JP4998667B2 - Sizing ore sizing method and rocking classifier used therefor - Google Patents

Description

  The present invention relates to a sinter ore sizing method for adjusting the particle size (sizing) to a sinter having an appropriate particle size as a blast furnace raw material by crushing and classifying the fired sinter ore, and the shaking used at that time. It relates to a dynamic classifier.

  A conventional sinter ore sizing method is shown in FIG. The sintered ore fired on the sinter 1 with a pallet of about 5 m × 1 m is roughly crushed to a size of about 200 mm by the primary crusher 2. The coarsely crushed sintered ore is cooled by the cooler 3 and then sieved by a first stage sieve 55 having a mesh screen of about 100 mm. The massive sintered ore exceeding 100 mm that has been screened on the sieve by the first-stage sieve 55 is supplied to the secondary crusher 4 and crushed with a target of 50 mm or less. The sintered ore crushed by the secondary crusher 4 merges with the lower sieve of the first stage sieve 55 and is supplied to the second stage sieve 56. Then, the screen mesh of the second-stage sieve 56, the third-stage sieve 57, the fourth-stage sieve 58 and the screen is sequentially reduced, and on the sieves of the respective sieves 56 to 58, 5 to 50 mm, which is an appropriate particle size as a blast furnace raw material. The sintered ore having a particle size is sieved, and the sieved sintered ore having a particle size of 5 mm to 50 mm is supplied to the blast furnace 10. In addition, the sintered ore having a particle size of 5 mm or less (hereinafter referred to as pulverized ore) generated during the crushing and classification is recovered as the sieve under the fourth stage sieve 58 and is again used as a sintering material as a sintering machine. Returned to 1

  And, as the primary crusher 2, a single spike roll crusher in which a claw-like crusher called a demon tooth is provided on one roll is used, and the secondary crusher 4 is opposed to the primary crusher 2. A double roll crusher is used in which teeth that mesh with each other are provided on two rolls. In addition, a vibrating sieve having an amplitude of several millimeters is used for each of the first-stage sieve 55 to the fourth-stage sieve 58 serving as a classifier.

  A problem in the conventional sinter ore sizing method as described above is that the generation ratio (pulverization rate) of the pulverized ore to the baked sintered ore is considerably large. It has reached ~ 30%. The fact that there are many pulverized ores that are inappropriate as blast furnace raw materials and returned to the sintering machine means that productivity of the sinter ore sizing process is reduced and excess energy is consumed. Therefore, it is important to reduce the powdering rate in the sizing process.

  One of the reasons for the high pulverization rate in the sinter ore sizing process is that multiple-stage vibrating sieves are used to classify a large amount of sintered ore. There is a problem that pulverized ore is generated by pulverizing due to a transport drop while transferring the sieve.

  In view of this, several techniques have been proposed that attempt to reduce the powdering rate in the sizing process by improving the classification process using a vibrating sieve.

  For example, in Patent Document 1, by using a primary vibrating sieve arranged upstream of a crusher, an intermediate-sized sintered ore that is easily pulverized is collected in advance to reduce the load on the secondary vibrating sieve. A technique for improving classification efficiency and reducing the pulverization rate is disclosed.

  Further, in Patent Document 2, by reducing the sieve area of the second stage vibrating sieve arranged downstream of the crusher and reducing the supply amount to the third stage vibrating sieve, A technique that attempts to suppress the generation of pulverized ore is disclosed.

  However, in any of the techniques described in Patent Document 1 or Patent Document 2, in any case, a multi-stage vibrating sieve is used as a classifier, and thus the sintered ore transfers the multi-stage vibrating sieve. The problem that pulverized ore is generated by pulverizing due to a transport drop in the meantime is inevitable.

  Furthermore, the problem in the conventional sinter ore sizing method as shown in FIG. 6 is that the tops of the vibrating sieves 56 to 58 are collected as sintered ore for blast furnace raw material, As a result, an improper sintered ore having a particle size exceeding 50 mm may be conveyed to the blast furnace.

