited. For example, it can be collected by appropriately devising, for example, picking it up manually or scooping it up using a spoon-shaped jig.

  Further, since the crushed slag is not magnetically attached, it can be collected by tilting the storage container 1 and allowing the crushed slag to flow down to another container along the wall. However, in that case, there is a possibility that the magnetically-bonded granular iron may be separated and mixed by friction with the pulverized slag. Therefore, as shown in FIG. 3, a portion where the magnet 3 is not provided is provided on the wall portion of the storage container 1, and the storage container 1 is inclined with the portion directed downward, thereby preventing the mixing of granular iron. . That is, since the granular iron is not magnetically attached to the portion where the magnet 3 is not provided, if the pulverized slag flows down to another container using this as a flow path, it is possible to prevent the granular iron from being mixed into the pulverized slag. .

As the type of the magnet 3 to be used, either a permanent magnet or an electromagnet can be used. However, the electromagnet requires ancillary equipment (for example, power supply, wiring, etc.). Therefore, a permanent magnet is preferred from the viewpoint of simultaneously performing crushing and magnetic separation by simple means.
The shape of the magnet 3 is not particularly limited. When arranging the magnets 3 on the wall of the storage container 1, it is sufficient to use one having a shape (for example, a circle, a square, a regular hexagon, or the like) capable of reducing a gap between adjacent magnets.

  As described above, the storage container 1 preferably has a circular horizontal cross-sectional shape. In addition, it is preferable to incline the wall (see FIGS. 2 and 3) so that the diameter increases upward. By inclining the wall portion in this manner, the effect of promoting magnetic adhesion of the granular iron is further exhibited. That is, the granular iron that has collided with the wall of the storage container 1 by the kinetic energy applied from the rotating blade 2 once rises along the inclined wall, and then descends along the wall by gravity. As a result, the time during which the magnetic force of the magnet 3 acts on the granular iron can be extended, so that the granular iron can be reliably magnetically bonded.

Further, by oscillating the storage container 1 during the crushing of the solidified material of the steelmaking furnace slag, the solidified material retained on the lower side of the rotary blade 2 (that is, between the rotary blade 2 and the bottom of the storage container 1). Can be moved to the upper side of the rotary blade 2, and as a result, the solidified matter in the storage container 1 can be uniformly crushed.
The means for swinging the storage container 1 is not particularly limited. For example, it is preferable to use means such as reciprocating the storage container 1 in the horizontal direction or reciprocating in the arc direction.

  In performing the crushing of the steelmaking furnace slag and the magnetic separation of the granular iron simultaneously by applying the present invention, the suitable setting conditions such as the rotation speed (times / second) of the rotary blade 2 and the processing time (second) are stored. Since it changes according to the diameter of the container 1, the inclination angle of the wall of the storage container 1, the size of the rotary blade 2, and the like, it is preferable to perform a test of crushing magnetic separation in advance to obtain suitable setting conditions.

  In this manner, the steelmaking furnace slag is collected from the operating steelmaking furnace, the steelmaking furnace slag is cooled and solidified, and then crushing and magnetic separation are performed simultaneously in the same factory (for example, in an operation room), thereby shortening the time. To prepare a sample, which can be subjected to X-ray fluorescence analysis. X-ray fluorescence analysis can also be performed in a steelmaking furnace factory, so that the total Fe measurement result can be immediately reflected in adjustment of operating conditions of the steelmaking furnace.

  Using the crushing magnetic separation apparatus according to the present invention shown in FIG. 1, crushing and magnetic separation of the coagulated material of the electric furnace slag as a steelmaking furnace slag are performed simultaneously to separate the crushed slag and the granular iron, and the obtained crushed slag is The sample was subjected to X-ray fluorescence analysis to measure total Fe. The procedure will be described.

