FI66642B - FOERFARANDE FOER EFFEKTIVERING AV BRIKETTERING - Google Patents

Description

66642

This invention relates to a method for enhancing briquetting by coating members in contact with a moist feed material of a briquetting machine, such as rollers, with a solid elastic medium. The invention relates in particular to improving the wear resistance of briquettes produced in a briquetting machine and at the same time preventing the wear of the briquetting members of the briquetting machine. When processing ground melting furnace feed material for further metallurgical processing.

In a briquetting machine, briquetting members, such as roller cups, are subjected to intense abrasive wear, resulting in a short effective service life. Adhesion of the feed material also reduces the strength of the resulting briquettes and increases the proportion of fine unbroken material in the feeder.

The object of the present invention is to obviate the disadvantages of the prior art and to provide an even better method for carrying out briquetting. The essential features of the invention appear from the appended claim 1.

According to the invention, the elastic medium is fed onto the bodies, such as rollers, which come into contact with the moist feed material of the briquetting machine from the gaps between them and the edges of the hopper. The feed material presses the medium against the roller and the medium follows the roller at its speed due to the preferred method of feeding the medium. The medium is fed to each member separately, preferably using a mounted roller. As the feed material to be briquetted fills the cup more and more, the elastic medium also protrudes deeper and deeper into the bottom of the cup. With a suitable elastic medium, the cup is protected from abrasive wear of the feed material and the finished briquette becomes compact on its surface due to the elastic medium adhering to it.

The briquette produced by the method according to the invention obtains a dense outer shell of elastic medium, which also keeps the briquettes made of difficult-to-briquette materials of indeterminate grain size well together at different stages of processing. The medium-coated briquette is obtained from the briquetting machine more safely in storage and the amount of unbroken, fine material is reduced. Similarly, the adhesion of the briquettes to each other during storage is reduced. The medium also prevents abrasion when transporting briquettes from the storage silo to the melting furnace.

By using the method according to the invention, in addition to improving the handling of the briquettes, the service life of the rollers of the briquetting machine can be extended and made more efficient. When the medium is used, the wear of the rollers is greatly reduced while the adhesion of the feed material to the cups is prevented. Prevention of sticking also results in an increase in the strength of the dried briquettes, as the feed material to be briquetted may be wetter than normal briquetting. Wetter feedstock, in turn, results in savings in binder costs. Thus, with the method according to the invention, the briquetting costs are considerably reduced, while the briquetting itself produces even better and stronger briquettes, also from briquettes made from raw materials from which it is difficult to form a briquette by a conventional briquetting method.

In the method according to the invention, crepe-like, elastic paper and porous paper can be used as the medium, which in the drying step is highly permeable to volatile water and has a good adhesion to the surface of the briquette. Depending on the quality of the briquettes, fabric, plastic, foil, even a thin metal strip or other similar suitable solid can be used as the medium.

The invention will now be described in more detail with reference to the accompanying drawing, in which Figure 1 shows a sectional side view of a preferred embodiment of the invention using rolls in a briquetting machine and the medium being paper.

According to Figure 1, when the material to be briquetted is ground melting furnace feed for metallurgical further processing, the medium 1 is fed from the roll 2 into the gap 5 between the hopper 3 and the briquetting rollers 4. The moist feed material 6 pressed As the feed material 6 fills the roller cup 7 more and more, the medium 1 also protrudes deeper and deeper into the bottom of the roller cup 7. In connection with briquetting, when the finished briquette 8 is formed, the medium 1 adheres to the surface of the briquette and provides a tight, wear-resistant outer surface. The briquette 8 is further conveyed from the briquetting machine by means of a belt conveyor 9.

Although the use of an elastic medium to enhance briquetting in a roller briquetting machine is disclosed herein, the method of the invention is also applicable to other types of continuous or non-continuous briquetting machines.

Claims (7)

3,66642 A method for enhancing briquetting, characterized in that the members (7) which come into contact with the moist feed material (6) of the briquetting machine are protected by a medium (1), while at the same time coating the finished briquettes with said medium (1). Method according to Claim 1, characterized in that the medium (1) is paper. Method according to Claim 1, characterized in that the medium (1) is made of fabric. Method according to Claim 1, characterized in that the medium (1) is made of plastic. Method according to Claim 1, characterized in that the medium (1) is metal. Method according to one of the preceding claims, characterized in that the briquettable material (6) to be fed to the members (7) to be protected by the medium (1) is a ground melting furnace feedstock for further metallurgical processing. Method according to one of the preceding claims, characterized in that the members (7) to be protected by the medium (1) are roller cups.