WO2008088100A1 - Ball mill pulverization drum that use basalt - Google Patents

Ball mill pulverization drum that use basalt Download PDF

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Publication number
WO2008088100A1
WO2008088100A1 PCT/KR2007/000490 KR2007000490W WO2008088100A1 WO 2008088100 A1 WO2008088100 A1 WO 2008088100A1 KR 2007000490 W KR2007000490 W KR 2007000490W WO 2008088100 A1 WO2008088100 A1 WO 2008088100A1
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WO
WIPO (PCT)
Prior art keywords
drum
lining
pulverizing
ball
ball mill
Prior art date
Application number
PCT/KR2007/000490
Other languages
French (fr)
Inventor
Hee-Jong Youn
Jong-Do Kim
Original Assignee
Dongdo Basalt Ind.Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongdo Basalt Ind.Co., Ltd filed Critical Dongdo Basalt Ind.Co., Ltd
Publication of WO2008088100A1 publication Critical patent/WO2008088100A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/22—Lining for containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/24—Driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/0012—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/11—High-speed drum mills

Definitions

  • the present invention relates to a pulverizing drum of a ball mill using a basalt, and more particularly, to a pulverizing drum of a ball mill using a basalt, which can enhance a pulverization efficiency by increasing an impact load of an object to be pulverized and a ball received in the pulverizing drum of the ball mill, and extend the lifespan of the pulverizing drum by preventing a damage of a drum lining caused by friction and impact of the ball and the object.
  • a ball mill rotates an object to be pulverized, such as ores of uneven sizes, cement raw materials, coal, clinker, chemical industrial raw materials, drugs, foods, and so on, and a ball, which are put in a pulverizing drum, in order to collide the object and the ball and finely pulverize them.
  • object to be pulverized such as ores of uneven sizes, cement raw materials, coal, clinker, chemical industrial raw materials, drugs, foods, and so on
  • a ball which are put in a pulverizing drum, in order to collide the object and the ball and finely pulverize them.
  • a pulverizing performance of the ball mill according to how powers composed of gravity, centrifugal force and friction force acting to the object and the ball keep their balance.
  • the ball mill typically includes: a cylindrical hollow pulverizing drum, whose both ends are rotatably supported by a pair of supporting rods, the pulverizing drum being rotated by driving means; and a lining mounted inside the pulverizing drum and rotating together with the pulverizing drum in such a way that the object and the ball collide against each other.
  • the lining of the ball mill has a problem in that it is easily damaged and so the pulverizing drum is reduced in its lifespan when the object and the ball repeatedly collide against each other while the pulverizing drum rotates since the lining is mainly made of structure steel or alumina.
  • Korean Utility Model Registration No. 20-319,159 discloses a lining for a ball mill.
  • the lining is made of butadiene rubber, which has excellent abrasion resistance, and mounted on the inner surface of a ball mill drum, to thereby prevent an abrasion and a damage of the ball mill drum and reduce noise when a hard and bulky object, such as silica stone, is finely pulverized in the ceramic industrial field.
  • the ball mill lining can partially absorb impact of the object and ball, which is applied to the ball mill drum since it is made of the rubber material, but is deteriorated in pulverization performance since an impact load is reduced.
  • the ball mill lining has a difficulty in maintenance since the lining must be inspected on occasion due to a severe abrasion thereof and parts of the worn lining must be replaced individually.
  • the present invention has been made in an effort to solve the above- mentioned problems occurring in the prior arts, and it is an object of the present invention to provide a pulverizing drum of a ball mill using a basalt, which can greatly increase an impact load of a ball and an object to be pulverized in consideration of powers composed of gravity, centrifugal force and friction force acting to the object and the ball while the pulverizing drum of the ball mill rotates, and prevent that the object and the ball dropping in a parabolic orbit directly collide against a drum lining of the pulverizing drum, thereby improving a pulverization efficiency and preventing a damage of the drum lining.
  • the present invention provides a ball mill pulverizing drum using a basalt comprising: an outer case defining a contour of the pulverizing drum of the ball mill; a fixed case detachably mounted on the inner peripheral surface of the outer case through coupling means and having a receiving groove formed on a face thereof; and a drum lining securely received in the receiving groove of the fixed case together with mortar and made of a basalt material of a block unit, the drum lining including a concavo-convex part formed on the inner surface thereof and having convex portions and concave portions.
