JPH0389953A - Dry grinding method - Google Patents

Abstract

PURPOSE:To enhance grinding efficiency by connecting a gas generation source having pressure higher than atmospheric pressure to a grinding tank and supplying the gas from the gas generation source into the grinding tank at the time of stirring due to a stirring member. CONSTITUTION:A material 25 to be ground and media 26 are charged in a grinding tank 4 and stirred by the stirring member 13 rotated by a drive source 9 and the material 25 to be ground are struck and ground between the media 26 to be finely pulverized. At this time, a gas generation source 17 having pressure higher than atmospheric pressure is connected to the grinding tank 4 and the gas from the gas generation source 17 is supplied into the grinding tank 4 at the time of the stirring due to the stirring member 13. As a result, the flow characteristic of the material 25 to be ground is enhanced and the stagnation thereof in the grinding tank 4 is prevented to perform uniform grinding and grinding efficiency can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a dry pulverization method, and particularly to a dry pulverization method for stirring pulverized material together with media to make it fine.

[Prior art and problems to be solved] Generally, crushed materials and media (for example, steel balls) are put into a crushing tank, and the materials are agitated by a stirring member and the crushed materials are crushed between the media to achieve fineness. In the dry pulverization method, the pulverized material is pinched between media and pulverized while grinding and gradually pulverized.

However, when the crushed material becomes fine as described above, its adhesion becomes strong and adheres to the inner peripheral wall of the crushing tank, the media, etc., and the crushed material becomes lumpy.
There was a problem in that the particles would stagnate, thereby hindering the grinding.

This invention solves the above-mentioned conventional problems and provides a dry pulverization method that improves the fluidity of the pulverized material, prevents it from stagnation in the pulverization tank, enables uniform pulverization, and increases the pulverization efficiency. The purpose is to provide

[Means to solve the problem]

In order to achieve the above object, the present invention introduces crushed material and media into a crushing tank, stirs them with a stirring member rotated by a drive source, and pinches the crushed materials between the media. A dry pulverization method in which a gas generation source having a pressure higher than atmospheric pressure is connected to the pulverization tank, and the gas from the gas generation source is pulverized during stirring by the stirring member. A method of supplying it into a tank was adopted.

[Effect]

By employing the above-mentioned means, this invention always applies a pressure higher than atmospheric pressure when stirring the crushed material and media by the stirring member, so that a sufficient amount of gas is supplied between the crushed materials. That is, the periphery of each granule comes into contact with the gas, thereby preventing adhesion between the granules and preventing the stagnation of the granules.

〔Example〕

FIG. 1 shows a dry grinding apparatus for carrying out the dry grinding method of the present invention.

This dry crushing device has a jacket plate 2 disposed on the peripheral wall of a cylindrical main body 1 with an open upper surface to close the upper and lower surfaces of the main body I and the jacket plate 2. It has a crushing tank 4 between which a Jaquent 3, which is a flow path, is formed.

Further, a tank cover 5 that can be opened and closed inside the main body 1 of the grinding tank 4 is attached to the top surface of the grinding tank 4, and this tank cover 5 is connected to a fixing part 6 provided on the circumferential surface of the grinding tank 4. The crushing tank 4 can be fixed with bolts 7.8, and the inside of the crushing tank 4 can be hermetically sealed.

On the other hand, in the center of the tank cover 5, there is a rotating shaft 10 which is rotated by a driving source 9 and is oriented in the vertical direction.
is rotatably arranged via a seal U' 11, and a plurality of stirring arms 12 are provided radially protruding horizontally from a portion of the rotating shaft 10 located inside the grinding tank 4, The rotating shaft 10 and the stirring arm 12 form a stirring member 13.

Further, the tank cover 5 is provided with a pressure gauge 15 for measuring the internal pressure of the crushing tank 4 via a pipe 14, and a supply nozzle 16 provided on the pipe 14 is provided with a pressure gauge 15 arranged externally. Gas supply source 17 is connected to valve 18.19
connected via.

