JPH06297197A - Method and device for dry granulation - Google Patents

Abstract

PURPOSE:To improve yield through reducing rejection rate and to reduce equipment most by regulating an oversize particle with a crushing machine after granulating, subjecting to a vibration sieve again and regranulating an undersize particle by returning it to a roller type press machine. CONSTITUTION:After a raw material 4 is granulated by a roller type press machine 1, a final product is separated to an oversize and undersize particle other than the product. The oversize particle 5 is subjected to a vibration sieve 2 again as a regulated particle 7 with a vertical conveyer after regulated by a crushing machine 3. An undersize particle 6 is transferred by the vertical conveyer, returned to the roller type press machine and subjected to granulating again. Thus, the final product is produced through circulating processes. By this method, the equipment cost reduction through reduction of a treatment quantity of crushing machine as well as stabilized operation are made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry granulation method and apparatus using a roller press.

[0002]

2. Description of the Related Art Heretofore, several granulating methods for obtaining spherical particles have been known. As one of them, the raw material powder is put into a rotating rotary pan, and the powder is granulated while rolling the powder while adding a binder. According to this granulation method, a spherical granulated product can be obtained, but it is difficult to control the particle size and there is a problem in that the particle size varies. Moreover, controlling the water content is troublesome. Further, a spray granulation method is known as another granulation method for obtaining a spherical granulated product. In this granulation method, the raw material powder is dissolved in a liquid, a binder is further added, and then sprayed. By sending hot air to this, the liquid in the atomized material is instantly evaporated to obtain a spherical granulated product in which the powder left by the evaporation of the sprayed liquid is spherical. According to this granulation method, it is necessary to adjust the slurry and the apparatus becomes large. In addition to the above, various granulation methods such as a fluidized bed granulation method and a stirring granulation method are known, but it is difficult to obtain sized spherical particles.

Instead of these granulation methods, there is a granulation method using a roller press. FIG. 2 shows a granulating apparatus using the conventional roller type press. That is, FIG. 2 is a schematic view showing a dry granulation apparatus using a conventional roller press. As shown in FIG. 2, after the raw material 4 is granulated by the roller press 1, the whole amount is crushed by the crusher 3, and the crushed whole amount of the granulated product is the target granulated product by the vibrating sieve 2. After that, the over product 5 is sized by the crusher 3 and then re-granulated on the vibrating screen 2, while the under product 6 is conveyed to the roller press 1 by the vertical conveyor and re-granulated. Is the actual situation.

[0004]

As described above, in order to pass the whole amount of the granulated product through the crusher, the granulated product of the target size obtained by the roller type press machine is also crushed and crushed. This is one of the causes of the decrease in product yield. For this reason, as for the yield reduction, it is necessary to increase the equipment capacity of the roller type press and the crusher, which causes a problem in cost.

[0005]

[Means for Solving the Problems] As a result of intensive development, the inventors of the present invention should solve the above-mentioned problems. As a result, an object of the present invention is to improve the sizing efficiency by combining a crusher and a vibrating screen. To do. The gist of the invention is (1) in a dry granulation method using a roller press, after granulating with a roller press, separating the product and over- and under-products other than the product with a vibrating screen, The over-sized product is sized with a crusher, and then re-screened on a vibrating screen.
The undergranulated product is returned to the roller type press machine to be re-granulated for dry granulation.

(2) In a dry granulation apparatus using a roller press machine, a roller press machine for granulation is provided with a vibrating sieve for separating a product after granulation and an over-product and an under-product other than the product. The dry granulation apparatus is characterized in that a crusher for sizing and the under-product are returned to the roller type press machine again, and a conveying device for re-granulating is arranged.

[0007]

The present invention will be described in detail below with reference to the drawings according to the embodiments. FIG. 1 is a schematic view of a dry granulation apparatus using a roller press according to the present invention. As shown in FIG. 1, a raw material 4 is granulated by a roller press 1 and then separated by a vibrating screen 2 into a final product and an over or under product other than the product. The oversized product 5 is sized by the crusher 3 and then sized by the vertical conveyor as the sized product 7 again by the vibrating sieve 2.
Hang on. On the other hand, the under product 6 is also conveyed by the vertical conveyor, returned to the roller type press machine, and granulated again. The final product is obtained through such a circulation process.

To achieve such a method, FIG.
It is necessary to install the device shown in. That is, the vibrating sieve 2 for separating the granulated body after granulation is arranged directly below the roller type press machine for granulating unlike the conventional one, and the vibrating screen 2 is provided.
First, the product and the over-product and the under-product other than the product are separated. Then, the over-processed product is conveyed to the crushing machine 3 for sizing, while the under-processed product is returned to the roller-pressing machine again and is dried by the roller-pressing machine provided with the transfer device 6 for re-granulating. It is composed of a grain device.

With this structure, the whole amount of the granules granulated by the roller press is not passed through the crusher, and the granulated product of the target size obtained by the roller press is not crushed and crushed, The final product that is the granulated product granulated by the roller press can be directly sorted by the vibrating sieve to obtain the product, and the over and under products that have not become the final product of the target size are The product yield can be improved by re-granulating with the crusher and the press again.

By carrying out the present invention in this way, as shown in Table 1 in comparison with the conventional method, the throughput of the disintegrator is reduced to about 1/2 of that of the conventional method. In addition, the crusher can be downsized by half the processing amount, the cost can be reduced in terms of equipment, and the product rate is about 1.8 times higher than the conventional method. Was completed.

Table 1 ┌─┬──────┬───┬─────┬─────────┐ │ │ item │ conventional method │ invention │ remark │ ├ ─┼──────┼───┼─────┼─────────┤ │1│Crusher throughput │ 1 │ Approx. 1/2 times │ Equipment small, cost reduction │ ├─┼──────┼───┼─────┼─────────┤ │2│Production rate │ 1 │ 1.8 times │ │ └─┴─ ─────┴───┴─────┴─────────┘

[0012]

As described above, according to the present invention, it is possible to achieve the extremely excellent effects such as the reduction of the processing amount of the crusher and the reduction of the facility cost and the stable operation as compared with the conventional case. is there.

[Brief description of drawings]

FIG. 1 is a schematic view of a dry granulation device using a roller press according to the present invention,

FIG. 2 is a schematic view showing a dry granulation device using a conventional roller press.

[Explanation of symbols]

1 Roller Press 2 Vibrating Sieve 3 Crusher 4 Raw Material 5 Over Product 6 Under Product 7 Granulated Product Patent Applicant Shin Nippon Steel Co., Ltd. 1 Other Agent Attorney Attorney Shiina Yo

Claims (2)

[Claims] 1. In a dry granulation method using a roller press, after granulating with a roller press, the product is separated into an over product and an under product other than the product by a vibrating screen, and the over product is crushed by a crusher. The dry granulation method is characterized in that the granules are sized and again sieved, and the under-product is returned to the roller type press machine for granulation again. 2. A dry granulation apparatus using a roller press, wherein a roller press for granulating is provided with a vibrating sieve for separating the product after granulation and an over-product and an under-product other than the product, and the over-product is adjusted. A dry granulation apparatus, characterized in that a crusher for granules and the under-product are returned to a roller press machine again, and a conveying device for granulating again is arranged.