JP2013215721A - Facility and method for recovering metal in slag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a facility and method for recovering metal in slag, capable of high accurately separating/recovering metal in slag (i.e., iron particles in ironmaking slag) in a short time.SOLUTION: A facility 10 for recovering metal in slag includes a slag charging chute 1 for charging slag 8 (metal particles 8b and slag 8a having a silica compound as a main constituent are fixed with each other), a rotary crushing device (a pin setting base 2 and a crushing pin 3) for crushing the slag 8 by making a rotor collide with the charged slag 8, a fixed sieve 5 for performing separation into a material smaller in size than the sieve mesh and a material larger in size than the sieve mesh with the rotary crushing device, a metal particle recovering device (a shutter 6, a recovery duct 7) for recovering the material scattered in the rotary direction of the crushing pin 3 as metal particles 8b, a crushing chamber 4, and a base part 9.

Description

  The present invention relates generally to a metal recovery facility and recovery method for separating and recovering metal particles mixed in slag, and in particular, a rotating body (for example, a hammer or a pin) for slag mixed with metal particles. The present invention relates to a slag metal recovery facility and a recovery method for separating and recovering metal particles using a difference in toughness (pulverization strength difference) between metal particles and slag when an impact force is applied.

  For example, in a steel plant, a large amount of steel slag is generated. Generally, iron is produced by reducing iron oxide in iron ore using coal. The by-product generated at this time is iron slag, and iron (iron particles) is also mixed in these iron slag. The iron particles are often in a state of being adhered so that the iron particles are surrounded by the slag, rather than the case where the iron particles exist as a single body. Conventionally, various methods have been proposed as means for collecting iron particles in iron slag.

  As methods for recovering iron particles from iron slag, magnetic sorting, specific gravity sorting, and classification sorting are widely used.

  Here, magnetic separation is a technique for separating and recovering iron particles by utilizing the magnetic difference between iron particles, which are ferromagnetic materials, and slag, which is mainly composed of weak magnetic materials and non-magnetic materials.

  Specific gravity sorting is a technique for separating and collecting iron particles by utilizing the specific gravity difference between the iron particles and slag.

  In addition, classification and sorting is a method of separating by the difference in particle size between the iron particles after pulverization and the slag by utilizing the difference in ductility and pulverization between the iron particles and other slag components.

  As classification classification, for example, slag containing iron particles is crushed and rolled with a ball mill, slag components are pulverized by crushing, and iron particles are processed into thin pieces by rolling, so that slag and iron particles A method of separating and recovering iron particles with a sieve so as to have different shapes (particle diameters) has been performed (for example, Patent Document 1).

  Similarly, as a classification selection, a method is provided in which a projection-like member is provided on the sieve, and the iron particles are separated and recovered by crushing the slag by the collision of the slag and the projection when falling, and classifying with the sieve. (For example, patent document 2).

JP-A-10-216545 Japanese Patent Laid-Open No. 2003-33496

  However, the method for recovering iron particles from iron slag as described above has the following problems.

  First, magnetic separation can accurately separate iron and slag when the amount of processing is small, but if the amount of processing is increased, the amount of slag is caught between iron and the magnet, which reduces the separation accuracy, so it can be used for mass processing. There is a problem that is not suitable. Further, when slag is attached around the iron particles (particularly when slag and iron particles are adhered), separation and recovery are impossible unless pulverization is performed.

  Further, when the specific gravity selection is performed by a dry method, there is a problem that high-precision separation cannot be performed unless the specific gravity difference of the separated material is large. Furthermore, when slag is adhered around the iron particles, separation and collection are impossible unless pulverization is performed. Further, in the case of wet processing, separation can be performed with high precision even if the specific gravity difference is small, but there is a problem that running cost becomes large because water treatment has to be performed.