Note that 20 is an inlet of the flow path, 21 is an outlet of the flow path, 22 is a sealing material between the crushing tank 4 and the tank cover 5, and 23 is a pressure gauge.

Next, the operation of the above will be explained.

First, the crushed material 25 and media 26 are put into the main body 1 of the crushing tank 4, and then the top surface of the crushing tank 4 is closed using the tank cover 5, and fixed with bolts and nuts 7.8. Then, the inside of the grinding tank 4 is sealed.

Then, the driving source 9 is started to start the stirring member 13 and the stirring of the crushed material 25 and the media 26 is started.

Then, each crushed material 25 is held between each media 26 and is struck and crushed into fine crushed materials, whose surface area increases and the gaps between the particles gradually become smaller to form a lump.

In this case, in the conventional method, it becomes difficult for the gas to penetrate inside the lumps, impairing fluidization, and the rotational force and centrifugal force of the stirring arm cause them to become even more lumpy, reducing the grinding efficiency. Put it away.

On the other hand, in this invention, the crushed material tank 4
Gas from gas supply #+17 to the inside of valve 18.1
9 and piping 14, and since the internal pressure of the crushing tank 4 is higher than the atmospheric pressure, the gas permeates into the inside of the lumpy crushed material that has been atomized by the stirring member 13 and the media 26. do.

In other words, when the periphery of each finely divided granule comes into contact with gas, adhesion between the granules becomes less likely to occur, and the granules become more fluid, thereby increasing the pulverization efficiency without causing stagnation. It will be enhanced.

Furthermore, if the temperature of the crushed material becomes high due to the crushing of the crushed material, the crushing efficiency decreases, but in this case, water for cooling may be introduced from the inlet port 20 into the jacket 3.
By flushing the inside of the crushing tank 4 and then letting it flow out from the outlet 21, the crushed material can be crushed without cooling the inside of the crushing tank 4 and reducing the crushing efficiency.

Therefore, according to the present invention, even when the pulverized material becomes fine, the gas sufficiently penetrates into the inside, so that the individual pulverized materials are prevented from forming into clumps. The fluidity of the crushed material is increased and stagnation of the crushed material is prevented, and therefore the crushing efficiency is significantly improved.

〔Effect of the invention〕

This invention introduces crushed material and media into a crushing tank, stirs them with a stirring member rotated by a drive source,
A dry pulverization method in which the pulverized material is pinched between the media and pulverized to make it fine, in which a gas generation source having a pressure higher than atmospheric pressure is connected to the pulverization tank, and during stirring by the stirring member, the Since the gas from the gas generation source is supplied into the crushing tank, the crushed material is agitated by the stirring member and pulverized between the media, and the gas from the gas generation source is between the individual crushed materials. Since the powder is supplied, it is possible to prevent adhesion between particles and prevent them from stagnation in the grinding tank, which has the unique effect of allowing good grinding to be carried out and significantly increasing the grinding efficiency.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing a dry crushing apparatus for carrying out the dry crushing method according to the present invention. 1...Body 2...Jacket plate 3...Jacket (channel) 4...Crushing tank 5...Tank cover 6... ...Fixing part 7.8...Bolt...Drive source O...Rotating shaft 1.22...Seal removal 2... ... Stirring arm 3 ... Stirring member 4 ... Piping 5.23 ... Pressure gauge 6 ... Supply nozzle 7 ... Gas supply source 8.19... Harz 0... Inlet 1... Outlet 5... Crushed material 6... Media

Claims (1)

[Claims] (1) Putting the crushed material and media into the crushing tank,
A dry pulverization method in which these are stirred by a stirring member rotated by a driving source, and the pulverized material is pinched between the media and pulverized into fine particles, and the pulverization tank is filled with a gas having a pressure higher than atmospheric pressure. A dry pulverization method, characterized in that a gas generation source is connected to the pulverization tank, and gas from the gas generation source is supplied into the pulverization tank during stirring by the stirring member.