JPS6022946A - Apparatus for grinding brittle material to be ground - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

INDUSTRIAL FIELD OF APPLICATION The invention comprises a rotary tube mill for comminuting materials to a product fineness, e.g. for grinding brittle materials such as cement clinker, ores, coal or the like. Regarding the device. Conventional techniques The grinding and comminution of cement clinker, like that of some other brittle materials, involves large energy consumption. For cement clinker, this averages out to about 40 kilowatt-hours per ton. Since the total amount of energy consumption is large, the energy cost for grinding and pulverizing cement clinker into cement has a decisive influence on the cost of cement production. In fact, cement pulverization was carried out in tube mills and ball mills filled with pulverized bodies of Kanasu balls or similar materials in the royal palace, and these mills had good pulverization efficiency and were able to pulverize cement tarinka blocks to a cement fineness. However, its efficiency is extremely low compared to single particle grinding, at most about 9%. That is, the specific energy consumption of those mills is large. Therefore, in the past, various treatments have been used to increase energy utilization. For example, a pulverization auxiliary means is added to suppress the formation of lumps of material during pulverization. Known processes for reducing specific energy consumption during milling seemed to be fairly complete. In other words, it can be said that without the development of new pulverization technology, it is hardly possible to definitively improve conventional pulverization equipment in terms of energy consumption in the future. Problems to be Solved by the Invention Therefore, the basic problem of the present invention is to solve the problem of pulverization in the case of an apparatus for pulverization or pulverization using an existing tube mill or also in the case of an apparatus for pulverization using a new tube mill. Sometimes the goal is to take new and simple measures that can keep the specific energy demand low and increase product efficiency. Means for Solving the Problem This problem is solved by the device of the invention, which is characterized by the features set forth in claims 1) to '7). Function and Effect In a tube mill having at least two pulverizing chambers, the pulverizing body, which is usually a metal ball, is omitted in the case of an O-type pulverizing chamber when viewed in the flow direction of the material to be pulverized, and the first pulverizing chamber is The material to be pulverized is pulverized as it is, and the lump of material to be pulverized is ＼
By means of the inventive procedure of crushing and disintegration, the mass of the pulverized mass is reduced, and a distinct reduction in the power consumption of the tube mill, and thus also in the specific energy demand, is achieved, especially in tube mills. The material to be pulverized has been pre-processed in a traditional compression crushing unit, and is suitable for use in warfare with comparatively little energy.
Imitation crushing to completely crush or disintegrate; (Achieved when composed of a mass of words. Slightly wa) ii! !・
The grains are crushed as they are, and after being disintegrated, the product is crushed into fine particles in at least one pulverizing chamber of a tube mill equipped with a pulverizing body.
Finely grind to 11J degree. According to the special award 'I of this invention, a J4 raised portion 4'A' % on the inner wall of the pulverizing chamber of a tube mill without a pulverizing body]...
It is likened to if/water means or something similar. The respective parts 4J are constructed as follows. Ijl
- To ensure that the rotation of the pulverized part and the simultaneous 4-fan feeding are stable (therefore, the tube mill does not need to be supported at an angle and can be installed horizontally. As already described, , V) Crushing or dismantling of the raw material to be pulverized can be carried out by connecting a roll wiping or roll mill operated with a pressing force of 2 tons or more per centimeter of roll, in order to increase product efficiency. In some cases, it is possible to minimize energy costs. Cut the mass like a press surpe or similar into a tube mill.
The material to be pulverized is placed in the pulverization chamber. Embodiment 1 A detailed description will be given based on the drawings showing the embodiment. The figure shows a device for comminution of brittle materials U, such as, for example, cement clinker, ore, coal or the like. This equipment has a packet elevator type rotary pulverizing device, for example, a two-tube mill 10 with a diameter of 2.2 meters and a length of 14 meters and a cyclone circulating air mill.
It is composed of a separate machine 11. Roll mills 12 and 13 or a roll mill driven by a strong pressing force of 2 tons or more per 1 cm of roll length are connected in advance to the tube mill 0 according to the principle of single particle crushing and/or material bed crushing. A packet elevator (not shown) is provided between the two-roll crusher and the tube mill, and between the tube mill and the sieve machine. Roll mill 1 connected to tube mill 10
Cement clinker 1 which is not pre-pulverized in 2,13
4 is milled according to the combined method of single particle milling and material bed milling. For example, the particle size of the majority of the particles 14 to be crushed is 1
00 mm is larger than the width of the roll gap between rolls 12 and 13, which is, for example, 20 mm. The roll may have a width of 250 mm, for example, and a seam diameter of 900 mm. of

