JP5124962B2 - Sintered ore crushing apparatus and sintered ore sizing method using the same - Google Patents

Description

  The present invention relates to a crushing apparatus used when adjusting the particle size to a sintered ore having an appropriate particle size as a blast furnace raw material by crushing and classifying the fired sintered ore, and a sintered ore using the crushing apparatus It relates to the sizing method.

  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 the first stage sieve 6 having a screen of about 100 mm. The massive sintered ore exceeding 100 mm that has been sieved on the sieve by the first stage sieve 6 is supplied to the secondary crusher 5 and crushed with a target of 50 mm or less. The sintered ore crushed by the secondary crusher 5 merges with the lower sieve of the first stage sieve 6 and is supplied to the second stage sieve 7. Then, the second stage sieve (15 mm mesh) 7, the third stage sieve (8 mm mesh) 8, the fourth stage sieve (5 mm mesh screen) 9, and the screen mesh are made smaller in order, and the appropriate particle size as a blast furnace raw material The sintered ore is sieved. That is, the sintered ore having a particle size of 15 to 50 mm, which is sieved on the sieve by the second stage sieve 7, is supplied as a product to the blast furnace 10, and the sieve below the second stage sieve 7 is supplied to the third stage sieve 8. The The sintered ore having a particle size of 8 to 15 mm, which has been sieved on the sieve by the third stage sieve 8, is supplied to the sintering machine 1 as the floor sinter of the sintering machine, and the sieve below the third stage sieve 8 is the fourth stage sieve. 9 is supplied. The sintered ore having a particle size of 5 to 8 mm, which has been sieved on the sieve by the fourth-stage sieve 9, is supplied as a product to the blast furnace 10, and the sintered ore having a particle size of 5 mm or less which has been sieved under the sieve of the fourth-stage sieve 9 The ore (pulverized ore) is returned again to the sintering machine 1 as a sintering raw material.

  And as the primary crusher 2, a single spike roll type crusher in which a claw-like crusher called a demon tooth is provided on a single roll is usually used. As the secondary crusher 5, a horizontal direction is used. A double roll type crusher in which teeth are provided on two rolls facing each other is used (for example, see Patent Document 1).

Moreover, for each of the first-stage sieve 6 to the fourth-stage sieve 9, a vibrating sieve having an amplitude of several mm is used.
JP-A-6-15189

  Generally, in the double roll type secondary crusher 5, as shown in a perspective view in FIG. 8, the width Wr of the two opposing rolls 5a and 5b is about 1.5 m, The width Wc of the conveyor 19 that conveys the sintered ore screened on the sieve by the first stage sieve 6 is as narrow as about 0.5 m, and the conveyor belt is often V-shaped.

  Therefore, when the sintered ore is put into the gap between the two rolls 5a and 5b from the transport conveyor 19, it is thrown into only a part of the rolls 5a and 5b in the width direction, and only a part of the width of the rolls 5a and 5b. Since the sinter is crushed using, the crushing efficiency does not increase. Therefore, the overall sizing efficiency is not increased.

  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 sinter having an appropriate particle size as a blast furnace raw material, An object of the present invention is to provide a crushing apparatus capable of efficiently crushing, and a sinter ore sizing method using the crushing apparatus.

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

[1] A crushing device used when adjusting the particle size of the sintered sinter into a sintered ore having a predetermined particle size range, wherein the conveyed sintered ore is dispersed in the width direction of the crushing device body. A dispersion charging mechanism for charging into the crushing device main body is provided. The dispersion charging mechanism includes a buffer plate and a dispersion plate, and the buffer plate drops the sintered ore from a conveyer that conveys the sintered ore. Located on the line, the plate width direction is parallel to the width direction of the crushing device body and is inclined at a predetermined angle θ1 with respect to the horizontal plane, the dispersion plate has an upper end connected to the lower end of the buffer plate, The lower end is located above the crushing device body, the plate width direction is parallel to the width direction of the crushing device body, and is inclined at a predetermined angle θ2 (where θ1> θ2) with respect to the horizontal plane, The sintered ore dropped from the conveyor is received by the buffer plate and (A) After eliminating the velocity component in the conveying direction and lowering the falling speed to the crushing device body, the sintered ore sliding down on the buffer plate disperses the dispersion plate in the width direction of the crushing device body. The sintered ore crushing apparatus is characterized in that it slides down while being distributed and introduced into the crushing apparatus main body from its lower end .

  [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 ore that has been fired, Secondary pulverization using the crushing apparatus according to the above [1], and a sinter ore sizing method.

  [3] When classifying the secondary crushed sintered ore, classification is performed using a classifier having a plurality of screens having different sieve dimensions. The sizing method.

  In this invention, since the dispersion | distribution injection | throwing-in mechanism for disperse | distributing and throwing a sintered ore into a crushing device main body is provided, a sintered ore can be efficiently crushed using the whole crushing device main body. This also makes it possible to efficiently size the sintered ore.

