JP2018122226A - Selection method of used refractory, and selector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for selecting valuables highly accurately from used refractory.SOLUTION: Used refractory is crushed (crushing step), and the used refractory crushed in the crushing step is adjusted into a prescribed size range (size adjustment step), and the size-adjusted used refractory is subjected to component analysis, and based on the obtained result, refractory particles are separated into a plurality of groups as each group having the same main component (component separation step).SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to a method and apparatus for sorting used refractories, and more particularly, to a sorting method and apparatus for sorting and recovering valuable materials from used blast furnace refractories generated in steelworks.

  Various refractories are used in the steel process, especially in the ironmaking process and steelmaking process. Moreover, not only one type of refractory is used alone, but also multiple types of refractories are combined according to the characteristics, etc. It is widely used.

  For example, FIG. 1 is a cross-sectional view showing a use state of a general blast furnace. As shown in this figure, a refractory 3 is attached to the inner side of an iron shell 2 that is an outer shell of the blast furnace shell 1. This refractory 3 is mainly composed of an upper and lower two-layer structure of a metal line material 4 and a slag line material 5. The metal line material 4 is mainly in contact with hot metal, and the slag line material 5 is mainly in contact with slag. Allocated. Since the used refractory (hereinafter referred to as “used refractory”) is generally dismantled using heavy machinery, the metal line material 4 and the slag line material 5 are mixed and discharged.

The metal line material 4 includes alumina (Al ₂ O ₃ ) as a main component, and the slag line material 5 includes silica (SiC) as a main component. Since both of these are highly valuable as raw materials, it is industrially advantageous if the metal line material 4 and the slag line material 5 are individually recovered from the used refractory and can be reused as recycled materials.

  Therefore, various methods for selecting used refractories have been proposed. For example, Patent Literature 1 and Patent Literature 2 describe a method in which used refractories are crushed and the particle size is adjusted, and sorting by magnetic force is repeated a plurality of times, and further, sorting by color is combined. Patent Document 3 describes a method in which refractories are artificially colored in advance and are sorted according to their colors after use. In addition, Patent Document 4 describes a method of selecting a used refractory by utilizing a specific gravity difference by using a solid-gas fluidized bed using powder as a fluid medium.

Japanese Patent Laid-Open No. 2003-83683 Japanese Patent Laid-Open No. 2003-088845 JP 2013-212481 A JP 2016-77956 A

Here, the metal line material 4 and the slag line material 5 both contain some iron, but the amount thereof is small and the difference between the amounts is small. It is difficult. Moreover, since the metal line material 4 and the slag line material 5 are both contained in carbon, the selection by color described in Patent Document 3 is gray or black, and there is a portion where the colored portion is not exposed after crushing. Therefore, it was not suitable for selecting this kind of refractory. Moreover, the selection using the specific gravity difference described in Patent Document 4 is unsuitable for selecting a refractory having a particle size of about 10 mm or less.
Therefore, in the above method, the accuracy of selecting valuable materials from the used refractories is still not sufficient.

  Therefore, an object of the present invention is to provide a method and apparatus for sorting valuable materials from used refractories with high accuracy.

  The inventors have intensively studied the means for solving the above problems, and as shown in Table 1 below, there is a clear difference in the component composition between the metal line material 4 and the slag line material 5, and therefore, It was found that the selection based on the contained component itself and the component ratio is effective. Furthermore, it has also been found that in the component analysis of used refractories, it is necessary to adjust the particle size appropriately according to the analysis method.

Moreover, as shown in Table 1, the slag line material 5 contains Al ₂ O ₃ and SiC, and it is preferable to further select and collect these for reuse as valuable materials. Then, as a result of earnestly examining the method of selecting the slag line material 5 into the Al ₂ O ₃ refractory and the SiC refractory, the slag line material 5 is further pulverized and the obtained powder is selected by magnetic force. Found that it was effective. That is, the powder mainly composed of Al ₂ O ₃ contains a small amount of Fe, whereas the powder mainly composed of SiC does not contain any Fe. Then, when the slag line material 5 was pulverized, it was conceived that a mixed powder of Al ₂ O ₃ -based powder and SiC-based powder was obtained, and a trace amount of Fe could be detected by a predetermined magnetic force.
The present invention is based on the above findings.

The gist of the present invention is as follows.
(1) A method for selecting a used refractory, a crushing step of crushing the used refractory, a particle size adjusting step of adjusting the used refractory crushed by the crushing step to a predetermined particle size range, Component separation for separating the refractory particles into a plurality of groups having the same main component based on the result obtained by performing component analysis on the used refractory particles having the particle size adjusted. And a process for sorting used refractories.

