JPH0538464A - Slag crushing equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a slag crushing facility in which the iron particles in the raw material slag are efficiently extracted during crushing and are collected in a highly pure state, and the wear amount of the crushing part is reduced. [Structure] A slag crushing equipment including a vertical crusher 1, a bucket elevator 60, a magnet separator 70, an iron particle / slag powder separator 90, and a dust collector 110, wherein the iron particle / slag powder separator 90 is At least one inclined tube having an abrasion resistant material lined on its inner surface was provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulverizing equipment comprising a vertical pulverizer for pulverizing a raw material such as blast furnace slag by cooperation of a rotary table and a pulverizing roller, and particularly iron particles contained in the raw slag. The present invention relates to a crushing equipment for crushing while removing the slag.

[0002]

2. Description of the Related Art As a kind of crusher for finely crushing raw materials such as limestone, blast furnace slag, and cement raw material into powder,
As shown in FIG. 2, a vertical crusher 1 having a rotary table and a crushing roller is widely used. This type of crusher has a disk-shaped rotary table 3A which is driven by a motor 2A at a lower portion of a cylindrical casing 1a and rotates at a low speed at a lower portion of a cylindrical casing 1a, and a hydraulic pressure is applied to a portion which equally divides an outer peripheral portion of an upper surface thereof in a circumferential direction. And a plurality of crushing rollers 4 that are driven to rotate by being pressed against each other.

The crushing roller 4 is provided with a hydraulic cylinder 9 via a boss 5 and an arm 7 which are swingably supported by a shaft 6 of a bearing 8 mounted on the upper surface of a column base 20 arranged in the lower part of the casing 1a. Is connected to the piston rod 10 of
By operating the hydraulic cylinder 9, the crushing roller 4
Is pressed on the rotary table 3A to apply a crushing pressure to the raw material. 3B is a dam ring provided on the outer peripheral edge of the rotary table 3A for adjusting the raw material layer pressure, and 14 is a rotary table 3
An annular space passage for blowing gas around A, 14A is a gas duct, 15 is a casing, 13 is a rotary separator for classifying the raw material crushed by blades 13A, 16 is an outlet for taking out the product together with gas, and 17 is a raw material charging chute. is there.

In such a vertical crusher, the raw material supplied to the central portion of the rotary table 3A by the raw material chute 17 is subjected to centrifugal force in the radial direction of the table due to the rotation of the rotary table 3A, so that the raw material moves on the rotary table 3A. When sliding, it receives a force in the direction of rotation by the rotary table 3A and slides between itself and the rotary table 3A to perform rotation that is somewhat slower than the rotational speed of the rotary table 3A. The above two forces, that is, the force in the radial direction and the force in the rotation direction are combined, and the raw material moves to the outer peripheral portion of the rotary table 3A in a spiral trajectory on the rotary table 3A. A roller is pressed against the outer periphery of the crushing roller 4 to rotate, so that the raw material of which the spiral is drawn is the crushing roller 4.
Between the rotating table 3A and the rotary table 3A from a direction forming an angle with the roller axis direction, and is bitten and crushed.

On the other hand, a duct introduces air or gas such as hot air into the base of the casing 1a.
This gas is blown up from the annular space passage 14 between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing, so that the pulverized fine powder is entrained in the gas and the casing 1
blades 1 of the separator 13 located in the upper part of the separator 1
The product having a predetermined particle size is subjected to the classification action by 3A and is discharged together with the gas from the discharge port 16 and sent to the next step.

However, even if foreign matter such as iron pieces, bolts and nuts contained in the raw material overflows the rotary table 3A, the gravity overcomes the air flow rising in the annular space passage and the rotary table 3A remains in that state. The foreign matter is discharged from the foreign matter discharge port provided below. In addition, large particles in the raw material cannot fall into the ascending air flow and fall directly from the foreign matter discharge port. The falling particle size can be controlled by the continuity of the ascending airflow, that is, the air volume passing through the mill. In the case of slag crushing, iron particles having a diameter of 1 mm to 2 mm are mixed in the crushed product in a large amount, so the amount of air is comparatively reduced and particles having these particle sizes are also discharged from the foreign matter discharge port.

[0007]

When slag is crushed by a vertical crusher, coarse particles discharged from a foreign matter discharge port of the vertical crusher are passed to a vertical crusher via a bucket elevator outside the machine. It is recirculated with Newfeed slag and further crushed.
A lot of black spherical iron particles (mainly iron oxide) of about 2 mm are mixed, and the crushing part in the vertical crusher, that is,
Not only was the abrasion of the crushing rollers and table liner significantly progressed, but the amplitude value of the generated vibration during operation was large, which hindered stable operation.