  In addition, the classification and sorting described in Patent Document 1 uses a ball mill, and the pulverized product cannot be continuously discharged to the outside. Further, since the ball mill has a relatively long crushing time as compared with other crushing methods, there is a problem in that the amount of processing per hour cannot be increased.

  In addition, the classification and screening described in Patent Document 2 has a problem that the separation accuracy is poor because the slag adhering to the iron particles cannot be completely removed only by the drop collision. In addition, there is a possibility that the dropped slag does not collide with the protrusion, and in that case, separation and recovery cannot be performed at all.

  This invention is made | formed in view of the above situations, The metal content in slag which can isolate | separate and collect | recover the metal content in a slag (for example, iron particle in iron-making slag) with high precision in a short time. The object is to provide equipment and recovery methods.

  In order to solve the above problems, the present invention has the following features.

  [1] A slag metal recovery facility for separating and recovering metal particles present in slag, wherein a pulverizing chamber into which slag containing metal particles is charged, and a rotating body collide with the slag to slag A rotary crusher for crushing, a sieve provided below the crushing chamber, separating a material having a size passing through a sieve and a material having a size not passing through a sieve, and provided above the crushing chamber An apparatus for recovering metal in slag, comprising: a metal particle recovery device that recovers a metal particle that has been blown in the rotating direction of the rotating body.

  [2] The metal particle recovery device includes a recovery duct for recovering metal particles, and a shutter device for preventing an object having a size passing through the mesh of the sieve from entering the recovery duct. The metal recovery facility for slag as described in [1] above.

  [3] A slag metal recovery facility for separating and recovering metal particles present in the slag, the pulverizing chamber into which the slag containing the metal particles is charged, and a rotating body colliding with the slag in the slag chamber. A rotary crusher for crushing, a sieve provided below the crushing chamber, separating a material having a size passing through a sieve and a material having a size not passing through a sieve, and provided below the crushing chamber And a metal particle recovery device that recovers the metal particles flying in the rotation direction of the rotating body as metal particles, and the metal particle recovery device includes a recovery duct for recovering metal particles, and A metal device for recovering metal in a slag, comprising a shutter device for preventing an object having a size passing through a sieve mesh from entering.

  [4] The above-mentioned [2], wherein the shutter device is closed for a certain period of time after the slag is thrown to prevent an object having a size passing through the sieve mesh from entering the recovery duct. [3] The metal recovery facility for slag according to [3].

  [5] Any of the above [1] to [4], wherein the rotary crushing device rotates one or more hammers or pins and crushes the slag by a collision force between the rotating hammer or pins and the slag. Metal recovery equipment for slag as described in Crab.

  [6] The length of the recovery duct is a length that allows the metal particles to fly and pass among the items that have been blown into the recovery duct, and the slag that is not the metal particles cannot fly in the middle. The metal recovery equipment for slag according to any one of [1] to [5], wherein the metal recovery equipment has a length falling into the recovery duct.

  [7] A facility for recovering metal in slag as described in [6], wherein a fan is installed in the recovery duct, and the length by which the slag that is not metal particles can fly by air blown from the fan is suppressed. .

  [8] A method for recovering metal in a slag that separates and recovers metal particles present in the slag, wherein the slag is smashed by colliding a rotating body with the slag in which the metal particles are present; A method for recovering a metal in slag, comprising: a sieving step for separating the pulverized product by size with a sieve; and a metal particle recovery step for recovering as a metal particle a product that has been blown in the rotational direction of the rotating body. .

  [9] In the metal particle recovery step, the collection of metal particles is stopped for a certain period of time after the slag is added in order to prevent an object having a size passing through the sieve of the sieve from being mixed into the metal particles and recovered. The method for recovering metal in slag as described in [8] above.

  [10] A recovery duct for recovering as a metal particle the object that has been blown in the rotating direction of the rotating body in the metal particle recovery step is installed, and the length of the recovery duct has been skipped in the recovery duct Among the objects, the metal particles have such a length that they can fly and pass through, and the slag that is not metal particles cannot fly and has a length that falls in the recovery duct on the way [8] ] Or the metal recovery method in slag as described in [9].

