SU1194901A1 - Cup pelletizer - Google Patents

Abstract

CAPE BREAKER, containing a body connected to the rotational drive, a loading device, installed in the upper part of the body a curvilinear knife mainly in the form of a cycloid with protrusions and depressions, different in that of the NTO, with the aim of increasing the efficiency of the pelletizing process by compulsory formation of embryo granules, it is equipped with an additional a knife mounted radially in the opposite half relative to the ordinate axis of the bottom of the bowl at an angle of 30-75 relative to the specified axis, and the projections and depressions are made and adjacent to the bottom of the bowl edge of a curved knife. about 4i: about

Description

one

The invention relates to pelletizing of bulk materials and can be used in the mining industry, metallurgy, fertilizer production.

The aim of the invention is to increase the efficiency of the pelletizing process by forcing the formation of nucleated granules.

FIG. 1 shows a bowl pelletizer, a general view} in FIG. 2 pelletizer; in fig. 3 - knife profile.

The bowl pelletizer contains a bowl 1, a loading device 2, a fixed frame 3 with a comb 4 fixed on it, mounted in the upper left part of the bowl 1 in the indicated direction of rotation, and a cleaning knife 5 for the bottom of the bowl 1 fixed by a radial angle at an angle of 30 7 B to the vertical and 3-15 to the plane of the bottom of the bowl. In this case, the gap between the edge of the cleaning knife 5 and the bottom of the bowl 1 is 2-3 mm, and the gap between the edge of the curved knife 4 and the bottom is 5-10 mm, respectively.

On the edge 6 of the curvilinear knife 4 along its entire length there are alternating protrusions 7 and depressions (in the general case of a curvilinear shape). The width of the depressions in their lower part (along the edge 6) is 0.5-0.8 d at the same depth (or height of the protrusions 7), where d is the minimum diameter of conditional rocks.

Pelletizer works as follows.

The source material enters the boot device. 2. When rotating the bowl 1 with a circular frequency W, the material is pressed by the centrifugal force to the side of the bowl 1 and rises until it comes in contact with the knife 4, where it is divided into two streams moving along curvilinear trajectories and encountered in the opposite half of the pelletizer. When this occurs, the intensive growth of granules due to frequent collisions of particles and their mixing.

The layer of material adjacent to the bottom 1, meeting with the lower edge of the curvilinear knife, is divided by protrusions 7 into strips 9, the cross section of which is formed by the profile of the troughs. Then strips

4901

the material is moved together with a layer of crust to the circumference before meeting the cleaning knife 5. A knife blade 5 strips are cut from the crust and

5, under the action of its own weight and centrifugal forces, is broken into aggregates that are close in size to the conditioned granules. The resulting particles (lumps) of the material roll

10 downwards, at the same time compacted, initially tangential to the circles 9, and then, deviating to the side of the bowl, a nucleus of granules is formed. And the largest, i.e. similar in size to conforming, deviate more strongly to the side of bowl 1 and. get under the flow of the source material from the boot device 2. Rolling a layer of fresh material on themselves, they quickly reach standard sizes. Smaller embryos move practically along vertical trajectories and fall into the region where the material flows meet, separated by a curvilinear knife 4. In this zone, due to intensive mixing and high speeds of colliding material particles, the embryo growth is most efficient.

JQ After reaching the specified dimensions, the finished containers are unloaded through the side of the bowl 1 under the action of centrifugal forces.

For more intensive growth of the embryos and the speedy achievement by them of conforming sizes, the strips of material 9 must be re-moistened with respect to the starting material. For this purpose, from the non-working side

Q curved knife 4 is installed one or more nozzles 8 so that they do not interfere with the movement of material flows. With the help of nozzles 8, water 9 is applied to the newly formed glossy 9, which contributes to their preservation until they meet the edge of the cleaning knife 5. The amount of overwetting depends on the size of the pellets and a number of other

GD factors.

The specified sizes of protrusions and valleys are the most optimal. With smaller valleys (0.5 d), the strip breaks after cutting with knife 5 under the action of its own weight occurs in such a way that the resulting pieces have an elongated cylindrical shape. . then it breaks and as a result, it gradually reaches standard sizes. At large sizes (0.8 d, the destruction of the strips takes place with the appearance of lumps of irregular shape and various sizes. At the specified sizes, the strips break down approximately equally, into lumps close in shape to cylindrical with approximately equal diameter and height, which are well spun and become spherical The knife 5, in addition to maintaining a constant thickness of the layer of skull on the bottom of the bowl 1, plays an important role in the formation of the embryo, therefore, its usual installation places along the horizontal axis of the bowl 1 are unsatisfactory. In this case, after cutting the strips 9, the spacing of the enveloping for them is very small and, moreover, unequal for the strips close to the board and distant from the board. The cleaning knife 5 works most effectively when it is installed at an angle of 30-75, the maximum uniformity of the granule 40-50. With such an installation of the knife 5, the length of the pelletizing path has a close value across the entire width of the formation of the strips 9. The comparison of this pelletizer with the known one was carried out using a laboratory setup. The diameter of the bowl is 500 mm, the height of the bead is 100 mm, and the speed is 4U-60 rev / min. Okomkovanik, was subjected to iron ore concentrate with an iron content of 64.2% with a moisture content of 9-9.5%. The pelletizing time in the known device is 12 minutes, in the estimated 7-10 minutes. Loading is periodic. The averaged data of the experiments are given in table. 1. The dynamic strength of the rocks was defined as the number of drops of raw rocks of 10 mm to destruction from a height of 450 mm on the equal smooth surface of the slab. To determine the installation site of the cleaning knife, pelletizing was carried out for 10 min at a constant humidity for different values of the angles of inclination. The data of this series of experiments are given in table. 2. Based on the above data, it can be seen that the knife works satisfactorily in the range of 30-75. From tab. 1, it can be seen that the pelletizer offered allows to achieve higher rates with a significant reduction in the pelletizing time. Consequently, the use of this construction makes it possible to increase the productivity of the bowl pelletizer, to increase the yield of the conditioned class with obtaining a good structure of octaney. Table 1

90.1 89.5 92.1 96.0

0.48

1.2 0.73 2.0 0.74 2.2 0.74 2.3

Clearing angle

Knife number, degree of experience

O 15 30 45 60 75

1 2 3 4 5 6 7 8. 80 90

table 2

Output of condition class,%

89.9 91.0 92.2 94.3 95.6 95.2 89.5 83.1

Claims (1)

A CUP DIPPER containing a housing connected to a rotation drive, a loading device, a curved knife mounted in the upper part of the housing, mainly in the form of a cycloid with protrusions and depressions, characterized in that, in order to increase the efficiency of the pelletizing process by forcing the formation of granule nuclei, it equipped with an additional knife mounted radially in the opposite half relative to the ordinate axis of the bottom of the bowl at an angle of 30-75 * relative to the specified axis, and the protrusions and depressions are made on the edge of the curved knife adjacent to the bottom of the bowl.