  • the coupling means includes coupling holes formed on the outer case corresponding to the fixed case and bolts coupled to the coupling holes.
  • the drum lining has an uneven type embedded protrusion formed on the face thereof bonded with the mortar.
  • the convex portion of the drum lining is inclined at an inclination angle ranging from 3 to 15 .
  • the inclination angle of the convex portion located on the front part of the pulverizing drum which has an inlet of the pulverizing drum adapted to put the object into the pulverizing drum, is smaller than an inclination angle of the convex portion located on the rear part of the pulverizing drum.
  • the pulverizing drum of the ball mill using a basalt according to the present invention can greatly increase the impact loads of the ball and the object to be pulverized in consideration of powers composed of gravity, centrifugal force and friction force acting to the object and the ball while the pulverizing drum rotates, whereby the pulverizing performance is enhanced.
  • the friction coefficient of the entire inside area of the pulverizing drum is kept uniformly so that the impact loads act uniformly, whereby the pulverizing efficiency of the object to be pulverized is enhanced.
  • the object and the ball dropping in the parabolic orbit do not directly collide against the lining of the pulverizing drum, whereby a concavo-convex part is not damaged.
  • FIG. 1 is a configurative view showing the entire structure of a pulverizing drum of a ball mill using a basalt according to the present invention.
  • FIG. 2 is a vertically sectional view showing the inside structure of the pulverizing drum, taken along the line of A-A of FIG. 1.
  • FIG. 3 is an enlarged configurative view of FIG. 1.
  • FIG. 4 is a schematic diagram of a drum lining to carry out an operation of a ball take-off angle of the drum lining according to the present invention.
  • FIG. 5 is a schematic diagram of the drum lining to indicate the orbit of motion of a ball.
  • FIG. 1 is a configurative view showing the entire structure of a pulverizing drum of a ball mill using a basalt according to the present invention
  • FIG. 2 is a vertically sectional view showing the inside structure of the pulverizing drum, taken along the line of A-A of FIG. 1
  • FIG. 3 is an enlarged configurative view of FIG. 1.
  • the present invention relates to a pulverizing drum of a ball mill using a basalt.
  • the pulverizing drum of the ball mill using a basalt includes an outer case 10, a fixed case 20, and a drum lining 30.
  • the outer case 10 defines an outward form of the pulverizing drum (D) of the ball mill, and is made of a metal material.
  • the outer case 10 is constructed of a hollow round steel pipe type, has an inlet formed at an end thereof for receiving an object (A) to be pulverized and a ball (B), and is rotated by driving means in a state where both ends thereof are supported by a supporting rod.
  • the fixed case 20 detachably mounted on the inner peripheral surface of the outer case 10 through coupling means 40, and has a receiving groove 22 formed on a face thereof.
  • the fixed case 20 is constructed of a metallic box type whose one face is opened, has the receiving groove 22 adapted to insert a portion of the drum lining 30, which will be described later, thereto, and is fixed by the coupling means 40 in a state where the fixed case 20 engages with the inner peripheral surface of the outer case 10.
  • the coupling means 40 includes coupling holes 10a formed on the outer case 10 corresponding to the fixed case 20 and bolts (T) coupled to the coupling holes 10a.
  • the coupling holes 10a and the bolts (T) are formed on at least two places, which are spaced apart from each other, in such a way that the fixed case 20 is mounted and firmly fixed to the outer case 10 without any movement.
  • the drum lining 30 is securely received in the receiving groove 22 of the fixed case 20 together with mortar 31 and made of a basalt material of a block unit, and includes a concavo-convex part 32 formed on the inner surface thereof and having convex portions 32a and concave portions 32b.
  • the drum lining 30 is made of the basalt material produced through the steps of melting and casting basalt, which is a sort of a volcanic rock, at high temperature, and carrying out a special heat treatment to crystallize the texture more closely.
  • the concavo-convex part 32 having the convex portions 32a and the concave portions 32b is formed integrally with a side of the drum lining 30 while the basalt melted at high temperature is cast.
  • the drum lining 30 is inserted and bonded to the fixed case 20 together with the mortar 31.
  • a clearance by right and left impact loads can be prevented since the drum lining 30 is bonded to the fixed case 20 in a state where a face of the drum lining 30 is inserted into the receiving groove 22 of a portion of the fixed case 20.