  [11] The method for recovering metal in slag as described in [10], wherein a fan is installed in the recovery duct, and a length by which the slag that is not metal particles can fly is suppressed by blowing air from the fan.

  In the present invention, a metal component in slag (for example, iron particles in iron slag) can be separated and recovered with high accuracy in a short time.

It is a side view which shows Embodiment 1 of this invention. It is a side view which shows Embodiment 2 of this invention. It is a front view which shows Embodiment 2 of this invention. It is a side view which shows Embodiment 3 of this invention.

  In the present invention, the slag content and the metal particles are easily crushed, and the slag content is pulverized until it becomes fine, whereas the metal particles do not become fine, so that they are separated and recovered. .

  Embodiments of the present invention will be described with reference to the drawings.

[Embodiment 1]
FIG. 1 is a side view showing an in-slag metal recovery facility 21 according to Embodiment 1 of the present invention.

  The metal recovery equipment 21 in the slag according to the first embodiment pulverizes slag containing metal particles by rotating a rotating body (pin), and separates the pulverized product with a sieve. Is pulverized until it becomes smaller than the sieve mesh of the sieve by this pulverization, and separated under the sieve, and the metal particles are not crushed, so it does not become smaller than the sieve mesh of the sieve, and the rotation direction of the pin due to wind pressure by rotation or collision with the pin 1 is a metal recovery facility in a pin mill type slag that is recovered in a dry manner as metal particles from a recovery duct. As shown in FIG. 1, slag 8 (metal particles 8b and a slag component 8a mainly composed of a silica compound are included. Slag charging chute 1 for charging), a rotary pulverizing device (pin installation base 2, pulverizing pin 3) for pulverizing the slag 8 by causing a rotating body to collide with the slag 8 charged, and a rotary pulverizing device. A fixed sieve 5 that separates the pulverized material by its size, a metal particle recovery device (shutter 6 and recovery duct 7) that recovers the material blown in the rotational direction of the pulverizing pin 3 as metal particles 8b, and pulverization The chamber 4 and the base part 9 are provided.

  Here, many pin 3 for grinding | pulverization is attached to the pin installation base 2, and when the pin installation base 2 rotates, the pin 3 for grinding | pulverization can be rotated simultaneously.

  In such a slag metal recovery facility 21, when slag 8 (slag portion 8 a, metal particles 8 b) is charged from the slag charging chute 1, the crushing pin that rotates while the slag 8 falls in the crushing chamber 4. 3 collided with the crushing chamber 4 many times or after colliding with the crushing chamber 4, and the slag portion 8a is crushed by the impact. At that time, the slag portion 8a (pulverized until it becomes fine) is separated from the metal particles 8b (not pulverized until it becomes fine) by the impact force and shear force of the pulverizing pin 3, and the slag portion 8a (pulverized product) is further separated. By further collision with the crushing pin 3, it is crushed into fine particles. And the slag part 8a which is a ground material is collect | recovered as the sieving under the sieve 5. FIG. On the other hand, the metal particles 8b that are hard to be pulverized compared to the slag content are almost kept in size when they are put into the pulverization chamber, and therefore are on the screen of the sieve 5, and the inside of the pulverization chamber 4 rotates the pulverization pin 3 It circulates in the direction and is recovered from a recovery duct 7 provided with a recovery port on the inner wall of the crushing chamber 4. Considering the workability at the time of reusing the recovered metal particles and the recovery efficiency of the metal particles, it is usually preferable to recover the metal particles having a particle size of 1 mm to 3 mm. Moreover, since a slag part can be grind | pulverized to the magnitude | size of less than 1 mm-less than 3 mm by grind | pulverizing with a rotary body, a sieve with a mesh size of 1 mm-3 mm is normally used.