That is, as shown in FIG. 7, even if the roll interval Gp of the secondary crusher 4 is set to the upper limit value (50 mm) of the appropriate particle size range, the long side exceeds the upper limit value (50 mm). In the conventional method of sinter ore sizing as shown in FIG. 6, an elliptical crushed object whose long side exceeds the upper limit value is generated in each vibrating sieve 56. It is sieved on ˜58 sieves, conveyed as a blast furnace raw material, and stored in a raw material hopper. As a result, clogging may occur due to conveyor conveyance or raw material hopper cutting out, which may cause trouble.
Japanese Patent Laid-Open No. 6-279872 JP 2001-181714 A

  The present invention has been made in view of the circumstances as described above. When the sintered ore is crushed and classified to adjust the particle size to a sintered ore having an appropriate particle size as a blast furnace raw material, Suppressing the generation and reducing the pulverization rate, and suitable for use in the sinter ore sizing method in which sintered ore with a particle size exceeding the proper range is not transported as blast furnace raw material An object of the present invention is to provide a simple swing classifier.

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

[1] In a sinter ore sizing method for adjusting the particle size to a sintered ore in a predetermined particle size range by crushing and classifying the sintered ore, When classifying into a sintered ore having a particle size smaller than a predetermined particle size range, a sintered ore having a particle size within a predetermined particle size range, and a sintered ore having a particle size larger than a predetermined particle size range, a first mesh having a predetermined mesh size is provided. A screen and a second screen having a mesh size larger than the first screen are inclined and arranged in series in that order from above, and the first screen and the second screen are arranged in an order by an eccentric drive mechanism. Using an oscillating classifier that performs an oscillating motion such that the sinter on the first screen and the second screen is reciprocated in the vertical direction and the inclined direction so as to feed the inclined ore downward. The predetermined A sintered ore having a particle size smaller than a particle size range is classified under the first screen, and a sintered ore having a particle size within the predetermined particle size range is classified under the second screen. Sizing method of sintered ore.

[2] In the sinter ore sizing method for adjusting the particle size to a sintered ore having a predetermined particle size range by crushing and classifying the sintered sinter, A sinter with a particle size smaller than a predetermined particle size range, a sinter with a particle size smaller than a predetermined particle size range, a sinter with a larger particle size even within a predetermined particle size range, and a particle size larger than a predetermined particle size range. When classifying into sintered ore, a first screen having a predetermined mesh size, a third screen having a mesh size larger than the first screen, and a second screen having a mesh size larger than the third screen. screen is arranged in that order from above inclined respectively in series, the first screen and the third screen and the second screen and said third scan and the first screen by the eccentric drive mechanism Using an oscillating type classifier performing swinging motion so as to reciprocate in the vertical direction and the inclined directions as the sintered ore on the lean second screen applying a feed of the inclined downwardly, The sinter having a particle size smaller than the predetermined particle size range is classified under the sieve of the first screen, and the sinter having a small particle size even in the predetermined particle size range is classified under the sieve of the third screen. A sinter ore sizing method comprising classifying a sinter having a large particle size even in the predetermined particle size range under a sieve of the second screen.

  [3] Sintered ore having a particle size larger than a predetermined particle size range is crushed again and supplied to the classifier again. The sinter ore sizing according to [1] or [2] Method.

[4] A swing type classifier for use in classifying the sintered ore, a second screen having a larger mesh size than the first screen and the first screen having a predetermined mesh size are inclined respectively They are arranged in this order from above in series, reciprocating to such oscillating movement in the vertical direction and the inclined direction to exert the feeding of the inclined downwardly relative to sinter on the first screen and the second screen the includes a first screen and the eccentric drive mechanism for causing the second screen, and sinter the mesh size smaller particle size of the first screen is larger than the mesh of the first screen, the second screen and sintered ore of mesh size smaller particle sizes of rocking classifier, characterized by classifying the second mesh size larger particle size of the screen sinter.

[5] A peristaltic classifier used for classification of sintered ore, a first screen having a predetermined mesh size, a third screen having a mesh size larger than the first screen, and the third screen A second screen having a larger mesh size is inclined and arranged in series from the top in that order, and the vertical direction and the inclination direction so as to feed the sintered ore on each screen downward in the inclination. in includes an eccentric drive mechanism for causing oscillating movement such that reciprocate each screen, and sinter the mesh size smaller particle size of the first screen is larger than the mesh of the first screen, the third and sintered ore of mesh size smaller particle size of the screen, greater than the third screen mesh, and a second mesh size smaller particle size of the screen sinter, second screening Swing type classifier, characterized in that the mesh size larger particle size sinter classification.