  • the drum lining 30 has an uneven type embedded protrusion 34 formed on the face thereof bonded with the mortar 31.
  • the uneven type embedded protrusion 34 is formed in a tooth form to extend a bonded area between the drum lining 30 and the mortar 31 and keep a bonding force of the bonded part firmly since the embedded protrusion 34 is bonded to the mortar 31 into a structure that it is embedded in the mortar 31.
  • the drum lining 30 continuously mounted on the inner peripheral surface of the outer case 10 through the fixed case 20 serves as a hopper to upwardly lift the object (A) to be pulverized and the ball (B) in a state where the object (A) and the ball (B) are received in the concave portion 32b formed between the convex portions 32a of the concavo-convex part 32 when the pulverizing drum (D) rotates.
  • the drum lining 30 drops in a parabolic orbit, and in this instance, the object (A) is finely pulverized by the impact load generated when the drum lining 30 drops.
  • the convex portion 32a of the drum lining 30 is inclined at an inclination angle ( ⁇ ) ranging from 3°to 15°.
  • ⁇ inclination angle
  • the inclination angle ( ⁇ ) of the convex portion 32a of the drum lining 30 is smaller than 3° since the object (A) and the ball (B) are lifted upwardly to a too high place, they collide against the drum lining 30 disposed in the opposite side and the concavo-convex part 32 is damaged when they drop. Furthermore, if the inclination angle ( ⁇ ) of the convex portion 32a of the drum lining 30 is larger than 15° since the object (A) and the ball (B) slidably drop in a state where they are not upwardly lifted to the fixed height, the great potential energy is not secured.
  • the inclination angle( ⁇ ) of the convex portion 32a located on the front part of the pulverizing drum (D), which has an inlet of the pulverizing drum (D) through which the object (A) is charged into the pulverizing drum (D), is smaller than an inclination angle( ⁇ ') of the convex portion 32a located on the rear part of the pulverizing drum (D).
  • the inclination angle( ⁇ ) of the convex portion 32a of the drum lining 30 mounted on the front area of the pulverizing drum (D), in which the friction coefficient is small, is smaller than the inclination angle( ⁇ ') of the convex portion 32a of the other area, whereby the pulverizing drum (D) can keep the friction coefficient in the entire inside area thereof uniformly to thereby enhance a pulverization performance.
  • a form of the drum lining 30 is determined in consideration of a take-off angle, a landing point of the ball (B), friction forces and impact forces of the object (A) to be pulverized, the ball (B) and the basalt, and so on. Referring to FIGS. 4 and 5, the above considerations will be described.
  • FIG. 4 is a schematic diagram of the drum lining to carry out an operation of a ball take-off angle of the drum lining according to the present invention
  • FIG. 5 is a schematic diagram of the drum lining to indicate the orbit of motion of the ball.
  • the take-off angle ( ⁇ ) means an angle formed between a straight line connecting take-off positions of the ball (B) from the center of the drum lining 30 and a horizontal axis of the drum lining 30 when the ball (B) is took off from the concave portion 32b after the ball (B) is lifted upwardly to the fixed height by the concave portion 32b of the drum lining 30 as the drum lining 30 rotates.
  • the take-off angle can be obtained through mathematical formulas 1 and 2.
  • [49] in the mathematical formula 1, is the inclination angle of the convex portion 32a of the concavo-convex part 32, mg is acceleration of gravity when mass of the ball (B) is m, r is a radius of the drum lining 30, w is acceleration of rotation of the drum lining 30, mrw is centrifugal force, mrw cos is an element parallel to an inclined face of the convex portion 32a, mrw sin is an element vertical to the inclined face, and is friction coefficient.
  • the ball (B) takes off from the drum lining 30 and starts a ballistic motion at a point of time when the powers acting to the ball (B) become 0.
  • the mathematical formula 1 is adjusted into the mathematical formula 2.
  • F is friction force.
  • the landing point of the ball is obtained when the ball performs the ballistic motion according to an orbit equation indicated in the following mathematical formula 3 after the ball (B) takes off from the concavo-convex part 32 at the take-off angle ( ⁇ ).
  • the mathematical formula 3 is indicated by the local coordinates system that a starting point of the ballistic motion of the ball (B), which takes off from the drum lining 30, becomes the origin.
  • (B) and the drum lining 30 ranges 0.5 to 2, and can be varied large or less according to a vibration of the drum lining 30.