  At this time, the recovery port of the recovery duct 7 is provided above the crushing chamber 4 (above the horizontal line passing through the rotation axis of the pin installation base 2 that is a rotating body), so that the slag component pulverized into fine particles can be recovered. Therefore, it becomes possible to collect metal particles with less slag content.

  When the slag portion 8a is difficult to be crushed and a slag portion 8a having a size larger than the mesh size of the sieve 5 is generated (in other words, the unground slag 8 in which the metal particles 8b and the slag portion 8a are condensed is sufficiently pulverized. If not separated), the slag portion 8a having a size larger than the mesh size of the sieve 5 is closed by closing the shutter 6 for a certain time after the slag 8 is charged (the time determined in advance from the operation results). By increasing the circulation time of the slag 8 and the slag portion 8a while preventing the unground slag 8 from mixing into the recovery duct 7, the wind pressure caused by the rotation of the pulverizing pin 3 causes the slag 8 and the slag portion 8a to rotate. And crushed with the crushing pin 3 and separated and recovered into the slag content 8a (the product pulverized until it becomes smaller than the sieve mesh) and the metal particles 8b (the product that is not pulverized until it becomes smaller than the sieve mesh). Can .

  Thus, in the first embodiment, after the slag portion 8a is crushed by colliding the rotating body (pulverizing pin 3) with the slag 8, the pulverized material is recovered as the slag portion 8a under the sieve, and the slag portion The shutter 6 is closed until the 8a almost disappears from the crushing chamber, and then the shutter 6 is opened so that the screen 5 is blown in the rotation direction of the crushing pin 3 due to the wind pressure by the rotation or the collision with the crushing pin 3. A material that has not been crushed until it becomes smaller than the sieve mesh can be recovered from the recovery duct 7 as metal particles 8b. In this case, even if the recovery port (metal particle recovery port) of the recovery duct 7 is provided above the crushing chamber 4 (above the horizontal line passing through the rotation axis of the pin mounting base 2 which is a rotating body), You may provide below (below the horizontal line which passes along the rotating shaft of the pin installation base 2 which is a rotary body).

  Incidentally, when the recovery port (metal particle recovery port) of the recovery duct 7 is provided below the crushing chamber 4 (below the horizontal line passing through the rotation axis of the pin installation base 2 which is a rotating body), the slag portion 8a is recovered. In order to prevent this, the shutter 6 is provided in front of the recovery port of the recovery duct 7, and the shutter 6 is closed until the slag portion 8 a from the pulverization chamber 4 almost disappears. It is important to open the shutter 6.

  Thereby, this metal recovery equipment 21 in slag has the following effects.

  (A) The slag 8 can be continuously fed from the top of the rotary pulverizer in a dry manner and further subjected to continuous separation / recovery processing. The rotary pulverizer can reduce the slag content 8a in a short time compared to a ball mill. Since pulverization is possible, the throughput can be greatly improved. In addition, since the pulverization step (pulverization of the slag portion 8a) and the separation step (separation of the slag portion 8a and the metal particles 8b) can be performed at the same time, it is necessary to perform the pulverization step independently such as magnetic force selection and specific gravity selection. There is no, it is efficient.

  (B) Further, since the impact force and the shearing force are repeatedly applied to the metal particles 8b by the rotation of the rotating body (grinding pin 3), the slag portion 8a fixed by all the metal particles 8b can be completely removed. As a result, the metal particles 8b and the slag portion 8a can be separated and recovered with high accuracy.

  (C) Furthermore, since almost the entire amount of the slag 8a is collected under the sieve, no entanglement as seen in magnetic sorting occurs. Moreover, since it is dry separation, the water treatment cost does not occur.

  In this embodiment, the slag is pulverized by rotating the pin. However, the slag may be pulverized by rotating the hammer, and the rotation speed may be appropriately selected as long as the slag is pulverized. be able to.