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

(First embodiment)
FIG. 1 is a processing flow diagram according to the first embodiment of the present invention, and FIG. 2 is an explanatory diagram of a crushing apparatus (secondary crusher) used in the first embodiment of the present invention.

  As shown in FIG. 1, in this embodiment, the sintered ore fired on the 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 sieved by the first stage sieve 6 having a screen of about 100 mm. The massive sintered ore over 100 mm that has been sieved on the sieve by the first stage sieve 6 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 6 and is supplied to the second stage sieve 7. Then, the second stage sieve (15 mm mesh) 7, the third stage sieve (8 mm mesh) 8, the fourth stage sieve (5 mm mesh screen) 9, and the screen mesh are made smaller in order, and the appropriate particle size as a blast furnace raw material The sintered ore is sieved. That is, the sintered ore having a particle size of 15 to 50 mm, which is sieved on the sieve by the second stage sieve 7, is supplied as a product to the blast furnace 10, and the sieve below the second stage sieve 7 is supplied to the third stage sieve 8. The The sintered ore having a particle size of 8 to 15 mm, which has been sieved on the sieve by the third stage sieve 8, is supplied to the sintering machine 1 as the floor sinter of the sintering machine, and the sieve below the third stage sieve 8 is the fourth stage sieve. 9 is supplied. The sintered ore having a particle size of 5 to 8 mm, which has been sieved on the sieve by the fourth-stage sieve 9, is supplied as a product to the blast furnace 10, and the sintered ore having a particle size of 5 mm or less which has been sieved under the sieve of the fourth-stage sieve 9 The ore (pulverized ore) is returned again to the sintering machine 1 as a sintering raw material.

  And the secondary crusher 4 used in this embodiment is a double roll type crushing mechanism (crusher) having two rolls 4a and 4b facing in the horizontal direction as shown in a perspective view in FIG. Main body) and the sintered ore dropped from the conveyer 19 are dispersed in the gap (roll gap) between the two rolls 4a and 4b in the roll width direction, and the conveyer 19 and the rolls 4a and 4b And a dispersion charging mechanism 11 disposed at an intermediate height position.

  For example, as shown in FIGS. 2 and 3, the dispersion charging mechanism 11 includes a buffer plate 11a and a dispersion plate 11b. The buffer plate 11a is located on the drop line of the sintered ore from the transport conveyor 19, the plate width direction is parallel to the roll width direction, and is inclined at a predetermined angle θ1 with respect to the horizontal plane. The dispersion plate 11b has an upper end connected to the lower end of the buffer plate 11a, a lower end located above the roll gap, a plate width direction parallel to the roll width direction, and a predetermined angle θ2 (however, It is inclined at θ1> θ2). The plate width Wp of the buffer plate 11a and the dispersion plate 11b is substantially the same as the roll width Wr.

  In such a dispersion charging mechanism 11, first, the sintered ore dropped from the conveyer 19 is received by the buffer plate 11 a to eliminate the speed component in the conveyer conveying direction and reduce the falling speed to the roll gap. The sintered ore that has slid down on the buffer plate 11a slides down while being dispersed in the plate width direction (roll width direction) on the dispersion plate 11b, and is guided to the dispersion plate 11b. To the gap between the rolls in a roll width direction.

  Thus, in this embodiment, since the secondary crushing is performed by the secondary crusher 4 provided with the dispersion charging mechanism 11, the sintered ore is appropriately guided to the roll gap while being dispersed in the roll width direction. Thus, the sintered ore can be efficiently crushed using the entire roll width of the secondary crusher 4. This also makes it possible to efficiently size the sintered ore.

  As shown in FIG. 4 (a), as the dispersion charging mechanism 11, a branch wedge 11c is provided on the dispersion plate 11b, or as shown in FIG. 4 (b), a branch wedge 11d is provided on the dispersion plate 11b. 11e may be provided to form a flow path dispersion structure.

(Second Embodiment)
FIG. 5 is a process flow diagram according to the second embodiment of the present invention, and FIG. 6 is an explanatory diagram of an oscillating classifier used in the second embodiment of the present invention.

  As shown in FIG. 5, in this embodiment, 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 to be crushed with a target of 50 mm or less. The sintered ore crushed by the secondary crusher 4 is supplied to the swing classifier 20. The oscillating classifier 20 includes three types of inclined screens in the order of the first screen (screen 5 mm) 21, the second screen (screen 8 mm) 22, and the third screen (screen 15 mm). Accordingly, sintered ore having a suitable particle size as a blast furnace raw material is screened. That is, the sintered ore having a particle size of 5 mm or less (pulverized ore) sieved under the sieve of the first screen 21 is returned again to the sintering machine 1 as a sintering raw material, and is passed under the sieve of the second screen 22. Sintered sinter having a particle size of 5 to 8 mm is supplied as a product to the blast furnace 10, and a sintered ore having a particle size of 8 to 15 mm that has been sieved under the screen of the third screen 23 is used as a sinter flooring ore. The sintered ore having a particle size of 15 to 50 mm, which is supplied to the sintering machine 1 and sieved on the sieve of the third screen 23, is supplied to the blast furnace 10 as a product.