(2) The used refractory is a used blast furnace refractory, and the plurality of groups include a group of metal line materials mainly composed of Al ₂ O ₃ and a slag line material mainly composed of SiC. The method for sorting used refractories according to (1) above, comprising a group.

(3) A method for selecting used refractories, a crushing step for crushing the used refractory, a particle size adjusting step for adjusting the used refractory crushed by the crushing step to a predetermined particle size range, Component separation for separating the refractory particles into a plurality of groups having the same main component based on the result obtained by performing component analysis on the used refractory particles having the particle size adjusted. A pulverizing step of pulverizing the refractory particles belonging to at least one of the plurality of groups into a refractory powder; and the refractory powder using a magnetic force and a non-magnetic powder. A method for sorting used refractories, comprising: a magnetic sorting step for sorting into a body.

(4) The used refractory is a used blast furnace refractory, and the plurality of groups include a group of metal line materials mainly composed of Al ₂ O ₃ and a slag line material mainly composed of SiC. And the pulverizing step pulverizes the refractory particles belonging to the slag line material group into slag line material powder, and the magnetic force sorting step uses the magnetic force to slag the slag line material powder. The method for sorting used refractories as described in (3) above, wherein the powder is sorted into Al ₂ O ₃ powder and SiC powder.

(5) The used refractory is a used blast furnace refractory, and the plurality of groups include a group of metal line materials mainly composed of Al ₂ O ₃ and a slag line material mainly composed of SiC. And the pulverizing step pulverizes the refractory particles belonging to the metal line material group into metal line material powder, and the magnetic force selection step uses the magnetic force to pulverize the metal line material powder. The method for sorting used refractories as described in (3) or (4) above, wherein the powder is sorted into Al ₂ O ₃ powder and SiC powder.

(6) The component separation step includes separating the refractory particles including bare iron from the refractory particles using magnetic force before or after the component analysis. The method for sorting used refractories as described in any of the above.

(7) The component analysis is a method for selecting a used refractory according to the above (1) to (6), which uses laser-induced breakdown spectroscopy.

(8) The method for sorting used refractories according to (3) to (7) above, wherein the magnetic force sorting step uses a magnet having a magnetic flux density of 0.6 T or more.

(9) A used refractory sorting apparatus, a crushing means for crushing the used refractory, a particle size adjusting means for adjusting the used refractory crushed by the crushing means to a predetermined particle size range, Component separation for separating the refractory particles into a plurality of groups having the same main component based on the result obtained by performing component analysis on the used refractory particles having the particle size adjusted. Means for sorting used refractories.

(10) The crushing means crushes used blast furnace refractories, and the component separation means comprises the refractory grains, a group of metal line materials mainly composed of Al ₂ O ₃ and SiC. The used refractory sorting apparatus according to the above (9), which is separated into a plurality of groups including a group of slag line materials as a main component.

(11) A used refractory sorting apparatus, a crushing means for crushing the used refractory, a particle size adjusting means for adjusting the used refractory crushed by the crushing means to a predetermined particle size range, Component separation for separating the refractory particles into a plurality of groups having the same main component based on the result obtained by performing component analysis on the used refractory particles having the particle size adjusted. Means, pulverizing means for pulverizing refractory particles belonging to at least one of the plurality of groups into refractory powder, and the refractory powder using magnetic force and non-magnetic powder. A sorting apparatus for used refractories, comprising magnetic sorting means for sorting into a body.

(12) The crushing means crushes used blast furnace refractories, and the component separation means comprises the refractory grains, a group of metal line materials mainly composed of Al ₂ O ₃ and SiC. The slag line material group is separated into a plurality of groups including the slag line material group, and the pulverizing means pulverizes the refractory particles belonging to the slag line material group into slag line material powder. And the magnetic force sorting means sorts the slag line material powder into Al ₂ O ₃ based powder and SiC based powder using magnetic force. Sorting device.

(13) The component separation means according to any one of (9) to (12), wherein the refractory particles including ingot iron can be further separated from the refractory particles using magnetic force. Used refractory sorting equipment.

(14) The used refractory sorting apparatus according to (9) to (13), wherein the component separation unit includes a laser-induced breakdown spectrometer.

(15) The used refractory sorting apparatus according to (9) to (14), wherein the magnetic force sorting unit includes a magnet having a magnetic flux density of 0.6 T or more.

  According to the present invention, valuable materials can be selected from used refractories with high accuracy.