[Embodiment 2]
2 and 3 are a side view and a front view showing the metal recovery facility 22 in the slag according to the second embodiment of the present invention.

  As shown in FIGS. 2 and 3, the slag metal recovery facility 22 according to the second embodiment has basically the same configuration as the slag metal recovery facility 21 according to the first embodiment. The configuration of the crushing pin 3 is different.

  That is, the slag metal recovery facility 22 includes a large number of fixed pins 3 a fixed to the crushing chamber 4 and a large number of rotating pins 3 b installed on the pin installation base 2 as the crushing pins 3.

  As a result, the rotation of the pin mounting base 2 by the motor 10 causes the rotation pin 3b to rotate at the same time, and the slag 8 is crushed by the shearing and impact force of the rotation pin 3b and the fixed pin 3a.

  Moreover, in this metal recovery equipment 22 in the slag, the length of the recovery duct 7 is the length that allows the metal particles 8b to fly and pass among the items that have been blown into the recovery duct 7, and the slag component. 8a is the length which cannot fly and falls in the collection | recovery duct 7 on the way.

  Specifically, as shown in FIG. 2, after the recovery duct 7 is directed upward from the recovery port, the shape is directed downward, and the length position (height position) where the direction changes from the upper side to the lower side is Of the items that have been blown into the recovery duct 7, the metal particles 8b are in a length position (height position) where they can fly and pass, and the slag portion 8a cannot fly and enters the recovery duct 7 halfway. It is the falling position (height position).

  That is, the slag portion 8a has a specific gravity of about 1/3 of the specific gravity of the metal particles (for example, iron particles) 8b, and is easily crushed, so it is often a fine particle and is slowed down by air resistance than the iron particles 8b. Cheap. Therefore, based on the speed (injection speed) at which the iron particles 8b and the slag portion 8a are blown into the recovery duct 7 and the specific gravity, the respective flight distances (flights) of the slag portion 8a and the iron particles 8b due to the influence of air resistance. (Height) is calculated, and the length of the portion (uppermost height position) toward the upper side of the recovery duct 7 is equal to or greater than the flight distance (flight height) of the slag 8a, and the flight distance (flight height) of the iron particles 8b. Even if the slag portion 8a is mixed with the iron particles 8b and injected into the recovery duct 7, the iron particles 8b are recovered through the uppermost height position, and the slag portion 8a is stored in the recovery duct 7. , And it does not come out of the system from the recovery duct 7, so that the recovery accuracy is improved.

  Further, if the length (height) of the recovery duct 7 cannot be sufficiently secured and the slag portion 8a does not fall in the recovery duct 7 as it is, a fan 11 is attached to the recovery duct 7 as shown in FIG. It is installed and the flying distance (flying height) of the slag portion 8a is suppressed by blowing air from the fan 11, and the iron particles 8b are recovered through the highest height position, and the slag portion 8a falls in the recovery duct 7. You just have to do it.

[Embodiment 3]
FIG. 4 is a side view showing the slag metal recovery facility 23 according to Embodiment 3 of the present invention.

  As shown in FIG. 4, the slag metal recovery facility 23 according to the third embodiment is basically configured in the same manner as the slag metal recovery facility 22 according to the second embodiment described above. 3 is different in that the hammer 13 is attached to the hammer installation base 12.

  Accordingly, the hammer 13 rotates simultaneously with the rotation of the hammer installation base 12, and the hammer 13 rotates in an arc shape around the attachment portion with the hammer installation base 12. Therefore, the peripheral speed at the tip of the hammer 13 can be made higher than the rotational speed of the hammer installation base 12. The slag 8 is crushed by the impact force when the hammer 13 and the slag 8 collide.

  In FIG. 4, the shutter 6 is not installed, but the shutter 6 may be installed similarly to the metal recovery facilities 21 and 22 in the slag.