[
・) In the case of feather bed crushing in which the material 14 passes through a narrow roll gap, the material 14 to be crushed is then fed into the roll gap in a manner such that it is placed on the ground. The phase of the moon drawn between the rolls pulls the rolls toward each other, and the particles of the material to be crushed pile up or aggregate in the gaps between the rolls, or crush each other in the yield bed. Density is 1600 per meter
becomes a kilogram. The pressure in the hydraulic system of the roll mill 12.13 amounts to approximately 50-70 bar. This is a roll of Ill centimeters! 116.5)
-Equivalent to 8.6 tons of roll press K -J-;E,
. The roll orbit speed is 1 per second compared to a normal roll mill which is driven with a roll orbit speed of about 6 meters per second.
．． 5 meters, special KO63 - 1.2 meters slower. The relatively low orbital speed of the roll mills 12, 13 facilitates the drawing in of particles, especially during material bed comminution, and also keeps the dynamic loads on the roller bearings low. The roll surface is shaped by a V-shaped welding die. Cement clinker is crushed and comes out from the nip between the rolls and partially clumps. i.e. compressed 9240 per cubic meter
This results in a Schulpe with a density of 0 kilograms. The cement clinker mass 15 is fed into the first pulverizing chamber 16 of the Tunip mill 100, viewed in the direction of flow of the pulverized material. The roll mill can also be arranged horizontally on an inclined support. There are no pulverizing bodies, such as metal balls, in the pulverizing chamber 16 of this tooth. Only the inner wall of the comminution chamber 16 is provided with a lifting member 17, a irrigation member, a helically arranged lifting blade or the like for rotation and simultaneous transport of the material to be comminuted. Due to the rotation, the material to be pulverized is pulverized as it is in the pulverization chamber 16 with as little energy cost as possible, dismantled as it is, and separated 26,
The second pulverization chamber 18 is entered through the opening in the lifting wall. This second pulverizing chamber contains a pulverizing body 19 such as a metal ball.
These pulverizers pulverize the material to be pulverized to a product fineness, that is, to the fineness of finished cement. The material exiting the second pulverizing chamber is fed via conduit 20 to sieving machine 11 . The coarse part of this material (rough sawn) 21 is fed via a line 22 shown in dotted lines to a roll mill 12.13 and/or via a line 23 to a tube mill 10 where it is ground to a final fineness. Become. The cement pulverized to the final fine particle size becomes a sorted finished product 24 and leaves the sieving machine 11. In addition, at least a portion of the material 15 leaving the roll mill 12 and 13 contains lumps such as Schulpen, which is fed directly to the sieving machine 11 via the chain line 25, bypassing the tube mill 10. It is also possible. According to another feature of the invention, - an efficiency increase (product In order to increase the efficiency or reduce the specific energy consumption, a first pulverizing chamber without a pulverizing body can be provided afterwards on the inlet end of the tube mill, for example by flanging or by welding. If the material to be pulverized contains moisture or if the feathers need to be dried, another feature of the invention is to introduce a hot gas stream through the tube mill 10 and optionally through the pre-separator 11. At the same time, the material to be pulverized can be pulverized and dried.

[Brief explanation of the drawing]

The accompanying drawing is a schematic diagram of an embodiment of the device of the invention. In the figure, reference numeral 10.0 tube mill, 16, 1 B-a-fine grinding chamber, 1 floor... separation wall. Agent Hikaru Esaki Kodo Mitsufumi Ezaki

Claims (1)

[Scope of Claims] 1) A rotatable tube mill for pulverizing the pulverized material to a product fineness, such as brittle pulverized materials such as cement clinker, ore, coal or the like. A tube mill (10
) has at least two pulverizing chambers (16, 18), and among these pulverizing chambers, the first pulverizing chamber (16) as viewed in the flow direction of the material to be pulverized is used to store the material to be pulverized as it is. The pulverizing chamber (18) does not have a pulverizing body for the pulverization or disintegration of the material as it is for use in pulverization, and the pulverizing chamber (18) is used to process the material pretreated in the pulverizing chamber into products. A device characterized by having a pulverizing body such as a metal ball for finely pulverizing. 2) The inner wall of the first pulverization chamber (16) of the tube mill (10) rotates the material to be pulverized and at the same time transports the material to be pulverized by a lifting member (1), irrigation means or similar The device according to claim 1), comprising: 3) The apparatus according to claim 1) or 2), wherein a separation wall (17) having a passage port for use in pulverization is provided between the pulverization chambers (16, 18) of the tube mill [IO]. . 4) - If you have a house-shaped tube mill, or if you have removed the first separation wall to form a one-chamber tube mill due to remodeling, or if you have a two-chamber tube mill, you may need to change the tube mill to improve efficiency. There is a finely pulverized body on the end face on the inlet side]・
- The apparatus according to claim 1) or 2), wherein the pulverizing chamber is flanged or welded. 5) A sieve (11) is downstream connected to the tube mill (10), and the tube mill (IC) is used in a pulverizing device, in particular a packet-type rotary pulverizer with a sieve (11). The device according to any one of claims]) to 4), which is incorporated therein. 6) The tube mill (10) is pre-connected with a roll machine or roll mill (12, 13) that drives the entire length of the rolls at a high pressure of 2 tons/cm or more in order to increase product efficiency. The device according to any one of ranges 1) to 5). 'f) The circular orbit speed of the rolls of the roll mill (12, 13) is as slow as 1.5 m/s, especially 0.3 to 1 m/s.
．． 7. The device of claim 6, wherein the device is 2 meters.