SU1235954A1 - Drum mixer-pelletizer of sinter burden - Google Patents

Description

one

The invention relates to agglomeration, in particular to the mechanical equipment of agglomeration plants.

The purpose of the invention is to improve the quality of the agglomerate by reducing the upper limit of the charge size.

The drawing shows a drum mixer-pelletizer sintering mixture.

The device includes a drive drum 1 (drive not shown), a shredder made in the form of a flexible link 2 suspended inside the drum along its length and placed with an adjustable gap 3 between them and the inner surface of the drum 1 of two groups 4 and 5 of grinding bodies 6, located in areas of 1/4-G / 3 drum length and starting from the ends of its loading 7 and unloading 8 parts.

The device works as follows.

During the rotation of the drum 1, the large granules of the charge 9, rolling down, cause the grinding bodies 6 to oscillate 6. The latter move along a complex trajectory. The ingress of the grinding bodies 6 into the ion, coarse granules of the charge 9 are subjected to impact from the latter and are destroyed.

. An adjustable gap 3 between the grinding bodies 6 and the inner wall of the drum I protects the granules from destruction of a given optimal size.

Under identical conditions of the sinter plant, a comparative analysis of the properties of the charge obtained in the proposed mixer-pelletizer and in the known device, as well as the properties of the agglomerate sintered from these charges, was carried out.

The composition of the mixture, wt.%:

Concentrate. 44

Agloruda3

Mp-ore2

Known to +

+ dolomite 10

Lime2

 Fuel4

Return35

In the drum pelletizer there are two groups of grinding bodies with an adjustable gap between them and the inner surface of the drum, starting: from the ends of the loading and unloading 359542

parts. The installation of the first group of grinding bodies in the area of the loading part is caused by the fact that primary granules of large size fall into the drum, which worsen the process of crumpling of the charge. The entrance to the zone of action of the small bodies, large granules are destroyed, which leads to the alignment of the particle size distribution jQ of the initial mixture.

As the charge is pelleted, along with granules of optimal size, large granules re-form (especially in violation of the regime (J moistening), which are destroyed by the second group of grinding bodies.

During the experiment, the distances at which the grinding bodies were suspended varied from. 0.5 m to 3.0 m from 2Q of the ends of the loading and unloading parts, The results of the experiment are introduced in Table 1. From the latter it can be seen that the minimum amount of the fraction + 10 mm is contained in the pelletized 25 charge obtained when the grinding bodies are placed at a distance of 2.0-2.5 m from the ends of the loading and unloading parts, which corresponds to 1/4 - 1/3 the length of the drum-pelletizer 2, m. A further increase in this distance does not lead to a significant decrease in the content of the fraction + 10 mm in the pelletized mixture. The gap between the melus 1m bodies and the inner surface of the drum is 10 mm.

V. drum, converted into a known device, okomkovana identical charge. Comparative analysis of the granulated composition of the pelletized mixture In the proposed and known devices are given in table 2. From the latter it is clear that the proposed device provides a more optimal particle size distribution of the pelletized mixture. Decreases from 0 to 3 mm fraction, which leads to stabilization of the composition of the charge, and an increase in its gas permeability.

0 A comparative analysis of the properties of the sinter, obtained from the mixture, pelletized in the proposed drum mixer .-- pelletizer and prototype.

5 The results of sintering are given in table 3. The results show that the highest technical and economic indicators of semi30

40

five

when sintering sinter from the charge, pelletized, in the proposed drum mixer-pelletizer.

From Table 3 it follows that the proposed numerical values of the inventive parameters of the invention provide a sufficient positive effect. The productivity increases by 1.25%, the content of the 0-5 mm fraction in the agglomerate has decreased by 1.0% abs.

The treatment of the charge in the proposed device makes it possible to reduce the amount of large pellets of the pelletized charge in comparison with the currently operating drum-pelleters, without increasing the content of the fraction of 0-3 mm in it. Without additional processing, the fuel rolled into large granules does not have time to react during sintering, the thermal and technical condition of carbon burning is violated. As a result, large granules are burned only with flue gases, and their core is a raw Gaicht, during unloading they are destroyed and significantly increase the content of fines in the agglomerate. The release of the sintered charge from large granules leads to an improvement in the quality of the agglomerate.

Compared to the mixture obtained in the known device, the mixture obtained in the proposed device contains a minimum amount of 0-3 mm fraction, has a more stable composition, which leads to an increase in its gas permeability. As a result, Spekani speed increases, which provides an increase in the productivity of the sinter plant.

The expected economic effect is obtained by increasing the productivity of sintering machines by 1.25 liters, and reducing the fines of the 0-5 mm fraction in the agglomerate by 1%.

Table 1

Predlozheniy 12.8

Prototype 13.3 Existing

13.5

6.212.4 16.3 25.3 31.7 8.1

6.315.2 14.1 21.4 30.6 9.0

9.0 16.5 13.5 23.2 31.4 9.1

Compiled by A.Sidorenko Eddsf I.Kossey Tehred V.KadarKorrektor M.Maksimishinets

3064/25

Circulation 567Subscribe

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Table 3

Claims (1)

A DRUM MIXER-SPRAYER of Agglomeration Batch, comprising a drive drum with a chopper suspended along a flexible connection, load and unload batch assemblies, characterized in that, in order to improve the quality of the sinter by reducing the upper limit of the size of the charge, the chopper is made in two groups grinding bodies placed with an adjustable gap between them and the inner surface of the drum 'and located respectively in sections from the ends of the loading and unloading parts of the drum, equal to 1 / 4-1 / 3 drum lengths. J u 00 joint venture SB SP 4*