On the other hand, the iron particles have a high purity and a small particle size, and the shape is almost spherical, and the particles are aligned, and by reusing them as steel balls for shot blasting, there is a particular demand in recent years. It's getting more and more. Therefore, how efficiently and efficiently these iron particles can be obtained from the slag powder, and
The important issue was how to take it out in a highly pure state.
However, slag powder adheres to the iron particles around the iron particles in the transportation system where these iron particles pass through the airtight (air seal) double damper installed in the foreign matter discharge port or the bucket elevator and the magnet separator. The weight ratio of the slag powder to the iron particles may be 50% to 50% at the time of being captured by the separator and discharged, and in order to use and sell it for shot blasting, fine slag powder from iron particles is again used. It is necessary to perform a separation process to remove
Not only is equipment and processes required for that purpose, but there are also disadvantages such as a low yield of sugla powder.

[0009]

In order to solve the above-mentioned problems, the slag crushing equipment of the present invention is provided with a plurality of rotatable crushing rollers on the upper surface of the outer periphery of the rotary table, and the crushing rollers are provided on the rotary table. It is equipped with a hydraulic cylinder that presses the slag and other raw materials that have been supplied onto the rotary table via the raw material charging chute, and applies a predetermined pulverizing pressure to the pulverizing roller to pulverize between the upper surface of the rotating table and the peripheral surface of the pulverizing roller. A vertical crusher that discharges the fine powder classified by the classifier above the vertical crusher by air transfer, a bucket elevator that vertically transports the coarse particles discharged by overflowing the rotary table of the vertical crusher, and a bucket It was installed in the middle of the magnet separator installed directly under the elevator discharge port and the vertical pipe that discharges the iron particles contained in the slag collected and discharged by the magnet separator. What is claimed is: 1. A slag crushing facility including a grain / slag powder separator, and a dust collector that collects the fine powder of the vertical crusher and the fine powder in the vertical pipe, wherein the iron grain / slag powder separator has an inner surface. A wear resistant material is lined inside and at least one inclined pipe is provided.

[0010]

In the crushing equipment of the present invention, the slag of the raw material hopper is supplied to the vertical crusher through the constant feed wear, crushed and classified by the separator at the top of the mill, and the fine powder is conveyed by air to collect the dust. Will be collected at. On the other hand, iron particles that are not crushed on the rotating table are transported vertically along with coarse particles through a foreign matter discharge port under the rotating table and a double damper in a bucket elevator, and then only the iron particles are magnetically separated from the raw slag by a magnet separator. Then, the vertical pipe falls down. At this time, the slag powder around the iron particles was separated from the iron particles by using the falling impact force of the iron particle / slag powder separator installed in the middle of the vertical pipe, and the separator and dust collector were connected. Only the fine slag powder is collected in the dust collector by the suction force of the fan through the pipe. On the other hand, the coarse particles of the slag from which the iron particles have been removed by the magnet separator are again supplied to the vertical crusher by a transportation means such as a belt conveyor and crushed.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 show an embodiment according to the present invention, FIG. 1 is an overall flow sheet of a slag crushing equipment, FIG. 2 is a longitudinal sectional view of an iron particle / slag powder separator, and FIG. 3 is an iron particle / slag powder separator. It is a side view showing other examples of a machine. In the figure, 1 is a vertical crusher, 30 is a raw material hopper, 40 is constant feed wear, and 50 is a double damper that operates so that when one is open, the other is closed. It is configured so that solid particulate matter can be discharged while preventing the intrusion of dust. Reference numeral 60 is a bucket elevator, 70 is a magnetic separator, 80 is a vertical tube, 90 is an iron particle / slag powder separator, 100 is a belt conveyor, 110 is a dust collector, and 120 is a suction fan. Since the structure of the vertical crusher 1 is the same as that described in the conventional art, the description thereof is omitted.