  In the present invention, a classifier having a plurality of screens having different mesh sizes is used to classify sintered ore having a predetermined particle size range under the screen sieve. Suppressing the generation of powdered ore can reduce the powdering rate, and sintered ore with a particle size exceeding the specified particle size range is classified on the sieve, so sintering with an inappropriate particle size Ore is no longer transported as blast furnace raw material, and troubles in conveyor transport and raw material hoppers can be avoided.

  A first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a process flow diagram in the sinter ore sizing method according to the first embodiment of the present invention, and FIG. 2 is an explanatory view of an oscillating classifier used at that time.

  In this embodiment, as shown in FIG. 1, the sintered ore fired with a pallet of about 5 m × 1 m in the sintering machine 1 is roughly crushed to a size of about 200 mm by the primary crushing machine 2. The The coarsely crushed sintered ore is cooled by the cooler 3 and then supplied to the secondary crusher 4 where it is crushed with a target size of 50 mm or less. The sintered ore crushed by the secondary crusher 4 is supplied to the swing classifier 8. And in the rocking classifier 8, the sintered ore having a particle size suitable as a blast furnace raw material (5 mm to 50 mm) and the sintered ore having a particle size smaller than the lower limit (5 mm) of the appropriate particle size range, Each is classified as a sieve. In addition, sintered ore having a particle size larger than the upper limit (50 mm) of the appropriate particle size range, such as the oval crushed material shown in FIG. 7, is classified on a sieve. Thereafter, the classified sintered ore having a particle size of 5 mm to 50 mm is supplied to the blast furnace 10. Further, the sintered ore (pulverized ore) having a particle size smaller than 5 mm is recovered and returned again to the sintering machine 1 as a sintering raw material.

  As shown in FIG. 2, the oscillating classifier 8 used in this embodiment includes a first screen 15 and a second screen 16 that are inclined inside the chamber 14 and arranged in series from above. In addition, the mesh of the first screen 15 has a lower limit value 5 mm of the predetermined particle size range, and the mesh of the second screen 16 has an upper limit value 50 mm of the predetermined particle size range. The first screen 15 and the second screen 16 are inclined and fed to the sintered ore on the first screen 15 and the second screen 16 by an eccentric drive mechanism 17 such as a crank mechanism or a planetary gear. The rocking motion is performed so as to reciprocate in the vertical direction and the tilt direction. As a result, the amplitude can be increased as compared with existing vibrating sieves, and the repulsive force can be applied to the sintered ore to increase the classification efficiency.

  When the sinter is supplied from the secondary crusher 4 to such an oscillating classifier 8, the first screen 15 classifies the sintered ore with a particle size smaller than 5 mm (pulverized ore) under the sieve. By the classification by the second screen 15, sintered ore (appropriate grains) having a particle size of 5 mm to 50 mm is recovered under the sieve, and the sintered ore having a particle size larger than 50 mm is collected on the sieve of the second screen 15. Coarse grains) are recovered.

  Thereafter, as described above, the sintered ore having a particle size of 5 mm to 50 mm is supplied to the blast furnace 10, and the sintered ore (pulverized ore) having a particle size smaller than 5 mm is recovered, and again as a sintering raw material, a sintering machine Returned to 1

  As described above, in this embodiment, the oscillating classifier 8 having two types of screens having different mesh sizes is used to classify into three types of powdered ore, appropriate grains, and coarse grains. In addition, the generation of pulverized ore due to a transport drop while transferring a plurality of classifiers (vibrating sieves) as in the past is suppressed, and the pulverization rate can be reduced. In addition, the appropriate particles are classified under the second screen sieve and conveyed as a blast furnace raw material, and the improper coarse particles are classified and recovered on the second screen 15 sieve. Is not transported as blast furnace raw material, and troubles in the conveyor and raw material hopper can be avoided.

  The swing classifier 8 can take two forms as shown in FIG.

  First, what is shown in FIG. 3A is the one used in this embodiment (FIG. 2). Inside the chamber 14, the first screen 15 (mesh size is 5 mm) and the second screen 16 from above the inclination. They are arranged in series in the order of (mesh size is 50 mm), classified under the sieve of the first screen 15, appropriate particles are classified under the sieve of the second screen 15, and coarse particles are classified on the sieve of the second screen 15. It is what you do.