  • the inclination angle of the convex portion 32a of the drum lining 30 is set to a range of 3 to 15°in consideration of the above-mentioned matters.

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  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

Disclosed therein is a pulverizing drum of a ball mill using a basalt. The pulverizing drum includes: an outer case (10) defining a contour of the pulverizing drum (D) of the ball mill; a fixed case (20) detachably mounted on the inner peripheral surface of the outer case (10) through coupling means (40) and having a receiving groove (22); and a drum lining (30) securely received in the receiving groove (22) of the fixed case (20) together with mortar (31) and made of a basalt material of a block unit, the drum lining including a concavo-convex part (32) formed on the inner surface thereof and having convex portions (32a) and concave portions (32b). The pulverizing drum can enhance a pulverization efficiency of the object to be pulverize since impact loads of the object and the ball are greatly increased and friction coefficient of the entire inside area of the pulverizing drum is kept uniformly so that the impact loads act uniformly, and prevent a damage of the concavo-convex part since the object and the ball dropping in a parabolic orbit do not directly collide against the drum lining.

Description

Description BALL MILL PULVERIZATION DRUM THAT USE BASALT
Technical Field
[1] The present invention relates to a pulverizing drum of a ball mill using a basalt, and more particularly, to a pulverizing drum of a ball mill using a basalt, which can enhance a pulverization efficiency by increasing an impact load of an object to be pulverized and a ball received in the pulverizing drum of the ball mill, and extend the lifespan of the pulverizing drum by preventing a damage of a drum lining caused by friction and impact of the ball and the object. Background Art
[2] In general, a ball mill rotates an object to be pulverized, such as ores of uneven sizes, cement raw materials, coal, clinker, chemical industrial raw materials, drugs, foods, and so on, and a ball, which are put in a pulverizing drum, in order to collide the object and the ball and finely pulverize them. In this instance, there is a wide difference in a pulverizing performance of the ball mill according to how powers composed of gravity, centrifugal force and friction force acting to the object and the ball keep their balance.
[3] Typically, the ball mill includes: a cylindrical hollow pulverizing drum, whose both ends are rotatably supported by a pair of supporting rods, the pulverizing drum being rotated by driving means; and a lining mounted inside the pulverizing drum and rotating together with the pulverizing drum in such a way that the object and the ball collide against each other. However, the lining of the ball mill has a problem in that it is easily damaged and so the pulverizing drum is reduced in its lifespan when the object and the ball repeatedly collide against each other while the pulverizing drum rotates since the lining is mainly made of structure steel or alumina.
[4] So, Korean Utility Model Registration No. 20-319,159 discloses a lining for a ball mill. In Korean Utility Model Registration No. 20-319,159, the lining is made of butadiene rubber, which has excellent abrasion resistance, and mounted on the inner surface of a ball mill drum, to thereby prevent an abrasion and a damage of the ball mill drum and reduce noise when a hard and bulky object, such as silica stone, is finely pulverized in the ceramic industrial field.
[5] However, the technology to provide the ball mill lining to reduce noise when the object is pulverized and extend the lifespan of the ball mill drum has several problems as follows.
[6] First, the ball mill lining can partially absorb impact of the object and ball, which is applied to the ball mill drum since it is made of the rubber material, but is deteriorated in pulverization performance since an impact load is reduced.
[7] Second, the ball mill lining has a difficulty in maintenance since the lining must be inspected on occasion due to a severe abrasion thereof and parts of the worn lining must be replaced individually.
[8] Third, since the lining is mounted on the inner surface of the drum in such a way as to simply protrude from the inner surface of the drum and produces friction between the object and the ball in a manner to simply mix them without consideration of balance of the powers composed of gravity, centrifugal force and friction force acting to the object and the ball while the pulverizing drum rotates, the lining is damaged severely. Furthermore, since time required for a complete pulverization lengthens, the lining is noticeably deteriorated in the pulverization efficiency. Disclosure of Invention Technical Problem
[9] Accordingly, the present invention has been made in an effort to solve the above- mentioned problems occurring in the prior arts, and it is an object of the present invention to provide a pulverizing drum of a ball mill using a basalt, which can greatly increase an impact load of a ball and an object to be pulverized in consideration of powers composed of gravity, centrifugal force and friction force acting to the object and the ball while the pulverizing drum of the ball mill rotates, and prevent that the object and the ball dropping in a parabolic orbit directly collide against a drum lining of the pulverizing drum, thereby improving a pulverization efficiency and preventing a damage of the drum lining. Technical Solution
[10] To achieve the above objects, the present invention provides a ball mill pulverizing drum using a basalt comprising: an outer case defining a contour of the pulverizing drum of the ball mill; a fixed case detachably mounted on the inner peripheral surface of the outer case through coupling means and having a receiving groove formed on a face thereof; and a drum lining securely received in the receiving groove of the fixed case together with mortar and made of a basalt material of a block unit, the drum lining including a concavo-convex part formed on the inner surface thereof and having convex portions and concave portions.