DESCRIPTION OF SYMBOLS 1 Slag throwing chute 2 Pin installation base 3 Crushing pin 3a Fixed pin 3b Rotating pin 4 Crushing chamber 5 Fixed sieve 6 Shutter 7 Collection duct 8 Slag 8a Slag 8b Metal particle 9 Base part 10 Motor 11 Fan 12 Hammer installation base 13 Hammer 21 Metal recovery facility for slag 22 Metal recovery facility for slag 23 Metal recovery facility for slag

Claims (11)

  A slag metal recovery facility that separates and recovers metal particles present in the slag, and a pulverization chamber into which the slag containing the metal particles is charged, and a rotation in which the slag is pulverized by colliding a rotating body inside the pulverization chamber. Type crusher, a sieve provided below the crushing chamber, separating a size passing through a sieve and a size not passing through a sieve, and provided above the crushing chamber and rotating An apparatus for recovering metal in slag, comprising: a metal particle recovery device that recovers metal particles that have been blown in the direction of rotation of the body as metal particles.   The metal particle recovery device includes a recovery duct for recovering metal particles, and a shutter device for preventing an object having a size passing through the mesh of the sieve from entering the recovery duct. The metal collection | recovery equipment in slag of Claim 1 to do.   A slag metal recovery facility that separates and recovers metal particles present in the slag, and a pulverization chamber into which the slag containing the metal particles is charged, and a rotation in which the slag is pulverized by colliding a rotating body inside the pulverization chamber. Type crusher, a sieve provided below the crushing chamber and separating an article having a size passing through a sieve and an article having a size not passing through a sieve, and provided below the crushing chamber and rotating A metal particle recovery device that recovers metal particles that have been blown in the direction of rotation of the body as metal particles, the metal particle recovery device recovers the metal particles, and a sieve sieve for the recovery duct. A metal device for recovering metal in slag, comprising a shutter device for preventing an object having a size passing through the eye from entering.   The said shutter apparatus is closed for a fixed time after throwing in slag, The thing of the magnitude | size which passes along the sieve mesh of the said sieve is prevented from mixing in the said collection | recovery duct. Metal recovery equipment for slag.   5. The slag according to claim 1, wherein the rotary crusher rotates one or more hammers or pins and crushes the slag by a collision force between the rotating hammers or pins and the slag. Metal recovery equipment.   The length of the recovery duct is the length that allows the metal particles to fly and pass among the items that have been blown into the recovery duct, and the slag that is not metal particles cannot fly and is recovered in the middle. The metal recovery facility for slag according to any one of claims 1 to 5, wherein the metal recovery facility has a length falling into the duct.   The metal recovery equipment for slag according to claim 6, wherein a fan is installed in the recovery duct, and a length capable of flying a slag that is not metal particles is suppressed by blowing air from the fan.   A method for recovering metal in slag by separating and recovering metal particles present in slag, comprising a pulverizing step of colliding a rotating body with slag in which metal particles are present and pulverizing slag, and an object to be crushed in the pulverizing step. A method for recovering a metal in slag, comprising: a sieving step of separating by size with a sieve; and a metal particle recovery step of recovering as a metal particle an object that has been blown in the rotating direction of the rotating body.   In the metal particle recovery step, the collection of the metal particles is stopped for a certain period of time after the slag is added in order to prevent an object having a size passing through the sieve of the sieve from being mixed into the metal particles and recovered. The method for recovering a metal in a slag according to claim 8, wherein the metal is recovered.   In the metal particle recovery process, a recovery duct is provided for recovering as a metal particle an object that has been blown in the rotating direction of the rotating body, and the length of the recovery duct is the length of the object that has been skipped in the recovery duct. The metal particles have such a length that they can fly and pass through, and the slag that is not metal particles has a length that does not fly and falls into the recovery duct on the way. The metal recovery method in slag as described.   The method for recovering metal in slag according to claim 10, wherein a fan is installed in the recovery duct, and a length by which the slag that is not metal particles can fly is suppressed by blowing air from the fan.

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