It is sectional drawing which shows the use condition of a common blast furnace. It is a flowchart of the sorting method of a used refractory according to one embodiment of the present invention. Ingredients that separate refractory particles into multiple groups as the same main component based on the results of component analysis by laser-induced breakdown spectroscopy on used refractory particles It is a conceptual diagram which shows the structure of a separation means. It is a figure which shows the example of the emission spectrum of the metal line material refractory grain detected by the spectrometer. It is a figure which shows the example of the emission spectrum of the slag line material refractory grain detected by the spectrometer. It is a figure which shows the example of the emission spectrum of the impurity refractory grain detected by the spectrometer.

(Method for sorting used refractories)
Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a flowchart of a method for sorting used refractories according to an embodiment of the present invention.

As shown in FIG. 2, the method for sorting used refractories according to the present invention crushes used refractories (crushing step), and adjusts the used refractories crushed by the crushing step to a predetermined particle size range. (Particle size adjusting step) Based on the results obtained by conducting component analysis on the particle size-adjusted used refractory particles, the refractory particles are grouped into a plurality of groups as the same main component. It is a method of separating (component separation step).
Hereinafter, each step will be described in detail.

  First, in a crushing process, a used refractory is crushed. This crushing can be performed using, for example, a heavy machine such as a jaw crusher or a bucket crusher. This crushing step is intended to make the used refractory into a particle size suitable for component separation described later.

  Next, in the particle size adjustment step, the used refractory crushed by the crushing step is adjusted to a predetermined particle size range. When the laser induced breakdown spectroscopy described later is used, the particle size range is from 5 mm to 100 mm, and more preferably from 10 mm to 40 mm. In order to improve the accuracy of subsequent component separation, it is preferable that the width of the particle size distribution is narrow.

  Specifically, the particle size of the used refractory can be adjusted using a sieve. For example, when the particle size range of the used refractory is 10 mm or more and 40 mm or less, first, the crushed used refractory is sieved using a sieve having an opening size of 40 mm. Thereafter, the used refractory material that has passed through a sieve having an opening size of 40 mm is passed through a sieve having an opening size of 10 mm. The used refractory material remaining on the sieve having a mesh size of 10 mm is handled as used refractory particles 30 (hereinafter also referred to as refractory particles 30) having a predetermined particle size range.

  In addition, it is preferable to use for the above-mentioned particle size adjustment again after carrying out the crushing process again for the used refractory material which remain | survived on the sieve in the sieve of opening size 40mm first, and making a particle size still smaller.

Subsequently, in the component separation step, the used refractory particles 30 whose particle size has been adjusted are separated into a plurality of groups as groups having the same main component based on the result obtained by performing component analysis. . When the used refractory grains 30 are used blast furnace refractory grains, the refractory grains 30a belonging to the group of metal line materials (hereinafter referred to as the metal line material refractory grains 30a), slag as the group having the same main component It isolate | separates into the some group containing the refractory grain 30b (henceforth slag line material refractory grain 30b) which belongs to the group of a line material. As described above, there is a clear difference in the component composition between the metal line material and the slag line material, and therefore selection based on the contained component itself and the component ratio can be performed. Furthermore, the refractory of the blast furnace slag typically has slag adhering in the process of use, and impurity-containing refractory grains 30c (hereinafter referred to as impurity refractory grains 30c) such as blast furnace slag are also contained. Can be selected based on the components themselves and the component ratios.
Hereinafter, selection of used blast furnace refractory grains will be described as a typical example.

  Component analysis methods include laser-induced breakdown spectroscopy, fluorescent X-rays, and transmitted X-rays. The refractory particles 30 are divided into metal line material refractory particles 30a and slag line material refractory particles 30b. As long as the component analysis can be reliably performed on a plurality of groups including, there is no particular limitation. Among them, it is preferable to use laser induced breakdown spectroscopy. This is because laser-induced breakdown spectroscopy does not require sample preparation, and can usually perform very high-speed measurements of several microseconds to several milliseconds per spot, and has high working efficiency. Furthermore, the laser induced breakdown spectroscopy has a wide element measurement range including light elements such as H, Be, Li, C, N, O, Na and Mg. It is suitable for the analysis of the composition of slag and slag line materials.

  FIG. 3 shows that the refractory particles are divided into a plurality of groups having the same main component based on the results obtained by performing component analysis by laser-induced breakdown spectroscopy on the used refractory particles. It is a conceptual diagram which shows the structure of the component separation means to isolate | separate. Hereinafter, referring to FIG. 3, based on the results obtained by performing component analysis by laser-induced breakdown spectroscopy using component separation means on the used refractory particles 30, the refractory particles 30 are used. The component separation step of separating the components into a plurality of groups as groups having the same main component will be described.

