SU554881A1 - Device for granulating materials - Google Patents

Description

one

The invention relates to the production of granular mineral fertilizers in drum-type apparatuses and can be used in any other field of the chemical industry that uses the 5 method of granulation in these apparatuses.

Drum type granulators are known, consisting of a steel drum, a chute for feeding curd materials, a steam distributor introduced under the material layer, a melt or mortar distributor onto the material surface and a retaining ring to maintain a certain height of the granule layer at the drum exit, J5

A device for granulating materials is known, comprising a rotating drum with a paddle nozzle and a back screw, a loading chamber with a nozzle for introducing pulp and inlet nozzles 20

powdered material and heat carrier and discharge chamber.

A disadvantage of the known device is to obtain a product of non-uniform particle size distribution with a high content.

holding the fines that results

to performance degradation at the ready

product.

The aim of the invention is to increase the productivity and uniformity of the particle size distribution of the product.

This is achieved in that the device comprises a cylinder with tangential slotted windows located in the loading chamber coaxially with the drum.

The drawing shows the proposed device.

It consists of a rotating drum paddle nozzle 2, a return screw 3, cylinder 4, loading chamber 5 with nozzles 6 and 7 for introducing heat transfer fluid and powder, gas distribution chamber 8, spreading nozzle 9, gas duct 1O for exhaust heat transfer fluid and diverting 11 for unloading the product from discharge camera 12. Pipe 7 is introduced into the cylinder 4.

The device works as follows. The pulp through the nozzle 9 is sprayed onto the core of the vortex curtain created in the cylinder 4 due to the tangential entry of the heat and powder. Then the pulp mixture to the powder falls on the curtain created by the paddle nozzle 2 located in the rotating drum 1. The resulting agglomerates are rolled and dried in a drum. After that, part of the material is returned by the return screw 3 to the loaast nozzle 2 to create a curtain. The remaining product flows through the chute 11 into the sieving, after which the fine fraction Q returns to the cylinder 4. The drying agent passes through the cylinder 4 and the concentration drum 1 leaves through the gas duct YU.

The contact of the sawn pulp with a vigorous flow of heat-transfer agent and powder leads to an increase in the size of small particles concentrated in the central part of the vortex flow, which leads to a decrease in the content of the fine fraction

in the product and increase the homogeneity of the particle size distribution of the product.

Claims (1)

Invention Formula A device for granulating materials, containing a rotating drum with a paddle nozzle and a screw auger, a loading chamber with a nozzle for introducing pulp and nozzles for introducing powdered material and a heat carrier and an unloading chamber, characterized in that, in order to improve the performance and uniformity of the particle size distribution of the product, it contains cylinder with tach potential openings, located in the loading chamber coaxially with the drum.