  A coarse lump of coagulated material of the steelmaking furnace slag is stored in the storage container 1, a lid is attached, the rotating blade 2 is rotated at a high speed, and while the coagulated material is finely crushed, the coagulated material is scattered to the wall to remove the iron particles. Was magnetically attached to the magnet 3. As the magnet 3, a circular ferrite magnet (manufactured by TRUSCO, diameter 25 mm, thickness 4 mm) is used, and a total of 20 ferrite magnets are attached to the wall with an adhesive tape. In addition, a portion (see FIG. 3) where the magnet 3 was not provided was provided on the wall portion of the storage container 1 to provide a flow path for collecting fine solidified matter after the completion of the crushing magnetic separation.

  In this way, while rotating the rotary blade 2 for 80 seconds, the storage container 1 was appropriately rocked (reciprocating movement of ± 30 ° in the arc direction). After the rotation blade 2 was stopped, the lid was removed, and the storage container 1 was tilted so that the portion where the magnet 3 was not provided was directed downward, so that the pulverized slag was flowed down to another container and collected. The collected pulverized slag (0.3 mm or less in particle size) was subjected to X-ray fluorescence analysis to measure total Fe. This is an invention example.

On the other hand, conventionally, a coarse lump of the coagulated material of the steelmaking furnace slag is stored in a storage container in which no magnet is provided, and after attaching a lid, the rotating blade is rotated at high speed to finely coagulate the coagulated material. Had been crushed. The time required for the crushing was 80 seconds as in the invention example. After the crushing was completed, the lid was removed, and a worker manually inserted a magnet into the storage container to magnetically attach the iron particles to the magnets, thereby separating the crushed slag and the iron particles. The ground slag remaining in the storage container was subjected to X-ray fluorescence analysis to measure the total Fe. This is a conventional example.
X-ray fluorescence analysis was performed 12 times each according to the procedure of the invention example and the conventional example, and total Fe was measured. Table 1 shows the results.

As is clear from Table 1, the maximum value, the minimum value, and the average value of the measured values are all lower in the invention example than in the conventional example. This means that in the invention example, the granular iron was sufficiently selected.
Also, the difference between the maximum value and the minimum value and the standard deviation are smaller in the invention example. This means that the measurement accuracy of total Fe was improved because no granular iron remained in the pulverized slag used in the invention example.

  Further, in the conventional example, the crushing and the magnetic separation are performed as separate steps, whereas in the example of the present invention, the crushing and the magnetic separation are performed at the same time. In the example of the present invention, the time required for preparing a sample to be subjected to the fluorescent X-ray analysis can be greatly reduced. . In other words, although the time required for the magnetic separation process in the conventional example varies depending on the individual differences of workers, the magnetic separation process in the conventional example can be omitted in the invention example.

DESCRIPTION OF SYMBOLS 1 Storage container 2 Rotating blade 3 Magnet

Claims (6)

  A storage container to which a lid can be detachably attached and which stores the solidified product of the steelmaking furnace slag; and a wall portion of the storage container which is disposed inside a bottom portion of the storage container to crush the solidified product and to disperse the solidified product. A rotating blade that scatters to the wall portion, and a magnet that is disposed outside the wall portion and magnetizes the iron particles in the solidified portion to the inside of the wall portion. Crushing magnetic separator.   The apparatus according to claim 1, wherein the wall is inclined so that the diameter of the storage container increases upward.   The crushing magnetic separation apparatus for slag coagulated steelmaking furnace according to claim 1 or 2, further comprising a rocking means for rocking the storage container while crushing the coagulated material by the rotating blade.   After storing the coagulated material of the steelmaking furnace slag in the storage container and attaching a detachable lid to the storage container, rotating the rotary blade disposed inside the bottom of the storage container to crush the coagulated product Crushing the steelmaking furnace slag coagulated material, wherein the steel iron slag is dispersed on the wall of the storage container, and the iron particles in the coagulated material are magnetically attached to the inside of the wall by a magnet disposed outside the wall. Magnetic separation method.   The wall portion is inclined so that the diameter of the storage container expands upward, and the granular iron is once raised along the wall portion by the kinetic energy applied from the rotating blade, and then gravity applied to the granular iron The method for crushing and magnetizing a steelmaking furnace slag solidified product according to claim 4, wherein the steelmaking furnace slag is lowered along the wall.   The method according to claim 4 or 5, wherein the storage container is rocked while the solidified material is crushed by the rotating blade.

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