  The component separating means 6 shown in FIG. 3 includes a vibration feeder 7, a belt conveyor 8, an image camera 9, a short pulse laser 10, a spectrometer 11, an analysis controller 12, an air jet 13, and a drop chute 14a. To 14c.

  In this component separation means 6, the used refractory particles 30 adjusted to a predetermined particle size range are supplied uniformly without being stacked on the belt conveyor 8 by the vibration feeder 7. The used refractory particles 30 supplied onto the belt conveyor 8 are detected by the image camera 9 at the transport position on the belt conveyor 8. Based on the transport position information by the image camera 9 and information on the amount of movement of the belt conveyor 8 tracked from rotation pulse sensor information such as an encoder attached to a drive motor (not shown) of the belt conveyor 8, The short pulse laser 10 is accurately irradiated toward each of the used refractory particles 30 being conveyed, the emission spectrum of the high-temperature plasma generated from the irradiation point is detected by the spectrometer 11, and the analysis controller is based on the detection information. 12 is used to determine whether the refractory grain 30 corresponds to one of the metal line material refractory grain 30a, the slag line material refractory grain 30b, or the impurity refractory grain 30c.

4-6 is a figure which shows the example of the emission spectrum of the metal line material refractory grain, the slag line material refractory grain, and the impurity refractory grain detected by the spectrometer. Here, when the component composition of the metal line material and the slag line material is compared with reference to Table 1, the metal line material includes Al ₂ O ₃ as a main component, and the slag line material includes SiC as a main component. . Further, the metal line material contains MgO, but the slag line material does not contain MgO. Therefore, by comparing the result of the component composition obtained by the analysis of the emission spectrum and the above-described knowledge (Table 1), the refractory particles 30 are the metal line material refractory particles 30a or the slag line material refractory particles 30b. It is possible to determine whether any of them is true. For example, in the example of the emission spectrum of the metal line material refractory particles shown in FIG. 4, since Al has a peak and the spectrum of Mg can be confirmed, Al ₂ O ₃ is contained as a main component and MgO is contained. Determination that it is the metal line material refractory grain 30a is obtained. On the other hand, in the example of the emission spectrum of the slag line material refractory particles shown in FIG. 5, since the spectrum of Mg does not exist, it can be determined that the slag line material refractory particles 30b are mainly composed of SiC. Furthermore, in the example of the emission spectrum of the impurity refractory particles shown in FIG. 6, since there is a peak in Ca, it can be determined that the impurity refractory particles 30c such as blast furnace slag are present.

The used refractory particles 30 determined by the analysis controller 12 as one of the metal line material refractory particles 30a, the slag line material refractory particles 30b, or the impurity refractory particles 30c are dropped using the air jet 13. It is separated by controlling the position to the chutes 14a to 14c. The metal line material refractory particles 30a are separated into the drop chute 14a, the slag line material refractory particles 30b are separated into the drop chute 14b, and the impurity refractory particles 30c are separated into the drop chute 14c. Although the air jet 13 is used in the illustrated example, the position to the drop chutes 14a to 14c can be controlled using a paddle.
Thus, based on the result obtained by performing component analysis with respect to the used refractory particles 30 whose particle size has been adjusted, the refractory particles 30 are converted into metal line material refractory particles 30a and slag line material refractory. It can be separated into either the grain 30b or the impurity refractory grain 30c.

In the component separation step in the present invention, it is preferable to separate the refractory particles including bare iron from the refractory particles 30 using magnetic force before or after the above component analysis. In general, the refractory material of the blast furnace is designed so that the adhesion of slag and hot metal is reduced, but in the process of use, the slag containing bare metal adheres. In the reuse of refractory, refractory grains with slag containing such slag iron are separated from refractory grains using magnetic force of slag contained in slag. It is preferable. For example, a magnetic separator having a magnetic field with a magnetic flux density of 0.1T to 1T may be used. A suitable magnetic flux density is 0.3T to 0.6T. As this magnetic separator, a drum type or a belt suspension type can be used. Preferably, by using a drum type magnetic separation means, it is possible to more effectively prevent slag from being dropped.
In this way, by separating the refractory particles including bare metal from the refractory particles using magnetic force, the possibility that slag is mixed into valuable materials can be reduced.

  Through the above steps, used blast furnace refractories can be reliably sorted into metal line material and slag line material. In the present invention, the refractory particles thus sorted can be further classified into subdivided depending on the presence or absence of magnetism.