  On the other hand, as shown in FIG. 3B, the first screen 15 (mesh size is 5 mm) and the second screen 16 (mesh size is 50 mm) are arranged in the vertical direction inside the chamber 14 from below. The coarse particles are classified on the sieve of the second screen 15, the appropriate particles are classified on the sieve of the first screen 15 under the sieve of the second screen 15, and the powdered ore is classified under the sieve of the first screen 15. It is a thing.

  Next, a second embodiment of the present invention will be described.

  FIG. 4 is a process flow diagram in the sinter ore sizing method according to the second embodiment of the present invention. In this second embodiment, in the sinter ore sizing method according to the first embodiment, coarse particles (sintered ore having a particle size larger than 50 mm) classified on the sieve of the second screen 15 are classified. Then, after being supplied again to the secondary crusher 4 and crushed, it is supplied again to the swing classifier 8. That is, it is a three-class classification type closed circuit sizing process.

  In such a second embodiment, the roll interval Gp of the secondary crusher 4 is widened to suppress the generation amount of powdered material during crushing without applying excessive force to the sintered ore, and the roll interval The coarse particles produced by expanding Gp are collected on the screen of the second screen 15 and crushed again, so that the particle size distribution is adjusted. In addition, when the roll rotation speed of the secondary crusher 4 is made the same as that of the first embodiment by increasing the roll interval Gp, the processing amount (passage amount) per unit time is increased. Therefore, when the processing amount per unit time is the same as in the first embodiment, the roll rotation speed can be reduced, the impact force on the sintered ore during crushing can be reduced, and the amount of powdered material generated Can be suppressed.

  And also in this embodiment, since it is made to classify | categorize into three types, a powdered ore, a suitable grain, and a coarse grain, using the rocking | swiveling classifier 8 which has a screen of 2 types of different mesh sizes, As described above, the generation of pulverized ore due to a transfer drop while transferring a plurality of classifiers (vibrating sieves) is suppressed, and the pulverization rate can be reduced. In addition, appropriate grains are classified under the second screen sieve and conveyed as a blast furnace raw material, and improper coarse grains are classified on the second screen 15 sieve. As a result, troubles in the conveyor and raw material hopper can be avoided.

  In the above, using a classifier provided with a first screen 15 having a mesh size of 5 mm and a second screen 16 having a mesh size of 50 mm, a lower limit value (5 mm) of an appropriate particle size range. Classify the sinter with a smaller particle size under the sieve of the first screen 15, and classify the sinter with a particle size of an appropriate particle size range (5 mm to 50 mm) under the screen of the second screen 16. In addition, a third screen having a mesh size (for example, 15 mm) larger than the mesh size of the first screen 15 and smaller than the mesh size of the second screen 15 is the first screen 15 and the second screen 15. Using a classifier disposed in the middle of the screen 16, sintered ore having a particle size smaller than the lower limit (5 mm) of the appropriate particle size range is classified under the sieve of the first screen 15 to obtain an appropriate particle size. range( Sintered ore with a small particle size (5 mm to 15 mm) is classified under the sieve of the third screen to obtain a large particle size (15 mm to 50 mm) with an appropriate particle size range (5 mm to 50 mm). Can also be classified under the sieve of the second screen 16.

  As examples of the present invention, when the sintered ore is sized according to the first embodiment described above (Example 1 of the present invention) and when the sintered ore is sized according to the second embodiment (Example 2 of the present invention). FIG. 5 shows a comparison of the particle size distribution of the sintered ore after sizing with respect to the case where the sizing is performed by the conventional sizing method shown in FIG. 5 (conventional example).

  As a result, in the conventional example, the sintered ore having a particle size of 5 mm or less was 25%, and the sintered ore having an appropriate particle size of 5 mm to 50 mm was 72%. As a result, the sintered ore having an appropriate particle size of 5 mm to 50 mm was improved to 89%. Further, in the present invention example 2, the sintered ore having a particle size of 5 mm or less can be suppressed to 5%, and the sintered ore having an appropriate particle size of 5 mm to 50 mm is improved to 85%.

  Thereby, the excellent sizing effect of the present invention could be confirmed.