[11] In this instance, the coupling means includes coupling holes formed on the outer case corresponding to the fixed case and bolts coupled to the coupling holes.
[12] Furthermore, the drum lining has an uneven type embedded protrusion formed on the face thereof bonded with the mortar.
[13] Moreover, the convex portion of the drum lining is inclined at an inclination angle ranging from 3 to 15 . [14] In addition, in the drum lining, the inclination angle of the convex portion located on the front part of the pulverizing drum, which has an inlet of the pulverizing drum adapted to put the object into the pulverizing drum, is smaller than an inclination angle of the convex portion located on the rear part of the pulverizing drum.
Advantageous Effects
[15] As described above, the pulverizing drum of the ball mill using a basalt according to the present invention can greatly increase the impact loads of the ball and the object to be pulverized in consideration of powers composed of gravity, centrifugal force and friction force acting to the object and the ball while the pulverizing drum rotates, whereby the pulverizing performance is enhanced. [16] Moreover, the friction coefficient of the entire inside area of the pulverizing drum is kept uniformly so that the impact loads act uniformly, whereby the pulverizing efficiency of the object to be pulverized is enhanced. [17] Furthermore, the object and the ball dropping in the parabolic orbit do not directly collide against the lining of the pulverizing drum, whereby a concavo-convex part is not damaged.
Brief Description of the Drawings [18] FIG. 1 is a configurative view showing the entire structure of a pulverizing drum of a ball mill using a basalt according to the present invention. [19] FIG. 2 is a vertically sectional view showing the inside structure of the pulverizing drum, taken along the line of A-A of FIG. 1. [20] FIG. 3 is an enlarged configurative view of FIG. 1.
[21] FIG. 4 is a schematic diagram of a drum lining to carry out an operation of a ball take-off angle of the drum lining according to the present invention. [22] FIG. 5 is a schematic diagram of the drum lining to indicate the orbit of motion of a ball.
[23] *Explanation of essential reference numerals in drawings*
[24] 10: outer case 10a: coupling hole
[25] 20: fixed case 22: receiving groove
[26] 30: drum lining 31: mortar
[27] 32: concavo-convex part 32a: convex portion
[28] 32b: concave portion 34: embedded protrusion
[29] 40: coupling means
Mode for the Invention [30] Reference will be now made in detail to the preferred embodiment of the present invention with reference to the attached drawings. [31] FIG. 1 is a configurative view showing the entire structure of a pulverizing drum of a ball mill using a basalt according to the present invention, FIG. 2 is a vertically sectional view showing the inside structure of the pulverizing drum, taken along the line of A-A of FIG. 1, and FIG. 3 is an enlarged configurative view of FIG. 1.
[32] The present invention relates to a pulverizing drum of a ball mill using a basalt. In this instance, the pulverizing drum of the ball mill using a basalt, not illustrated in detail in the drawings, includes an outer case 10, a fixed case 20, and a drum lining 30.
[33] The outer case 10 defines an outward form of the pulverizing drum (D) of the ball mill, and is made of a metal material. The outer case 10 is constructed of a hollow round steel pipe type, has an inlet formed at an end thereof for receiving an object (A) to be pulverized and a ball (B), and is rotated by driving means in a state where both ends thereof are supported by a supporting rod.
[34] Furthermore, the fixed case 20 detachably mounted on the inner peripheral surface of the outer case 10 through coupling means 40, and has a receiving groove 22 formed on a face thereof. The fixed case 20 is constructed of a metallic box type whose one face is opened, has the receiving groove 22 adapted to insert a portion of the drum lining 30, which will be described later, thereto, and is fixed by the coupling means 40 in a state where the fixed case 20 engages with the inner peripheral surface of the outer case 10.