Subsequently, in the present embodiment, the refractory particles 30 belonging to at least one of the plurality of groups are pulverized into refractory powder (pulverization step). More specifically, among the refractory particles 30 separated into the metal line material refractory particles 30a and the slag line material refractory particles 30b by the above-described component separation step, the refractory belonging to the slag line material refractory particles 30b. The particles are further pulverized into refractory powder (hereinafter referred to as slag line material powder). As described above, since the slag line material contains Al ₂ O ₃ and SiC, when the slag line material refractory particles 30b are further finely pulverized into a powder, the main component is Al ₂ O _3. A mixed powder of Al ₂ O ₃ -based powder and SiC-based powder containing SiC as a main component can be obtained.

  The pulverization can be performed using, for example, a hammer mill, an impact crusher, or a roller mill.

The powder after pulverization of the slag line material refractory particles 30b should be in a particle size range that can be separated into Al ₂ O ₃ -based powder and SiC-based powder. The particle size is preferably 2 mm or less, more preferably 1 mm or less. On the other hand, when the particle size is reduced to less than 100 μm, the handling property as a powder is deteriorated, and therefore, it is preferably 100 μm or more.

The refractory powder thus pulverized is sorted into magnetic powder and non-magnetic powder using magnetic force (magnetic force sorting step). Here, since Al ₂ O ₃ is derived from natural ore, it contains a trace amount of Fe, whereas SiC does not exist in nature and is manufactured artificially, so it does not contain any Fe. Have Thus, in order to sense a small amount of Fe contained in Al ₂ O ₃ , it is necessary to select a magnetic force using a sufficient magnetic force. As a result of investigations by the inventors, it is preferable to use a magnetic force sorting unit having a magnetic field with a magnetic flux density of 0.6 T or more, and more preferably, a magnetic force sorting unit having a magnetic field with a magnetic flux density of 1 T or more.

  As this magnetic force sorting means, for example, a magnetic force sorting means designed so that a large number of poles having 1T or more may be locally arranged by devising a magnetic circuit. The form of the magnetic force sorting means can be a drum type, a belt type, a belt hanging type, a high gradient magnetic force sorting means using a magnetized medium, or the like.

Using the above magnetic force sorting means, a slag line material powder can be selected from a magnetic Al ₂ O ₃ powder containing a small amount of Fe and a non-magnetic SiC powder containing no Fe. it can. Thus, SiC can be recovered with higher purity by separating the components and then selecting the magnetic force.

In addition, you may apply the above pulverization process and magnetic force selection process with respect to the refractory grain which belongs to the group of metal line materials. Of the refractory particles 30 separated into the metal line material group and the slag line material group by the above component separation step, the refractory particles belonging to the metal line material refractory particles 30a are further pulverized into refractory powder ( Hereinafter, metal line material powder). The metal line material contains Al ₂ O ₃ and SiC, and when the metal line material refractory grains 30a are pulverized, Al ₂ O ₃ based powder containing Al ₂ O ₃ as main components and SiC as main components Metal line material powder that is a mixed powder with SiC-based powder is obtained, and Al ₂ O ₃ can be recovered with higher purity by performing the same magnetic separation as slag line material powder. it can.

  In this way, valuable materials can be selected from the used refractories with high accuracy.

(Used refractory sorting device)
Next, an apparatus for sorting valuable materials from used refractories according to the present invention will be described. A used refractory sorting device (hereinafter referred to as a refractory sorting device) according to the present invention includes a crushing means for crushing a used refractory, and a used refractory crushed by the crushing means within a predetermined particle size range. Based on the result obtained by conducting component analysis on the particle size adjusting means for adjusting the particle size to the used refractory particles, the refractory particles are divided into a plurality of groups having the same main component. And component separation means.

  In the used refractory sorting apparatus of the present invention, the means used for crushing the used refractory is not particularly limited, and any refractory to be treated can be arbitrarily selected as long as it can be crushed to an appropriate size. Things can be used. For example, a heavy machine such as a jaw crusher or a bucket crusher can be used.

  When the particle size range is suitable for a component separation means having a laser-induced breakdown spectrometer described later, the particle size is 5 mm to 100 mm, and more preferably 10 mm to 40 mm. In order to increase the accuracy of subsequent component separation, it is preferable that the particle size distribution is relatively narrow.

  The means used for adjusting the particle size of the used refractory is not particularly limited, and any one can be used as long as it can be adjusted to used refractory particles within a predetermined particle size range. Examples of the particle size adjusting means that can be used include a sieve. For example, when the particle size range of the used refractory is set to a particle size of 10 mm or more and 40 mm or less, first, a sieve having an opening size of 40 mm is applied. Thereafter, the used refractory material that has passed through a sieve having an opening size of 40 mm is passed through a sieve having an opening size of 10 mm. The used refractory material remaining on the sieve having a mesh size of 10 mm is treated as used refractory particles 30 having a predetermined particle size range.