The iron particle / slag powder separator 90 has a function of separating and removing the slag powder adhering to the periphery of the iron particles from the iron particles, and its structure is as shown in FIG. 80
In the middle of the above, at least one inclined pipe, which is installed mainly below the ground and whose inner surface is coated with a wear-resistant lining material 90a, is provided, and a vertical pipe is connected to this inclined pipe. The iron particles falling into the iron particle / slag powder separator 90 while maintaining a drop of several meters or more strongly hit the lining material 90a of the inclined pipe and are severely refracted as shown by the arrow in FIG. The iron particles / slag powder separator 90 is repeatedly passed. At this time, the slag powder on the surface of the iron particles separated by the impact when it abuts the lining material 90a is delivered to the dust collector 110 along with the air sucked by the suction pipe 90b. As shown in FIG. 3, a square pipe is used instead of the circular pipe, and the lining material 90c of SUS steel plate is slidable along the slope of the inclined pipe.
0d may be vertical.

The operation of the slag crushing equipment of the present invention thus constructed will be described. The raw material slag of the raw material hopper 30 is supplied in a constant amount by the constant feed wear 40 and is supplied into the vertical crusher 1. The supplied raw material slag is crushed by the interaction between the rotary table 3A and the crushing roller 4, the fine powder is classified by the separator 13 at the top, and the refined powder after classification is collected by the dust collector 110 from the outlet through the pipe. Collected and made into a product (slag powder). on the other hand,
The iron particles on the rotary table 3A of the vertical crusher 1 are discharged from the foreign matter discharge port together with the coarse particles of slag (those having a relatively large diameter), and pass through the double damper 50 and the bucket elevator 60 to the bucket elevator 60. It enters the magnet separator 70 disposed immediately below the discharge port, is magnetically sorted and separated into slag coarse particles and iron particles, and the slag coarse particles are re-supplied to the vertical crusher 1 via the belt conveyor 100. It The iron particles fall into the vertical tube 80, the slag powder on the surface of the iron particles is separated by the iron particle / slag powder separator 90 installed at the lower part of the vertical tube 80, and the iron particles are conveyed to the dust collector 110 by air, while the iron particles are ironed. The particles are discharged from a pipe below the iron particle / slag powder separator 90.

The iron particles obtained in this manner are spherical particles of high purity with slag powder on the surface almost removed, and have a diameter of 1 to 2 m.
It is sized to about m and is highly useful as a steel ball for shot blasting. On the other hand, iron particles are mostly removed from the recycled slag coarse particles (purity: 90%), and the severe wear caused by the iron particles contained in the slag, which is often found in the past, can be almost eliminated. Further, since the slag powder which iron particles have conventionally carried away can be recovered by the facility of the present invention, the yield is improved by 20 to 30%.

[0015]

As described above, the slag crushing equipment of the present invention has extremely high purity from the raw material slag, and
Circular sized iron particles can be efficiently recovered with simple equipment, and wear of the vertical crusher can be reduced,
In addition, the yield of slag powder can be improved.

[Brief description of drawings]

FIG. 1 is an overall flow sheet showing an example of slag crushing equipment of the present invention.

FIG. 2 is a longitudinal sectional view showing an embodiment of an iron particle / slag powder separator of the slag crushing equipment of the present invention.

FIG. 3 is a side view showing another embodiment of the iron particle / slag powder separator of the slag crushing equipment of the present invention.

FIG. 4 is an overall vertical sectional view of a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical Grinder 3A Rotary Table 4 Grinding Roller 30 Raw Material Hopper 40 Constant Feed Wear 50 Double Damper 60 Bucket Elevator 70 Magnet Separator 80 Vertical Pipe 90 Iron Grain / Slag Powder Separator 90a Lining Material 90b Suction Pipe 90c Lining Material 90d Suction pipe 100 Belt conveyor 110 Dust collector 120 Suction fan

Claims (1)

[Claims] 1. A rotary table is provided with a plurality of rotatable crushing rollers on an upper surface of an outer peripheral portion of the rotary table, and a hydraulic cylinder for pressing the crushing rollers against the rotary table is provided. The supplied raw materials such as slag are crushed between the upper surface of the rotary table and the peripheral surface of the crushing roller by applying a predetermined crushing pressure to the crushing roller, and the fine powder classified by the classifier above the vertical crusher is discharged by air transportation. Vertical crusher, bucket elevator that vertically transports the coarse particles discharged by overflowing the rotary table of the vertical crusher, magnet separator provided directly below the outlet of the bucket elevator, and collected by the magnetic separator An iron particle / slag powder separator installed in the middle of a vertical pipe that discharges iron particles contained in the discharged slag, a fine powder of the vertical crusher, and a fine powder in the vertical pipe. A slag crushing device including a dust collector for collecting powder, wherein the iron particle / slag powder separator is a slag having an inner surface lined with an abrasion resistant material and provided with at least one or more inclined pipes. Crushing equipment.