It is a processing flow figure in a 1st embodiment of the present invention. It is explanatory drawing of the rocking classifier used in the 1st Embodiment of this invention. It is a figure explaining the format of a rocking classifier. It is a processing flowchart in the 2nd Embodiment of this invention. It is a comparison figure of the particle size distribution of the sintered ore in the Example of this invention. It is a processing flow figure in a prior art. It is explanatory drawing of the crushing state in a secondary crusher.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sintering machine 2 Primary crusher 3 Cooling machine 4 Secondary crusher 8 Oscillating classifier 10 Blast furnace 14 Chamber 15 First screen 16 Second screen 17 Eccentric drive mechanism 54 Secondary crusher 55 First stage sieve 56 First Second stage sieve 57 Third stage sieve 58 Fourth stage sieve

Claims (5)

In the sinter ore sizing method for adjusting the particle size to a sintered ore having a predetermined particle size range by crushing and classifying the fired sintered ore, the crushed sintered ore is divided into a predetermined particle size range. A first screen having a predetermined mesh size for classification into a sinter having a smaller particle size, a sinter having a particle size in a predetermined particle size range, and a sinter having a particle size larger than a predetermined particle size range; A second screen having a mesh size larger than the first screen is inclined and arranged in series in that order from above, and the first screen and the second screen are arranged in that order by an eccentric drive mechanism. And an oscillating classifier that performs an oscillating motion that reciprocates in the vertical direction and the inclined direction so as to feed the sintered ore on the second screen downwardly inclined , Predetermined granularity A sintered ore having a particle size smaller than a range is classified under a sieve of the first screen, and a sintered ore having a particle size in the predetermined particle size range is classified under a sieve of the second screen. The sizing method of the ore. In the sinter ore sizing method for adjusting the particle size to a sintered ore having a predetermined particle size range by crushing and classifying the fired sintered ore, the crushed sintered ore is divided into a predetermined particle size range. A sinter with a smaller particle size, a sinter with a smaller particle size within a given particle size range, a sinter with a larger particle size within a given particle size range, and a sinter with a particle size larger than a given particle size range Are classified into a first screen having a predetermined mesh size, a third screen having a mesh size larger than the first screen, and a second screen having a mesh size larger than the third screen, respectively. inclined arranged in this order from above in series, the first screen and the third screen and the said and the first screen by the second screen and the eccentric drive mechanism a third screening Using an oscillating type classifier performing swinging motion so as to reciprocate in the vertical direction and the inclined direction to exert the feeding of the inclined downwardly relative to sintered ore on the second screen and the Sintering ore having a particle size smaller than a predetermined particle size range is classified under the sieve of the first screen, and a sintered ore having a small particle size even in a predetermined particle size range is classified under the sieve of the third screen; A sinter ore sizing method comprising classifying a sinter having a large particle size even under the predetermined particle size range under a sieve of the second screen.   The sinter ore sizing method according to claim 1 or 2, wherein a sintered ore having a particle size larger than a predetermined particle size range is crushed again and supplied to the classifier again. A swing type classifier for use in classifying the sintered ore, the first screen and the second screen and a series of upwardly inclined respectively having a larger mesh size than the first screen having a predetermined mesh size to be arranged in this order, oscillating movement of the first so as to reciprocate in the vertical direction and the inclined direction to exert the feeding of the inclined downwardly relative to sinter on the first screen and the second screen screen and includes an eccentric drive mechanism for causing the second screen, and sinter the mesh size smaller particle size of the first screen is larger than the mesh of the first screen, mesh size of the second screen and sintered ore of particle size less than, swinging classifier, characterized by classifying the second mesh size larger particle size of the screen sinter. A peristaltic classifier used for classification of sintered ore, a first screen having a predetermined mesh size, a third screen having a mesh size larger than the first screen, and a mesh larger than the third screen Second screens having dimensions are inclined and arranged in that order in series from above , and reciprocating in the vertical and inclined directions so as to feed the sintered ore on each screen downward in the inclination. the oscillating movement such that with an eccentric drive mechanism for causing each screen, and sinter the mesh size smaller particle size of the first screen is larger than the mesh of the first screen, the third screen mesh and sinter dimension smaller particle size, larger than the mesh of the third screen, and sinter the mesh size smaller particle size of the second screen, the second screen mesh Swing type classifier, characterized by classifying the sintered ore size larger particle size.

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