  Further, a component separation unit that separates the refractory particles 30 whose particle size has been adjusted into a plurality of groups as a group having the same main component based on a result obtained by performing a component analysis will be described. . The component separation means is not particularly limited, and any component separation means can be used. When the used refractory grains 30 are used blast furnace refractory grains, the refractory grains 30a belonging to the group of metal line materials (hereinafter referred to as the metal line material refractory grains 30a), slag as the group having the same main component It isolate | separates into the some group containing the refractory grain 30b (henceforth slag line material refractory grain 30b) which belongs to the group of a line material. As described above, there is a clear difference in the component composition between the metal line material and the slag line material, and therefore selection based on the contained component itself and the component ratio can be performed. Furthermore, the refractory of the blast furnace slag typically has slag adhering in the process of use, and impurity-containing refractory grains 30c (hereinafter referred to as impurity refractory grains 30c) such as blast furnace slag are also contained. Can be selected based on the components themselves and the component ratios.

As the component separation means of this embodiment, for example, the component separation means 6 shown in FIG. 3 can be used. The component separation unit 6 is a component separation unit that separates the refractory particles into a plurality of groups as groups having the same main component based on the result obtained by performing component analysis by laser-induced breakdown spectroscopy. Yes, as shown in FIG. 3, the vibration feeder 7, the belt conveyor 8, the image camera 9, the short pulse laser 10, the spectrometer 11, the analysis controller 12, the air jet 13, and the drop chute 14a- 14c.
Based on the result obtained by performing component analysis on the used refractory particles 30 whose particle size has been adjusted using the component separating means 6, the refractory particles 30 are converted into metal line material refractory particles 30 a and slag. It can be separated into either line material refractory grains 30b or impurity refractory grains 30c.

Furthermore, the component separating means preferably includes a magnetic separator in order to separate the refractory particles including bare iron from the refractory particles using magnetic force. More specifically, in the reuse of the refractory, the refractory grains of slag containing such bullion iron from the refractory grains 30 are magnetized by utilizing the magnetism of the bullion iron contained in the slag. It is preferable to separate using For example, a magnetic separator having a magnetic field with a magnetic flux density of 0.1T to 1T may be used. A suitable magnetic flux density is 0.3T to 0.6T. As this magnetic separator, a drum type or a belt suspension type can be used. Preferably, by using a drum type magnetic separation means, it is possible to more effectively prevent slag from being dropped.
In this way, by separating the refractory particles including bare metal from the refractory particles using magnetic force, the possibility that slag is mixed into valuable materials can be reduced.

  The refractory sorting apparatus of the present invention further includes pulverizing means for pulverizing refractory particles belonging to at least one of the plurality of groups into refractory powder. More specifically, the refractory particles of either one or both of the metal line material refractory particles 30a and the slag line material refractory particles 30b are further pulverized into a refractory powder by the above-described component separation means, for example, , Hammer mill, impact crusher or roller mill.

  The refractory sorting apparatus of the present invention further includes magnetic force sorting means for sorting the refractory powder into magnetic powder and non-magnetic powder using magnetic force. As the magnetic force sorting means, it is preferable to use magnetic force sorting means having a magnetic field with a magnetic flux density of 0.6 T or more, and more preferably, magnetic force sorting means having a magnetic field with a magnetic flux density of 1 T or more.

  As the above-mentioned magnetic force sorting means, for example, a magnetic force sorting means designed so as to arrange a large number of poles that are 1T or more locally by devising a magnetic circuit may be used. The form of the magnetic force sorting means can be a drum type, a belt type, a belt hanging type, a high gradient magnetic force sorting means using a magnetized medium, or the like.

Using the above magnetic force sorting means, Al ₂ O ₃ can be recovered with higher purity from the metal line material refractory particles 30a (metal line material powder) crushed into refractory powder, and the refractory powder SiC can be recovered with a higher purity from the slag line material refractory particles 30b (slag line material powder) crushed into slag.

  In this way, valuable materials can be selected from the used refractories with high accuracy.

  Hereinafter, the present invention will be specifically described according to examples. However, the present invention is not limited by the following examples, and can be appropriately changed within a range that can be adapted to the gist of the present invention, all of which are included in the technical scope of the present invention. .