[35] In this instance, the coupling means 40 includes coupling holes 10a formed on the outer case 10 corresponding to the fixed case 20 and bolts (T) coupled to the coupling holes 10a. The coupling holes 10a and the bolts (T) are formed on at least two places, which are spaced apart from each other, in such a way that the fixed case 20 is mounted and firmly fixed to the outer case 10 without any movement.
[36] Moreover, the drum lining 30 is securely received in the receiving groove 22 of the fixed case 20 together with mortar 31 and made of a basalt material of a block unit, and includes a concavo-convex part 32 formed on the inner surface thereof and having convex portions 32a and concave portions 32b. The drum lining 30 is made of the basalt material produced through the steps of melting and casting basalt, which is a sort of a volcanic rock, at high temperature, and carrying out a special heat treatment to crystallize the texture more closely. In this instance, the concavo-convex part 32 having the convex portions 32a and the concave portions 32b is formed integrally with a side of the drum lining 30 while the basalt melted at high temperature is cast.
[37] In addition, the drum lining 30 is inserted and bonded to the fixed case 20 together with the mortar 31. In this instance, a clearance by right and left impact loads can be prevented since the drum lining 30 is bonded to the fixed case 20 in a state where a face of the drum lining 30 is inserted into the receiving groove 22 of a portion of the fixed case 20.
[38] Additionally, the drum lining 30 has an uneven type embedded protrusion 34 formed on the face thereof bonded with the mortar 31. As shown in FIGS. 1 and 2, the uneven type embedded protrusion 34 is formed in a tooth form to extend a bonded area between the drum lining 30 and the mortar 31 and keep a bonding force of the bonded part firmly since the embedded protrusion 34 is bonded to the mortar 31 into a structure that it is embedded in the mortar 31.
[39] As described above, the drum lining 30 continuously mounted on the inner peripheral surface of the outer case 10 through the fixed case 20 serves as a hopper to upwardly lift the object (A) to be pulverized and the ball (B) in a state where the object (A) and the ball (B) are received in the concave portion 32b formed between the convex portions 32a of the concavo-convex part 32 when the pulverizing drum (D) rotates. When the object (A) and the ball (B) are upwardly lifted to a fixed height through the concavo-convex part 32, the drum lining 30 drops in a parabolic orbit, and in this instance, the object (A) is finely pulverized by the impact load generated when the drum lining 30 drops.
[40] Here, the convex portion 32a of the drum lining 30 is inclined at an inclination angle (α) ranging from 3°to 15°. The reason is to prevent a damage of the concavo- convex part 32 of the drum lining due to an impact generated when the drum lining 30 drops while a great potential energy acts to the object (A) and the ball (B) in consideration of a balance of powers composed of gravity, centrifugal force and friction force acting when the drum lining 30 drops after upwardly lifting the object (A) and the ball (B).
[41] In more detail, if the inclination angle (α) of the convex portion 32a of the drum lining 30 is smaller than 3° since the object (A) and the ball (B) are lifted upwardly to a too high place, they collide against the drum lining 30 disposed in the opposite side and the concavo-convex part 32 is damaged when they drop. Furthermore, if the inclination angle (α) of the convex portion 32a of the drum lining 30 is larger than 15° since the object (A) and the ball (B) slidably drop in a state where they are not upwardly lifted to the fixed height, the great potential energy is not secured.
[42] Moreover, in the drum lining 30, the inclination angle(α) of the convex portion 32a located on the front part of the pulverizing drum (D), which has an inlet of the pulverizing drum (D) through which the object (A) is charged into the pulverizing drum (D), is smaller than an inclination angle(α') of the convex portion 32a located on the rear part of the pulverizing drum (D). Accordingly, while the friction coefficient acting when the object (A) and the ball (B) drop from the concavo-convex part 32 is reduced in the front part of the pulverizing drum (D) since powder of the object (A) put into the pulverizing drum (D) through the inlet is pushed backwardly and is in existence a little, the friction coefficient acting when the object (A) and the ball (B) drop is increased in the rear part of the pulverizing drum (D) because of the powder of the object (A) pushed from the front part of the pulverizing drum (D).