  Here, the secondary crusher 4 used in this embodiment is the same as the secondary crusher 4 used in the first embodiment described above. As shown in the perspective view of FIG. A double roll type crushing mechanism (crusher main body) having two rolls 4a and 4b facing each other, and a sintered ore dropped from the conveyor 19 between the two rolls 4a and 4b (roll gap). ) In the roll width direction, and is provided with a dispersion charging mechanism 11 disposed at a height intermediate between the transport conveyor 19 and the rolls 4a and 4b.

  As described above, the oscillating classifier 20 used in this embodiment is, as shown in FIG. 6, a first screen (sieving mesh 5 mm) inclined in the chamber 25 and arranged in series from above. ) 21, a second screen (sieving 8 mm) 22, a third screen (sieving 15 mm), and three different screens. The screens 21 to 23 are reciprocated in the vertical direction and the tilt direction so that the eccentric drive mechanism 17 such as a crank mechanism or a planetary gear feeds the sintered ore on the respective screens to the tilt downward direction. The rocking motion is performed. As a result, the amplitude can be increased compared with the existing vibrating screen, and the repulsive force can be applied to the sintered ore for classification. Since it can classify | categorize into a chemical ore, favorable classification efficiency can be obtained.

  In this oscillating classifier 20 as well, the sinter ore transported from the oscillating classifier 20 by the transport conveyor 29 is dispersed and introduced in the width direction of the screen, so A dispersion input mechanism 27 is provided between the screens 21.

  Thus, in this embodiment, since the secondary crushing is performed by the secondary crusher 4 provided with the dispersion charging mechanism 11, the sintered ore is appropriately guided to the roll gap while being dispersed in the roll width direction. Since the sinter can be efficiently crushed using the entire roll width of the secondary crusher 4 and is classified by the swing classifier 20, In addition, it is possible to classify the product into a product, a floor bedding mine, and a pulverized ore. Therefore, it is possible to efficiently size the sintered ore.

It is a processing flow figure in a 1st embodiment of the present invention. It is explanatory drawing of the secondary crusher used in the 1st Embodiment of this invention. It is explanatory drawing of the dispersion | distribution injection | throwing-in mechanism used in embodiment of this invention. It is explanatory drawing of the other dispersion input mechanism used in embodiment of this invention. It is a processing flowchart in the 2nd Embodiment of this invention. It is explanatory drawing of the rocking classifier used in the 2nd Embodiment of this invention. It is a processing flow figure in a prior art. It is explanatory drawing of the secondary crusher in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sintering machine 2 Primary crusher 3 Cooling machine 4 Secondary crusher 4a, 4b Roll of secondary crusher 5 Secondary crusher 5a, 5b Roll of secondary crusher 6 First stage sieve 7 Second stage sieve 8 Third stage sieve 9 Fourth stage sieve 10 Blast furnace 11 Dispersion charging mechanism 11a Buffer plate 11b Dispersion plate 11c, 11d, 11e Branch wedge 16 Conveyor 20 Oscillating classifier 21 First screen 22 Second screen 23 Third screen 24 Eccentric drive mechanism 25 Case 27 Dispersion input plate 29 Conveyor

Claims (3)

A crushing device used for adjusting the particle size of sintered sinter into a sintered ore having a predetermined particle size range, wherein the sinter that has been transported is dispersed in the width direction of the crushing device body, and the crushing device body distributed turned includes a mechanism, the dispersion input mechanism for inputting the is provided with a buffer plate and the distribution plate, the buffer plate is located in dropping line of sintered ore from conveyor for conveying the sinter The plate width direction is parallel to the width direction of the crushing device body and is inclined at a predetermined angle θ1 with respect to the horizontal plane, and the dispersion plate has an upper end connected to a lower end of the buffer plate and a lower end of the dispersion plate. Located above the crusher body, the plate width direction is parallel to the width direction of the crusher body, and is inclined at a predetermined angle θ2 (where θ1> θ2) with respect to the horizontal plane, The dropped sintered ore is received by the buffer plate and conveyed by the conveyor. After eliminating the velocity component in the direction and lowering the falling speed to the crushing device body, the sintered ore that slides down on the buffer plate slides while dispersing on the dispersion plate in the width direction of the crushing device body. A sintered ore crushing apparatus , which falls and is distributed and introduced into the crushing apparatus main body from the lower end thereof .   The method according to claim 1, wherein the sintered ore is coarsely crushed in a method for regulating the particle size of the sintered ore to adjust the particle size to a sintered ore having a predetermined particle size range by crushing and classifying the fired sintered ore. A method for sintering ore sizing, characterized by performing secondary crushing using the crushing apparatus described in 1.   3. The method according to claim 2, wherein classification is performed using a classification device having a plurality of screens having different sieve sizes when classifying the secondary crushed sintered ore.

Images