[Example 1]
According to the flowchart shown in FIG. 2, used blast furnace refractories were selected.
That is, first, used refractories including a metal line material and a slag line material were crushed with a jaw crusher. Next, the crushed used refractory is passed through a sieve having an opening size of 40 mm, and the used refractory passed through the sieve is collected, passed through a sieve having an opening size of 5 mm, and the used refractory remaining on the sieve is removed. By collecting, used refractory particles adjusted to a particle size of 5 mm to 40 mm were obtained.

  Thereafter, the used refractory particles whose particle size was adjusted to 5 mm or more and 40 mm or less were applied to the component separation means. The used refractory particles were uniformly supplied by the vibration feeder without being stacked on the belt conveyor, and the transport position of the used refractory supplied on the belt conveyor on the belt conveyor was detected by an image camera. Based on the transport position information by this image camera and the information on the amount of movement of the belt conveyor tracked from the rotation pulse sensor information such as the encoder attached to the drive motor of the belt conveyor, the used refractory particles being transported A short pulse laser is accurately irradiated toward each of the above, and the emission spectrum of the high-temperature plasma generated from the irradiation point is detected by a spectrometer, and the refractory particles are formed into metal line materials using an analysis controller based on the detected information. It judged whether it corresponded to a refractory grain, a slag line material refractory grain, or an impurity refractory grain.

4-6 is a figure which shows the emission spectrum of the metal line material refractory grain, the slag line material refractory grain, and the impurity refractory grain detected by the spectrometer. In the emission spectrum of the refractory particles shown in FIG. 4, since Al has a peak and the spectrum of Mg can be confirmed, it is a metal line material containing Al ₂ O ₃ as a main component and containing MgO. Judgment is obtained. On the other hand, in the example of the emission spectrum of the refractory particles shown in FIG. 5, since there is no Mg spectrum, it can be determined that the slag line material is composed mainly of SiC. Furthermore, in the emission spectrum shown in FIG. 6, since Ca has a peak, it can be determined that the refractory contains impurities such as blast furnace slag.

  The refractory particles belonging to the metal line material group and the slag line material group determined by the analysis controller were separated by controlling the position of the drop chute using an air jet. As a result, both the metal line material and the slag line material had a purity of 90% by mass or more.

In addition, the said purity is calculated by the following formula | equation in each fall chute | shoot which collect | recovered metal line material and slag line material.
(Formula 1)
Purity (% by mass) of metal line material = mass of metal line material / (mass of metal line material + mass of slag line material + mass of impurities such as blast furnace slag)
(Formula 2)
Purity of slag line material (% by mass) = Mass of slag line material / (Mass of metal line material + Mass of slag line material + Mass of impurities such as blast furnace slag)

[Example 2]
In Example 1, the refractory particles belonging to the group of slag line materials separated using the component separation means were pulverized to a particle size of 2 mm or less with a hammer mill, and the obtained slag line material powder was obtained as follows. The magnetic Al ₂ O ₃ -based powder and the non-magnetic SiC-based powder were sorted by a magnetic force sorting means having a 1T rare earth permanent magnet. The purity of the Al ₂ O ₃ powder and the SiC powder obtained by this magnetic separation was 25% by mass for the Al ₂ O ₃ powder and 92% by mass for the SiC powder, respectively. It was. In this way, valuable materials could be recovered by selecting the metal line material and the slag line material and further selecting the Al ₂ O ₃ powder and the SiC powder.

[Example 3]
In Example 1, the refractory particles belonging to the group of metal line materials separated using the component separating means were pulverized to a particle size of 2 mm or less with a hammer mill, and the obtained metal line material powders were The magnetic Al ₂ O ₃ -based powder and the non-magnetic SiC-based powder were sorted by a magnetic force sorting means having a 1T rare earth permanent magnet. The purity of the Al ₂ O ₃ powder and the SiC powder obtained by this magnetic sorting was 95% by mass for the Al ₂ O ₃ powder and 90% by mass for the SiC powder, respectively. It was. In this way, valuable materials were recovered by selecting the metal line material and the slag line material and further selecting the Al ₂ O ₃ powder and the SiC powder.