[43] As described above, since the friction coefficients of the drum lining 30, the object
(A) and the ball (B) acting in the front and rear areas of the pulverizing drum (D) are different from each other, as shown in FIG. 1, the inclination angle(α) of the convex portion 32a of the drum lining 30 mounted on the front area of the pulverizing drum (D), in which the friction coefficient is small, is smaller than the inclination angle(α') of the convex portion 32a of the other area, whereby the pulverizing drum (D) can keep the friction coefficient in the entire inside area thereof uniformly to thereby enhance a pulverization performance.
[44] A form of the drum lining 30 is determined in consideration of a take-off angle, a landing point of the ball (B), friction forces and impact forces of the object (A) to be pulverized, the ball (B) and the basalt, and so on. Referring to FIGS. 4 and 5, the above considerations will be described.
[45] FIG. 4 is a schematic diagram of the drum lining to carry out an operation of a ball take-off angle of the drum lining according to the present invention, and FIG. 5 is a schematic diagram of the drum lining to indicate the orbit of motion of the ball.
[46] First, the take-off angle (θ) means an angle formed between a straight line connecting take-off positions of the ball (B) from the center of the drum lining 30 and a horizontal axis of the drum lining 30 when the ball (B) is took off from the concave portion 32b after the ball (B) is lifted upwardly to the fixed height by the concave portion 32b of the drum lining 30 as the drum lining 30 rotates. The take-off angle can be obtained through mathematical formulas 1 and 2.
[47] MathFigure 1 mrω2cos a + μ( mgsin (τr/2 — a— Θ) + mrω2 sin a) — mgcos(π/2 — a— #)— 0
[48] MathFigure 2
2 sin (α+ Θ) — μcos (a+ θ) = rω ( cos a + μs\n ά)
[49] In the mathematical formula 1, is the inclination angle of the convex portion 32a of the concavo-convex part 32, mg is acceleration of gravity when mass of the ball (B) is m, r is a radius of the drum lining 30, w is acceleration of rotation of the drum lining 30, mrw is centrifugal force, mrw cos is an element parallel to an inclined face of the convex portion 32a, mrw sin is an element vertical to the inclined face, and is friction coefficient. As indicated in the mathematical formula 1, the ball (B) takes off from the drum lining 30 and starts a ballistic motion at a point of time when the powers acting to the ball (B) become 0. The mathematical formula 1 is adjusted into the mathematical formula 2. In FIG. 4, F is friction force.
[50] In the meantime, there may be no take-off angle (θ) satisfying the mathematical formula 2 in case where the centrifugal force is too large. However, such a case is not considered in the present invention. The take-off angle (θ) satisfying the mathematical formula 2 is computed through a computer program using the trial and error method.
[51] The landing point of the ball is obtained when the ball performs the ballistic motion according to an orbit equation indicated in the following mathematical formula 3 after the ball (B) takes off from the concavo-convex part 32 at the take-off angle (θ). The mathematical formula 3 is indicated by the local coordinates system that a starting point of the ballistic motion of the ball (B), which takes off from the drum lining 30, becomes the origin.
[52] MathFigure 3
Figure imgf000009_0001
[53] In the mathematical formula 3, V is the initial velocity when the ball (B) takes off from the drum lining 30, and V =rw.
[54] In order to obtain a point that the ball (B) collides against the object (A) to be pulverized in case where 1/3 of the drum lining 30 is filled with the object(A) using the mathematical formula 3, a surface layer of the object (A) filling the 1/3 of the drum lining 30 becomes an X-axis, and -rsinθ-(r/3) is substituted for y in the mathematical formula 3 to obtain the position of the dropping ball (B), and x satisfying the formula is obtain by carrying out an operation through the computer program using the trial and error method.
[55] Furthermore, the friction coefficient of basalt constituting the object (A), the ball
(B) and the drum lining 30 ranges 0.5 to 2, and can be varied large or less according to a vibration of the drum lining 30.