1 Blast Furnace 2 Iron Skin 3 Refractory 4 Metal Line Material 5 Slag Line Material 6 Component Separation Means 7 Vibration Feeder 8 Belt Conveyor 9 Image Camera 10 Short Pulse Laser 11 Spectrometer 12 Analysis Controller 13 Air Jet 14 Falling Chute 30 Refractory Grain 30a Metal line material refractory grain 30b Slag line material refractory grain 30c Impurity refractory grain

Claims (15)

A method for sorting used refractories,
Crushing step of crushing the used refractory,
A particle size adjusting step for adjusting a used refractory crushed by the crushing step to a predetermined particle size range;
Component separation for separating the refractory particles into a plurality of groups having the same main component based on the result obtained by performing component analysis on the used refractory particles having the particle size adjusted. Process,
A method for sorting used refractories, comprising: The used refractory is a used blast furnace refractory,
The plurality of groups includes a group of metal line materials mainly composed of Al ₂ O ₃ and a group of slag line materials mainly composed of SiC.
The method for sorting used refractories according to claim 1. A method for sorting used refractories,
Crushing step of crushing the used refractory,
A particle size adjusting step for adjusting a used refractory crushed by the crushing step to a predetermined particle size range;
Component separation for separating the refractory particles into a plurality of groups having the same main component based on the result obtained by performing component analysis on the used refractory particles having the particle size adjusted. Process,
A pulverizing step of pulverizing refractory particles belonging to at least one of the plurality of groups into refractory powder;
A method for sorting used refractories, comprising: a magnetic sorting step of sorting the refractory powder into magnetic powder and non-magnetic powder using magnetic force. The used refractory is a used blast furnace refractory,
The plurality of groups includes a group of metal line materials mainly composed of Al ₂ O ₃ and a group of slag line materials mainly composed of SiC,
The pulverization step pulverizes refractory particles belonging to the slag line material group into slag line material powder,
In the magnetic force sorting step, the slag line material powder is sorted into Al ₂ O ₃ powder and SiC powder using magnetic force.
The used refractory sorting method according to claim 3. The used refractory is a used blast furnace refractory,
The plurality of groups includes a group of metal line materials mainly composed of Al ₂ O ₃ and a group of slag line materials mainly composed of SiC,
The pulverization step pulverizes refractory particles belonging to the metal line material group into metal line material powder,
In the magnetic force sorting step, the metal line material powder is sorted into Al ₂ O ₃ powder and SiC powder using magnetic force.
The method for sorting used refractories according to claim 3 or 4. The component separation step includes, before or after the component analysis, separating the refractory particles including bare metal iron from the refractory particles using magnetic force.
The method for sorting used refractories according to any one of claims 1 to 5. The method for sorting used refractories according to claim 1, wherein the component analysis uses laser-induced breakdown spectroscopy.   The used refractory sorting method according to claim 3, wherein the magnetic force sorting step uses a magnet having a magnetic flux density of 0.6 T or more. A used refractory sorting device,
Crushing means for crushing the used refractory,
Particle size adjusting means for adjusting the used refractory crushed by the crushing means to a predetermined particle size range,
Component separation for separating the refractory particles into a plurality of groups having the same main component based on the result obtained by performing component analysis on the used refractory particles having the particle size adjusted. Means,
An apparatus for sorting used refractories, comprising: The crushing means crushes used blast furnace refractories,
The component separation means separates the refractory particles into a plurality of groups including a group of metal line materials mainly composed of Al ₂ O ₃ and a group of slag line materials mainly composed of SiC. ,
The used refractory sorting apparatus according to claim 9. A used refractory sorting device,
Crushing means for crushing the used refractory,
Particle size adjusting means for adjusting the used refractory crushed by the crushing means to a predetermined particle size range,
Component separation for separating the refractory particles into a plurality of groups having the same main component based on the result obtained by performing component analysis on the used refractory particles having the particle size adjusted. Means,
Pulverizing means for pulverizing refractory particles belonging to at least one of the plurality of groups into refractory powder;
A used refractory sorting apparatus, comprising: a magnetic sorting means for sorting the refractory powder into a magnetic powder and a non-magnetic powder using a magnetic force. The crushing means crushes used blast furnace refractories,
The component separating means separates the refractory particles into a plurality of groups including a group of metal line materials mainly composed of Al ₂ O ₃ and a group of slag line materials mainly composed of SiC. ,
The pulverizing means pulverizes refractory particles belonging to the slag line material group into slag line material powder,
The magnetic force sorting means is for sorting the slag line material powder into Al ₂ O ₃ based powder and SiC based powder using magnetic force.
The used refractory sorting apparatus according to claim 11. The component separation means is further capable of separating the refractory particles including ingots from the refractory particles using magnetic force.
The used refractory sorting apparatus according to any one of claims 9 to 12.   The used refractory sorting apparatus according to claim 9, wherein the component separation means includes a laser-induced breakdown spectrometer.   The used refractory sorting apparatus according to claim 9, wherein the magnetic force sorting unit includes a magnet having a magnetic flux density of 0.6 T or more.

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