[56] In consideration of the above-mentioned matters, since the drum lining 30, 1/3 of which is filled with the object (A) to be pulverized, is inclined as indicated by a dotted line of FIG. 5 when the drum lining 30 rotates, if the landing point of the ball (B) is too far, the ball (B) does not collide against the object (A) but the inner peripheral surface of the drum lining 30. So, since only the drum lining 30 may be damaged, the landing point of the ball (B) must not be too far. Accordingly, you can guess that the landing point of the ball (B) must be within about 1/2 of the threshold value (X ), namely, a bnd point that the object (A) to be pulverized meets with the drum lining 30. [57] In consideration of the vibration of the drum lining, presuming that the friction coefficient of the rear part of the drum lining 30 is 0.9, as a result computed through the mathematical formulas 1 to 3, α=12° is right, and in this instance, the take-off angle (θ) of the ball (B) is 53.57° the greatest height (height from the X-axis) Y is 3.17m, max and the landing point x is 1.25m. In this instance, a diameter of the drum lining 30 is 5.2m, and the drum lining 30 rotates at 12.6rpm. [58] In the meantime, since the actual friction coefficient is positively changed according to a vibration level of the drum lining 30 and the landing point is increased when the friction coefficient is increased but is reduced when the friction coefficient is reduced, the inclination angle of the convex portion 32a of the drum lining 30 is set to a range of 3 to 15°in consideration of the above-mentioned matters.

Claims

Claims
[1] A pulverizing drum of a ball mill using a basalt comprising: an outer case (10) defining a contour of the pulverizing drum (D) of the ball mill; a fixed case (20) detachably mounted on the inner peripheral surface of the outer case (10) through coupling means (40) and having a receiving groove (22) formed on a face thereof; and a drum lining (30) securely received in the receiving groove (22) of the fixed case (20) together with mortar (31) and made of a basalt material of a block unit, the drum lining including a concavo-convex part (32) formed on the inner surface thereof and having convex portions (32a) and concave portions (32b).
[2] The pulverizing drum according to claim 1, wherein the coupling means (40) includes coupling holes (10a) formed on the outer case (10) corresponding to the fixed case (20) and bolts (T) coupled to the coupling holes (10a).
[3] The pulverizing drum according to claim 1, wherein the drum lining (30) has an uneven type embedded protrusion (34) formed on the face thereof bonded with the mortar (31).
[4] The pulverizing drum according to claim 1, wherein the convex portion (32a) of the drum lining (30) is inclined at an inclination angle (α) ranging from 3°to 15°
[5] The pulverizing drum according to claim 4, wherein in the drum lining (30), the inclination angle(α) of the convex portion (32a) located on the front part of the pulverizing drum (D), which has an inlet of the pulverizing drum (D) through which the object (A) is charged into the pulverizing drum (D), is smaller than an inclination angle(α') of the convex portion (32a) located on the rear part of the pulverizing drum (D).
PCT/KR2007/000490 2007-01-17 2007-01-29 Ball mill pulverization drum that use basalt WO2008088100A1 (en)

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CN101856633A (en) * 2010-06-01 2010-10-13 鞍钢集团矿业公司 Combined type ball mill lining plate
WO2014105068A1 (en) * 2012-12-28 2014-07-03 Suncoke Technology And Development Llc. Methods and systems for improved coke quenching
CN106238157A (en) * 2016-10-08 2016-12-21 贺州市创伟冶金耐材有限公司 The ball mill of a kind of refractory material and using method thereof
CZ307423B6 (en) * 2017-08-31 2018-08-08 Vysoká Škola Báňská -Technická Univerzita Ostrava A ball mill with a fluidization device

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KR100974378B1 (en) * 2009-07-01 2010-08-05 동도바잘트산업(주) Scale sluice way
CN102430455B (en) * 2011-10-26 2014-01-01 李姝霖 Manufacturing method of ball-milling tank capable of bearing high pressure and resisting abrasion,
CN114353436B (en) * 2022-01-20 2022-11-01 登封市汇联磨料磨具有限公司 High-temperature calcined sand raw material pretreatment method and matched integrated equipment

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN101856633A (en) * 2010-06-01 2010-10-13 鞍钢集团矿业公司 Combined type ball mill lining plate
WO2014105068A1 (en) * 2012-12-28 2014-07-03 Suncoke Technology And Development Llc. Methods and systems for improved coke quenching
CN106238157A (en) * 2016-10-08 2016-12-21 贺州市创伟冶金耐材有限公司 The ball mill of a kind of refractory material and using method thereof
CN106238157B (en) * 2016-10-08 2019-05-31 贺州市创伟冶金耐材有限公司 A kind of ball mill and its application method of refractory material
CZ307423B6 (en) * 2017-08-31 2018-08-08 Vysoká Škola Báňská -Technická Univerzita Ostrava A ball mill with a fluidization device

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